20221135 Ver 1_More Info Received_20221123

Staff Review Form
NORTH CAROLINA
Envlronm¢ntcl Qvofiry
Updated September 4, 2020
Staff Review
Does this application have all the attachments needed to accept it into the review process?*
Yes No
ID# *
20221135
Version* 1
Is this project a public transportation project?*
Yes
• No
Reviewer List: * Sue Homewood:eads\slhomewood
Select Reviewing Office: *
Winston-Salem Regional Office - [phone]
Does this project require a request for payment to be sent?*
Yes
No

Project Submittal Form
*
Please note: fields marked with a red asterisk below are required. You will not be able to submit the form until all
mandatory questions are answered.
Project Type: *
For the Record Only (Courtesy Copy)
New Project
Modification/New Project with Existing ID
More Information Response
Other Agency Comments
Pre -Application Submittal
Re-Issuance\Renewal Request
Stream or Buffer Appeal
Pre -Filing Meeting Date Request was submitted on:
4/28/2022
Is this supplemental information that needs to be sent to the Corps?*
Yes No
Project Contact Information
Name:
Heather LaGamba
Who is submitting the information?
Email Address: [e-mail]
Project Information
Existing ID #:
20221135
20170001 (no dashes)
Project Name: Tri-West Business Park
Is this a public transportation project?
Yes
No
Existing Version:
1
Is the project located within a NC DCM Area of Environmental Concern (AEC)?
Yes No Unknown
County (ies)
Davie
Please upload all files that need to be submited.
Click the upload button or drag and drop files here to attach document
5917.3 - TriWest Additional Info
Response_11.23.22.pdf
TriWest Business Center Stormwater Report
2022.11.02.pdf
Only pdf or kmz files are accepted.
2.84MB
7.34MB

Describe the attachments or
comments:
Response to 20221135 More Info Request.
Sign and Submit
By checking the box and signing box below, I certify that:
• I, the project proponent, hereby certifies that all information contained herein is true, accurate, and complete to the
best of my knowledge and belief.
• I, the project proponent, hereby requests that the certifying authority review and take action on this CWA 401
certification request within the applicable reasonable period of time.
• I agree that submission of this online form is a "transaction" subject to Chapter 66, Article 40 of the NC General
Statutes (the "Uniform Electronic Transactions Act");
• I agree to conduct this transaction by electronic means pursuant to Chapter 66, Article 40 of the NC General
Statutes (the "Uniform Electronic Transactions Act");
• I understand that an electronic signature has the same legal effect and can be enforced in the same way as a
written signature; AND
• I intend to electronically sign and submit the online form.
Signature:
j27:ear 00. 04aaiarrfrs
Submittal Date: 11/23/2022
Is filled in automatically.

P I LGT
P I L O T G E O L 0 G 1 C A L, P L L C
November 18, 2022
Ms. Sue Homewood
Division of Water Resources, Winston-Salem Regional Office
Department of Environmental Quality
Reference: Request for Additional Information
TriWest Business Park
US Highway 158
Mocksville, Davie County, North Carolina
DWR 401 Project #20221135/SAW-2020-01262
Pilot Project 5917.3
Dear Ms. Homewood:
Pilot Environmental Inc. ("Pilot") has prepared this response on behalf of Mocksville
Development Partners, LLC to address a Request for Additional Information from the NCDEQ
dated October 3, 2022 (attached). The information requested and our responses/comments are
included below.
1, Please provide mar: devils regarding avoidan_-c Dnd-iinimiiation of impacts for this protect.
Pl a aye -.la rift' if the build rag} h ave been designed for specifiz er.d users c• are speculative to
n;9-,ir-m_ I- app-mars thar resi?irg and/or rades gn of nnF. hii; Iding has the patentiaIto signifiran- y
reduce impacts for this project_ Tease redesign th3 project to turther avoid and minimize the
impacts or prrav de xperitic cetailed informa-ion re CardinE c.ser reruirements/s nine criteria,
liar<ing let xize criteria, truck parkin g sizin-f j n d readhvay neecs ro c early document avoidance
and mir Iml nation For ine current des gn.
Response — the main building referenced above has been designed for a user. The user of
the main building will require a 1,200,000 square foot distribution and manufacturing
facility. The facility will contain storage/manufacturing areas and office areas, restrooms
and employee break areas, trailer docks, storage parking, employee parking and landscaped
areas. Additionally, the user will require minimally obstructed circular flow that does not
comingle foot traffic with tractor trailer traffic. A circular flow is also necessary for
operational efficiencies of the occupant and for safety purposes of emergency personnel
services. The site has been designed for a user that anticipates up to approximately 200
tractor trailer trips per day and approximately 600 vehicular trips per day for employee and
visitors. The proposed facility is anticipated to operate three shifts that allow 24-hour per
day operations. Necessary trailer docks, trailer storage, distance between docks and trailer
storage (i.e. cross dock configuration), vehicular parking areas and general vehicular and
tractor trailer flow pattern has been designed based upon the user's anticipated
requirements and general safety.
PO Box 128, Kernersville, NC 27285
www.pilotenvir(.com

Request for Additional Information
November 18, 2022
It should be noted that a larger building and parking and access infrastructure are preferred
for growth and flexibility but has been reduced to its current size in order to avoid impacts
to the wetland located further north. While an alternatives analysis has not been completed
in conjunction with this request, it is widely known in the market that there are no other
properties located within the piedmont of North Carolina that can accommodate a facility
of this size or at least not without far greater impacts to streams and wetlands. Additionally,
the site is located adjacent to Interstate 40 and situated strategically between major
commerce destinations.
Due to the size and shape of the property and locations of other streams and wetlands, the
proposed building orientation is the only logical layout of the building and surrounding
infrastructure on the site. Other orientations of the building would impact far more streams
and wetlands. A reduced building length would not further decrease the amount of stream
and wetland impacts. A reduced building width would minimally reduce the amount of
impact and not meet user requirements. It should also be noted that the southwestern
wetland proposed for impact is of low quality and cultivated annually and that the applicant
has proposed to provide mitigation for impacts to the wetland at a 2:1 ratio despite its low
quality. Due to its proximity to the highway and the minimal amount of impact required to
construct a facility of this size, the proposed site has been identified as a viable option for
the proposed project.
7. Notwithstardin m the answer to iter- #7; please provide more deta i ed des gn informs- cn so that
the D vision may evak ate additional potential -maker cuality i -.iparts. Multi -le areas w thin the
pruj2U sho-ovthelit rills of bui dings, ruadways" and sLOrrrrWa-.er cun.-u rneasLjres irnrnedia:ely
adjacent to -rebo.indarles of JurlAlctlor�al features. itappearsthat thti plies prov ded with the
anpliration may not he detailed erough to account for any potertial additional impacts for Fi I
slopes, t-2mporary constriction acr-Dss and/ar temporary erasion control measures_
Response —There are no additional impacts for fill slopes, temporary construction access or
temporary erosion control measures. Please refer to the attached EX 1 - TriWest Business
Park —Stream and Wetland Impact Exhibit.

Request for Additional Information
November 18, 2022
3. The application states that the proJact Is 3uNcct to a oval Government post construction water
quality stormwater review, however according to the Div ision of Energy, MlineraI a nd Land
Resources webs Ito, thL project Is Iocctad outs de of ny vocal government IurlsdIct-cn foF wWtcr
quality stormwater re►'.ew. Therefore, .n order to ensure protection of Jow nAream water
quality, please provide a complete stormwater managcm, rt plan for review. Ple-asc ensure that
it includes all app-opriate suppfernental forms, U&M agreernenLf, cak ilattons, enffineerinff
dra%vInCs, etc., that complies with the req u I rern ents of the Surm Storm atcr Program. Th:c
Smrrnwater DesiEn M a nua I ar1d a ppiicable torms may ne faurid on the DEIv1LR's wuebsite at
https_i�'deq.nc., �r,'abou /diVi5iDnste-ier�V-mineral-land-resources/enern,-mineral-land-permit-
Riidance{stamiwa er-bmp-rr•..anaal. In addi L Qn, pease also subrnh. L h e application Farrn SWU-
10f (aLLarhed). Howevehe �505 application Fee and fast two signature pages of Lhis torrn may
be ornit Led.
Response — Please refer to the attached Stormwater Management Design Report for TriWest
Business Center prepared by Oak Engineering.
4. Pursuant to 15A NCAC 01H.0505,1 "a 401 Water Quality Ccrt f ca:lon may only be Issued upon
cieterrniningthatthe propcsLmd a;-tiv:ty will comply with state watrsr Iuaiity standards which
ine udes +des!�nated uses, numeric •-riteria, narrative criti!na and the state's ant ideoradation
policy, as defined in rules of 15A NCAC D2B .D200... In assessing whuiher the proposed activity
wit comply with waver quality standards. the DIN isian sha I evaluate if .hc proposed activity; (2)
viouI'd Cause or contribute to a violation Df water quality standards; (3] +mould result ,n secondary
ter iLumulaUwe impacts that caosu or rurAribute -Lu, or will cause a conLdtku Le to, a via{-ation of
venter quality nanda rds;" In order for the DI&[on :a fully evaluato petemVal hydrological Irnpacts
on sortie strewn and wetland features %within the project lin-,its, please provide the location of all
outlet structures from the SCN4s shown an the proposed plan sheet. In older to avoid 2urther
requests For add iLianal informa:ian upon receipt r)F L h e resposrse Lu L' is item, Lhe Division
strong.y P nco urage s that you tmn=fuIlly evaluate the p-apased s ite p an fo- Iacntinn_s where
existing s-urtace hyd-o ogywiII be redire--ted and would therefore have the potential to remove
cr reduce the cxIZngfunctIons of a s.rcam anoicr wetland, Based on the curFent aroused plan
the Dhrision be irves there is .iign ificant po`entia# far indirt+ct im nact ; to same features within tne-
everall project limits.
Response —The locations of stormwater ponds and outlet structures have been revised and
are shown on the revised Wetland and Stream Impact Exhibit (attached). In order to avoid
secondary impacts to streams and wetlands by removing/redirecting hydrology, a French
drain has been added to Stream SC, stormwater ponds have been placed upgradient of
several features and outlet structures repositioned to the heads of features. The French
drain will resupply hydrology back to the start of Stream SC and Wetland WD. Additionally,
Stream SC and Wetland WD are groundwater induced systems, meaning that the
groundwater surfaces in these areas providing hydrology to the stream and wetland. While
upgradient surface water may be redirected, there will be no dewatering or disturbance to
the groundwater table. As such, hydrology to Stream SC and Wetland WD will continue to
be supplied by the groundwater table. The stormwater pond outlets have been realigned to
discharge to the heads of features during storm events and will further aid in rehydrating
3

Request for Additional Information
November 18, 2022
downgradient streams and wetlands by capture and slow infiltration back into the
surrounding features. The stormwater ponds are located upgradient of the streams and
wetlands, and will recharge to these features in their entirety. Wetland WT discharges into
a grass lined ditch. Removal of hydrology from this area will have no impact on the quality
or function of the downgradient feature. Wetland WA and features located downgradient
of WA are not expected to be impacted as 40 percent of the drainage area will remain as
pervious surface. Additionally, over 40 percent of its drainage area will continue to
contribute to the hydrology of Wetland WA.
Closing
We appreciate your time and consideration of this matter. Please contact us at 336.310.4527 if
you have any questions concerning the proposed plan.
Sincerely,
David S. Brame, PWS
Michael T. Brame, PWS
Senior Project Manager
Principal
Attachments: NCDEQ-Request for Additional Information dated October 4, 2022
EX1 TriWest Business Park— Wetland and Stream Impact Exhibit
TriWest Business Center Stormwater Report (uploaded to online Project
Submittal Interim Form)
4

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
NORTH CAROLINA
Environmental Quality
October 3, 2022
DWR # 20221135
Davie County
Mocksville Development Partners, LLC
Attn: Mr. Daniel Barnes
PO Box 341
Dobson NC 27017
Delivered via email to: [e-mail]
Subject: REQUEST FOR ADDITIONAL INFORMATION
Tri-West Business Park
Dear Mr. Barnes:
On August 19, 2022, the Division of Water Resources (Division) received your application requesting a
401 Water Quality Certification from the Division for the subject project. The Division has determined
that your application is incomplete and cannot be processed. The application is on -hold until all of the
following information is received:
Please provide more details regarding avoidance and minimization of impacts for this project.
Please clarify if the buildings have been designed for specific end users or are speculative in
nature. It appears that resizing and/or redesign of one building has the potential to significantly
reduce impacts for this project. Please redesign the project to further avoid and minimize the
impacts or provide specific detailed information regarding user requirements/sizing criteria,
parking lot size criteria, truck parking sizing, and roadway needs to clearly document avoidance
and minimization for the current design.
Notwithstanding the answer to item #1, please provide more detailed design information so that
the Division may evaluate additional potential water quality impacts. Multiple areas within the
project show the limits of buildings, roadways, and stormwater control measures immediately
adjacent to the boundaries of jurisdictional features. It appears that the plans provided with the
application may not be detailed enough to account for any potential additional impacts for fill
slopes, temporary construction access and/or temporary erosion control measures.
3. The application states that the project is subject to a local government post construction water
quality stormwater review, however according to the Division of Energy, Mineral and Land
Resources website, this project is located outside of any local government jurisdiction for water
quality stormwater review. Therefore, in order to ensure protection of downstream water
quality, please provide a complete stormwater management plan for review. Please ensure that
it includes all appropriate supplemental forms, O&M agreements, calculations, engineering
drawings, etc., that complies with the requirements of the State Stormwater Program. The
D � ��� North Carolina Department of Environmental Quality I Division of Water Resources
Winston-Salem Regional Office 1 450 W. Hanes Mill Rd, Suite 300 1 Winston-Salem, North Carolina 27105
NOMlH naouNa 336.776.9800

Mocksville Development Partners, LLC
DWR# 20221135
Request for Additional Information
Page 2 of 3
Stormwater Design Manual and applicable forms may be found on the DEMLR's website at
https://deg.nc.gov/about/divisions/energy-mi neral-land-resources/energy-mi neral-land-permit-
guidance/stormwater-bmp-manual. In addition, please also submit the application form SWU-
101 (attached). However, the $505 application fee and last two signature pages of this form may
be omitted.
4. Pursuant to 15A NCAC 02H.0506(b) "a 401 Water Quality Certification may only be issued upon
determining that the proposed activity will comply with state water quality standards which
includes designated uses, numeric criteria, narrative criteria and the state's antidegradation
policy, as defined in rules of 15A NCAC 02B .0200... In assessing whether the proposed activity
will comply with water quality standards, the Division shall evaluate if the proposed activity: (2)
would cause or contribute to a violation of water quality standards; (3) would result in secondary
or cumulative impacts that cause or contribute to, or will cause or contribute to, a violation of
water quality standards;" In order for the Division to fully evaluate potential hydrological impacts
on some stream and wetland features within the project limits, please provide the location of all
outlet structures from the SCMs shown on the proposed plan sheet. In order to avoid further
requests for additional information upon receipt of the response to this item, the Division
strongly encourages that you carefully evaluate the proposed site plan for locations where
existing surface hydrology will be redirected and would therefore have the potential to remove
or reduce the existing functions of a stream and/or wetland. Based on the current proposed plan
the Division believes there is significant potential for indirect impacts to some features within the
overall project limits.
Pursuant to Title 15A NCAC 02H .0502(e), the applicant shall furnish all of the above requested
information for the proper consideration of the application. Please respond in writing within 30
calendar days of receipt of this letter by sending one (1) copy of all of the above requested information
to the 401 & Buffer Permitting Branch, 1617 Mail Service Center, Raleigh, NC 27699-1617 OR by
submitting all of the above requested information through this
link: https://edocs.deg.nc.gov/Forms/Supplemental-Information-Form (note the DWR# requested on
the link is referenced above).
If all of the requested information is not received within 30 calendar days of receipt of this letter, the
Division will be unable to approve the application and it will be denied as incomplete. The denial of this
project will necessitate reapplication to the Division for approval, including a complete application
package and the appropriate fee.
Please be aware that you have no authorization under the Section 401 of the Clean Water Act for this
activity and any work done within waters of the state may be a violation of North Carolina General
Statutes and Administrative Code.
North Carolina Department of Environmental Quality I Division of Water Resources
D � Winston-Salem Regional Office 1 450 W. Hanes Mill Rd, Suite 300 1 Raleigh, North Carolina 27105
NoalHCaao_wa 336.776.9800

Mocksville Development Partners, LLC
DWR# 20221135
Request for Additional Information
Page 3 of 3
Please contact me at 336-776-9693 or Sue. [e-mail] if you have any questions or
concerns.
Sincerely,
DocuSigned by:
Ho"Iewood
456ED631098F411...
Sue Homewood
Division of Water Resources, NCDEQ— WSRO
Electronic cc: David Brame, Pilot Environmental Inc.
Samantha Dailey, USACE Raleigh Regulatory Field Office
DWR 401 & Buffer Permitting Branch file
North Carolina Department of Environmental Quality I Division of Water Resources
D ��� Winston-Salem Regional Office 1 450 W. Hanes Mill Rd, Suite 300 1 Raleigh, North Carolina 27105
NOR1H CARou Na 336.776.9800

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OAK
E N G I N E E R I N G
STORMWATER MANAGEMENT
DESIGN REPORT
FOR
TRIWEST BUSINESS CENTER
;10
R
ff,
O2:'s EAL r
045345
10
,,,�' �.., g, •� 11/02/2022
DAVIE COUNTY, NORTH CAROLINA
OAK ENGINEERING
4929 MONROE RD
CHARLOTTE, NC 28205
NC FIRM LICENSE: P-1742

OAK
E N G I N E E R I N G
TABLE OF CONTENTS
I. NARRATIVE
INTRODUCTION
STORMWATER MANAGEMENT REQUIREMENTS
EXISTING SITE CONDITIONS
PROPOSED SITE CONDITIONS
PROPOSED BMP DESIGN
CONCLUSIONS
II. MAPS AND FIGURES
HYDROCAD MODEL ROUTING DIAGRAM
USGS LOCATION MAP
DRAINAGE AREA MAPS
DAVIE COUNTY RAINFALL DATA
SOILS MAP
FEMA FIRM MAP
III. HYDROCAD MODEL OUTPUT
HYDROCAD: 2YR-24HR STORM EVENT
HYDROCAD: 1 OYR-24HR STORM EVENT
HYDROCAD: 25YR-24HR STORM EVENT (PONDS ONLY)
HYDROCAD: 50YR-24HR STORM (PONDS ONLY)
HYDROCAD: 100YR-24HR STORM (PONDS ONLY)

OAK
E N G I N E E R I N G
INTRODUCTION
Mocksville Development Partners, LLC is proposing the construction of an industrial park in Davie County, North Carolina. The
proposed improvements will include four (4) industrial buildings totaling approximately 1,895,360-sf with trailer parking and
vehicular parking spaces. Davie County does not have any stormwater management requirements and the project is not in a
designated Phase II area. As such, six (6) dry ponds are proposed to provide stormwater detention for the site.
STORM WATER MANAGEMENT REQUIREMENTS
Davie County Storm water Management Requirements
1. None
Six (6) dry detention ponds were used to provide stormwater detention for the proposed improvements.
EXISTING SITE CONDITIONS
The 201.14 acre site is primarily used for agricultural uses. The site has three (3) distinct outfalls that will be studied for
pre/post detention.
Soils on the site vary but are predominantly Hydrologic Soil Group C soils.

OAK
E N G I N E E R I N G
See the Maps & Figures section of this report for Drainage Area and Soils Maps.
PROPOSED SITE CONDITIONS
As previously mentioned, the proposed improvements will include four (4) industrial buildings totaling approximately
1,895,360-sf with trailer parking and vehicular parking spaces. Three (3) outfalls will be studied for pre/post runoff
control.
PREDEVELOPMENT
SUMMARY A.
• (flows
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1 yr-24hr
1 30.23
43.88
10.46
2yr-24hr
47.44
67.67
16.42
10yr-24hr
101.03
140.95
34.97
25yr-24hr
136.02
188.46
47.08
50yr-24hr
165.22
227.99
57.19
100yr-24 h r
195.38
268.73
67.63
POST DEVELOPMENT A'(flows
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1 yr-24hr
18.62
7.46
3.15
2yr-24hr
27.36
13.80
4.37
10yr-24hr
55.99
56.40
9.64
25yr-24hr
92.50
93.03
24.25
50yr-24hr
114.09
1 130.87
1 35.56
100yr-24hr
156.87
1 176.49
1 44.16

OAK
E N G I N E E R I N G
MAPS & FIGURES
HYDROCAD MODEL ROUTING DIAGRAM
USGS LOCATION MAP
DRAINAGE AREA MAPS
DAVIE COUNTY RAINFALL DATA
SOILS MAP
FEMA FIRM MAP

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NOAA Atlas 14, Volume 2, Version 3,
Location name: Mocksville, North Carolina, USA"
Latitude: 35.9565°, Longitude:-80.5232°
Elevation: 719.2 ft""
*source: ESRI Maps
(D ** source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley
NOAA, National Weather Service, Silver Spring, Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1
Average recurrence interval (years)
1 2 5 10 25 50 100 200 500 1000
0.368 0.436 0.512 0.566 0.628 0.670 0.708 0.743 0.782 0.810
5-min
(0.340-0.400) (0.404-0.475) (0.473-0.557) (0.520-0.614) (0.574-0.682) (0.608-0.729) (0.639-0.772) (0.665-0.813) (0.690-0.860) (0.706-0.895)
0.588 0.698 0.820 0.905 1.00 1.07 1.13 1.18 1.24 1.27
10-min
(0.543-0.638) (0.645-0.759) (0.757-0.893) (0.831-0.983) (0.915-1.09) 1 (0.969-1.16) 11 (1.01-1.23) 1 (1.05-1.29) 1(1.09-1.36) (1.11-1.41)
0.735 0.877 1.04 1.14 1.27 F 1.42 1.49 1.56 1.60
15-min
(0.679-0.798) (0.811-0.954) (0.957-1.13) 1 (1.05-1.24) 11 (1.16-1.38) 1 (1.28-1.55) 1 (1.33-1.63) 11 (1.37-1.71) 1 (1.40-1.77)
1.01 1.21 1.47 1.66 1.88 2.03 2.18 2.31 2.48 2.59
30-min
(0.931-1.09) (1.12-1.32) (1.36-1.60) (1.52-1.80) (1.72-2.04) (1.85-2.21) (1.97-2.38) (2.07-2.53) (2.19-2.73) (2.26-2.87)
1.26 1.52 1.89 2.16 2.50 2.76 3.00 3.24 3.56 3.78
60-min
(1.16-1.36) (1.41-1.65) 11 (1.74-2.06) (1.98-2.35) (2.29-2.72) (2.50-3.00) (2.71-3.27) (2.90-3.55) (3.14-3.91) (3.30-4.18)
1.48 1.79 2.24 2.58 3.02 3.37 3.70 4.04 4.49 4.83
2-hr
(1.36-1.60) (1.65-1.95) 1 1 (2.37-2.80) (2.76-3.28) (3.05-3.66) (3.32-4.04) (3.59-4.42) (3.93-4.94) (4.17-5.34)
1.58 1.91 2.40 2.77 3.27 3.66 4.05 4.44 4.98 5.39
3-hr
(1.46-1.72) (1.77-2.09) (2.22-2.62) (2.55-3.02) (2.98-3.56) (3.31-3.98) (3.63-4.42) (3.94-4.86) (4.34-5.48) (4.63-5.96)
1.93 2.33 2.92 3.39 4.00 4.50 5.00 5.50 6.20 6.74
6-hr
(1.78-2.11) (2.15-2.55) (2.69-3.19) (3.10-3.69) (3.65-4.36) (4.06-4.89) (4.47-5.44) (4.87-6.00) (5.39-6.79) (5.78-7.41)
2.31 2.79 3.51 4.07 4.84 5.46 6.09 6.74 7.64 8.35
12-hr
(2.13-2.52) (2.57-3.06) (3.23-3.83) (3.73-4.44) (4.40-5.26) (4.91-5.92) (5.43-6.61) (5.94-7.32) (6.62-8.30) (7.11-9.08)
3)-
3.27
3.95
4.92
5.68
6.71
7.52
8.34
9.19
10.3
11.2
2-day
(3.04-3.52)
(3.67-4.25)
(4.58-5.30)
(5.27-6.11)
(6.20-7.21)
(6.93-8.09)
(7.67-8.98)
(8.41-9.90)
(9.42-11.2)
3.48
4.19
5.20
5.99
7.05
7.90
8.76
9.64
10.8
11.8
3-day
(3.25-3.74)
(3.91-4.50)
(4.84-5.59)
(5.57-6.43)
(6.53-7.58)
(7.30-8.49)
(8.06-9.42)
(8.84-10.4)
(9.89-11.7)
(10.7-12.8)
3.69
4.43
5.47
6.29
7.40
8.28
9.18
10.1
11.4
12.3
4-day
(3.45-3.96)
(4.14-4.76)
(5.11-5.88)
(5.87-6.75)
(6.87-7.94)
(7.66-8.89)
(8.46-9.87)
(9.27-10.9)
4.22
5.05
6.14
6.99
8.15
9.06
9.99
10.9
12.2
13.2
7-day
(3.96-4.52)
(4.73-5.40)
(5.75-6.57)
(6.54-7.48)
(7.60-8.72)
(8.43-9.70)
(9.26-10.7)
(10.1-11.7)
4.82
5.74
6.91
7.81
9.00
9.94
10.9
11.8
13.1
14.1
10-day
(4.55-5.14)
(5.42-6.11)
11 (6.51-7.35)
(7.34-8.30)
(8.45-9.57)
(9.31-10.6)
(10.2-11.6)
(11.0-12.6)
6.49
7.67
9.06
10.2
11.6
12.8
13.9
15.1
16.6
17.8
20-day
(6.15-6.86)
(7.26-8.10)
(8.57-9.58)
(9.59-10.7)
(10.9-12.3)
(12.0-13.5)
(13.0-14.7)
(14.1-16.0)
(15.4-17.7)
(16.5-19.0)
8.04
9.45
10.9
12.1
13.6
14.7
15.8
16.9
18.3
19.4
30-day
(7.66-8.44)
(9.01-9.92)
(10.4-11.5)
(11.5-12.7)
(12.9-14.2)
(13.9-15.4)
(14.9-16.6)
(15.9-17.8)
(17.2-19.3)
(18.2-20.5)
10.1
11.8
13.5
14.7
16.3
17.6
18.7
19.9
21.4
22.5
45-day
(9.69-10.6)
(11.3-12.4)
11 (12.9-14.1)
1 (14.1-15.4)
11 (15.6-17.1)
1 (17.8-19.6)
1 (18.9-20.8)
12.1
14.1
15.9
17.2
18.9
20.2
21.5
22.7
24.2
25.3
60-day
(11.6-12.6)
(13.5-14.7)
(15.2-16.5)
(16.5-17.9)
(18.1-19.7)
(19.3-21.1)
(20.5-22.4)j
I (24.0-26.6)
Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a
given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not
checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
Back to Top
PF graphical

NOAA Atlas 14, Volume 2, Version 3,
Location name: Mocksville, North Carolina, USA"
Latitude: 35.9565°, Longitude:-80.5232°
Elevation: 719.2 ft""
*source: ESRI Maps
(D ** source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley
NOAA, National Weather Service, Silver Spring, Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches/hour)1
Average recurrence interval (years)
1 2 5 10 25 50 100 200 500 1000
5-min
4.42
(4.08-4.80)
5.23
(4.85-5.70)
6.14
(5.68-6.68)
7.54
(6.89-8.18)
8.04
(7.30-8.75)
8.50
(7.67-9.26)
8.92
(7.98-9.76)
9.38
(8.28-10.3)
9.72
(8.47-10.7)
3.53
4.19
4.92
5.43
6.00
6.40
6.75
7.07
7.42
7.65
10-min
(3.26-3.83)
(3.87-4.55)
(4.54-5.36)
(4.99-5.90)
(5.49-6.52)
(5.81-6.96)
(6.09-7.36)
(6.32-7.73)
(6.55-8.17)
(6.67-8.46)
2.94
3.51
4.15
4.58
5.07
5.40
5.69
5.94
6.23
6.40
15-min
(2.72-3.19)
(3.24-3.82)
(3.83-4.52)
(4.21-4.97)
(4.64-5.51)
(4.91-5.88)
(5.13-6.20)
(5.32-6.50)
(5.50-6.85)
(5.58-7.08)
2.02
2.42
2.95
3.32
3.76
4.07
4.36
4.63
4.96
5.18
30-min
(1.86-2.19)
(2.24-2.64)
(2.72-3.21)
(3.05-3.60)
(3.44-4.08)
(3.70-4.43)
(3.93-4.75)
(4.14-5.06)
(4.37-5.45)
(4.52-5.73)
1.26
1.52
1.89
2.16
2.50
2.76
3.00
3.24
3.56
3.78
60-min
(1.16-1.36)
(1.41-1.65) 11
(1.74-2.06)
(1.98-2.35)
(2.29-2.72)
(2.50-3.00)
(2.71-3.27)
(2.90-3.55)
(3.14-3.91)
(3.30-4.18)
0.738
0.894
1.12
1.29
1.51
1.68
1.85
2.02
2.25
2.42
2-hr
(0.680-0.800)
(0.824-0.973)1
1 (1.18-1.40) 11
(1.38-1.64)
1 (1.52-1.83) 11
(1.66-2.02)
(1.80-2.21)
0.526
0.637
0.800
0.924
1.09
F 1.35
1.48
1.66
1.79
3-hr
(0.486-0.572)
(0.589-0.696)
(0.738-0.872)
1 (0.848-1.00) 11
(0.992-1.19)
(1.10-1.33)
(1.21-1.47)
(1.31-1.62)
(1.45-1.82)
0.322
0.389
0.488
0.565
0.669
0.751
0.834
0.919
1.04
1.13
6-hr
(0.297-0.352)
(0.360-0.425)
(0.450-0.533)
(0.518-0.615)
(0.609-0.727)
(0.679-0.817)
(0.746-0.908)
1 (0.813-1.00) 11
(0.900-1.13)
(0.965-1.24)
0.192
0.232
0.291
0.338
0.402
0.453
0.505
0.560
0.634
0.693
12-hr
(0.177-0.209)
(0.214-0.254)
(0.268-0.318)
(0.310-0.368)
(0.365-0.437)
(0.408-0.491)
(0.451-0.548)
(0.493-0.607)
(0.549-0.689)
(0.590-0.754)
0.117
0.141
0.178
0.207
0.246
0.277
0.310
0.343
0.389
0.425
24-hr
(0.109-0.126)
(0.131-0.153)
(0.165-0.192)
(0.191-0.223)
(0.227-0.266)
(0.255-0.300)
(0.284-0.335)
(0.313-0.371)
(0.353-0.421)
(0.384-0.461)
0.068
0.082
0.103
0.118
0.140
0.157
0.174
0.191
0.215
0.234
2-day
(0.063-0.073)
(0.076-0.089)
(0.095-0.110)
(0.110-0.127)
(0.129-0.150)
(0.144-0.168)
(0.160-0.187)
(0.175-0.206)
(0.196-0.233)
(0.213-0.253)
0.048
0.058
0.072
0.083
0.098
0.110
0.122
0.134
0.151
0.164
3-day
(0.045-0.052)
(0.054-0.063)
(0.067-0.078)
(0.077-0.089)
(0.091-0.105)
(0.101-0.118)
(0.112-0.131)
(0.123-0.144)
(0.137-0.163)
(0.149-0.177)
0.038
0.046
0.057
0.066
0.077
0.086
0.096
0.105
0.118
0.129
4-day
(0.036-0.041)
(0.043-0.050)
(0.053-0.061)
(0.061-0.070)
(0.072-0.083)
(0.080-0.093)
(0.088-0.103)
(0.097-0.113)
(0.108-0.128)
(0.117-0.139)
0.025
0.030
0.037
0.042
0.049
0.054
0.059
0.065
0.073
0.079
7-day
(0.024-0.027)
(0.028-0.032)
(0.034-0.039)
(0.039-0.045)
(0.045-0.052)
(0.050-0.058)
(0.055-0.064)
(0.060-0.070)
(0.067-0.078)
(0.072-0.085)
0.020
0.024
0.029
0.033
0.038
0.041
0.045
0.049
0.055
0.059
10-day
(0.019-0.021)
(0.023-0.025)
(0.027-0.031)
(0.031-0.035)
(0.035-0.040)
(0.039-0.044)
(0.042-0.048)
(0.046-0.053)
(0.051-0.058)
(0.054-0.063)
0.014
0.016
0.019
0.021
0.024
0.027
0.029
0.031
0.035
0.037
20-day
(0.013-0.014)
(0.015-0.017)
(0.018-0.020)
(0.020-0.022)
(0.023-0.026)
(0.025-0.028)
(0.027-0.031)
(0.029-0.033)
(0.032-0.037)
(0.034-0.040)
0.011
0.013
0.015
0.017
0.019
0.020
0.022
0.023
0.025
0.027
30-day
(0.011-0.012)
(0.013-0.014)
(0.014-0.016)
(0.016-0.018)
(0.018-0.020)
(0.019-0.021)
(0.021-0.023)
(0.022-0.025)
(0.024-0.027)
(0.025-0.028)
0.009
0.011
0.012
0.014
0.015
0.016
0.017
0.018
0.020
0.021
45-day
(0.009-0.010)
(0.010-0.011)
(0.012-0.013)
(0.013-0.014)
(0.014-0.016)
(0.015-0.017)
(0.016-0.018)
(0.017-0.019)
(0.019-0.021)
(0.020-0.022)
0.008
0.010
0.011
0.012
0.013
0.014
0.015
0.016
0.017
0.018
60-day
(0.008-0.009)
(0.009-0.010)
(0.011-0.011)
(0.011-0.012)
(0.013-0.014)
(0.013-0.015)
(0.014-0.016)
(0.015-0.016)
(0.016-0.018)
(0.017-0.018)
Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a
given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not
checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
Back to Top
PF graphical

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Hydrologic Soil Group —Davie County, North Carolina
Hydrologic Soil Group
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
CoA
Codorus loam, 0 to 2
B/D
9.4
5.7%
percent slopes,
frequently flooded
KnA
Kinkora loam, 0 to 2
C/D
9.0
5.4%
percent slopes,
occasionally flooded
MsB
Mocksville sandy loam,
B
5.1
3.1 %
2 to 8 percent slopes
MsC
Mocksville sandy loam,
B
29.1
17.6%
8 to 15 percent slopes
OkB2
Oak Level clay loam, 2
C
44.5
26.8%
to 8 percent slopes,
moderately eroded
RaB
Rasalo fine sandy loam,
C
65.6
39.6%
2 to 8 percent slopes
Ud
Udorthents, loamy
C
0.1
0.1 %
W
Water
3.0
1.8%
Totals for Area of Interest
166.8
100.0%
USDA Natural Resources Web Soil Survey 11/2/2022
Conservation Service National Cooperative Soil Survey Page 3 of 4

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OAK
E N G I N E E R I N G
HYDROCAD OUTPUT
1-YEAR, 24-HOUR STORM EVENT

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 1
Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method
Subcatchment3S: POST TO POND
Subcatchment4S: PRE (OUTFALL#1)
Subcatchment5S: PRE (OUTFALL#2)
Subcatchment6S: PRE (OUTFALL#3)
Subcatchment7S: POST TO POND
Subcatchment9S: POST TO POND
Subcatchment12S: POST TO POND 1
Subcatchment14S: POST TO POND
Subcatchment17S: UNDETAINEDPOST TO OUTFALL1
Runoff Area=27.080 ac 79.03% Impervious Runoff Depth=1.81"
Tc=5.0 min CN=90 Runoff=86.08 cfs 4.086 of
Runoff Area=43.130 ac 0.00% Impervious Runoff Depth=0.74"
Flow Length=1,162' Tc=21.9 min CN=73 Runoff=30.23 cfs 2.670 of
Runoff Area=57.860 ac 0.00% Impervious Runoff Depth=0.79"
Flow Length=1,162' Tc=21.9 min CN=74 Runoff=43.88 cfs 3.809 of
Runoff Area=14.930 ac 0.00% Impervious Runoff Depth=0.74"
Flow Length=1,162' Tc=21.9 min CN=73 Runoff=10.46 cfs 0.924 of
Runoff Area=15.260
ac 72.15% Impervious Runoff Depth=1.65"
Tc=5.0 min CN=88 Runoff=44.76 cfs 2.099 of
Runoff Area=10.550
ac 69.48% Impervious Runoff Depth=1.57"
Tc=5.0 min CN=87 Runoff=29.66 cfs 1.384 of
Runoff Area=31.010 ac 78.30% Impervious Runoff Depth=1.81"
Tc=5.0 min CN=90 Runoff=98.57 cfs 4.678 of
Runoff Area=13.860
ac 74.39% Impervious Runoff Depth=1.73"
Tc=5.0 min CN=89 Runoff=42.36 cfs 1.997 of
Runoff Area=12.390
ac 30.67% Impervious Runoff Depth=0.70"
Tc=5.0 min CN=72 Runoff=14.83 cfs 0.720 of
Subcatchment19S: UNDETAINEDPOST TO OUTFALL2 Runoff Area=14.730 ac 0.00% Impervious Runoff Depth=0.22"
Flow Length=1,162' Tc=21.9 min CN=58
Runoff=1.22 cfs 0.265 of
Subcatchment20S: UNDETAINEDPOST TO OUTFALL3 Runoff Area=3.770 ac 0.00% Impervious Runoff Depth=0.24"
Flow Length=1,162' Tc=21.9 min CN=59
Runoff=0.40 cfs 0.076 of
Pond 2P: POND 2
Peak Elev=714.67' Storage=115,875 cf
Inflow=86.08 cfs 4.086 of
Primary=1.99 cfs 4.074 of Secondary=0.00 cfs 0.000 of
Outflow=1.99 cfs 4.074 of
Pond 8P: POND 3
Peak EIev=703.19' Storage=55,249 cf
Inflow=44.76 cfs 2.099 of
Primary=1.55 cfs 2.063 of Secondary=0.00 cfs 0.000 of
Outflow=1.55 cfs 2.063 of
Pond 10P: POND 4
Peak EIev=680.44' Storage=26,350 cf
Inflow=29.66 cfs 1.384 of
Primary=2.96 cfs 1.384 of Secondary=0.00 cfs 0.000 of
Outflow=2.96 cfs 1.384 of
Pond 11 P: POST - OUTFALL#2
Inflow=7.46 cfs 7.786 of
Primary=7.46 cfs 7.786 of
Pond 13P: POND 1
Peak EIev=704.55' Storage=113,981 cf
Inflow=98.57 cfs 4.678 of
Primary=4.65 cfs 4.670 of Secondary=0.00 cfs 0.000 of
Outflow=4.65 cfs 4.670 of
Pond 15P: POND 6
Peak EIev=678.56' Storage=46,575 cf
Inflow=42.36 cfs 1.997 of
Primary=2.81 cfs 1.985 of Secondary=0.00 cfs 0.000 of
Outflow=2.81 cfs 1.985 of
Pond 18P: POST- OUTFALL#1
Inflow=18.62 cfs 5.390 of
Primary=18.62 cfs 5.390 of
Pond 21 P: POST - OUTFALL#3
Inflow=3.15 cfs 2.061 of
Primary=3.15 cfs 2.061 of
Total Runoff Area = 244.570 ac Runoff Volume = 22.708 of Average
Runoff Depth = 1.11"
68.05% Pervious = 166.440 ac 31.95% Impervious = 78.130 ac

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 2
Summary for Subcatchment 3S: POST TO POND 2
Runoff = 86.08 cfs @ 11.95 hrs, Volume= 4.086 af, Depth= 1.81"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN
Description
21.400 98
Impervious
5.680 61
>75% Grass cover, Good, HSG B
27.080 90
Weighted Average
5.680
20.97% Pervious Area
21.400
79.03% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 3S: POST TO POND 2
Hydrograph
----------------------------- -----------------
9s-- -- --------------- -- -- --------------- -- -- ----- Runoff
90 86.08Cfs--- - ------ - ------
85-- - - -- -- -- -- - - - -- -- Ili -- Ili -- -- - - --- 'Type-H 24_b- -
80 --'----'------' --'-----------'-----�,j--r1 _I_ I I 1
2--Rai----��'75 --_- ---r-
70 - - - - - - - - - - - - - - - - - Ruhoff Ard& 27.080 at -
6s
---------------------------------------------------
so - - - -- - -- -- - - -- -- -- -- nQV-Q11'g=4�� C -
N 55------------------------------------_ --T/+
I I 1
--
50 --RunoffD"th=181'
----------------------------------- :r=
40LL
lillf�--
-- -- -- --------------
35 --'----'---------------------li----------------------- i- N=�i -
30
---------------------------i -- i-- i-- r--i-------------- i-- i--r--i---
25 --�-- --�-- -- -- ----------�---- -- -- -------------�-- -- -- --� --
20
15
10 ---- --- -- -- --------------- -- -- --------------- -- -- -----
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 3
Hydrograph for Subcatchment 3S: POST TO POND 2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.13
8.00
0.34
0.01
0.29
9.00
0.41
0.03
0.63
10.00
0.51
0.06
1.07
11.00
0.66
0.12
2.51
12.00
1.86
0.98
73.87
13.00
2.17
1.24
4.32
14.00
2.30
1.36
2.60
15.00
2.40
1.44
2.07
16.00
2.47
1.51
1.61
17.00
2.53
1.56
1.42
18.00
2.59
1.61
1.25
19.00
2.64
1.65
1.08
20.00
2.68
1.69
0.91
21.00
2.71
1.72
0.87
22.00
2.75
1.75
0.84
23.00
2.78
1.78
0.80
24.00
2.81
1.81
0.77
25.00
2.81
1.81
0.00
26.00
2.81
1.81
0.00
27.00
2.81
1.81
0.00
28.00
2.81
1.81
0.00
29.00
2.81
1.81
0.00
30.00
2.81
1.81
0.00
31.00
2.81
1.81
0.00
32.00
2.81
1.81
0.00
33.00
2.81
1.81
0.00
34.00
2.81
1.81
0.00
35.00
2.81
1.81
0.00
36.00
2.81
1.81
0.00
37.00
2.81
1.81
0.00
38.00
2.81
1.81
0.00
39.00
2.81
1.81
0.00
40.00
2.81
1.81
0.00
41.00
2.81
1.81
0.00
42.00
2.81
1.81
0.00
43.00
2.81
1.81
0.00
44.00
2.81
1.81
0.00
45.00
2.81
1.81
0.00
46.00
2.81
1.81
0.00
47.00
2.81
1.81
0.00
48.00
2.81
1.81
0.00
49.00
2.81
1.81
0.00
50.00
2.81
1.81
0.00
51.00
2.81
1.81
0.00
52.00
2.81
1.81
0.00
53.00
2.81
1.81
0.00
54.00
2.81
1.81
0.00
55.00
2.81
1.81
0.00
56.00
2.81
1.81
0.00
57.00
2.81
1.81
0.00
58.00
2.81
1.81
0.00
59.00
2.81
1.81
0.00
60.00
2.81
1.81
0.00
61.00
2.81
1.81
0.00
62.00
2.81
1.81
0.00
63.00
2.81
1.81
0.00
64.00
2.81
1.81
0.00
65.00
2.81
1.81
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
1.81
0.00
67.00
2.81
1.81
0.00
68.00
2.81
1.81
0.00
69.00
2.81
1.81
0.00
70.00
2.81
1.81
0.00
71.00
2.81
1.81
0.00
72.00
2.81
1.81
0.00
73.00
2.81
1.81
0.00
74.00
2.81
1.81
0.00
75.00
2.81
1.81
0.00
76.00
2.81
1.81
0.00
77.00
2.81
1.81
0.00
78.00
2.81
1.81
0.00
79.00
2.81
1.81
0.00
80.00
2.81
1.81
0.00
81.00
2.81
1.81
0.00
82.00
2.81
1.81
0.00
83.00
2.81
1.81
0.00
84.00
2.81
1.81
0.00
85.00
2.81
1.81
0.00
86.00
2.81
1.81
0.00
87.00
2.81
1.81
0.00
88.00
2.81
1.81
0.00
89.00
2.81
1.81
0.00
90.00
2.81
1.81
0.00
91.00
2.81
1.81
0.00
92.00
2.81
1.81
0.00
93.00
2.81
1.81
0.00
94.00
2.81
1.81
0.00
95.00
2.81
1.81
0.00
96.00
2.81
1.81
0.00
97.00
2.81
1.81
0.00
98.00
2.81
1.81
0.00
99.00
2.81
1.81
0.00
100.00
2.81
1.81
0.00
101.00
2.81
1.81
0.00
102.00
2.81
1.81
0.00
103.00
2.81
1.81
0.00
104.00
2.81
1.81
0.00
105.00
2.81
1.81
0.00
106.00
2.81
1.81
0.00
107.00
2.81
1.81
0.00
108.00
2.81
1.81
0.00
109.00
2.81
1.81
0.00
110.00
2.81
1.81
0.00
111.00
2.81
1.81
0.00
112.00
2.81
1.81
0.00
113.00
2.81
1.81
0.00
114.00
2.81
1.81
0.00
115.00
2.81
1.81
0.00
116.00
2.81
1.81
0.00
117.00
2.81
1.81
0.00
118.00
2.81
1.81
0.00
119.00
2.81
1.81
0.00
120.00
2.81
1.81
0.00

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 4
Summary for Subcatchment 4S: PRE (OUTFALL #1)
Runoff = 30.23 cfs @ 12.17 hrs, Volume= 2.670 af, Depth= 0.74"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN Description
9.130 55 Woods, Good, HSG B
34.000 78 Row crops, straight row, Good, HSG B
43.130 73 Weighted Average
43.130 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 4S: PRE (OUTFALL #1)
Hydrograph
----------y--T--r--r--Ir-------y--rt--rt--+--r--Ir--Ir----y---
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 k 95 160 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 5
Hydrograph for Subcatchment 4S: PRE (OUTFALL #1)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.41
0.00
0.00
10.00
0.51
0.00
0.00
11.00
0.66
0.00
0.00
12.00
1.86
0.26
14.20
13.00
2.17
0.40
4.77
14.00
2.30
0.47
2.68
15.00
2.40
0.51
2.05
16.00
2.47
0.55
1.65
17.00
2.53
0.59
1.42
18.00
2.59
0.62
1.27
19.00
2.64
0.64
1.12
20.00
2.68
0.66
0.96
21.00
2.71
0.69
0.89
22.00
2.75
0.71
0.86
23.00
2.78
0.72
0.83
24.00
2.81
0.74
0.80
25.00
2.81
0.74
0.00
26.00
2.81
0.74
0.00
27.00
2.81
0.74
0.00
28.00
2.81
0.74
0.00
29.00
2.81
0.74
0.00
30.00
2.81
0.74
0.00
31.00
2.81
0.74
0.00
32.00
2.81
0.74
0.00
33.00
2.81
0.74
0.00
34.00
2.81
0.74
0.00
35.00
2.81
0.74
0.00
36.00
2.81
0.74
0.00
37.00
2.81
0.74
0.00
38.00
2.81
0.74
0.00
39.00
2.81
0.74
0.00
40.00
2.81
0.74
0.00
41.00
2.81
0.74
0.00
42.00
2.81
0.74
0.00
43.00
2.81
0.74
0.00
44.00
2.81
0.74
0.00
45.00
2.81
0.74
0.00
46.00
2.81
0.74
0.00
47.00
2.81
0.74
0.00
48.00
2.81
0.74
0.00
49.00
2.81
0.74
0.00
50.00
2.81
0.74
0.00
51.00
2.81
0.74
0.00
52.00
2.81
0.74
0.00
53.00
2.81
0.74
0.00
54.00
2.81
0.74
0.00
55.00
2.81
0.74
0.00
56.00
2.81
0.74
0.00
57.00
2.81
0.74
0.00
58.00
2.81
0.74
0.00
59.00
2.81
0.74
0.00
60.00
2.81
0.74
0.00
61.00
2.81
0.74
0.00
62.00
2.81
0.74
0.00
63.00
2.81
0.74
0.00
64.00
2.81
0.74
0.00
65.00
2.81
0.74
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
0.74
0.00
67.00
2.81
0.74
0.00
68.00
2.81
0.74
0.00
69.00
2.81
0.74
0.00
70.00
2.81
0.74
0.00
71.00
2.81
0.74
0.00
72.00
2.81
0.74
0.00
73.00
2.81
0.74
0.00
74.00
2.81
0.74
0.00
75.00
2.81
0.74
0.00
76.00
2.81
0.74
0.00
77.00
2.81
0.74
0.00
78.00
2.81
0.74
0.00
79.00
2.81
0.74
0.00
80.00
2.81
0.74
0.00
81.00
2.81
0.74
0.00
82.00
2.81
0.74
0.00
83.00
2.81
0.74
0.00
84.00
2.81
0.74
0.00
85.00
2.81
0.74
0.00
86.00
2.81
0.74
0.00
87.00
2.81
0.74
0.00
88.00
2.81
0.74
0.00
89.00
2.81
0.74
0.00
90.00
2.81
0.74
0.00
91.00
2.81
0.74
0.00
92.00
2.81
0.74
0.00
93.00
2.81
0.74
0.00
94.00
2.81
0.74
0.00
95.00
2.81
0.74
0.00
96.00
2.81
0.74
0.00
97.00
2.81
0.74
0.00
98.00
2.81
0.74
0.00
99.00
2.81
0.74
0.00
100.00
2.81
0.74
0.00
101.00
2.81
0.74
0.00
102.00
2.81
0.74
0.00
103.00
2.81
0.74
0.00
104.00
2.81
0.74
0.00
105.00
2.81
0.74
0.00
106.00
2.81
0.74
0.00
107.00
2.81
0.74
0.00
108.00
2.81
0.74
0.00
109.00
2.81
0.74
0.00
110.00
2.81
0.74
0.00
111.00
2.81
0.74
0.00
112.00
2.81
0.74
0.00
113.00
2.81
0.74
0.00
114.00
2.81
0.74
0.00
115.00
2.81
0.74
0.00
116.00
2.81
0.74
0.00
117.00
2.81
0.74
0.00
118.00
2.81
0.74
0.00
119.00
2.81
0.74
0.00
120.00
2.81
0.74
0.00

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 6
Summary for Subcatchment 5S: PRE (OUTFALL #2)
Runoff = 43.88 cfs @ 12.17 hrs, Volume= 3.809 af, Depth= 0.79"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN Description
10.200 55 Woods, Good, HSG B
47.660 78 Row crops, straight row, Good, HSG B
57.860 74 Weighted Average
57.860 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 5S: PRE (OUTFALL #2)
Hydrograph
48
46
--L--L--
cfs T--T--T--T----------T--T--T--T--T--T-----Tn-p--T--T---j'rr--
--1---1---1--J--1--L--
--L--L-------L----L--L--L--
■Runoff
43.88
44
----'---'
--'
--'
--'--------'---'
---'
--' --' --'-----T�i
J-I -"r'--
----
--+-
42
38-
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P'"I
7_8 11
i
36
34
--�--
--'--
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--
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30
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26
----
--- --+--
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----------
-----------
--
--
-- -- -- - -- -- - +-- -- --
Run6 'D�pt a 79"-
1
I
FlbvV-L-d"#h='1-,'�62'--
18
--i-
---T--T--T--T----------T--T--T--T--T--+-----'Tr,==
1-.I
16
14
--,-
--'-
-,--;--;--,---,---,---,---,---,--;--------------------------------
-'-- --
--
--
--------'--
--
--
-- -- -------'-- -- -��� -
12
10
---
--'-
-----T--T--T--
-'----L--L--L--1---1---1--J--1--L--L--L--L-------L--
-------
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--L--L--L--
8
6
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-----7--r--r--r--r----------r--r--r-------7----7--r--r--
4
-----T----------------+-----------+--+--�--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 k 95 160 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 7
Hydrograph for Subcatchment 5S: PRE (OUTFALL #2)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.41
0.00
0.00
10.00
0.51
0.00
0.00
11.00
0.66
0.00
0.00
12.00
1.86
0.29
21.41
13.00
2.17
0.43
6.72
14.00
2.30
0.50
3.75
15.00
2.40
0.55
2.86
16.00
2.47
0.59
2.30
17.00
2.53
0.63
1.98
18.00
2.59
0.66
1.77
19.00
2.64
0.69
1.56
20.00
2.68
0.71
1.33
21.00
2.71
0.73
1.23
22.00
2.75
0.75
1.19
23.00
2.78
0.77
1.15
24.00
2.81
0.79
1.11
25.00
2.81
0.79
0.00
26.00
2.81
0.79
0.00
27.00
2.81
0.79
0.00
28.00
2.81
0.79
0.00
29.00
2.81
0.79
0.00
30.00
2.81
0.79
0.00
31.00
2.81
0.79
0.00
32.00
2.81
0.79
0.00
33.00
2.81
0.79
0.00
34.00
2.81
0.79
0.00
35.00
2.81
0.79
0.00
36.00
2.81
0.79
0.00
37.00
2.81
0.79
0.00
38.00
2.81
0.79
0.00
39.00
2.81
0.79
0.00
40.00
2.81
0.79
0.00
41.00
2.81
0.79
0.00
42.00
2.81
0.79
0.00
43.00
2.81
0.79
0.00
44.00
2.81
0.79
0.00
45.00
2.81
0.79
0.00
46.00
2.81
0.79
0.00
47.00
2.81
0.79
0.00
48.00
2.81
0.79
0.00
49.00
2.81
0.79
0.00
50.00
2.81
0.79
0.00
51.00
2.81
0.79
0.00
52.00
2.81
0.79
0.00
53.00
2.81
0.79
0.00
54.00
2.81
0.79
0.00
55.00
2.81
0.79
0.00
56.00
2.81
0.79
0.00
57.00
2.81
0.79
0.00
58.00
2.81
0.79
0.00
59.00
2.81
0.79
0.00
60.00
2.81
0.79
0.00
61.00
2.81
0.79
0.00
62.00
2.81
0.79
0.00
63.00
2.81
0.79
0.00
64.00
2.81
0.79
0.00
65.00
2.81
0.79
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
0.79
0.00
67.00
2.81
0.79
0.00
68.00
2.81
0.79
0.00
69.00
2.81
0.79
0.00
70.00
2.81
0.79
0.00
71.00
2.81
0.79
0.00
72.00
2.81
0.79
0.00
73.00
2.81
0.79
0.00
74.00
2.81
0.79
0.00
75.00
2.81
0.79
0.00
76.00
2.81
0.79
0.00
77.00
2.81
0.79
0.00
78.00
2.81
0.79
0.00
79.00
2.81
0.79
0.00
80.00
2.81
0.79
0.00
81.00
2.81
0.79
0.00
82.00
2.81
0.79
0.00
83.00
2.81
0.79
0.00
84.00
2.81
0.79
0.00
85.00
2.81
0.79
0.00
86.00
2.81
0.79
0.00
87.00
2.81
0.79
0.00
88.00
2.81
0.79
0.00
89.00
2.81
0.79
0.00
90.00
2.81
0.79
0.00
91.00
2.81
0.79
0.00
92.00
2.81
0.79
0.00
93.00
2.81
0.79
0.00
94.00
2.81
0.79
0.00
95.00
2.81
0.79
0.00
96.00
2.81
0.79
0.00
97.00
2.81
0.79
0.00
98.00
2.81
0.79
0.00
99.00
2.81
0.79
0.00
100.00
2.81
0.79
0.00
101.00
2.81
0.79
0.00
102.00
2.81
0.79
0.00
103.00
2.81
0.79
0.00
104.00
2.81
0.79
0.00
105.00
2.81
0.79
0.00
106.00
2.81
0.79
0.00
107.00
2.81
0.79
0.00
108.00
2.81
0.79
0.00
109.00
2.81
0.79
0.00
110.00
2.81
0.79
0.00
111.00
2.81
0.79
0.00
112.00
2.81
0.79
0.00
113.00
2.81
0.79
0.00
114.00
2.81
0.79
0.00
115.00
2.81
0.79
0.00
116.00
2.81
0.79
0.00
117.00
2.81
0.79
0.00
118.00
2.81
0.79
0.00
119.00
2.81
0.79
0.00
120.00
2.81
0.79
0.00

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 8
Summary for Subcatchment 6S: PRE (OUTFALL #3)
Runoff = 10.46 cfs @ 12.17 hrs, Volume= 0.924 af, Depth= 0.74"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN Description
3.190 55 Woods, Good, HSG B
11.740 78 Row crops, straight row, Good, HSG B
14.930 73 Weighted Average
14.930 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 6S: PRE (OUTFALL #3)
Hydrograph
----------�--+--+--�--�---�---�--�--�--�--+--�--�--�---�--�--�--+--+--�-- ■Runoff
11 10.46 cfs
--------------------------------------------
10 I YpQ- - _ hl
Ir -
-- - T--r- - ---1yrrUhr-RainfalrT2.81�F-
-- --- -- --; --; --, -
------I- - 4 --4 -Runoff Ard&14.930 at -
7
1 i np f-VQIO*e=0: 4 � -
w--',-- -'I-- -- -- --', --'I--'I---'1---', -- -- -- -- - - rt +F -
6 Runoff Depth4r74
LL -- -- -- --' ----------Ftbw!-tdn-0th--1-,462U-
s
3
2
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 k 95 160 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 9
Hydrograph for Subcatchment 6S: PRE (OUTFALL #3)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.41
0.00
0.00
10.00
0.51
0.00
0.00
11.00
0.66
0.00
0.00
12.00
1.86
0.26
4.91
13.00
2.17
0.40
1.65
14.00
2.30
0.47
0.93
15.00
2.40
0.51
0.71
16.00
2.47
0.55
0.57
17.00
2.53
0.59
0.49
18.00
2.59
0.62
0.44
19.00
2.64
0.64
0.39
20.00
2.68
0.66
0.33
21.00
2.71
0.69
0.31
22.00
2.75
0.71
0.30
23.00
2.78
0.72
0.29
24.00
2.81
0.74
0.28
25.00
2.81
0.74
0.00
26.00
2.81
0.74
0.00
27.00
2.81
0.74
0.00
28.00
2.81
0.74
0.00
29.00
2.81
0.74
0.00
30.00
2.81
0.74
0.00
31.00
2.81
0.74
0.00
32.00
2.81
0.74
0.00
33.00
2.81
0.74
0.00
34.00
2.81
0.74
0.00
35.00
2.81
0.74
0.00
36.00
2.81
0.74
0.00
37.00
2.81
0.74
0.00
38.00
2.81
0.74
0.00
39.00
2.81
0.74
0.00
40.00
2.81
0.74
0.00
41.00
2.81
0.74
0.00
42.00
2.81
0.74
0.00
43.00
2.81
0.74
0.00
44.00
2.81
0.74
0.00
45.00
2.81
0.74
0.00
46.00
2.81
0.74
0.00
47.00
2.81
0.74
0.00
48.00
2.81
0.74
0.00
49.00
2.81
0.74
0.00
50.00
2.81
0.74
0.00
51.00
2.81
0.74
0.00
52.00
2.81
0.74
0.00
53.00
2.81
0.74
0.00
54.00
2.81
0.74
0.00
55.00
2.81
0.74
0.00
56.00
2.81
0.74
0.00
57.00
2.81
0.74
0.00
58.00
2.81
0.74
0.00
59.00
2.81
0.74
0.00
60.00
2.81
0.74
0.00
61.00
2.81
0.74
0.00
62.00
2.81
0.74
0.00
63.00
2.81
0.74
0.00
64.00
2.81
0.74
0.00
65.00
2.81
0.74
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
0.74
0.00
67.00
2.81
0.74
0.00
68.00
2.81
0.74
0.00
69.00
2.81
0.74
0.00
70.00
2.81
0.74
0.00
71.00
2.81
0.74
0.00
72.00
2.81
0.74
0.00
73.00
2.81
0.74
0.00
74.00
2.81
0.74
0.00
75.00
2.81
0.74
0.00
76.00
2.81
0.74
0.00
77.00
2.81
0.74
0.00
78.00
2.81
0.74
0.00
79.00
2.81
0.74
0.00
80.00
2.81
0.74
0.00
81.00
2.81
0.74
0.00
82.00
2.81
0.74
0.00
83.00
2.81
0.74
0.00
84.00
2.81
0.74
0.00
85.00
2.81
0.74
0.00
86.00
2.81
0.74
0.00
87.00
2.81
0.74
0.00
88.00
2.81
0.74
0.00
89.00
2.81
0.74
0.00
90.00
2.81
0.74
0.00
91.00
2.81
0.74
0.00
92.00
2.81
0.74
0.00
93.00
2.81
0.74
0.00
94.00
2.81
0.74
0.00
95.00
2.81
0.74
0.00
96.00
2.81
0.74
0.00
97.00
2.81
0.74
0.00
98.00
2.81
0.74
0.00
99.00
2.81
0.74
0.00
100.00
2.81
0.74
0.00
101.00
2.81
0.74
0.00
102.00
2.81
0.74
0.00
103.00
2.81
0.74
0.00
104.00
2.81
0.74
0.00
105.00
2.81
0.74
0.00
106.00
2.81
0.74
0.00
107.00
2.81
0.74
0.00
108.00
2.81
0.74
0.00
109.00
2.81
0.74
0.00
110.00
2.81
0.74
0.00
111.00
2.81
0.74
0.00
112.00
2.81
0.74
0.00
113.00
2.81
0.74
0.00
114.00
2.81
0.74
0.00
115.00
2.81
0.74
0.00
116.00
2.81
0.74
0.00
117.00
2.81
0.74
0.00
118.00
2.81
0.74
0.00
119.00
2.81
0.74
0.00
120.00
2.81
0.74
0.00

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 10
Summary for Subcatchment 7S: POST TO POND 3
Runoff = 44.76 cfs @ 11.96 hrs, Volume= 2.099 af, Depth= 1.65"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN
Description
11.010 98
Impervious
4.250 61
>75% Grass cover, Good, HSG B
15.260 88
Weighted Average
4.250
27.85% Pervious Area
11.010
72.15% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 7S: POST TO POND 3
Hydrograph
44.76cfs T--�--�--�-----I---I--�--�--�--�--r--��--I---I--�--�--�--r--��--
■ Runoff
4b----------i
44
----
----+--+--+--+----------+--+--+--+--+--+-----
--
-------
--
----- - -- -i-------_- - -- - -- -----
TylN124-h'--
" M
42
40
j
--;--
--'--
--;--T--T--;---;---;---;---;--T--T--T-----------------I����-��-�-,,..�I��-----=--
------1--L--r--------------�-�1
1
rT��Ra11111Q�IT�.�ln
38
36
r
--'--
1--r--r--r--r--r--1--
-----1
L
L--
--1---1---1--J--1--L-Runoff
1--r--7--r--
-r--r--1---1- r--r--r--r--r--
T
Aftatl5.260-at -
34
j
--I--
----r--r--r--r--------1--r--
7--
-
7-- r-- r-- r--1--- I-- 7-- 7-- T-- r-- r32
11 Y LJ�
30
--1--
--1--+--+--+--+--1---1---1--+--+--+
28
26
--;--
----
--;--1--1--------;---;---;-----1--1-----l�iraQfl�e�p��5;,r_
----+--+--+--+----------+--+--+--+--
0 24
iL 22
----
---- 1--
1--;---;---;-----------?--?--------------;--
+--L--r--I
- - --
-r--------- c:i :510-ftlih--
20
18
----
--'--
---- T--
--'----1--L--r--1---1---1--J--1--1--
1
T --T
--
---------
1
--
--
--r--T--T------- -- -- N
--L---------J--1- -
1 1
16
--1--
--1--,--r--r--r--1---
r--r--r--r--1--7--7--r--r--r--
14
12
--'--
--r-
--'--L--1--L--L--1---1---1--J--1--L--L--L--+-------J--L--1--L--
-1--r--r--r--r--r--1---1--r--r--r--r--r--r--r--1--r--r--r--r--r--
--
$
--1----1--+--+--r--r--1---1--------+--r--+--1---1----
--T--r--+--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 11
Hydrograph for Subcatchment 7S: POST TO POND 3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.08
9.00
0.41
0.01
0.23
10.00
0.51
0.03
0.44
11.00
0.66
0.09
1.14
12.00
1.86
0.86
38.73
13.00
2.17
1.10
2.32
14.00
2.30
1.22
1.40
15.00
2.40
1.29
1.12
16.00
2.47
1.36
0.87
17.00
2.53
1.41
0.77
18.00
2.59
1.46
0.68
19.00
2.64
1.50
0.59
20.00
2.68
1.53
0.50
21.00
2.71
1.56
0.47
22.00
2.75
1.59
0.45
23.00
2.78
1.62
0.44
24.00
2.81
1.65
0.42
25.00
2.81
1.65
0.00
26.00
2.81
1.65
0.00
27.00
2.81
1.65
0.00
28.00
2.81
1.65
0.00
29.00
2.81
1.65
0.00
30.00
2.81
1.65
0.00
31.00
2.81
1.65
0.00
32.00
2.81
1.65
0.00
33.00
2.81
1.65
0.00
34.00
2.81
1.65
0.00
35.00
2.81
1.65
0.00
36.00
2.81
1.65
0.00
37.00
2.81
1.65
0.00
38.00
2.81
1.65
0.00
39.00
2.81
1.65
0.00
40.00
2.81
1.65
0.00
41.00
2.81
1.65
0.00
42.00
2.81
1.65
0.00
43.00
2.81
1.65
0.00
44.00
2.81
1.65
0.00
45.00
2.81
1.65
0.00
46.00
2.81
1.65
0.00
47.00
2.81
1.65
0.00
48.00
2.81
1.65
0.00
49.00
2.81
1.65
0.00
50.00
2.81
1.65
0.00
51.00
2.81
1.65
0.00
52.00
2.81
1.65
0.00
53.00
2.81
1.65
0.00
54.00
2.81
1.65
0.00
55.00
2.81
1.65
0.00
56.00
2.81
1.65
0.00
57.00
2.81
1.65
0.00
58.00
2.81
1.65
0.00
59.00
2.81
1.65
0.00
60.00
2.81
1.65
0.00
61.00
2.81
1.65
0.00
62.00
2.81
1.65
0.00
63.00
2.81
1.65
0.00
64.00
2.81
1.65
0.00
65.00
2.81
1.65
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
1.65
0.00
67.00
2.81
1.65
0.00
68.00
2.81
1.65
0.00
69.00
2.81
1.65
0.00
70.00
2.81
1.65
0.00
71.00
2.81
1.65
0.00
72.00
2.81
1.65
0.00
73.00
2.81
1.65
0.00
74.00
2.81
1.65
0.00
75.00
2.81
1.65
0.00
76.00
2.81
1.65
0.00
77.00
2.81
1.65
0.00
78.00
2.81
1.65
0.00
79.00
2.81
1.65
0.00
80.00
2.81
1.65
0.00
81.00
2.81
1.65
0.00
82.00
2.81
1.65
0.00
83.00
2.81
1.65
0.00
84.00
2.81
1.65
0.00
85.00
2.81
1.65
0.00
86.00
2.81
1.65
0.00
87.00
2.81
1.65
0.00
88.00
2.81
1.65
0.00
89.00
2.81
1.65
0.00
90.00
2.81
1.65
0.00
91.00
2.81
1.65
0.00
92.00
2.81
1.65
0.00
93.00
2.81
1.65
0.00
94.00
2.81
1.65
0.00
95.00
2.81
1.65
0.00
96.00
2.81
1.65
0.00
97.00
2.81
1.65
0.00
98.00
2.81
1.65
0.00
99.00
2.81
1.65
0.00
100.00
2.81
1.65
0.00
101.00
2.81
1.65
0.00
102.00
2.81
1.65
0.00
103.00
2.81
1.65
0.00
104.00
2.81
1.65
0.00
105.00
2.81
1.65
0.00
106.00
2.81
1.65
0.00
107.00
2.81
1.65
0.00
108.00
2.81
1.65
0.00
109.00
2.81
1.65
0.00
110.00
2.81
1.65
0.00
111.00
2.81
1.65
0.00
112.00
2.81
1.65
0.00
113.00
2.81
1.65
0.00
114.00
2.81
1.65
0.00
115.00
2.81
1.65
0.00
116.00
2.81
1.65
0.00
117.00
2.81
1.65
0.00
118.00
2.81
1.65
0.00
119.00
2.81
1.65
0.00
120.00
2.81
1.65
0.00

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 12
Summary for Subcatchment 9S: POST TO POND 4
Runoff = 29.66 cfs @ 11.96 hrs, Volume= 1.384 af, Depth= 1.57"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN Description
7.330 98 Impervious
3.220 61 >75% Grass cover, Good, HSG B
10.550 87 Weighted Average
3.220 30.52% Pervious Area
7.330 69.48% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 9S: POST TO POND 4
Hydrograph
3229.66 CfS - -----------'I--- - -- -- -----------'I--- - -- --- ■Runoff
30
-I------+--+--+--r--r-------+--+--+--+--r--r--r--i• P e *24-hir -
28 --'-------1--L------'---'--------L---------------1--L--�--
26 - -'- -
-- - 'I_lyrrMr RainfaIIT2.,�8t
--r-
24 ------Y--r--r------------rt--rt-Runoff Ar6&40.-550-at -
22 ------1--L----1---1---1--J--1-- --1 1 I- '--1--
20 --I-- j1�i�npffl Vp1uirpe=1:go 0
I I I I I I I I I I I I I I I I I I I I I�� I
u 1g Runoff Qepth:0- 711 -
.- --I-- --I----+--+----------I-- -- -- --+-- j+ s
O16 --�--------1--L--L--1---1---1--J--1--1----L--L--1---�- y��=}^
14 I I I I I I I I I I I I I I I I I I I I I I
12
--r-----r--r--r--r--r-------r--r--r--r--r--r--r----r--r-- --r- r--
10 --'-- --'----1--L--L--1---1---1--J--1--1--L--L--+-------J--1--1--L-- --
8
6
j
4 --'-- -'----1--L--L--1---1---1--J--1--1--L--L--L--1---1--J----1--L--L--
2
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 13
Hydrograph for Subcatchment 9S: POST TO POND 4
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.03
9.00
0.41
0.01
0.12
10.00
0.51
0.03
0.26
11.00
0.66
0.07
0.70
12.00
1.86
0.80
25.76
13.00
2.17
1.04
1.56
14.00
2.30
1.15
0.94
15.00
2.40
1.23
0.75
16.00
2.47
1.29
0.59
17.00
2.53
1.34
0.52
18.00
2.59
1.39
0.46
19.00
2.64
1.42
0.40
20.00
2.68
1.46
0.34
21.00
2.71
1.49
0.32
22.00
2.75
1.52
0.31
23.00
2.78
1.55
0.30
24.00
2.81
1.57
0.28
25.00
2.81
1.57
0.00
26.00
2.81
1.57
0.00
27.00
2.81
1.57
0.00
28.00
2.81
1.57
0.00
29.00
2.81
1.57
0.00
30.00
2.81
1.57
0.00
31.00
2.81
1.57
0.00
32.00
2.81
1.57
0.00
33.00
2.81
1.57
0.00
34.00
2.81
1.57
0.00
35.00
2.81
1.57
0.00
36.00
2.81
1.57
0.00
37.00
2.81
1.57
0.00
38.00
2.81
1.57
0.00
39.00
2.81
1.57
0.00
40.00
2.81
1.57
0.00
41.00
2.81
1.57
0.00
42.00
2.81
1.57
0.00
43.00
2.81
1.57
0.00
44.00
2.81
1.57
0.00
45.00
2.81
1.57
0.00
46.00
2.81
1.57
0.00
47.00
2.81
1.57
0.00
48.00
2.81
1.57
0.00
49.00
2.81
1.57
0.00
50.00
2.81
1.57
0.00
51.00
2.81
1.57
0.00
52.00
2.81
1.57
0.00
53.00
2.81
1.57
0.00
54.00
2.81
1.57
0.00
55.00
2.81
1.57
0.00
56.00
2.81
1.57
0.00
57.00
2.81
1.57
0.00
58.00
2.81
1.57
0.00
59.00
2.81
1.57
0.00
60.00
2.81
1.57
0.00
61.00
2.81
1.57
0.00
62.00
2.81
1.57
0.00
63.00
2.81
1.57
0.00
64.00
2.81
1.57
0.00
65.00
2.81
1.57
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
1.57
0.00
67.00
2.81
1.57
0.00
68.00
2.81
1.57
0.00
69.00
2.81
1.57
0.00
70.00
2.81
1.57
0.00
71.00
2.81
1.57
0.00
72.00
2.81
1.57
0.00
73.00
2.81
1.57
0.00
74.00
2.81
1.57
0.00
75.00
2.81
1.57
0.00
76.00
2.81
1.57
0.00
77.00
2.81
1.57
0.00
78.00
2.81
1.57
0.00
79.00
2.81
1.57
0.00
80.00
2.81
1.57
0.00
81.00
2.81
1.57
0.00
82.00
2.81
1.57
0.00
83.00
2.81
1.57
0.00
84.00
2.81
1.57
0.00
85.00
2.81
1.57
0.00
86.00
2.81
1.57
0.00
87.00
2.81
1.57
0.00
88.00
2.81
1.57
0.00
89.00
2.81
1.57
0.00
90.00
2.81
1.57
0.00
91.00
2.81
1.57
0.00
92.00
2.81
1.57
0.00
93.00
2.81
1.57
0.00
94.00
2.81
1.57
0.00
95.00
2.81
1.57
0.00
96.00
2.81
1.57
0.00
97.00
2.81
1.57
0.00
98.00
2.81
1.57
0.00
99.00
2.81
1.57
0.00
100.00
2.81
1.57
0.00
101.00
2.81
1.57
0.00
102.00
2.81
1.57
0.00
103.00
2.81
1.57
0.00
104.00
2.81
1.57
0.00
105.00
2.81
1.57
0.00
106.00
2.81
1.57
0.00
107.00
2.81
1.57
0.00
108.00
2.81
1.57
0.00
109.00
2.81
1.57
0.00
110.00
2.81
1.57
0.00
111.00
2.81
1.57
0.00
112.00
2.81
1.57
0.00
113.00
2.81
1.57
0.00
114.00
2.81
1.57
0.00
115.00
2.81
1.57
0.00
116.00
2.81
1.57
0.00
117.00
2.81
1.57
0.00
118.00
2.81
1.57
0.00
119.00
2.81
1.57
0.00
120.00
2.81
1.57
0.00

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 14
Summary for Subcatchment 12S: POST TO POND 1
Runoff = 98.57 cfs @ 11.95 hrs, Volume= 4.678 af, Depth= 1.81"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN
Description
24.280 98
Impervious
6.730 61
>75% Grass cover, Good, HSG B
31.010 90
Weighted Average
6.730
21.70% Pervious Area
24.280
78.30% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 12S: POST TO POND 1
Hydrograph
110---------7--T--r-4--i----I-- T - -
T--i-----i----T--r--i-------7--+-- Runoff
105 98.57 cfs - +-- - -- --+-- - -- r-- -- --
100 ---- ---1--1--L----1--J--1--1--L--1------'-- -- -- y„p-[C-Fir-
95 --i-- -+--+--+--r--+--i--+--+--+--+--i---i---i--+--+--
a5 - -------'--', --',----------------', --' �C[r4r==1'1f111�lli•=
ao- -- - -- -- -- -- ---- -- --+-- --
I - Ruhaff Artda=3fi.V1--ad-
75 ---- -+--+--+--+--+----+--+--+--+-------+--+--+--+--+-----I--+--+--
70 g----------- m;---------�f --�---T--T--r-- ---- ----+--r--
65 ' --'-- --'i-- it --'i --'i--'---'---'-- it -- it --'i---------- i-- i------------- i -----
u 60 --'-- J--1--1--L--L----J---
-+--L-------Rnoff LJ.Pt1hZ1n
3 55 ---- +--+--+--+--+----+--+--+--+----------+--+--+----------+--y+,--
l0 50 --r- __T-- T--r--r --I--__T--T--r--r-----I--T--T--r-Tc=*A-Mitt
45 --'i - -'-- -- -- --'i-----'i-- -- -- --'i-----'i-- -- -- --'i------- -----
40 --'---'---'--'---'---'---'---'-------------------------------'- =g
i l I
35 --+- +--+--+--+--+-+--+--+--+--+--+----+--+--+--+--+--I---I--+--+--
30 --r- r--r--r--r--r--i--r--r--r--r--r--i---i--r--r--r--r--i---i--r--+--
25 --li - -li-- -- -- --i-----li-- -- -- --i-----li---- --li --i-----li-- -- --
20 --'-- -'-- + -- ----------'-- -- + ----------'-- -- ----------'-- -- + --
15 ---- -- -- -- -- ---- -- --+------------ -- -- ----------'--+--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 15
Hydrograph for Subcatchment 12S: POST TO POND 1
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.15
8.00
0.34
0.01
0.33
9.00
0.41
0.03
0.72
10.00
0.51
0.06
1.23
11.00
0.66
0.12
2.88
12.00
1.86
0.98
84.59
13.00
2.17
1.24
4.95
14.00
2.30
1.36
2.97
15.00
2.40
1.44
2.38
16.00
2.47
1.51
1.84
17.00
2.53
1.56
1.63
18.00
2.59
1.61
1.43
19.00
2.64
1.65
1.24
20.00
2.68
1.69
1.05
21.00
2.71
1.72
1.00
22.00
2.75
1.75
0.96
23.00
2.78
1.78
0.92
24.00
2.81
1.81
0.88
25.00
2.81
1.81
0.00
26.00
2.81
1.81
0.00
27.00
2.81
1.81
0.00
28.00
2.81
1.81
0.00
29.00
2.81
1.81
0.00
30.00
2.81
1.81
0.00
31.00
2.81
1.81
0.00
32.00
2.81
1.81
0.00
33.00
2.81
1.81
0.00
34.00
2.81
1.81
0.00
35.00
2.81
1.81
0.00
36.00
2.81
1.81
0.00
37.00
2.81
1.81
0.00
38.00
2.81
1.81
0.00
39.00
2.81
1.81
0.00
40.00
2.81
1.81
0.00
41.00
2.81
1.81
0.00
42.00
2.81
1.81
0.00
43.00
2.81
1.81
0.00
44.00
2.81
1.81
0.00
45.00
2.81
1.81
0.00
46.00
2.81
1.81
0.00
47.00
2.81
1.81
0.00
48.00
2.81
1.81
0.00
49.00
2.81
1.81
0.00
50.00
2.81
1.81
0.00
51.00
2.81
1.81
0.00
52.00
2.81
1.81
0.00
53.00
2.81
1.81
0.00
54.00
2.81
1.81
0.00
55.00
2.81
1.81
0.00
56.00
2.81
1.81
0.00
57.00
2.81
1.81
0.00
58.00
2.81
1.81
0.00
59.00
2.81
1.81
0.00
60.00
2.81
1.81
0.00
61.00
2.81
1.81
0.00
62.00
2.81
1.81
0.00
63.00
2.81
1.81
0.00
64.00
2.81
1.81
0.00
65.00
2.81
1.81
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
1.81
0.00
67.00
2.81
1.81
0.00
68.00
2.81
1.81
0.00
69.00
2.81
1.81
0.00
70.00
2.81
1.81
0.00
71.00
2.81
1.81
0.00
72.00
2.81
1.81
0.00
73.00
2.81
1.81
0.00
74.00
2.81
1.81
0.00
75.00
2.81
1.81
0.00
76.00
2.81
1.81
0.00
77.00
2.81
1.81
0.00
78.00
2.81
1.81
0.00
79.00
2.81
1.81
0.00
80.00
2.81
1.81
0.00
81.00
2.81
1.81
0.00
82.00
2.81
1.81
0.00
83.00
2.81
1.81
0.00
84.00
2.81
1.81
0.00
85.00
2.81
1.81
0.00
86.00
2.81
1.81
0.00
87.00
2.81
1.81
0.00
88.00
2.81
1.81
0.00
89.00
2.81
1.81
0.00
90.00
2.81
1.81
0.00
91.00
2.81
1.81
0.00
92.00
2.81
1.81
0.00
93.00
2.81
1.81
0.00
94.00
2.81
1.81
0.00
95.00
2.81
1.81
0.00
96.00
2.81
1.81
0.00
97.00
2.81
1.81
0.00
98.00
2.81
1.81
0.00
99.00
2.81
1.81
0.00
100.00
2.81
1.81
0.00
101.00
2.81
1.81
0.00
102.00
2.81
1.81
0.00
103.00
2.81
1.81
0.00
104.00
2.81
1.81
0.00
105.00
2.81
1.81
0.00
106.00
2.81
1.81
0.00
107.00
2.81
1.81
0.00
108.00
2.81
1.81
0.00
109.00
2.81
1.81
0.00
110.00
2.81
1.81
0.00
111.00
2.81
1.81
0.00
112.00
2.81
1.81
0.00
113.00
2.81
1.81
0.00
114.00
2.81
1.81
0.00
115.00
2.81
1.81
0.00
116.00
2.81
1.81
0.00
117.00
2.81
1.81
0.00
118.00
2.81
1.81
0.00
119.00
2.81
1.81
0.00
120.00
2.81
1.81
0.00

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 16
Summary for Subcatchment 14S: POST TO POND 6
Runoff = 42.36 cfs @ 11.96 hrs, Volume= 1.997 af, Depth= 1.73"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN
Description
10.310 98
Impervious
3.550 61
>75% Grass cover, Good, HSG B
13.860 89
Weighted Average
3.550
25.61 % Pervious Area
10.310
74.39% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 14S: POST TO POND 6
Hydrograph
46
44
--r--I---I--r--r--r--r--r--I---I--r--r--r--r--r--r--r--I--r--r--r--r--r--
-- -- --I --I --I- --I --
cfs--+--L--------------1--1----L-----------1--T--L--�--
■Runoff
42.36
42
----,--T--r----------'-- -- ----r--r--------'I� 1pe-NT24-h�`r-
--I--
40
38
--�--
--'�--
--�-- -- -- ----------�---- -- -- -------1---I
------------r-----------1rr3h1` Ra--irir-f-r-f-rZ--.r-9-"�1r---
36
34
--1--
--r--r--r--r-- -I --- I- - r-r -r ---I---
I I I I I I I - I I ---- ----�--�------------ -- -RunfAt&Ia860t-
32
30
j
----
--�� -
----+--+--+--+----------+--+--+--+--+--+-------+--+--+--+--+--
-----1 T--r--r--�1--------T--_T-- +
I I rrOffl tfplt�mle 1: - f
28
w 26
----
I
--I--
---- -- -- ----------I---I-- --
I I I I I I I I I I I I I I I I
--I----t--r--r--------I----r--r--r--Runo#f'IDepth l.73�`_
24
0 22
LL
20
i
--�--
--'--
--r-
--�------------------�---- -- -----
--'----+--L---------------------------'- y��=}^
T�ITV.I�-%n��l
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14
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10
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---+--+--+--+----------+--+--+--+--+--+-------+--+--+--+--+--
8
I
I I
6
--'--
I
---!--! --! --!-----------'--! --! --! --!-----------'--! --! --! --'---
I I I I I I I I I I I I I I I I I I I I I
4
--�--
---+--+--+--+----------+--+--+--+--+--+-------+--+--+--+--+--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 17
Hydrograph for Subcatchment 14S: POST TO POND 6
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.03
8.00
0.34
0.01
0.11
9.00
0.41
0.02
0.26
10.00
0.51
0.05
0.47
11.00
0.66
0.10
1.16
12.00
1.86
0.92
36.50
13.00
2.17
1.17
2.16
14.00
2.30
1.28
1.30
15.00
2.40
1.37
1.04
16.00
2.47
1.43
0.81
17.00
2.53
1.48
0.71
18.00
2.59
1.53
0.63
19.00
2.64
1.57
0.54
20.00
2.68
1.61
0.46
21.00
2.71
1.64
0.44
22.00
2.75
1.67
0.42
23.00
2.78
1.70
0.40
24.00
2.81
1.73
0.39
25.00
2.81
1.73
0.00
26.00
2.81
1.73
0.00
27.00
2.81
1.73
0.00
28.00
2.81
1.73
0.00
29.00
2.81
1.73
0.00
30.00
2.81
1.73
0.00
31.00
2.81
1.73
0.00
32.00
2.81
1.73
0.00
33.00
2.81
1.73
0.00
34.00
2.81
1.73
0.00
35.00
2.81
1.73
0.00
36.00
2.81
1.73
0.00
37.00
2.81
1.73
0.00
38.00
2.81
1.73
0.00
39.00
2.81
1.73
0.00
40.00
2.81
1.73
0.00
41.00
2.81
1.73
0.00
42.00
2.81
1.73
0.00
43.00
2.81
1.73
0.00
44.00
2.81
1.73
0.00
45.00
2.81
1.73
0.00
46.00
2.81
1.73
0.00
47.00
2.81
1.73
0.00
48.00
2.81
1.73
0.00
49.00
2.81
1.73
0.00
50.00
2.81
1.73
0.00
51.00
2.81
1.73
0.00
52.00
2.81
1.73
0.00
53.00
2.81
1.73
0.00
54.00
2.81
1.73
0.00
55.00
2.81
1.73
0.00
56.00
2.81
1.73
0.00
57.00
2.81
1.73
0.00
58.00
2.81
1.73
0.00
59.00
2.81
1.73
0.00
60.00
2.81
1.73
0.00
61.00
2.81
1.73
0.00
62.00
2.81
1.73
0.00
63.00
2.81
1.73
0.00
64.00
2.81
1.73
0.00
65.00
2.81
1.73
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
1.73
0.00
67.00
2.81
1.73
0.00
68.00
2.81
1.73
0.00
69.00
2.81
1.73
0.00
70.00
2.81
1.73
0.00
71.00
2.81
1.73
0.00
72.00
2.81
1.73
0.00
73.00
2.81
1.73
0.00
74.00
2.81
1.73
0.00
75.00
2.81
1.73
0.00
76.00
2.81
1.73
0.00
77.00
2.81
1.73
0.00
78.00
2.81
1.73
0.00
79.00
2.81
1.73
0.00
80.00
2.81
1.73
0.00
81.00
2.81
1.73
0.00
82.00
2.81
1.73
0.00
83.00
2.81
1.73
0.00
84.00
2.81
1.73
0.00
85.00
2.81
1.73
0.00
86.00
2.81
1.73
0.00
87.00
2.81
1.73
0.00
88.00
2.81
1.73
0.00
89.00
2.81
1.73
0.00
90.00
2.81
1.73
0.00
91.00
2.81
1.73
0.00
92.00
2.81
1.73
0.00
93.00
2.81
1.73
0.00
94.00
2.81
1.73
0.00
95.00
2.81
1.73
0.00
96.00
2.81
1.73
0.00
97.00
2.81
1.73
0.00
98.00
2.81
1.73
0.00
99.00
2.81
1.73
0.00
100.00
2.81
1.73
0.00
101.00
2.81
1.73
0.00
102.00
2.81
1.73
0.00
103.00
2.81
1.73
0.00
104.00
2.81
1.73
0.00
105.00
2.81
1.73
0.00
106.00
2.81
1.73
0.00
107.00
2.81
1.73
0.00
108.00
2.81
1.73
0.00
109.00
2.81
1.73
0.00
110.00
2.81
1.73
0.00
111.00
2.81
1.73
0.00
112.00
2.81
1.73
0.00
113.00
2.81
1.73
0.00
114.00
2.81
1.73
0.00
115.00
2.81
1.73
0.00
116.00
2.81
1.73
0.00
117.00
2.81
1.73
0.00
118.00
2.81
1.73
0.00
119.00
2.81
1.73
0.00
120.00
2.81
1.73
0.00

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 18
Summary for Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Runoff = 14.83 cfs @ 11.97 hrs, Volume= 0.720 af, Depth= 0.70"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac) CN Description
3.800 98 Impervious
8.590 61 >75% Grass cover, Good, HSG B
12.390 72 Weighted Average
8.590 69.33% Pervious Area
3.800 30.67% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Hydrograph
16 14.83 CfS - -----------------'I-- -- -----------------'I-- - -----'I--- ■Runoff
15 I I I I I I I I I I I I I I u
+-----+--+--+--r--r-------+--+--+--+--r--r-----
iT-y" 24—hlr-
-- - '.1�rr24hr Rai nfaIIT2.,�81�,"
13 I I
--i--
12 --'I----r--r--r--------'I----r--r-Ruhioff Ar6a:�:12.-894-at -
11
10 --'I-- I�i�npff'I Vp1�m',e=0: 2�-� -
- I I I I I I I I I I I I T F I I I I I I T I
--+- -+--+--+--+--+--+--I__+--+--+--+--+--
Runoff-IDepth4_7ol• -
o $ - -- ------1--L------------J--i--i-- --L--L-----1- c�=}^
7-
6 I I I I I I I I I I I I I I I I I I I I I I
-- - --�--!-r--r--r-- ��'--rt--rt--t r--�'r-- -
5 - -- -----i--L--------------i--i----L--L-----1--J--1--1--L-- --
4
3
2 ---- -----1--L----1---1---1--J--1--1--i--L--L-------J----1--L--L--
1 I I I I I I I I I I I I I I I I I I I I
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 19
Hydrograph for Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.41
0.00
0.00
10.00
0.51
0.00
0.00
11.00
0.66
0.00
0.00
12.00
1.86
0.24
13.86
13.00
2.17
0.37
1.04
14.00
2.30
0.43
0.65
15.00
2.40
0.48
0.54
16.00
2.47
0.51
0.42
17.00
2.53
0.55
0.38
18.00
2.59
0.57
0.34
19.00
2.64
0.60
0.30
20.00
2.68
0.62
0.25
21.00
2.71
0.64
0.24
22.00
2.75
0.66
0.24
23.00
2.78
0.68
0.23
24.00
2.81
0.70
0.22
25.00
2.81
0.70
0.00
26.00
2.81
0.70
0.00
27.00
2.81
0.70
0.00
28.00
2.81
0.70
0.00
29.00
2.81
0.70
0.00
30.00
2.81
0.70
0.00
31.00
2.81
0.70
0.00
32.00
2.81
0.70
0.00
33.00
2.81
0.70
0.00
34.00
2.81
0.70
0.00
35.00
2.81
0.70
0.00
36.00
2.81
0.70
0.00
37.00
2.81
0.70
0.00
38.00
2.81
0.70
0.00
39.00
2.81
0.70
0.00
40.00
2.81
0.70
0.00
41.00
2.81
0.70
0.00
42.00
2.81
0.70
0.00
43.00
2.81
0.70
0.00
44.00
2.81
0.70
0.00
45.00
2.81
0.70
0.00
46.00
2.81
0.70
0.00
47.00
2.81
0.70
0.00
48.00
2.81
0.70
0.00
49.00
2.81
0.70
0.00
50.00
2.81
0.70
0.00
51.00
2.81
0.70
0.00
52.00
2.81
0.70
0.00
53.00
2.81
0.70
0.00
54.00
2.81
0.70
0.00
55.00
2.81
0.70
0.00
56.00
2.81
0.70
0.00
57.00
2.81
0.70
0.00
58.00
2.81
0.70
0.00
59.00
2.81
0.70
0.00
60.00
2.81
0.70
0.00
61.00
2.81
0.70
0.00
62.00
2.81
0.70
0.00
63.00
2.81
0.70
0.00
64.00
2.81
0.70
0.00
65.00
2.81
0.70
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
0.70
0.00
67.00
2.81
0.70
0.00
68.00
2.81
0.70
0.00
69.00
2.81
0.70
0.00
70.00
2.81
0.70
0.00
71.00
2.81
0.70
0.00
72.00
2.81
0.70
0.00
73.00
2.81
0.70
0.00
74.00
2.81
0.70
0.00
75.00
2.81
0.70
0.00
76.00
2.81
0.70
0.00
77.00
2.81
0.70
0.00
78.00
2.81
0.70
0.00
79.00
2.81
0.70
0.00
80.00
2.81
0.70
0.00
81.00
2.81
0.70
0.00
82.00
2.81
0.70
0.00
83.00
2.81
0.70
0.00
84.00
2.81
0.70
0.00
85.00
2.81
0.70
0.00
86.00
2.81
0.70
0.00
87.00
2.81
0.70
0.00
88.00
2.81
0.70
0.00
89.00
2.81
0.70
0.00
90.00
2.81
0.70
0.00
91.00
2.81
0.70
0.00
92.00
2.81
0.70
0.00
93.00
2.81
0.70
0.00
94.00
2.81
0.70
0.00
95.00
2.81
0.70
0.00
96.00
2.81
0.70
0.00
97.00
2.81
0.70
0.00
98.00
2.81
0.70
0.00
99.00
2.81
0.70
0.00
100.00
2.81
0.70
0.00
101.00
2.81
0.70
0.00
102.00
2.81
0.70
0.00
103.00
2.81
0.70
0.00
104.00
2.81
0.70
0.00
105.00
2.81
0.70
0.00
106.00
2.81
0.70
0.00
107.00
2.81
0.70
0.00
108.00
2.81
0.70
0.00
109.00
2.81
0.70
0.00
110.00
2.81
0.70
0.00
111.00
2.81
0.70
0.00
112.00
2.81
0.70
0.00
113.00
2.81
0.70
0.00
114.00
2.81
0.70
0.00
115.00
2.81
0.70
0.00
116.00
2.81
0.70
0.00
117.00
2.81
0.70
0.00
118.00
2.81
0.70
0.00
119.00
2.81
0.70
0.00
120.00
2.81
0.70
0.00

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 20
Summary for Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Runoff = 1.22 cfs @ 12.26 hrs, Volume= 0.265 af, Depth= 0.22"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac)
CN
Description
7.730
55
Woods, Good, HSG B
7.000
61
>75% Grass cover, Good, HSG B
14.730
58
Weighted Average
14.730
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Hydrograph
� � � � � � �� �� � � � � �� �� �� �� �� �� � � � � � ❑Runoff
1.22 cfs
Type 11'; 24-h';r
Runoff Arch=14.730 at
R4npff';VQ10me=',0.26$ calf
Runoff off ' D e pt h TO . 22';"
3 F16'� LOngth=1,16a'
0 W
Tc=�1.',9 mip
OWSIB
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 21
Hydrograph for Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.41
0.00
0.00
10.00
0.51
0.00
0.00
11.00
0.66
0.00
0.00
12.00
1.86
0.02
0.11
13.00
2.17
0.07
0.54
14.00
2.30
0.09
0.35
15.00
2.40
0.11
0.29
16.00
2.47
0.13
0.24
17.00
2.53
0.14
0.21
18.00
2.59
0.15
0.20
19.00
2.64
0.17
0.18
20.00
2.68
0.18
0.15
21.00
2.71
0.19
0.14
22.00
2.75
0.20
0.14
23.00
2.78
0.21
0.14
24.00
2.81
0.22
0.14
25.00
2.81
0.22
0.00
26.00
2.81
0.22
0.00
27.00
2.81
0.22
0.00
28.00
2.81
0.22
0.00
29.00
2.81
0.22
0.00
30.00
2.81
0.22
0.00
31.00
2.81
0.22
0.00
32.00
2.81
0.22
0.00
33.00
2.81
0.22
0.00
34.00
2.81
0.22
0.00
35.00
2.81
0.22
0.00
36.00
2.81
0.22
0.00
37.00
2.81
0.22
0.00
38.00
2.81
0.22
0.00
39.00
2.81
0.22
0.00
40.00
2.81
0.22
0.00
41.00
2.81
0.22
0.00
42.00
2.81
0.22
0.00
43.00
2.81
0.22
0.00
44.00
2.81
0.22
0.00
45.00
2.81
0.22
0.00
46.00
2.81
0.22
0.00
47.00
2.81
0.22
0.00
48.00
2.81
0.22
0.00
49.00
2.81
0.22
0.00
50.00
2.81
0.22
0.00
51.00
2.81
0.22
0.00
52.00
2.81
0.22
0.00
53.00
2.81
0.22
0.00
54.00
2.81
0.22
0.00
55.00
2.81
0.22
0.00
56.00
2.81
0.22
0.00
57.00
2.81
0.22
0.00
58.00
2.81
0.22
0.00
59.00
2.81
0.22
0.00
60.00
2.81
0.22
0.00
61.00
2.81
0.22
0.00
62.00
2.81
0.22
0.00
63.00
2.81
0.22
0.00
64.00
2.81
0.22
0.00
65.00
2.81
0.22
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
0.22
0.00
67.00
2.81
0.22
0.00
68.00
2.81
0.22
0.00
69.00
2.81
0.22
0.00
70.00
2.81
0.22
0.00
71.00
2.81
0.22
0.00
72.00
2.81
0.22
0.00
73.00
2.81
0.22
0.00
74.00
2.81
0.22
0.00
75.00
2.81
0.22
0.00
76.00
2.81
0.22
0.00
77.00
2.81
0.22
0.00
78.00
2.81
0.22
0.00
79.00
2.81
0.22
0.00
80.00
2.81
0.22
0.00
81.00
2.81
0.22
0.00
82.00
2.81
0.22
0.00
83.00
2.81
0.22
0.00
84.00
2.81
0.22
0.00
85.00
2.81
0.22
0.00
86.00
2.81
0.22
0.00
87.00
2.81
0.22
0.00
88.00
2.81
0.22
0.00
89.00
2.81
0.22
0.00
90.00
2.81
0.22
0.00
91.00
2.81
0.22
0.00
92.00
2.81
0.22
0.00
93.00
2.81
0.22
0.00
94.00
2.81
0.22
0.00
95.00
2.81
0.22
0.00
96.00
2.81
0.22
0.00
97.00
2.81
0.22
0.00
98.00
2.81
0.22
0.00
99.00
2.81
0.22
0.00
100.00
2.81
0.22
0.00
101.00
2.81
0.22
0.00
102.00
2.81
0.22
0.00
103.00
2.81
0.22
0.00
104.00
2.81
0.22
0.00
105.00
2.81
0.22
0.00
106.00
2.81
0.22
0.00
107.00
2.81
0.22
0.00
108.00
2.81
0.22
0.00
109.00
2.81
0.22
0.00
110.00
2.81
0.22
0.00
111.00
2.81
0.22
0.00
112.00
2.81
0.22
0.00
113.00
2.81
0.22
0.00
114.00
2.81
0.22
0.00
115.00
2.81
0.22
0.00
116.00
2.81
0.22
0.00
117.00
2.81
0.22
0.00
118.00
2.81
0.22
0.00
119.00
2.81
0.22
0.00
120.00
2.81
0.22
0.00

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 22
Summary for Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Runoff = 0.40 cfs @ 12.25 hrs, Volume= 0.076 af, Depth= 0.24"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr-24hr Rainfall=2.81"
Area (ac)
CN
Description
3.190
55
Woods, Good, HSG B
0.580
78
Row crops, straight row, Good, HSG B
3.770
59
Weighted Average
3.770
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Hydrograph
-------;---------- --;--------;-- ----------- ---------
0.44-L--L-------J--L--L--L-----'-- --L--L----------L--L--L--'--
0.42 0.40 -- -----I-- -- --+--+-----I-- -- ----------I----+--r--I--
0.4 -- - - --,------- -,-- -- +--,-----,-- -- +--, --, __Ty���1 24-- r
0.38--'---- --'-----'---- --' --'-----'---- --' --'--- �/ -
0.36 --'----L--L--'---'-- -- --+----'---'lyr;24ir_Rairtfa1 2.917-
0.32 --,-- -------------li-- ----------li-- R1.1�f /'AI�i�3./'�V �It
0.3 j ---- -- --------- -- --L-------'--L-+--L--------'--���--L--L--I-{-
0.28 --�-- +--+--+-------+--+--+--+---- "Y•• [qme 0.-0 cjI
0.26 ---- +--+--r--r--i--+--+--+--r--r--i--+--+--r--r--i---i--+--+--r--r-
u 0.24 --; - -- ; --; --; ---- -- -- ; --; --; ---- ' --Run D pth=� 4 -
3 0.22 --'----L--L--'---'------L--L--'-------L--L------------L--L--'--
F]A6W� L4n#0th_11t6T
O
0.18 -- - -1 _F F 1--7--+--r--I---1---1--+--r-- ---- -r----
0.16 --,-- ---------------- ------------ ----------�Tlp=�-.9�111-
0.14 --'----L--L-------J--L--L--L-----'----L--L-----'---'--L- L ' -
0.12
��-
0.1 - -i
0.08 --'-- --'--'---'---'---'---'--'---'---'---'---'---'--'---'---'---'---'--'---'---'--
0.06 --'-- - -L--1---1--J--1--1--L--1---'--L--+--L----------L--+--L--'--
0.04 - ---
-+- r--r--+-+--+--+--r--r--i--+--+--r--r--+--i--+--+--r--r-
0.02
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)
■ Runoff

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 23
Hydrograph for Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.13
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.22
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.41
0.00
0.00
10.00
0.51
0.00
0.00
11.00
0.66
0.00
0.00
12.00
1.86
0.03
0.04
13.00
2.17
0.08
0.15
14.00
2.30
0.11
0.10
15.00
2.40
0.13
0.08
16.00
2.47
0.15
0.07
17.00
2.53
0.16
0.06
18.00
2.59
0.18
0.05
19.00
2.64
0.19
0.05
20.00
2.68
0.20
0.04
21.00
2.71
0.21
0.04
22.00
2.75
0.22
0.04
23.00
2.78
0.23
0.04
24.00
2.81
0.24
0.04
25.00
2.81
0.24
0.00
26.00
2.81
0.24
0.00
27.00
2.81
0.24
0.00
28.00
2.81
0.24
0.00
29.00
2.81
0.24
0.00
30.00
2.81
0.24
0.00
31.00
2.81
0.24
0.00
32.00
2.81
0.24
0.00
33.00
2.81
0.24
0.00
34.00
2.81
0.24
0.00
35.00
2.81
0.24
0.00
36.00
2.81
0.24
0.00
37.00
2.81
0.24
0.00
38.00
2.81
0.24
0.00
39.00
2.81
0.24
0.00
40.00
2.81
0.24
0.00
41.00
2.81
0.24
0.00
42.00
2.81
0.24
0.00
43.00
2.81
0.24
0.00
44.00
2.81
0.24
0.00
45.00
2.81
0.24
0.00
46.00
2.81
0.24
0.00
47.00
2.81
0.24
0.00
48.00
2.81
0.24
0.00
49.00
2.81
0.24
0.00
50.00
2.81
0.24
0.00
51.00
2.81
0.24
0.00
52.00
2.81
0.24
0.00
53.00
2.81
0.24
0.00
54.00
2.81
0.24
0.00
55.00
2.81
0.24
0.00
56.00
2.81
0.24
0.00
57.00
2.81
0.24
0.00
58.00
2.81
0.24
0.00
59.00
2.81
0.24
0.00
60.00
2.81
0.24
0.00
61.00
2.81
0.24
0.00
62.00
2.81
0.24
0.00
63.00
2.81
0.24
0.00
64.00
2.81
0.24
0.00
65.00
2.81
0.24
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
2.81
0.24
0.00
67.00
2.81
0.24
0.00
68.00
2.81
0.24
0.00
69.00
2.81
0.24
0.00
70.00
2.81
0.24
0.00
71.00
2.81
0.24
0.00
72.00
2.81
0.24
0.00
73.00
2.81
0.24
0.00
74.00
2.81
0.24
0.00
75.00
2.81
0.24
0.00
76.00
2.81
0.24
0.00
77.00
2.81
0.24
0.00
78.00
2.81
0.24
0.00
79.00
2.81
0.24
0.00
80.00
2.81
0.24
0.00
81.00
2.81
0.24
0.00
82.00
2.81
0.24
0.00
83.00
2.81
0.24
0.00
84.00
2.81
0.24
0.00
85.00
2.81
0.24
0.00
86.00
2.81
0.24
0.00
87.00
2.81
0.24
0.00
88.00
2.81
0.24
0.00
89.00
2.81
0.24
0.00
90.00
2.81
0.24
0.00
91.00
2.81
0.24
0.00
92.00
2.81
0.24
0.00
93.00
2.81
0.24
0.00
94.00
2.81
0.24
0.00
95.00
2.81
0.24
0.00
96.00
2.81
0.24
0.00
97.00
2.81
0.24
0.00
98.00
2.81
0.24
0.00
99.00
2.81
0.24
0.00
100.00
2.81
0.24
0.00
101.00
2.81
0.24
0.00
102.00
2.81
0.24
0.00
103.00
2.81
0.24
0.00
104.00
2.81
0.24
0.00
105.00
2.81
0.24
0.00
106.00
2.81
0.24
0.00
107.00
2.81
0.24
0.00
108.00
2.81
0.24
0.00
109.00
2.81
0.24
0.00
110.00
2.81
0.24
0.00
111.00
2.81
0.24
0.00
112.00
2.81
0.24
0.00
113.00
2.81
0.24
0.00
114.00
2.81
0.24
0.00
115.00
2.81
0.24
0.00
116.00
2.81
0.24
0.00
117.00
2.81
0.24
0.00
118.00
2.81
0.24
0.00
119.00
2.81
0.24
0.00
120.00
2.81
0.24
0.00

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 24
Summary for Pond 2P: POND 2
Inflow Area = 27.080 ac, 79.03% Impervious, Inflow Depth = 1.81" for lyr-24hr event
Inflow = 86.08 cfs @ 11.95 hrs, Volume= 4.086 of
Outflow = 1.99 cfs @ 15.19 hrs, Volume= 4.074 af, Atten= 98%, Lag= 193.9 min
Primary = 1.99 cfs @ 15.19 hrs, Volume= 4.074 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 714.67' @ 15.19 hrs Surf.Area= 29,232 sf Storage= 115,875 cf
Plug -Flow detention time= 756.0 min calculated for 4.074 of (100% of inflow)
Center -of -Mass det. time= 754.3 min ( 1,562.3 - 808.0 )
Volume Invert
Avail.Storage Storage Description
#1 710.00'
301,329 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
710.00
20,568
0 0
711.00
22,310
21,439 21,439
712.00
24,113
23,212 44,651
713.00
25,975
25,044 69,695
714.00
27,897
26,936 96,631
715.00
29,879
28,888 125,519
716.00
31,920
30,900 156,418
717.00
34,021
32,971 189,389
718.00
36,183
35,102 224,491
719.00
38,404
37,294 261,784
720.00
40,686
39,545 301,329
Device Routing
Invert
Outlet Devices
#1 Primary
709.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 709.39' / 709.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
710.00'
6.0" Vert. 6" Orifice C= 0.600
#3 Device 1
715.00'
36.0" W x 6.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1
718.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
718.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=1.99 cfs @ 15.19 hrs HW=714.67' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 1.99 cfs of 31.31 cfs potential flow)
2=6" Orifice (Orifice Controls 1.99 cfs @ 10.13 fps)
3=Orifice/Grate ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=710.00' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 25
'0 i glPAA14i
Hydrograph
-�--L-J--L--1--1--1--1--I--1--I--�--L-1--L-J--L--1--L--1--1--I--1--
,I
86.08
I I I
cfs
I
+--I--+--I--+--I--+--I--+--+-+--+-+--+--I--+--I--+--I--+--
I I
I I
I I I
-- ----
I
I
-
I I I I I I I I I I
-- ---.rrr�----r---/�-Tp-/�-I--7-
■Inflow
■ outflow
' �I -
-
------II--
r----T----T--I--
--II--
----?--II--
-E�i#�o
�1 1=27.VV0 ac -
■ Primary
95
-�-
I
J--L--1--1--1--1--I--1--I--�--L-�--L-J--L--I--L--I--L--I--1-
G
■Secondary
90
_
85
80
-
-
-I--
--I--
--I--
--I--
--II -
--II
--,$torage;F
}} QI
krl--
75
7sr'-
70
-
-
--
--I--
--I--
--I--
--I--
--
-
-- - -- --I-- --I-- --I-- -
65
-Y-
60
w 55
-�-
I
I
7------T----T----7----7--------------------�--
I
I I
I I
I I I
I
I
I I I I I I I I I I
�
50
'I
J--L--1--1----1----1--I--
3 45
-
'I
-
Y--Y--I--t--I--t--I--Y--r-Y--r-�--r-Y--r--I--Y--I--t--I--Y--
--L-1--L-J--L----L----1--1--1-
LL 40
35
30
-
-
J--L--1--1--1--1----1--I--
--L-1--L-J--L----L----1--1--1-
25
20
,s
1.99
cfs
0.00
cfs
0
0
5 10 15
20 25
30
35
40 45
50 55
60 65 70
75
80
85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 2P: POND 2
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
710.00
0.00
0.00
0.00
2.50
0.00
0
710.00
0.00
0.00
0.00
5.00
0.00
0
710.00
0.00
0.00
0.00
7.50
0.21
529
710.03
0.00
0.00
0.00
10.00
1.07
5,051
710.24
0.16
0.16
0.00
12.50
6.87
103,711
714.25
1.89
1.89
0.00
15.00
2.07
115,847
714.67
1.99
1.99
0.00
17.50
1.34
112,558
714.56
1.96
1.96
0.00
20.00
0.91
105,270
714.31
1.90
1.90
0.00
22.50
0.82
96,235
713.99
1.83
1.83
0.00
25.00
0.00
84,704
713.57
1.72
1.72
0.00
27.50
0.00
69,888
713.01
1.57
1.57
0.00
30.00
0.00
56,464
712.48
1.41
1.41
0.00
32.50
0.00
44,488
711.99
1.25
1.25
0.00
35.00
0.00
34,013
711.55
1.08
1.08
0.00
37.50
0.00
25,092
711.16
0.90
0.90
0.00
40.00
0.00
17,771
710.83
0.72
0.72
0.00
42.50
0.00
12,094
710.57
0.54
0.54
0.00
45.00
0.00
8,094
710.39
0.35
0.35
0.00
47.50
0.00
5,719
710.27
0.20
0.20
0.00
50.00
0.00
4,326
710.21
0.12
0.12
0.00
52.50
0.00
3,445
710.17
0.08
0.08
0.00
55.00
0.00
2,847
710.14
0.06
0.06
0.00
57.50
0.00
2,419
710.12
0.04
0.04
0.00
60.00
0.00
2,099
710.10
0.03
0.03
0.00
62.50
0.00
1,851
710.09
0.02
0.02
0.00
65.00
0.00
1,655
710.08
0.02
0.02
0.00
67.50
0.00
1,495
710.07
0.02
0.02
0.00
70.00
0.00
1,362
710.07
0.01
0.01
0.00
72.50
0.00
1,251
710.06
0.01
0.01
0.00
75.00
0.00
1,156
710.06
0.01
0.01
0.00
77.50
0.00
1,075
710.05
0.01
0.01
0.00
80.00
0.00
1,003
710.05
0.01
0.01
0.00
82.50
0.00
941
710.05
0.01
0.01
0.00
85.00
0.00
886
710.04
0.01
0.01
0.00
87.50
0.00
837
710.04
0.01
0.01
0.00
90.00
0.00
793
710.04
0.00
0.00
0.00
92.50
0.00
753
710.04
0.00
0.00
0.00
95.00
0.00
717
710.03
0.00
0.00
0.00
97.50
0.00
684
710.03
0.00
0.00
0.00
100.00
0.00
654
710.03
0.00
0.00
0.00
102.50
0.00
627
710.03
0.00
0.00
0.00
105.00
0.00
602
710.03
0.00
0.00
0.00
107.50
0.00
578
710.03
0.00
0.00
0.00
110.00
0.00
557
710.03
0.00
0.00
0.00
112.50
0.00
537
710.03
0.00
0.00
0.00
115.00
0.00
518
710.03
0.00
0.00
0.00
117.50
0.00
501
710.02
0.00
0.00
0.00
120.00
0.00
484
710.02
0.00
0.00
0.00
Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 27
Stage -Discharge for Pond 2P: POND 2
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
710.00
0.00
0.00
0.00
710.10
0.03
0.03
0.00
710.20
0.11
0.11
0.00
710.30
0.23
0.23
0.00
710.40
0.36
0.36
0.00
710.50
0.47
0.47
0.00
710.60
0.56
0.56
0.00
710.70
0.63
0.63
0.00
710.80
0.70
0.70
0.00
710.90
0.76
0.76
0.00
711.00
0.82
0.82
0.00
711.10
0.87
0.87
0.00
711.20
0.92
0.92
0.00
711.30
0.97
0.97
0.00
711.40
1.01
1.01
0.00
711.50
1.06
1.06
0.00
711.60
1.10
1.10
0.00
711.70
1.14
1.14
0.00
711.80
1.18
1.18
0.00
711.90
1.21
1.21
0.00
712.00
1.25
1.25
0.00
712.10
1.29
1.29
0.00
712.20
1.32
1.32
0.00
712.30
1.35
1.35
0.00
712.40
1.39
1.39
0.00
712.50
1.42
1.42
0.00
712.60
1.45
1.45
0.00
712.70
1.48
1.48
0.00
712.80
1.51
1.51
0.00
712.90
1.54
1.54
0.00
713.00
1.57
1.57
0.00
713.10
1.60
1.60
0.00
713.20
1.62
1.62
0.00
713.30
1.65
1.65
0.00
713.40
1.68
1.68
0.00
713.50
1.70
1.70
0.00
713.60
1.73
1.73
0.00
713.70
1.76
1.76
0.00
713.80
1.78
1.78
0.00
713.90
1.81
1.81
0.00
714.00
1.83
1.83
0.00
714.10
1.86
1.86
0.00
714.20
1.88
1.88
0.00
714.30
1.90
1.90
0.00
714.40
1.93
1.93
0.00
714.50
1.95
1.95
0.00
714.60
1.97
1.97
0.00
714.70
1.99
1.99
0.00
714.80
2.02
2.02
0.00
714.90
2.04
2.04
0.00
715.00
2.06
2.06
0.00
715.10
3.00
3.00
0.00
715.20
4.69
4.69
0.00
715.30
6.87
6.87
0.00
715.40
9.45
9.45
0.00
715.50
12.38
12.38
0.00
715.60
14.70
14.70
0.00
715.70
16.54
16.54
0.00
715.80
18.15
18.15
0.00
715.90
19.61
19.61
0.00
716.00
20.94
20.94
0.00
716.10
22.19
22.19
0.00
716.20
23.36
23.36
0.00
716.30
24.47
24.47
0.00
716.40
25.53
25.53
0.00
716.50
26.55
26.55
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
716.60
27.52
27.52
0.00
716.70
28.46
28.46
0.00
716.80
29.37
29.37
0.00
716.90
30.24
30.24
0.00
717.00
31.10
31.10
0.00
717.10
31.92
31.92
0.00
717.20
32.73
32.73
0.00
717.30
33.51
33.51
0.00
717.40
34.28
34.28
0.00
717.50
35.03
35.03
0.00
717.60
35.76
35.76
0.00
717.70
36.48
36.48
0.00
717.80
37.18
37.18
0.00
717.90
37.87
37.87
0.00
718.00
38.55
38.55
0.00
718.10
40.87
40.87
0.00
718.20
42.27
42.27
0.00
718.30
42.54
42.54
0.00
718.40
42.81
42.81
0.00
718.50
43.08
43.08
0.00
718.60
44.13
43.34
0.79
718.70
45.83
43.61
2.23
718.80
48.02
43.87
4.15
718.90
50.60
44.13
6.48
719.00
53.68
44.39
9.30
719.10
57.19
44.64
12.55
719.20
60.68
44.90
15.78
719.30
64.40
45.15
19.25
719.40
68.33
45.41
22.92
719.50
72.46
45.66
26.80
719.60
76.88
45.91
30.98
719.70
81.52
46.16
35.36
719.80
86.13
46.40
39.72
719.90
90.88
46.65
44.23
720.00
95.67
46.89
48.78

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 28
Stage -Area -Storage for Pond 2P: POND 2
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
710.00
20,568
0
710.10
20,742
2,066
710.20
20,916
4,148
710.30
21,091
6,249
710.40
21,265
8,367
710.50
21,439
10,502
710.60
21,613
12,654
710.70
21,787
14,824
710.80
21,962
17,012
710.90
22,136
19,217
711.00
22,310
21,439
711.10
22,490
23,679
711.20
22,671
25,937
711.30
22,851
28,213
711.40
23,031
30,507
711.50
23,212
32,819
711.60
23,392
35,150
711.70
23,572
37,498
711.80
23,752
39,864
711.90
23,933
42,248
712.00
24,113
44,651
712.10
24,299
47,071
712.20
24,485
49,510
712.30
24,672
51,968
712.40
24,858
54,445
712.50
25,044
56,940
712.60
25,230
59,453
712.70
25,416
61,986
712.80
25,603
64,537
712.90
25,789
67,106
713.00
25,975
69,695
713.10
26,167
72,302
713.20
26,359
74,928
713.30
26,552
77,573
713.40
26,744
80,238
713.50
26,936
82,922
713.60
27,128
85,625
713.70
27,320
88,348
713.80
27,513
91,090
713.90
27,705
93,850
714.00
27,897
96,631
714.10
28,095
99,430
714.20
28,293
102,250
714.30
28,492
105,089
714.40
28,690
107,948
714.50
28,888
110,827
714.60
29,086
113,725
714.70
29,284
116,644
714.80
29,483
119,582
714.90
29,681
122,541
715.00
29,879
125,519
715.10
30,083
128,517
715.20
30,287
131,535
715.30
30,491
134,574
715.40
30,695
137,633
715.50
30,900
140,713
715.60
31,104
143,813
715.70
31,308
146,934
715.80
31,512
150,075
715.90
31,716
153,236
716.00
31,920
156,418
716.10
32,130
159,621
716.20
32,340
162,844
716.30
32,550
166,089
716.40
32,760
169,354
716.50
32.971
172.641
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
716.60
33,181
175,948
716.70
33,391
179,277
716.80
33,601
182,626
716.90
33,811
185,997
717.00
34,021
189,389
717.10
34,237
192,801
717.20
34,453
196,236
717.30
34,670
199,692
717.40
34,886
203,170
717.50
35,102
206,669
717.60
35,318
210,190
717.70
35,534
213,733
717.80
35,751
217,297
717.90
35,967
220,883
718.00
36,183
224,491
718.10
36,405
228,120
718.20
36,627
231,772
718.30
36,849
235,445
718.40
37,071
239,141
718.50
37,294
242,860
718.60
37,516
246,600
718.70
37,738
250,363
718.80
37,960
254,148
718.90
38,182
257,955
719.00
38,404
261,784
719.10
38,632
265,636
719.20
38,860
269,510
719.30
39,089
273,408
719.40
39,317
277,328
719.50
39,545
281,271
719.60
39,773
285,237
719.70
40,001
289,226
719.80
40,230
293,237
719.90
40,458
297,272
720.00
40,686
301,329

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 29
Summary for Pond 8P: POND 3
Inflow Area = 15.260 ac, 72.15% Impervious, Inflow Depth = 1.65" for lyr-24hr event
Inflow = 44.76 cfs @ 11.96 hrs, Volume= 2.099 of
Outflow = 1.55 cfs @ 13.78 hrs, Volume= 2.063 af, Atten= 97%, Lag= 109.2 min
Primary = 1.55 cfs @ 13.78 hrs, Volume= 2.063 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 703.19' @ 13.78 hrs Surf.Area= 49,195 sf Storage= 55,249 cf
Plug -Flow detention time= 622.7 min calculated for 2.063 of (98% of inflow)
Center -of -Mass det. time= 612.5 min ( 1,429.0 - 816.5 )
Volume Invert
Avail.Storage Storage Description
#1 702.00'
503,002 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
702.00
43,792
0 0
703.00
48,320
46,056 46,056
704.00
52,961
50,641 96,697
705.00
57,717
55,339 152,036
706.00
62,582
60,150 212,185
707.00
67,552
65,067 277,252
708.00
72,628
70,090 347,342
709.00
77,809
75,219 422,561
710.00
83,074
80,442 503,002
Device Routing
Invert
Outlet Devices
#1 Primary
701.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 701.39' / 701.00' S= 0.0050 T Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
702.00'
8.0" Vert. 8" Orifice C= 0.600
#3 Device 1
705.00'
36.0" W x 6.0" H Vert. Orifice/Grate X 2.00 C= 0.600
#4 Device 1
708.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
708.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=1.55 cfs @ 13.78 hrs HW=703.19' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 1.55 cfs of 11.24 cfs potential flow)
2=8" Orifice (Orifice Controls 1.55 cfs @ 4.45 fps)
3=Orifice/Grate ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=702.00' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD® 10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 30
'0=6 1 E:iAZORIII&I
.....
• �1
• • 4' cfI
•
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/7//%///%////%////////////////////////////////////////////////////////////
-��-�%////////////////---------------------------------------------------------------------------

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 8P: POND 3
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
702.00
0.00
0.00
0.00
2.50
0.00
0
702.00
0.00
0.00
0.00
5.00
0.00
0
702.00
0.00
0.00
0.00
7.50
0.04
35
702.00
0.00
0.00
0.00
10.00
0.44
1,790
702.04
0.01
0.01
0.00
12.50
3.67
51,983
703.12
1.49
1.49
0.00
15.00
1.12
54,097
703.17
1.53
1.53
0.00
17.50
0.72
48,588
703.05
1.43
1.43
0.00
20.00
0.50
41,880
702.91
1.28
1.28
0.00
22.50
0.45
35,307
702.78
1.12
1.12
0.00
25.00
0.00
28,484
702.63
0.92
0.92
0.00
27.50
0.00
21,508
702.48
0.63
0.63
0.00
30.00
0.00
16,818
702.38
0.42
0.42
0.00
32.50
0.00
13,624
702.31
0.29
0.29
0.00
35.00
0.00
11,366
702.26
0.21
0.21
0.00
37.50
0.00
9,708
702.22
0.16
0.16
0.00
40.00
0.00
8,447
702.19
0.12
0.12
0.00
42.50
0.00
7,463
702.17
0.10
0.10
0.00
45.00
0.00
6,675
702.15
0.08
0.08
0.00
47.50
0.00
6,031
702.14
0.06
0.06
0.00
50.00
0.00
5,497
702.12
0.05
0.05
0.00
52.50
0.00
5,047
702.11
0.05
0.05
0.00
55.00
0.00
4,663
702.11
0.04
0.04
0.00
57.50
0.00
4,331
702.10
0.03
0.03
0.00
60.00
0.00
4,043
702.09
0.03
0.03
0.00
62.50
0.00
3,790
702.09
0.03
0.03
0.00
65.00
0.00
3,566
702.08
0.02
0.02
0.00
67.50
0.00
3,366
702.08
0.02
0.02
0.00
70.00
0.00
3,187
702.07
0.02
0.02
0.00
72.50
0.00
3,026
702.07
0.02
0.02
0.00
75.00
0.00
2,880
702.07
0.02
0.02
0.00
77.50
0.00
2,747
702.06
0.01
0.01
0.00
80.00
0.00
2,626
702.06
0.01
0.01
0.00
82.50
0.00
2,515
702.06
0.01
0.01
0.00
85.00
0.00
2,413
702.05
0.01
0.01
0.00
87.50
0.00
2,318
702.05
0.01
0.01
0.00
90.00
0.00
2,231
702.05
0.01
0.01
0.00
92.50
0.00
2,150
702.05
0.01
0.01
0.00
95.00
0.00
2,074
702.05
0.01
0.01
0.00
97.50
0.00
2,004
702.05
0.01
0.01
0.00
100.00
0.00
1,938
702.04
0.01
0.01
0.00
102.50
0.00
1,876
702.04
0.01
0.01
0.00
105.00
0.00
1,818
702.04
0.01
0.01
0.00
107.50
0.00
1,764
702.04
0.01
0.01
0.00
110.00
0.00
1,712
702.04
0.01
0.01
0.00
112.50
0.00
1,664
702.04
0.01
0.01
0.00
115.00
0.00
1,618
702.04
0.00
0.00
0.00
117.50
0.00
1,575
702.04
0.00
0.00
0.00
120.00
0.00
1,534
702.03
0.00
0.00
0.00
Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 32
Stage -Discharge for Pond 8P: POND 3
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
702.00
0.00
0.00
0.00
702.10
0.04
0.04
0.00
702.20
0.13
0.13
0.00
702.30
0.28
0.28
0.00
702.40
0.47
0.47
0.00
702.50
0.68
0.68
0.00
702.60
0.87
0.87
0.00
702.70
1.02
1.02
0.00
702.80
1.15
1.15
0.00
702.90
1.27
1.27
0.00
703.00
1.37
1.37
0.00
703.10
1.47
1.47
0.00
703.20
1.56
1.56
0.00
703.30
1.65
1.65
0.00
703.40
1.74
1.74
0.00
703.50
1.82
1.82
0.00
703.60
1.89
1.89
0.00
703.70
1.96
1.96
0.00
703.80
2.04
2.04
0.00
703.90
2.10
2.10
0.00
704.00
2.17
2.17
0.00
704.10
2.23
2.23
0.00
704.20
2.30
2.30
0.00
704.30
2.36
2.36
0.00
704.40
2.42
2.42
0.00
704.50
2.47
2.47
0.00
704.60
2.53
2.53
0.00
704.70
2.59
2.59
0.00
704.80
2.64
2.64
0.00
704.90
2.69
2.69
0.00
705.00
2.74
2.74
0.00
705.10
3.40
3.40
0.00
705.20
4.57
4.57
0.00
705.30
6.06
6.06
0.00
705.40
7.82
7.82
0.00
705.50
9.80
9.80
0.00
705.60
11.38
11.38
0.00
705.70
12.64
12.64
0.00
705.80
13.75
13.75
0.00
705.90
14.75
14.75
0.00
706.00
15.67
15.67
0.00
706.10
16.53
16.53
0.00
706.20
17.34
17.34
0.00
706.30
18.11
18.11
0.00
706.40
18.85
18.85
0.00
706.50
19.55
19.55
0.00
706.60
20.23
20.23
0.00
706.70
20.88
20.88
0.00
706.80
21.52
21.52
0.00
706.90
22.13
22.13
0.00
707.00
22.72
22.72
0.00
707.10
23.30
23.30
0.00
707.20
23.87
23.87
0.00
707.30
24.41
24.41
0.00
707.40
24.95
24.95
0.00
707.50
25.48
25.48
0.00
707.60
25.99
25.99
0.00
707.70
26.49
26.49
0.00
707.80
26.99
26.99
0.00
707.90
27.47
27.47
0.00
708.00
27.95
27.95
0.00
708.10
30.07
30.07
0.00
708.20
33.55
33.55
0.00
708.30
36.77
36.77
0.00
708.40
37.08
37.08
0.00
708.50
37.39
37.39
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
708.60
38.48
37.70
0.79
708.70
40.22
38.00
2.23
708.80
42.45
38.30
4.15
708.90
45.07
38.60
6.48
709.00
48.19
38.89
9.30
709.10
51.73
39.18
12.55
709.20
55.26
39.47
15.78
709.30
59.01
39.76
19.25
709.40
62.97
40.05
22.92
709.50
67.13
40.33
26.80
709.60
71.59
40.62
30.98
709.70
76.26
40.90
35.36
709.80
80.90
41.18
39.72
709.90
85.68
41.45
44.23
710.00
90.50
41.73
48.78

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 33
Stage -Area -Storage for Pond 8P: POND 3
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
702.00
43,792
0
702.10
44,245
4,402
702.20
44,698
8,849
702.30
45,150
13,341
702.40
45,603
17,879
702.50
46,056
22,462
702.60
46,509
27,090
702.70
46,962
31,764
702.80
47,414
36,483
702.90
47,867
41,247
703.00
48,320
46,056
703.10
48,784
50,911
703.20
49,248
55,813
703.30
49,712
60,761
703.40
50,176
65,755
703.50
50,641
70,796
703.60
51,105
75,883
703.70
51,569
81,017
703.80
52,033
86,197
703.90
52,497
91,424
704.00
52,961
96,697
704.10
53,437
102,016
704.20
53,912
107,384
704.30
54,388
112,799
704.40
54,863
118,261
704.50
55,339
123,772
704.60
55,815
129,329
704.70
56,290
134,934
704.80
56,766
140,587
704.90
57,241
146,288
705.00
57,717
152,036
705.10
58,204
157,832
705.20
58,690
163,676
705.30
59,176
169,570
705.40
59,663
175,511
705.50
60,150
181,502
705.60
60,636
187,541
705.70
61,123
193,629
705.80
61,609
199,766
705.90
62,095
205,951
706.00
62,582
212,185
706.10
63,079
218,468
706.20
63,576
224,801
706.30
64,073
231,183
706.40
64,570
237,615
706.50
65,067
244,097
706.60
65,564
250,629
706.70
66,061
257,210
706.80
66,558
263,841
706.90
67,055
270,522
707.00
67,552
277,252
707.10
68,060
284,033
707.20
68,567
290,864
707.30
69,075
297,746
707.40
69,582
304,679
707.50
70,090
311,663
707.60
70,598
318,697
707.70
71,105
325,782
707.80
71,613
332,918
707.90
72,120
340,105
708.00
72,628
347,342
708.10
73,146
354,631
708.20
73,664
361,971
708.30
74,182
369,364
708.40
74,700
376,808
708.50
75.219
384.304
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
708.60
75,737
391,851
708.70
76,255
399,451
708.80
76,773
407,102
708.90
77,291
414,806
709.00
77,809
422,561
709.10
78,336
430,368
709.20
78,862
438,228
709.30
79,388
446,140
709.40
79,915
454,105
709.50
80,442
462,123
709.60
80,968
470,194
709.70
81,495
478,317
709.80
82,021
486,492
709.90
82,547
494,721
710.00
83,074
503,002

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 34
Summary for Pond 10P: POND 4
Inflow Area = 10.550 ac, 69.48% Impervious, Inflow Depth = 1.57" for lyr-24hr event
Inflow = 29.66 cfs @ 11.96 hrs, Volume= 1.384 of
Outflow = 2.96 cfs @ 12.40 hrs, Volume= 1.384 af, Atten= 90%, Lag= 26.8 min
Primary = 2.96 cfs @ 12.40 hrs, Volume= 1.384 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 680.44' @ 12.40 hrs Surf.Area= 12,174 sf Storage= 26,350 cf
Plug -Flow detention time= 104.3 min calculated for 1.383 of (100% of inflow)
Center -of -Mass det. time= 105.5 min ( 926.0 - 820.4 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
120,639 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
4,560
0 0
678.00
5,909
5,235 5,235
679.00
7,780
6,845 12,079
680.00
10,667
9,224 21,303
681.00
14,076
12,372 33,674
682.00
17,710
15,893 49,567
683.00
21,571
19,641 69,208
684.00
25,659
23,615 92,823
685.00
29,973
27,816 120,639
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 T Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
677.00'
8.0" Vert. 8" Orifice C= 0.600
#3 Device 1
682.50'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#4 Secondary
683.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=2.96 cfs @ 12.40 hrs HW=680.44' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 2.96 cfs of 25.80 cfs potential flow)
1 2=8" Orifice (Orifice Controls 2.96 cfs @ 8.49 fps)
3=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
4=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 35
'0=6 1 gi[1]A191MI !
.....
• ..
IN Inflow
IN Outflow
�i
• i 1
IN Primary
N Secondary
32
-. 1 ...
2.
LL
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 10P: POND 4
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.00
0
677.00
0.00
0.00
0.00
7.50
0.00
0
677.00
0.00
0.00
0.00
10.00
0.26
751
677.16
0.09
0.09
0.00
12.50
2.46
26,264
680.43
2.96
2.96
0.00
15.00
0.75
13,038
679.12
2.25
2.25
0.00
17.50
0.49
3,508
677.70
1.01
1.01
0.00
20.00
0.34
1,740
677.36
0.40
0.40
0.00
22.50
0.30
1,512
677.32
0.31
0.31
0.00
25.00
0.00
849
677.18
0.11
0.11
0.00
27.50
0.00
379
677.08
0.02
0.02
0.00
30.00
0.00
240
677.05
0.01
0.01
0.00
32.50
0.00
175
677.04
0.01
0.01
0.00
35.00
0.00
137
677.03
0.00
0.00
0.00
37.50
0.00
113
677.02
0.00
0.00
0.00
40.00
0.00
96
677.02
0.00
0.00
0.00
42.50
0.00
83
677.02
0.00
0.00
0.00
45.00
0.00
74
677.02
0.00
0.00
0.00
47.50
0.00
66
677.01
0.00
0.00
0.00
50.00
0.00
60
677.01
0.00
0.00
0.00
52.50
0.00
54
677.01
0.00
0.00
0.00
55.00
0.00
50
677.01
0.00
0.00
0.00
57.50
0.00
46
677.01
0.00
0.00
0.00
60.00
0.00
43
677.01
0.00
0.00
0.00
62.50
0.00
40
677.01
0.00
0.00
0.00
65.00
0.00
38
677.01
0.00
0.00
0.00
67.50
0.00
36
677.01
0.00
0.00
0.00
70.00
0.00
34
677.01
0.00
0.00
0.00
72.50
0.00
32
677.01
0.00
0.00
0.00
75.00
0.00
31
677.01
0.00
0.00
0.00
77.50
0.00
29
677.01
0.00
0.00
0.00
80.00
0.00
28
677.01
0.00
0.00
0.00
82.50
0.00
27
677.01
0.00
0.00
0.00
85.00
0.00
26
677.01
0.00
0.00
0.00
87.50
0.00
25
677.01
0.00
0.00
0.00
90.00
0.00
24
677.01
0.00
0.00
0.00
92.50
0.00
23
677.00
0.00
0.00
0.00
95.00
0.00
22
677.00
0.00
0.00
0.00
97.50
0.00
21
677.00
0.00
0.00
0.00
100.00
0.00
21
677.00
0.00
0.00
0.00
102.50
0.00
20
677.00
0.00
0.00
0.00
105.00
0.00
19
677.00
0.00
0.00
0.00
107.50
0.00
19
677.00
0.00
0.00
0.00
110.00
0.00
18
677.00
0.00
0.00
0.00
112.50
0.00
18
677.00
0.00
0.00
0.00
115.00
0.00
17
677.00
0.00
0.00
0.00
117.50
0.00
17
677.00
0.00
0.00
0.00
120.00
0.00
16
677.00
0.00
0.00
0.00
Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 37
Stage -Discharge for Pond 10P: POND 4
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.13
0.13
0.00
677.30
0.28
0.28
0.00
677.40
0.47
0.47
0.00
677.50
0.68
0.68
0.00
677.60
0.87
0.87
0.00
677.70
1.02
1.02
0.00
677.80
1.15
1.15
0.00
677.90
1.27
1.27
0.00
678.00
1.37
1.37
0.00
678.10
1.47
1.47
0.00
678.20
1.56
1.56
0.00
678.30
1.65
1.65
0.00
678.40
1.74
1.74
0.00
678.50
1.82
1.82
0.00
678.60
1.89
1.89
0.00
678.70
1.96
1.96
0.00
678.80
2.04
2.04
0.00
678.90
2.10
2.10
0.00
679.00
2.17
2.17
0.00
679.10
2.23
2.23
0.00
679.20
2.30
2.30
0.00
679.30
2.36
2.36
0.00
679.40
2.42
2.42
0.00
679.50
2.47
2.47
0.00
679.60
2.53
2.53
0.00
679.70
2.59
2.59
0.00
679.80
2.64
2.64
0.00
679.90
2.69
2.69
0.00
680.00
2.74
2.74
0.00
680.10
2.80
2.80
0.00
680.20
2.85
2.85
0.00
680.30
2.89
2.89
0.00
680.40
2.94
2.94
0.00
680.50
2.99
2.99
0.00
680.60
3.04
3.04
0.00
680.70
3.08
3.08
0.00
680.80
3.13
3.13
0.00
680.90
3.17
3.17
0.00
681.00
3.22
3.22
0.00
681.10
3.26
3.26
0.00
681.20
3.30
3.30
0.00
681.30
3.35
3.35
0.00
681.40
3.39
3.39
0.00
681.50
3.43
3.43
0.00
681.60
3.47
3.47
0.00
681.70
3.51
3.51
0.00
681.80
3.55
3.55
0.00
681.90
3.59
3.59
0.00
682.00
3.63
3.63
0.00
682.10
3.67
3.67
0.00
682.20
3.71
3.71
0.00
682.30
3.75
3.75
0.00
682.40
3.78
3.78
0.00
682.50
3.82
3.82
0.00
682.60
5.51
5.51
0.00
682.70
8.57
8.57
0.00
682.80
12.53
12.53
0.00
682.90
17.20
17.20
0.00
683.00
22.50
22.50
0.00
683.10
28.35
28.35
0.00
683.20
34.71
34.71
0.00
683.30
36.77
36.77
0.00
683.40
37.08
37.08
0.00
683.50
37.39
37.39
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
38.48
37.70
0.79
683.70
40.22
38.00
2.23
683.80
42.45
38.30
4.15
683.90
45.07
38.60
6.48
684.00
48.19
38.89
9.30
684.10
51.73
39.18
12.55
684.20
55.26
39.47
15.78
684.30
59.01
39.76
19.25
684.40
62.97
40.05
22.92
684.50
67.13
40.33
26.80
684.60
71.59
40.62
30.98
684.70
76.26
40.90
35.36
684.80
80.90
41.18
39.72
684.90
85.68
41.45
44.23
685.00
90.50
41.73
48.78

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 38
Stage -Area -Storage for Pond 10P: POND 4
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
4,560
0
677.10
4,695
463
677.20
4,830
939
677.30
4,965
1,429
677.40
5,100
1,932
677.50
5,235
2,449
677.60
5,369
2,979
677.70
5,504
3,523
677.80
5,639
4,080
677.90
5,774
4,650
678.00
5,909
5,235
678.10
6,096
5,835
678.20
6,283
6,454
678.30
6,470
7,091
678.40
6,657
7,748
678.50
6,845
8,423
678.60
7,032
9,117
678.70
7,219
9,829
678.80
7,406
10,560
678.90
7,593
11,310
679.00
7,780
12,079
679.10
8,069
12,871
679.20
8,357
13,693
679.30
8,646
14,543
679.40
8,935
15,422
679.50
9,224
16,330
679.60
9,512
17,267
679.70
9,801
18,232
679.80
10,090
19,227
679.90
10,378
20,250
680.00
10,667
21,303
680.10
11,008
22,386
680.20
11,349
23,504
680.30
11,690
24,656
680.40
12,031
25,842
680.50
12,372
27,062
680.60
12,712
28,316
680.70
13,053
29,605
680.80
13,394
30,927
680.90
13,735
32,283
681.00
14,076
33,674
681.10
14,439
35,100
681.20
14,803
36,562
681.30
15,166
38,060
681.40
15,530
39,595
681.50
15,893
41,166
681.60
16,256
42,774
681.70
16,620
44,418
681.80
16,983
46,098
681.90
17,347
47,814
682.00
17,710
49,567
682.10
18,096
51,357
682.20
18,482
53,186
682.30
18,868
55,054
682.40
19,254
56,960
682.50
19,641
58,905
682.60
20,027
60,888
682.70
20,413
62,910
682.80
20,799
64,971
682.90
21,185
67,070
683.00
21,571
69,208
683.10
21,980
71,385
683.20
22,389
73,603
683.30
22,797
75,863
683.40
23,206
78,163
683.50
23.615
80.504
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
24,024
82,886
683.70
24,433
85,309
683.80
24,841
87,772
683.90
25,250
90,277
684.00
25,659
92,823
684.10
26,090
95,410
684.20
26,522
98,041
684.30
26,953
100,714
684.40
27,385
103,431
684.50
27,816
106,191
684.60
28,247
108,994
684.70
28,679
111,841
684.80
29,110
114,730
684.90
29,542
117,663
685.00
29,973
120,639

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 39
Summary for Pond 11 P: POST - OUTFALL #2
Inflow Area = 67.620 ac, 58.77% Impervious, Inflow Depth > 1.38" for 1yr-24hr event
Inflow = 7.46 cfs @ 12.28 hrs, Volume= 7.786 of
Primary = 7.46 cfs @ 12.28 hrs, Volume= 7.786 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 11 P: POST - OUTFALL #2
Hydrograph
❑ Inflow
8 ❑ Primary
7.46 cfs-11fl,oW-ArelziI1=67,1,620- all; -
T-- T-- ,--T--r
7
- - - -'- - -'- - L - - L - - L - -'- - - - L - - L - -'- - L - - L - - L - -'- - - - L - - L - -'- - L - - L - -
6
s
N --' 1---1--J--1--L--1--�--L--L--'--J--L--L--'--�--L--L--'--J--1--
0 4
— -- --
a T--F 1---1 r--r--r---T----r---r----r---T
-
-
3
2
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 40
Hydrograph for Pond 11 P: POST - OUTFALL #2
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.00
0.00
7.00
0.00
0.00
8.00
0.01
0.01
9.00
0.06
0.06
10.00
0.25
0.25
11.00
0.84
0.84
12.00
5.66
5.66
13.00
6.90
6.90
14.00
6.50
6.50
15.00
6.06
6.06
16.00
5.51
5.51
17.00
4.90
4.90
18.00
4.34
4.34
19.00
3.96
3.96
20.00
3.74
3.74
21.00
3.58
3.58
22.00
3.46
3.46
23.00
3.34
3.34
24.00
3.23
3.23
25.00
2.76
2.76
26.00
2.52
2.52
27.00
2.32
2.32
28.00
2.14
2.14
29.00
1.99
1.99
30.00
1.85
1.85
31.00
1.72
1.72
32.00
1.60
1.60
33.00
1.49
1.49
34.00
1.39
1.39
35.00
1.29
1.29
36.00
1.20
1.20
37.00
1.11
1.11
38.00
1.02
1.02
39.00
0.93
0.93
40.00
0.85
0.85
41.00
0.76
0.76
42.00
0.68
0.68
43.00
0.60
0.60
44.00
0.51
0.51
45.00
0.43
0.43
46.00
0.35
0.35
47.00
0.29
0.29
48.00
0.24
0.24
49.00
0.20
0.20
50.00
0.18
0.18
51.00
0.15
0.15
52.00
0.13
0.13
53.00
0.12
0.12
54.00
0.11
0.11
55.00
0.10
0.10
56.00
0.09
0.09
57.00
0.08
0.08
58.00
0.07
0.07
59.00
0.07
0.07
60.00
0.06
0.06
61.00
0.06
0.06
62.00
0.05
0.05
63.00
0.05
0.05
64.00
0.05
0.05
65.00
0.04
0.04
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.04
0.04
67.00
0.04
0.04
68.00
0.04
0.04
69.00
0.03
0.03
70.00
0.03
0.03
71.00
0.03
0.03
72.00
0.03
0.03
73.00
0.03
0.03
74.00
0.03
0.03
75.00
0.03
0.03
76.00
0.02
0.02
77.00
0.02
0.02
78.00
0.02
0.02
79.00
0.02
0.02
80.00
0.02
0.02
81.00
0.02
0.02
82.00
0.02
0.02
83.00
0.02
0.02
84.00
0.02
0.02
85.00
0.02
0.02
86.00
0.02
0.02
87.00
0.02
0.02
88.00
0.02
0.02
89.00
0.01
0.01
90.00
0.01
0.01
91.00
0.01
0.01
92.00
0.01
0.01
93.00
0.01
0.01
94.00
0.01
0.01
95.00
0.01
0.01
96.00
0.01
0.01
97.00
0.01
0.01
98.00
0.01
0.01
99.00
0.01
0.01
100.00
0.01
0.01
101.00
0.01
0.01
102.00
0.01
0.01
103.00
0.01
0.01
104.00
0.01
0.01
105.00
0.01
0.01
106.00
0.01
0.01
107.00
0.01
0.01
108.00
0.01
0.01
109.00
0.01
0.01
110.00
0.01
0.01
111.00
0.01
0.01
112.00
0.01
0.01
113.00
0.01
0.01
114.00
0.01
0.01
115.00
0.01
0.01
116.00
0.01
0.01
117.00
0.01
0.01
118.00
0.01
0.01
119.00
0.01
0.01
120.00
0.01
0.01

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 41
Summary for Pond 13P: POND 1
Inflow Area = 31.010 ac, 78.30% Impervious, Inflow Depth = 1.81" for lyr-24hr event
Inflow = 98.57 cfs @ 11.95 hrs, Volume= 4.678 of
Outflow = 4.65 cfs @ 13.09 hrs, Volume= 4.670 af, Atten= 95%, Lag= 68.2 min
Primary = 4.65 cfs @ 13.09 hrs, Volume= 4.670 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 704.55' @ 13.09 hrs Surf.Area= 38,232 sf Storage= 113,981 cf
Plug -Flow detention time= 338.3 min calculated for 4.670 of (100% of inflow)
Center -of -Mass det. time= 337.1 min ( 1,145.1 - 808.0 )
Volume
Invert Avail.Storage Storage Description
#1
701.00'
393,227 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.00
22,606
0
0
702.00
30,532
26,569
26,569
703.00
33,334
31,933
58,502
704.00
36,378
34,856
93,358
705.00
39,732
38,055
131,413
706.00
43,988
41,860
173,273
707.00
49,187
46,588
219,861
708.00
54,818
52,003
271,863
709.00
60,624
57,721
329,584
710.00
66,662
63,643
393,227
Device Routing Invert Outlet Devices
#1 Primary 700.39' 36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 700.39' / 700.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1 701.00' 10.0" Vert. 8" Orifice C= 0.600
#3 Device 1 706.00' 36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=4.65 cfs @ 13.09 hrs HW=704.55' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 4.65 cfs of 50.17 cfs potential flow)
2=8" Orifice (Orifice Controls 4.65 cfs @ 8.53 fps)
3=Orifice/Grate ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=701.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 42
'0=6 1 gM10 141ii
Hydrograph
---r-r--r-
98.57 CfS
r-y--r-
--r-
--r-r--r-1
--r-y--r-y--r-y--�rry-y--r----r-y--r-y-/-�r-y--
7-
I --
r-r--r----r-r--r-r--r-r--
■ Inflow
■Outflow
---
----------
--
------
----�11��-�
I-
V a�u
■Primary
110
-
-
-
- -
-
- -
-
- -
-
- -
- -
-
■Secondary
105
-
-
---
-----
, --
-----__r_
__ ----r-
- --- /� r-
100
-
-
--
-
--
-
--
-
--
-
----
--
-Peals-EJeV=7-04.�--
95
-
-
-,--,
--,--,
-
--,
--,--,
-
----
-,--r
-r ---- r -, - -
85
-
-
--
-
--
-
--r-
--
-
-- -
--
- -- ----r- -- - --r- --
80
-
-
J--r-J--r-
--
-J--r-
----J--r-J--L--'--
-J--r---r-J--
75
-
-
7--Ir-
--Ir-
--r-
--Ir-
--Ir-7--Ir-
--Ir--li--r- --Ir---r-7--
70
---
-----------------------------------------------------
6560
w
--r-y--Ir-y--Ir-y--Ir-y--Ir--li--r-y--Ir-y--r-y--
55
o
-
-
--
-
--
-
--
-
--
-
----
--
- -- ---- - -- - -- - --
_ 50
-
-
---
-
----
--
-
--
-
-------
-------- - -- - -- ----
LL45
-
-
--
-
--
-
--
-
--
-
----
--
- -- ---- - -- - -- - --
35
-
-
--
-
--
-
--
-
--
-
----
--
- -- ---- - -- - -- - --
30
25
-
J--r-J--r-
--
-J--r-
1 ---
----J--r-J--L--'--
--
---------- -r - - -- - --r- --
-J--r---r-J--
15
4.65 cfs OAR
0.00 Cfs
0
0 5 10 15
20 25
30
35
40
45
50
55
60
65
70 75
80
85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 13P: POND 1
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.00
0.00
0.00
0.00
2.50
0.00
0
701.00
0.00
0.00
0.00
5.00
0.00
0
701.00
0.00
0.00
0.00
7.50
0.24
606
701.03
0.00
0.00
0.00
10.00
1.23
5,687
701.24
0.22
0.22
0.00
12.50
7.87
111,452
704.49
4.60
4.60
0.00
15.00
2.38
104,265
704.30
4.46
4.46
0.00
17.50
1.53
82,852
703.71
3.97
3.97
0.00
20.00
1.05
61,245
703.08
3.39
3.39
0.00
22.50
0.94
42,522
702.51
2.75
2.75
0.00
25.00
0.00
26,045
701.98
1.98
1.98
0.00
27.50
0.00
13,093
701.53
0.91
0.91
0.00
30.00
0.00
7,730
701.32
0.38
0.38
0.00
32.50
0.00
5,289
701.23
0.19
0.19
0.00
35.00
0.00
3,964
701.17
0.11
0.11
0.00
37.50
0.00
3,149
701.14
0.07
0.07
0.00
40.00
0.00
2,602
701.11
0.05
0.05
0.00
42.50
0.00
2,212
701.10
0.04
0.04
0.00
45.00
0.00
1,922
701.08
0.03
0.03
0.00
47.50
0.00
1,697
701.07
0.02
0.02
0.00
50.00
0.00
1,518
701.07
0.02
0.02
0.00
52.50
0.00
1,373
701.06
0.01
0.01
0.00
55.00
0.00
1,252
701.05
0.01
0.01
0.00
57.50
0.00
1,151
701.05
0.01
0.01
0.00
60.00
0.00
1,065
701.05
0.01
0.01
0.00
62.50
0.00
990
701.04
0.01
0.01
0.00
65.00
0.00
925
701.04
0.01
0.01
0.00
67.50
0.00
868
701.04
0.01
0.01
0.00
70.00
0.00
818
701.04
0.01
0.01
0.00
72.50
0.00
773
701.03
0.00
0.00
0.00
75.00
0.00
732
701.03
0.00
0.00
0.00
77.50
0.00
696
701.03
0.00
0.00
0.00
80.00
0.00
663
701.03
0.00
0.00
0.00
82.50
0.00
633
701.03
0.00
0.00
0.00
85.00
0.00
606
701.03
0.00
0.00
0.00
87.50
0.00
580
701.03
0.00
0.00
0.00
90.00
0.00
557
701.02
0.00
0.00
0.00
92.50
0.00
536
701.02
0.00
0.00
0.00
95.00
0.00
516
701.02
0.00
0.00
0.00
97.50
0.00
498
701.02
0.00
0.00
0.00
100.00
0.00
480
701.02
0.00
0.00
0.00
102.50
0.00
464
701.02
0.00
0.00
0.00
105.00
0.00
449
701.02
0.00
0.00
0.00
107.50
0.00
435
701.02
0.00
0.00
0.00
110.00
0.00
422
701.02
0.00
0.00
0.00
112.50
0.00
410
701.02
0.00
0.00
0.00
115.00
0.00
398
701.02
0.00
0.00
0.00
117.50
0.00
387
701.02
0.00
0.00
0.00
120.00
0.00
376
701.02
0.00
0.00
0.00
Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 44
Stage -Discharge for Pond 13P: POND 1
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.00
0.00
0.00
0.00
701.10
0.04
0.04
0.00
701.20
0.15
0.15
0.00
701.30
0.33
0.33
0.00
701.40
0.56
0.56
0.00
701.50
0.82
0.82
0.00
701.60
1.11
1.11
0.00
701.70
1.39
1.39
0.00
701.80
1.64
1.64
0.00
701.90
1.83
1.83
0.00
702.00
2.01
2.01
0.00
702.10
2.17
2.17
0.00
702.20
2.32
2.32
0.00
702.30
2.47
2.47
0.00
702.40
2.60
2.60
0.00
702.50
2.73
2.73
0.00
702.60
2.86
2.86
0.00
702.70
2.98
2.98
0.00
702.80
3.09
3.09
0.00
702.90
3.20
3.20
0.00
703.00
3.30
3.30
0.00
703.10
3.41
3.41
0.00
703.20
3.51
3.51
0.00
703.30
3.60
3.60
0.00
703.40
3.70
3.70
0.00
703.50
3.79
3.79
0.00
703.60
3.88
3.88
0.00
703.70
3.97
3.97
0.00
703.80
4.05
4.05
0.00
703.90
4.14
4.14
0.00
704.00
4.22
4.22
0.00
704.10
4.30
4.30
0.00
704.20
4.38
4.38
0.00
704.30
4.46
4.46
0.00
704.40
4.54
4.54
0.00
704.50
4.61
4.61
0.00
704.60
4.69
4.69
0.00
704.70
4.76
4.76
0.00
704.80
4.83
4.83
0.00
704.90
4.90
4.90
0.00
705.00
4.97
4.97
0.00
705.10
5.04
5.04
0.00
705.20
5.11
5.11
0.00
705.30
5.18
5.18
0.00
705.40
5.24
5.24
0.00
705.50
5.31
5.31
0.00
705.60
5.37
5.37
0.00
705.70
5.44
5.44
0.00
705.80
5.50
5.50
0.00
705.90
5.56
5.56
0.00
706.00
5.62
5.62
0.00
706.10
6.60
6.60
0.00
706.20
8.33
8.33
0.00
706.30
10.55
10.55
0.00
706.40
13.17
13.17
0.00
706.50
16.14
16.14
0.00
706.60
19.41
19.41
0.00
706.70
22.78
22.78
0.00
706.80
25.36
25.36
0.00
706.90
27.56
27.56
0.00
707.00
29.54
29.54
0.00
707.10
31.35
31.35
0.00
707.20
33.04
33.04
0.00
707.30
34.63
34.63
0.00
707.40
36.14
36.14
0.00
707.50
37.57
37.57
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
707.60
38.95
38.95
0.00
707.70
40.27
40.27
0.00
707.80
41.55
41.55
0.00
707.90
42.78
42.78
0.00
708.00
43.97
43.97
0.00
708.10
46.79
46.79
0.00
708.20
50.94
50.94
0.00
708.30
55.95
55.95
0.00
708.40
61.66
61.66
0.00
708.50
67.97
67.97
0.00
708.60
75.60
74.81
0.79
708.70
84.36
82.14
2.23
708.80
93.62
89.47
4.15
708.90
96.59
90.11
6.48
709.00
100.05
90.75
9.30
709.10
103.94
91.39
12.55
709.20
107.80
92.02
15.78
709.30
111.90
92.65
19.25
709.40
116.20
93.27
22.92
709.50
120.69
93.89
26.80
709.60
125.48
94.50
30.98
709.70
130.48
95.12
35.36
709.80
135.45
95.72
39.72
709.90
140.55
96.33
44.23
710.00
145.70
96.93
48.78

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 45
Stage -Area -Storage for Pond 13P: POND 1
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.00
22,606
0
701.10
23,399
2,300
701.20
24,191
4,680
701.30
24,984
7,138
701.40
25,776
9,676
701.50
26,569
12,294
701.60
27,362
14,990
701.70
28,154
17,766
701.80
28,947
20,621
701.90
29,739
23,555
702.00
30,532
26,569
702.10
30,812
29,636
702.20
31,092
32,731
702.30
31,373
35,855
702.40
31,653
39,006
702.50
31,933
42,185
702.60
32,213
45,393
702.70
32,493
48,628
702.80
32,774
51,891
702.90
33,054
55,183
703.00
33,334
58,502
703.10
33,638
61,851
703.20
33,943
65,230
703.30
34,247
68,639
703.40
34,552
72,079
703.50
34,856
75,550
703.60
35,160
79,050
703.70
35,465
82,582
703.80
35,769
86,143
703.90
36,074
89,735
704.00
36,378
93,358
704.10
36,713
97,013
704.20
37,049
100,701
704.30
37,384
104,422
704.40
37,720
108,178
704.50
38,055
111,966
704.60
38,390
115,789
704.70
38,726
119,644
704.80
39,061
123,534
704.90
39,397
127,457
705.00
39,732
131,413
705.10
40,158
135,407
705.20
40,583
139,445
705.30
41,009
143,524
705.40
41,434
147,646
705.50
41,860
151,811
705.60
42,286
156,018
705.70
42,711
160,268
705.80
43,137
164,561
705.90
43,562
168,895
706.00
43,988
173,273
706.10
44,508
177,698
706.20
45,028
182,175
706.30
45,548
186,703
706.40
46,068
191,284
706.50
46,588
195,917
706.60
47,107
200,602
706.70
47,627
205,338
706.80
48,147
210,127
706.90
48,667
214,968
707.00
49,187
219,861
707.10
49,750
224,807
707.20
50,313
229,811
707.30
50,876
234,870
707.40
51,439
239,986
707.50
52.003
245.158
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
707.60
52,566
250,386
707.70
53,129
255,671
707.80
53,692
261,012
707.90
54,255
266,409
708.00
54,818
271,863
708.10
55,399
277,374
708.20
55,979
282,943
708.30
56,560
288,570
708.40
57,140
294,255
708.50
57,721
299,998
708.60
58,302
305,799
708.70
58,882
311,658
708.80
59,463
317,575
708.90
60,043
323,551
709.00
60,624
329,584
709.10
61,228
335,677
709.20
61,832
341,830
709.30
62,435
348,043
709.40
63,039
354,317
709.50
63,643
360,651
709.60
64,247
367,045
709.70
64,851
373,500
709.80
65,454
380,015
709.90
66,058
386,591
710.00
66,662
393,227

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 46
Summary for Pond 15P: POND 6
Inflow Area = 13.860 ac, 74.39% Impervious, Inflow Depth = 1.73" for lyr-24hr event
Inflow = 42.36 cfs @ 11.96 hrs, Volume= 1.997 of
Outflow = 2.81 cfs @ 12.62 hrs, Volume= 1.985 af, Atten= 93%, Lag= 40.2 min
Primary = 2.81 cfs @ 12.62 hrs, Volume= 1.985 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 678.56' @ 12.62 hrs Surf.Area= 32,264 sf Storage= 46,575 cf
Plug -Flow detention time= 311.4 min calculated for 1.984 of (99% of inflow)
Center -of -Mass det. time= 309.8 min ( 1,122.2 - 812.4 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
270,951 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
27,493
0 0
678.00
30,495
28,994 28,994
679.00
33,652
32,074 61,068
680.00
36,914
35,283 96,351
681.00
40,232
38,573 134,924
682.00
43,608
41,920 176,844
683.00
47,039
45,324 222,167
684.00
50,528
48,784 270,951
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1
677.00'
10.0" Vert. 8" Orifice C= 0.600
#3 Device 1
680.00'
36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1
682.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
682.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=2.81 cfs @ 12.62 hrs HW=678.56' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 2.81 cfs of 21.72 cfs potential flow)
2=8" Orifice (Orifice Controls 2.81 cfs @ 5.15 fps)
3=Orifice/Grate ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD® 10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 47
'0=6 1 gMMR09]kiI1
.....
IN Inflow
•
•
IN Outflow
• '
• • •
IN Primary
N Secondary
•1
• C I _
1
1
1
FTM
////00 .12 /////////
/� ��/////////////////////////////////////////////////////////////////////////////////�
15 10 15 20 25 30 �1 1 .1 1 : •1 11 105 110 115 120

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 15P: POND 6
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.00
0
677.00
0.00
0.00
0.00
7.50
0.07
119
677.00
0.00
0.00
0.00
10.00
0.47
2,112
677.08
0.02
0.02
0.00
12.50
3.43
46,461
678.56
2.80
2.80
0.00
15.00
1.04
37,366
678.27
2.43
2.43
0.00
17.50
0.67
25,566
677.89
1.80
1.80
0.00
20.00
0.46
17,374
677.61
1.14
1.14
0.00
22.50
0.41
13,120
677.47
0.73
0.73
0.00
25.00
0.00
9,946
677.35
0.45
0.45
0.00
27.50
0.00
7,002
677.25
0.24
0.24
0.00
30.00
0.00
5,348
677.19
0.14
0.14
0.00
32.50
0.00
4,305
677.16
0.09
0.09
0.00
35.00
0.00
3,593
677.13
0.07
0.07
0.00
37.50
0.00
3,078
677.11
0.05
0.05
0.00
40.00
0.00
2,690
677.10
0.04
0.04
0.00
42.50
0.00
2,387
677.09
0.03
0.03
0.00
45.00
0.00
2,144
677.08
0.02
0.02
0.00
47.50
0.00
1,945
677.07
0.02
0.02
0.00
50.00
0.00
1,780
677.06
0.02
0.02
0.00
52.50
0.00
1,640
677.06
0.01
0.01
0.00
55.00
0.00
1,520
677.06
0.01
0.01
0.00
57.50
0.00
1,417
677.05
0.01
0.01
0.00
60.00
0.00
1,326
677.05
0.01
0.01
0.00
62.50
0.00
1,246
677.05
0.01
0.01
0.00
65.00
0.00
1,176
677.04
0.01
0.01
0.00
67.50
0.00
1,112
677.04
0.01
0.01
0.00
70.00
0.00
1,055
677.04
0.01
0.01
0.00
72.50
0.00
1,004
677.04
0.01
0.01
0.00
75.00
0.00
957
677.03
0.00
0.00
0.00
77.50
0.00
915
677.03
0.00
0.00
0.00
80.00
0.00
876
677.03
0.00
0.00
0.00
82.50
0.00
840
677.03
0.00
0.00
0.00
85.00
0.00
807
677.03
0.00
0.00
0.00
87.50
0.00
777
677.03
0.00
0.00
0.00
90.00
0.00
748
677.03
0.00
0.00
0.00
92.50
0.00
722
677.03
0.00
0.00
0.00
95.00
0.00
698
677.03
0.00
0.00
0.00
97.50
0.00
675
677.02
0.00
0.00
0.00
100.00
0.00
653
677.02
0.00
0.00
0.00
102.50
0.00
633
677.02
0.00
0.00
0.00
105.00
0.00
614
677.02
0.00
0.00
0.00
107.50
0.00
596
677.02
0.00
0.00
0.00
110.00
0.00
579
677.02
0.00
0.00
0.00
112.50
0.00
563
677.02
0.00
0.00
0.00
115.00
0.00
548
677.02
0.00
0.00
0.00
117.50
0.00
534
677.02
0.00
0.00
0.00
120.00
0.00
520
677.02
0.00
0.00
0.00
Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 49
Stage -Discharge for Pond 15P: POND 6
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.15
0.15
0.00
677.30
0.33
0.33
0.00
677.40
0.56
0.56
0.00
677.50
0.82
0.82
0.00
677.60
1.11
1.11
0.00
677.70
1.39
1.39
0.00
677.80
1.64
1.64
0.00
677.90
1.83
1.83
0.00
678.00
2.01
2.01
0.00
678.10
2.17
2.17
0.00
678.20
2.32
2.32
0.00
678.30
2.47
2.47
0.00
678.40
2.60
2.60
0.00
678.50
2.73
2.73
0.00
678.60
2.86
2.86
0.00
678.70
2.98
2.98
0.00
678.80
3.09
3.09
0.00
678.90
3.20
3.20
0.00
679.00
3.30
3.30
0.00
679.10
3.41
3.41
0.00
679.20
3.51
3.51
0.00
679.30
3.60
3.60
0.00
679.40
3.70
3.70
0.00
679.50
3.79
3.79
0.00
679.60
3.88
3.88
0.00
679.70
3.97
3.97
0.00
679.80
4.05
4.05
0.00
679.90
4.14
4.14
0.00
680.00
4.22
4.22
0.00
680.10
5.22
5.22
0.00
680.20
6.97
6.97
0.00
680.30
9.21
9.21
0.00
680.40
11.84
11.84
0.00
680.50
14.83
14.83
0.00
680.60
18.11
18.11
0.00
680.70
21.50
21.50
0.00
680.80
24.10
24.10
0.00
680.90
26.31
26.31
0.00
681.00
28.30
28.30
0.00
681.10
30.13
30.13
0.00
681.20
31.83
31.83
0.00
681.30
33.44
33.44
0.00
681.40
34.95
34.95
0.00
681.50
36.40
36.40
0.00
681.60
37.79
37.79
0.00
681.70
39.12
39.12
0.00
681.80
40.41
40.41
0.00
681.90
41.65
41.65
0.00
682.00
42.86
42.86
0.00
682.10
45.68
45.68
0.00
682.20
49.84
49.84
0.00
682.30
54.87
54.87
0.00
682.40
60.59
60.59
0.00
682.50
66.90
66.90
0.00
682.60
74.54
73.75
0.79
682.70
76.87
74.64
2.23
682.80
79.57
75.42
4.15
682.90
82.66
76.18
6.48
683.00
86.24
76.94
9.30
683.10
90.23
77.69
12.55
683.20
94.21
78.43
15.78
683.30
98.41
79.16
19.25
683.40
102.82
79.89
22.92
683.50
107.41
80.61
26.80
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
112.31
81.33
30.98
683.70
117.40
82.04
35.36
683.80
122.46
82.74
39.72
683.90
127.67
83.44
44.23
684.00
132.90
84.13
48.78

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 50
Stage -Area -Storage for Pond 15P: POND 6
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
27,493
0
677.10
27,793
2,764
677.20
28,093
5,559
677.30
28,394
8,383
677.40
28,694
11,237
677.50
28,994
14,122
677.60
29,294
17,036
677.70
29,594
19,981
677.80
29,895
22,955
677.90
30,195
25,960
678.00
30,495
28,994
678.10
30,811
32,059
678.20
31,126
35,156
678.30
31,442
38,285
678.40
31,758
41,445
678.50
32,074
44,636
678.60
32,389
47,859
678.70
32,705
51,114
678.80
33,021
54,400
678.90
33,336
57,718
679.00
33,652
61,068
679.10
33,978
64,449
679.20
34,304
67,863
679.30
34,631
71,310
679.40
34,957
74,789
679.50
35,283
78,301
679.60
35,609
81,846
679.70
35,935
85,423
679.80
36,262
89,033
679.90
36,588
92,675
680.00
36,914
96,351
680.10
37,246
100,058
680.20
37,578
103,800
680.30
37,909
107,574
680.40
38,241
111,382
680.50
38,573
115,222
680.60
38,905
119,096
680.70
39,237
123,003
680.80
39,568
126,943
680.90
39,900
130,917
681.00
40,232
134,924
681.10
40,570
138,964
681.20
40,907
143,037
681.30
41,245
147,145
681.40
41,582
151,286
681.50
41,920
155,462
681.60
42,258
159,670
681.70
42,595
163,913
681.80
42,933
168,189
681.90
43,270
172,500
682.00
43,608
176,844
682.10
43,951
181,221
682.20
44,294
185,634
682.30
44,637
190,080
682.40
44,980
194,561
682.50
45,324
199,076
682.60
45,667
203,626
682.70
46,010
208,210
682.80
46,353
212,828
682.90
46,696
217,480
683.00
47,039
222,167
683.10
47,388
226,888
683.20
47,737
231,645
683.30
48,086
236,436
683.40
48,435
241,262
683.50
48.784
246.123
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
49,132
251,018
683.70
49,481
255,949
683.80
49,830
260,915
683.90
50,179
265,915
684.00
50,528
270,951

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 51
Summary for Pond 18P: POST - OUTFALL #1
Inflow Area = 43.400 ac, 64.70% Impervious, Inflow Depth = 1.49" for 1yr-24hr event
Inflow = 18.62 cfs @ 11.97 hrs, Volume= 5.390 of
Primary = 18.62 cfs @ 11.97 hrs, Volume= 5.390 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 18P: POST - OUTFALL #1
Hydrograph
❑ Inflow
-+--+-+--+--+--+-+--+--+--+--+-+--+--+--�--+--+--+--+-+--
Primary
zo
19
18.62
cfs
-- - ;
--r---------r-------�--fi
----------
-------------
+
r -�- r--I- rt r--I--
-[ f�oW re47 ap -
18
-
- -
- -
- - - - - -
17
-'-1--L--1---'--
--+--'---'--J--+--L----J--1--L--1-----1--L--L--'--
16
---+--r--+--i--
--+--+--i--
--+--+--+-
--+--r-----i----r--+--i--
15
-- -
--r-------
--r-------1--r--Ir----I--7--r-------I--r--Ir----
14
13
H 12
--' -
-------'--
--+-----'--
--+--
--'-- --+-------'-- -- -- --'--
3 10
p
+
-- -
LL 9
�'
--� -
-------�--
--
-----�----
--------�-- -------�-- -------�--
8
-- ---
7
-----'--
--+-----'--
--+--
--'-- --+-------'-- -- -- --'--
6
--
r--li---li--
--r--Ir--li--
--r--Ir--li--7--7--r--Ir--li--
--r--Ir--li--
5
__
--------+--i
-------i--i
-------+--i---------i --i --i--
4
3
--' -1
-1--1--L--1---1--J--1--L--1--J--1--L--1-----1--L--
--'--
2
1
0
0 5
10 15 20
25 30
35 40
45
50 55 60 65
70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 52
Hydrograph for Pond 18P: POST - OUTFALL #1
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.00
0.00
7.00
0.00
0.00
8.00
0.01
0.01
9.00
0.06
0.06
10.00
0.22
0.22
11.00
0.70
0.70
12.00
17.88
17.88
13.00
5.69
5.69
14.00
5.25
5.25
15.00
4.99
4.99
16.00
4.71
4.71
17.00
4.46
4.46
18.00
4.21
4.21
19.00
3.93
3.93
20.00
3.64
3.64
21.00
3.38
3.38
22.00
3.11
3.11
23.00
2.85
2.85
24.00
2.59
2.59
25.00
1.98
1.98
26.00
1.57
1.57
27.00
1.10
1.10
28.00
0.75
0.75
29.00
0.52
0.52
30.00
0.38
0.38
31.00
0.28
0.28
32.00
0.22
0.22
33.00
0.17
0.17
34.00
0.14
0.14
35.00
0.11
0.11
36.00
0.09
0.09
37.00
0.08
0.08
38.00
0.07
0.07
39.00
0.06
0.06
40.00
0.05
0.05
41.00
0.04
0.04
42.00
0.04
0.04
43.00
0.03
0.03
44.00
0.03
0.03
45.00
0.03
0.03
46.00
0.03
0.03
47.00
0.02
0.02
48.00
0.02
0.02
49.00
0.02
0.02
50.00
0.02
0.02
51.00
0.02
0.02
52.00
0.02
0.02
53.00
0.01
0.01
54.00
0.01
0.01
55.00
0.01
0.01
56.00
0.01
0.01
57.00
0.01
0.01
58.00
0.01
0.01
59.00
0.01
0.01
60.00
0.01
0.01
61.00
0.01
0.01
62.00
0.01
0.01
63.00
0.01
0.01
64.00
0.01
0.01
65.00
0.01
0.01
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.01
0.01
67.00
0.01
0.01
68.00
0.01
0.01
69.00
0.01
0.01
70.00
0.01
0.01
71.00
0.01
0.01
72.00
0.00
0.00
73.00
0.00
0.00
74.00
0.00
0.00
75.00
0.00
0.00
76.00
0.00
0.00
77.00
0.00
0.00
78.00
0.00
0.00
79.00
0.00
0.00
80.00
0.00
0.00
81.00
0.00
0.00
82.00
0.00
0.00
83.00
0.00
0.00
84.00
0.00
0.00
85.00
0.00
0.00
86.00
0.00
0.00
87.00
0.00
0.00
88.00
0.00
0.00
89.00
0.00
0.00
90.00
0.00
0.00
91.00
0.00
0.00
92.00
0.00
0.00
93.00
0.00
0.00
94.00
0.00
0.00
95.00
0.00
0.00
96.00
0.00
0.00
97.00
0.00
0.00
98.00
0.00
0.00
99.00
0.00
0.00
100.00
0.00
0.00
101.00
0.00
0.00
102.00
0.00
0.00
103.00
0.00
0.00
104.00
0.00
0.00
105.00
0.00
0.00
106.00
0.00
0.00
107.00
0.00
0.00
108.00
0.00
0.00
109.00
0.00
0.00
110.00
0.00
0.00
111.00
0.00
0.00
112.00
0.00
0.00
113.00
0.00
0.00
114.00
0.00
0.00
115.00
0.00
0.00
116.00
0.00
0.00
117.00
0.00
0.00
118.00
0.00
0.00
119.00
0.00
0.00
120.00
0.00
0.00

TriWest Building 2 SWM Type 1124-hr 1 yr-24hr Rainfall=2.81 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 53
Summary for Pond 21 P: POST - OUTFALL #3
Inflow Area = 17.630 ac, 58.48% Impervious, Inflow Depth > 1.40" for 1yr-24hr event
Inflow = 3.15 cfs @ 12.28 hrs, Volume= 2.061 of
Primary = 3.15 cfs @ 12.28 hrs, Volume= 2.061 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 21 P: POST - OUTFALL #3
Hydrograph
❑ Inflow
❑ Primary
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 1yr-24hrRainfall=2.81"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 54
Hydrograph for Pond 21 P: POST - OUTFALL #3
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.00
0.00
7.00
0.00
0.00
8.00
0.00
0.00
9.00
0.00
0.00
10.00
0.02
0.02
11.00
0.11
0.11
12.00
2.42
2.42
13.00
2.95
2.95
14.00
2.74
2.74
15.00
2.51
2.51
16.00
2.25
2.25
17.00
1.99
1.99
18.00
1.73
1.73
19.00
1.46
1.46
20.00
1.18
1.18
21.00
0.97
0.97
22.00
0.82
0.82
23.00
0.72
0.72
24.00
0.64
0.64
25.00
0.45
0.45
26.00
0.34
0.34
27.00
0.27
0.27
28.00
0.21
0.21
29.00
0.17
0.17
30.00
0.14
0.14
31.00
0.12
0.12
32.00
0.10
0.10
33.00
0.09
0.09
34.00
0.08
0.08
35.00
0.07
0.07
36.00
0.06
0.06
37.00
0.05
0.05
38.00
0.05
0.05
39.00
0.04
0.04
40.00
0.04
0.04
41.00
0.03
0.03
42.00
0.03
0.03
43.00
0.03
0.03
44.00
0.03
0.03
45.00
0.02
0.02
46.00
0.02
0.02
47.00
0.02
0.02
48.00
0.02
0.02
49.00
0.02
0.02
50.00
0.02
0.02
51.00
0.02
0.02
52.00
0.01
0.01
53.00
0.01
0.01
54.00
0.01
0.01
55.00
0.01
0.01
56.00
0.01
0.01
57.00
0.01
0.01
58.00
0.01
0.01
59.00
0.01
0.01
60.00
0.01
0.01
61.00
0.01
0.01
62.00
0.01
0.01
63.00
0.01
0.01
64.00
0.01
0.01
65.00
0.01
0.01
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.01
0.01
67.00
0.01
0.01
68.00
0.01
0.01
69.00
0.01
0.01
70.00
0.01
0.01
71.00
0.01
0.01
72.00
0.01
0.01
73.00
0.01
0.01
74.00
0.01
0.01
75.00
0.00
0.00
76.00
0.00
0.00
77.00
0.00
0.00
78.00
0.00
0.00
79.00
0.00
0.00
80.00
0.00
0.00
81.00
0.00
0.00
82.00
0.00
0.00
83.00
0.00
0.00
84.00
0.00
0.00
85.00
0.00
0.00
86.00
0.00
0.00
87.00
0.00
0.00
88.00
0.00
0.00
89.00
0.00
0.00
90.00
0.00
0.00
91.00
0.00
0.00
92.00
0.00
0.00
93.00
0.00
0.00
94.00
0.00
0.00
95.00
0.00
0.00
96.00
0.00
0.00
97.00
0.00
0.00
98.00
0.00
0.00
99.00
0.00
0.00
100.00
0.00
0.00
101.00
0.00
0.00
102.00
0.00
0.00
103.00
0.00
0.00
104.00
0.00
0.00
105.00
0.00
0.00
106.00
0.00
0.00
107.00
0.00
0.00
108.00
0.00
0.00
109.00
0.00
0.00
110.00
0.00
0.00
111.00
0.00
0.00
112.00
0.00
0.00
113.00
0.00
0.00
114.00
0.00
0.00
115.00
0.00
0.00
116.00
0.00
0.00
117.00
0.00
0.00
118.00
0.00
0.00
119.00
0.00
0.00
120.00
0.00
0.00

OAK
E N G I N E E R I N G
HYDROCAD OUTPUT
2-YEAR, 24-HOUR STORM EVENT

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 1
Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method
Subcatchment3S: POST TO POND
Subcatchment4S: PRE (OUTFALL#1)
Subcatchment5S: PRE (OUTFALL#2)
Subcatchment6S: PRE (OUTFALL#3)
Subcatchment7S: POST TO POND
Subcatchment9S: POST TO POND
Subcatchment12S: POST TO POND 1
Subcatchment14S: POST TO POND
Subcatchment17S: UNDETAINEDPOST TO OUTFALL1
Runoff Area=27.080 ac 79.03% Impervious Runoff Depth=2.35"
Tc=5.0 min CN=90 Runoff=110.05 cfs 5.292 of
Runoff Area=43.130 ac 0.00% Impervious Runoff Depth=1.11"
Flow Length=1,162' Tc=21.9 min CN=73 Runoff=47.44 cfs 3.976 of
Runoff Area=57.860 ac 0.00% Impervious Runoff Depth=1.16"
Flow Length=1,162' Tc=21.9 min CN=74 Runoff=67.67 cfs 5.615 of
Runoff Area=14.930 ac 0.00% Impervious Runoff Depth=1.11"
Flow Length=1,162' Tc=21.9 min CN=73 Runoff=16.42 cfs 1.376 of
Runoff Area=15.260
ac 72.15% Impervious Runoff Depth=2.17"
Tc=5.0 min CN=88 Runoff=58.17 cfs 2.758 of
Runoff Area=10.550
ac 69.48% Impervious Runoff Depth=2.08"
Tc=5.0 min CN=87 Runoff=38.86 cfs 1.832 of
Runoff Area=31.010 ac 78.30% Impervious Runoff Depth=2.35"
Tc=5.0 min CN=90 Runoff=126.02 cfs 6.060 of
Runoff Area=13.860
ac 74.39% Impervious Runoff Depth=2.26"
Tc=5.0 min CN=89 Runoff=54.59 cfs 2.605 of
Runoff Area=12.390
ac 30.67% Impervious Runoff Depth=1.05"
Tc=5.0 min CN=72 Runoff=23.02 cfs 1.084 of
Subcatchment19S: UNDETAINEDPOST TO OUTFALL2 Runoff Area=14.730 ac 0.00% Impervious Runoff Depth=0.41"
Flow Length=1,162' Tc=21.9 min CN=58 Runoff=3.74 cfs 0.504 of
Subcatchment20S: UNDETAINEDPOST TO OUTFALL3 Runoff Area=3.770 ac 0.00% Impervious Runoff Depth=0.45"
Flow Length=1,162' Tc=21.9 min CN=59 Runoff=1.11 cfs 0.140 of
Pond 2P: POND 2
Peak EIev=715.30' Storage=134,642 cf Inflow=110.05 cfs 5.292 of
Primary=6.93 cfs 5.281 of Secondary=0.00 cfs 0.000 of Outflow=6.93 cfs 5.281 of
Pond 8P: POND 3
Peak EIev=703.58' Storage=74,706 cf Inflow=58.17 cfs 2.758 of
Primary=1.87 cfs 2.721 of Secondary=0.00 cfs 0.000 of Outflow=1.87 cfs 2.721 of
Pond 10P: POND 4
Peak EIev=681.19' Storage=36,402 cf Inflow=38.86 cfs 1.832 of
Primary=3.30 cfs 1.832 of Secondary=0.00 cfs 0.000 of Outflow=3.30 cfs 1.832 of
Pond 11 P: POST - OUTFALL#2
Inflow=13.80 cfs 10.338 of
Primary=13.80 cfs 10.338 of
Pond 13P: POND 1
Peak EIev=705.50' Storage=151,682 cf Inflow=126.02 cfs 6.060 of
Primary=5.30 cfs 6.052 of Secondary=0.00 cfs 0.000 of Outflow=5.30 cfs 6.052 of
Pond 15P: POND 6
Peak EIev=679.04' Storage=62,282 cf Inflow=54.59 cfs 2.605 of
Primary=3.34 cfs 2.593 of Secondary=0.00 cfs 0.000 of Outflow=3.34 cfs 2.593 of
Pond 18P: POST- OUTFALL#1
Inflow=27.36 cfs 7.135 of
Primary=27.36 cfs 7.135 of
Pond 21 P: POST - OUTFALL#3
Inflow=4.37 cfs 2.734 of
Primary=4.37 cfs 2.734 of
Total Runoff Area = 244.570 ac Runoff Volume = 31.244 of Average Runoff Depth = 1.53"
68.05% Pervious = 166.440 ac 31.95% Impervious = 78.130 ac

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 2
Summary for Subcatchment 3S: POST TO POND 2
Runoff = 110.05 cfs @ 11.95 hrs, Volume= 5.292 af, Depth= 2.35"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN
Description
21.400 98
Impervious
5.680 61
>75% Grass cover, Good, HSG B
27.080 90
Weighted Average
5.680
20.97% Pervious Area
21.400
79.03% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 3S: POST TO POND 2
Hydrograph
- 1 -- 1 -- T -- r --r----,-- -- T -- r-
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 3
Hydrograph for Subcatchment 3S: POST TO POND 2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.12
7.00
0.34
0.01
0.31
8.00
0.41
0.03
0.52
9.00
0.50
0.05
1.01
10.00
0.61
0.10
1.60
11.00
0.80
0.20
3.55
12.00
2.25
1.31
93.86
13.00
2.62
1.64
5.41
14.00
2.78
1.78
3.24
15.00
2.89
1.89
2.58
16.00
2.98
1.97
2.00
17.00
3.06
2.04
1.76
18.00
3.12
2.10
1.55
19.00
3.18
2.15
1.34
20.00
3.23
2.19
1.13
21.00
3.27
2.23
1.08
22.00
3.31
2.27
1.04
23.00
3.35
2.31
0.99
24.00
3.39
2.35
0.95
25.00
3.39
2.35
0.00
26.00
3.39
2.35
0.00
27.00
3.39
2.35
0.00
28.00
3.39
2.35
0.00
29.00
3.39
2.35
0.00
30.00
3.39
2.35
0.00
31.00
3.39
2.35
0.00
32.00
3.39
2.35
0.00
33.00
3.39
2.35
0.00
34.00
3.39
2.35
0.00
35.00
3.39
2.35
0.00
36.00
3.39
2.35
0.00
37.00
3.39
2.35
0.00
38.00
3.39
2.35
0.00
39.00
3.39
2.35
0.00
40.00
3.39
2.35
0.00
41.00
3.39
2.35
0.00
42.00
3.39
2.35
0.00
43.00
3.39
2.35
0.00
44.00
3.39
2.35
0.00
45.00
3.39
2.35
0.00
46.00
3.39
2.35
0.00
47.00
3.39
2.35
0.00
48.00
3.39
2.35
0.00
49.00
3.39
2.35
0.00
50.00
3.39
2.35
0.00
51.00
3.39
2.35
0.00
52.00
3.39
2.35
0.00
53.00
3.39
2.35
0.00
54.00
3.39
2.35
0.00
55.00
3.39
2.35
0.00
56.00
3.39
2.35
0.00
57.00
3.39
2.35
0.00
58.00
3.39
2.35
0.00
59.00
3.39
2.35
0.00
60.00
3.39
2.35
0.00
61.00
3.39
2.35
0.00
62.00
3.39
2.35
0.00
63.00
3.39
2.35
0.00
64.00
3.39
2.35
0.00
65.00
3.39
2.35
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
2.35
0.00
67.00
3.39
2.35
0.00
68.00
3.39
2.35
0.00
69.00
3.39
2.35
0.00
70.00
3.39
2.35
0.00
71.00
3.39
2.35
0.00
72.00
3.39
2.35
0.00
73.00
3.39
2.35
0.00
74.00
3.39
2.35
0.00
75.00
3.39
2.35
0.00
76.00
3.39
2.35
0.00
77.00
3.39
2.35
0.00
78.00
3.39
2.35
0.00
79.00
3.39
2.35
0.00
80.00
3.39
2.35
0.00
81.00
3.39
2.35
0.00
82.00
3.39
2.35
0.00
83.00
3.39
2.35
0.00
84.00
3.39
2.35
0.00
85.00
3.39
2.35
0.00
86.00
3.39
2.35
0.00
87.00
3.39
2.35
0.00
88.00
3.39
2.35
0.00
89.00
3.39
2.35
0.00
90.00
3.39
2.35
0.00
91.00
3.39
2.35
0.00
92.00
3.39
2.35
0.00
93.00
3.39
2.35
0.00
94.00
3.39
2.35
0.00
95.00
3.39
2.35
0.00
96.00
3.39
2.35
0.00
97.00
3.39
2.35
0.00
98.00
3.39
2.35
0.00
99.00
3.39
2.35
0.00
100.00
3.39
2.35
0.00
101.00
3.39
2.35
0.00
102.00
3.39
2.35
0.00
103.00
3.39
2.35
0.00
104.00
3.39
2.35
0.00
105.00
3.39
2.35
0.00
106.00
3.39
2.35
0.00
107.00
3.39
2.35
0.00
108.00
3.39
2.35
0.00
109.00
3.39
2.35
0.00
110.00
3.39
2.35
0.00
111.00
3.39
2.35
0.00
112.00
3.39
2.35
0.00
113.00
3.39
2.35
0.00
114.00
3.39
2.35
0.00
115.00
3.39
2.35
0.00
116.00
3.39
2.35
0.00
117.00
3.39
2.35
0.00
118.00
3.39
2.35
0.00
119.00
3.39
2.35
0.00
120.00
3.39
2.35
0.00

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 4
Summary for Subcatchment 4S: PRE (OUTFALL #1)
Runoff = 47.44 cfs @ 12.16 hrs, Volume= 3.976 af, Depth= 1.11"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN Description
9.130 55 Woods, Good, HSG B
34.000 78 Row crops, straight row, Good, HSG B
43.130 73 Weighted Average
43.130 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 4S: PRE (OUTFALL #1)
Hydrograph
----------+--+--+--+--+----+--+--+--+--+--+--+--+-+--+--+--+--+--+-- ■Runoff
50 47.44 Cfs
45-,--,--+--------,---,---,----- ----------------T-YIYQ-HTZ -h1r-
40
-- -- ----'+--' -- -- -RuhoffAr6a=4a.-0I-at-
35 -- -- --+-- -- - - -- -- -- nQ##I-V�I me-=1$7$ T Of -
w 30
-- -- - - - -- -- --'+--Runoff'DupthT1.'+1-1"_
° 25 FlOW Ldn-0th=1062'--
-------+--+- ------,--+- -----------+-----
15 OW-7 3
10
5
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 k 95 160 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 5
Hydrograph for Subcatchment 4S: PRE (OUTFALL #1)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.00
8.00
0.41
0.00
0.00
9.00
0.50
0.00
0.00
10.00
0.61
0.00
0.00
11.00
0.80
0.00
0.02
12.00
2.25
0.44
24.97
13.00
2.62
0.63
6.78
14.00
2.78
0.73
3.74
15.00
2.89
0.79
2.84
16.00
2.98
0.85
2.28
17.00
3.06
0.89
1.95
18.00
3.12
0.93
1.74
19.00
3.18
0.97
1.53
20.00
3.23
1.00
1.31
21.00
3.27
1.03
1.21
22.00
3.31
1.06
1.17
23.00
3.35
1.08
1.13
24.00
3.39
1.11
1.09
25.00
3.39
1.11
0.00
26.00
3.39
1.11
0.00
27.00
3.39
1.11
0.00
28.00
3.39
1.11
0.00
29.00
3.39
1.11
0.00
30.00
3.39
1.11
0.00
31.00
3.39
1.11
0.00
32.00
3.39
1.11
0.00
33.00
3.39
1.11
0.00
34.00
3.39
1.11
0.00
35.00
3.39
1.11
0.00
36.00
3.39
1.11
0.00
37.00
3.39
1.11
0.00
38.00
3.39
1.11
0.00
39.00
3.39
1.11
0.00
40.00
3.39
1.11
0.00
41.00
3.39
1.11
0.00
42.00
3.39
1.11
0.00
43.00
3.39
1.11
0.00
44.00
3.39
1.11
0.00
45.00
3.39
1.11
0.00
46.00
3.39
1.11
0.00
47.00
3.39
1.11
0.00
48.00
3.39
1.11
0.00
49.00
3.39
1.11
0.00
50.00
3.39
1.11
0.00
51.00
3.39
1.11
0.00
52.00
3.39
1.11
0.00
53.00
3.39
1.11
0.00
54.00
3.39
1.11
0.00
55.00
3.39
1.11
0.00
56.00
3.39
1.11
0.00
57.00
3.39
1.11
0.00
58.00
3.39
1.11
0.00
59.00
3.39
1.11
0.00
60.00
3.39
1.11
0.00
61.00
3.39
1.11
0.00
62.00
3.39
1.11
0.00
63.00
3.39
1.11
0.00
64.00
3.39
1.11
0.00
65.00
3.39
1.11
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
1.11
0.00
67.00
3.39
1.11
0.00
68.00
3.39
1.11
0.00
69.00
3.39
1.11
0.00
70.00
3.39
1.11
0.00
71.00
3.39
1.11
0.00
72.00
3.39
1.11
0.00
73.00
3.39
1.11
0.00
74.00
3.39
1.11
0.00
75.00
3.39
1.11
0.00
76.00
3.39
1.11
0.00
77.00
3.39
1.11
0.00
78.00
3.39
1.11
0.00
79.00
3.39
1.11
0.00
80.00
3.39
1.11
0.00
81.00
3.39
1.11
0.00
82.00
3.39
1.11
0.00
83.00
3.39
1.11
0.00
84.00
3.39
1.11
0.00
85.00
3.39
1.11
0.00
86.00
3.39
1.11
0.00
87.00
3.39
1.11
0.00
88.00
3.39
1.11
0.00
89.00
3.39
1.11
0.00
90.00
3.39
1.11
0.00
91.00
3.39
1.11
0.00
92.00
3.39
1.11
0.00
93.00
3.39
1.11
0.00
94.00
3.39
1.11
0.00
95.00
3.39
1.11
0.00
96.00
3.39
1.11
0.00
97.00
3.39
1.11
0.00
98.00
3.39
1.11
0.00
99.00
3.39
1.11
0.00
100.00
3.39
1.11
0.00
101.00
3.39
1.11
0.00
102.00
3.39
1.11
0.00
103.00
3.39
1.11
0.00
104.00
3.39
1.11
0.00
105.00
3.39
1.11
0.00
106.00
3.39
1.11
0.00
107.00
3.39
1.11
0.00
108.00
3.39
1.11
0.00
109.00
3.39
1.11
0.00
110.00
3.39
1.11
0.00
111.00
3.39
1.11
0.00
112.00
3.39
1.11
0.00
113.00
3.39
1.11
0.00
114.00
3.39
1.11
0.00
115.00
3.39
1.11
0.00
116.00
3.39
1.11
0.00
117.00
3.39
1.11
0.00
118.00
3.39
1.11
0.00
119.00
3.39
1.11
0.00
120.00
3.39
1.11
0.00

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 6
Summary for Subcatchment 5S: PRE (OUTFALL #2)
Runoff = 67.67 cfs @ 12.16 hrs, Volume= 5.615 af, Depth= 1.16"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN Description
10.200 55 Woods, Good, HSG B
47.660 78 Row crops, straight row, Good, HSG B
57.860 74 Weighted Average
57.860 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 5S: PRE (OUTFALL #2)
Hydrograph
75 ■Runoff
70
67.67 cfs -1 T --T ------------ ----T--T--r--r--I------1 -1 T --T--F
----
65 yM p_ r
--r- -i--r--r--r--r--r--r--i--r--r--r--r--r--r--r--i--r--r--r--r--r--
60------------------'___2vrr24hrRai_nfaIIT3.39
55 50 RLthoff Ar6ay67.864 -at
-- - 1 Mnpff-Volr1 a=5-00 '-T- -
45
---- - - - - ----------4--r--�--I---I----------�--
Runoff DepthT1.�16�"
--T--------�-------T--T--T----r-------�--TT--T--T - -T
--
LL 35 -TT T TFlb -Lin t = �1-62'--
-- - 1--L-----1---1-- 1--1-- -- -
30 T Q
--r----r--r--r--r--r--r----r--r--r--r--r--r--r--i 1 q=�I iJ min--
25
20 N=74 -
15
10
5 I I I 1 I I
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 7
Hydrograph for Subcatchment 5S: PRE (OUTFALL #2)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.00
8.00
0.41
0.00
0.00
9.00
0.50
0.00
0.00
10.00
0.61
0.00
0.00
11.00
0.80
0.00
0.18
12.00
2.25
0.47
36.41
13.00
2.62
0.68
9.45
14.00
2.78
0.77
5.20
15.00
2.89
0.84
3.94
16.00
2.98
0.90
3.15
17.00
3.06
0.94
2.70
18.00
3.12
0.99
2.41
19.00
3.18
1.02
2.11
20.00
3.23
1.06
1.81
21.00
3.27
1.08
1.67
22.00
3.31
1.11
1.61
23.00
3.35
1.14
1.55
24.00
3.39
1.16
1.50
25.00
3.39
1.16
0.01
26.00
3.39
1.16
0.00
27.00
3.39
1.16
0.00
28.00
3.39
1.16
0.00
29.00
3.39
1.16
0.00
30.00
3.39
1.16
0.00
31.00
3.39
1.16
0.00
32.00
3.39
1.16
0.00
33.00
3.39
1.16
0.00
34.00
3.39
1.16
0.00
35.00
3.39
1.16
0.00
36.00
3.39
1.16
0.00
37.00
3.39
1.16
0.00
38.00
3.39
1.16
0.00
39.00
3.39
1.16
0.00
40.00
3.39
1.16
0.00
41.00
3.39
1.16
0.00
42.00
3.39
1.16
0.00
43.00
3.39
1.16
0.00
44.00
3.39
1.16
0.00
45.00
3.39
1.16
0.00
46.00
3.39
1.16
0.00
47.00
3.39
1.16
0.00
48.00
3.39
1.16
0.00
49.00
3.39
1.16
0.00
50.00
3.39
1.16
0.00
51.00
3.39
1.16
0.00
52.00
3.39
1.16
0.00
53.00
3.39
1.16
0.00
54.00
3.39
1.16
0.00
55.00
3.39
1.16
0.00
56.00
3.39
1.16
0.00
57.00
3.39
1.16
0.00
58.00
3.39
1.16
0.00
59.00
3.39
1.16
0.00
60.00
3.39
1.16
0.00
61.00
3.39
1.16
0.00
62.00
3.39
1.16
0.00
63.00
3.39
1.16
0.00
64.00
3.39
1.16
0.00
65.00
3.39
1.16
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
1.16
0.00
67.00
3.39
1.16
0.00
68.00
3.39
1.16
0.00
69.00
3.39
1.16
0.00
70.00
3.39
1.16
0.00
71.00
3.39
1.16
0.00
72.00
3.39
1.16
0.00
73.00
3.39
1.16
0.00
74.00
3.39
1.16
0.00
75.00
3.39
1.16
0.00
76.00
3.39
1.16
0.00
77.00
3.39
1.16
0.00
78.00
3.39
1.16
0.00
79.00
3.39
1.16
0.00
80.00
3.39
1.16
0.00
81.00
3.39
1.16
0.00
82.00
3.39
1.16
0.00
83.00
3.39
1.16
0.00
84.00
3.39
1.16
0.00
85.00
3.39
1.16
0.00
86.00
3.39
1.16
0.00
87.00
3.39
1.16
0.00
88.00
3.39
1.16
0.00
89.00
3.39
1.16
0.00
90.00
3.39
1.16
0.00
91.00
3.39
1.16
0.00
92.00
3.39
1.16
0.00
93.00
3.39
1.16
0.00
94.00
3.39
1.16
0.00
95.00
3.39
1.16
0.00
96.00
3.39
1.16
0.00
97.00
3.39
1.16
0.00
98.00
3.39
1.16
0.00
99.00
3.39
1.16
0.00
100.00
3.39
1.16
0.00
101.00
3.39
1.16
0.00
102.00
3.39
1.16
0.00
103.00
3.39
1.16
0.00
104.00
3.39
1.16
0.00
105.00
3.39
1.16
0.00
106.00
3.39
1.16
0.00
107.00
3.39
1.16
0.00
108.00
3.39
1.16
0.00
109.00
3.39
1.16
0.00
110.00
3.39
1.16
0.00
111.00
3.39
1.16
0.00
112.00
3.39
1.16
0.00
113.00
3.39
1.16
0.00
114.00
3.39
1.16
0.00
115.00
3.39
1.16
0.00
116.00
3.39
1.16
0.00
117.00
3.39
1.16
0.00
118.00
3.39
1.16
0.00
119.00
3.39
1.16
0.00
120.00
3.39
1.16
0.00

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 8
Summary for Subcatchment 6S: PRE (OUTFALL #3)
Runoff = 16.42 cfs @ 12.16 hrs, Volume= 1.376 af, Depth= 1.11"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN Description
3.190 55 Woods, Good, HSG B
11.740 78 Row crops, straight row, Good, HSG B
14.930 73 Weighted Average
14.930 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 6S: PRE (OUTFALL #3)
Hydrograph
18 ■Runoff
17
16.42 cfs--T --T --------------T-- T-- T - -T -----------T--T--T --
T--
16 --i-- ti--y--+--r--r--r---------rt--rt--+--r--r--i---i
15 --'�-- --- -- -- ------------ -- -- -2,yrr24htRainfafha.391`-
14-
Runnff �r�ay 1 #-.9�3II arc -
13 --'-- -'---L--L----1---1---1--J--1--L- r
1 1 1 1
12- -- -- -- -- - -- --1 unpff'-Vplurn,e=1.$7$- 1-
11
---- -------------------------------------------------------------
,o - _-Roma#'Depth1:'71"-
3 g
--'i-- -'i----T--r--r--T-----i-- -- -- --r-- - - - - r-
o ,
- _ F16W L6n�th=1_ 1-62 - -
8 - --
7 - -- - -- -- -- --------I-- -- -- -- --r--'-----I��,'g-f-
s--------+------��-------------+----��-------T--�------�--
4N=73
4 --'-- -'----1--L--L--1---1---1--J--1--L--L--L--L-------L--L--L--L--L--
3
2
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 k 95 160 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 9
Hydrograph for Subcatchment 6S: PRE (OUTFALL #3)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.00
8.00
0.41
0.00
0.00
9.00
0.50
0.00
0.00
10.00
0.61
0.00
0.00
11.00
0.80
0.00
0.01
12.00
2.25
0.44
8.64
13.00
2.62
0.63
2.35
14.00
2.78
0.73
1.29
15.00
2.89
0.79
0.98
16.00
2.98
0.85
0.79
17.00
3.06
0.89
0.67
18.00
3.12
0.93
0.60
19.00
3.18
0.97
0.53
20.00
3.23
1.00
0.45
21.00
3.27
1.03
0.42
22.00
3.31
1.06
0.40
23.00
3.35
1.08
0.39
24.00
3.39
1.11
0.38
25.00
3.39
1.11
0.00
26.00
3.39
1.11
0.00
27.00
3.39
1.11
0.00
28.00
3.39
1.11
0.00
29.00
3.39
1.11
0.00
30.00
3.39
1.11
0.00
31.00
3.39
1.11
0.00
32.00
3.39
1.11
0.00
33.00
3.39
1.11
0.00
34.00
3.39
1.11
0.00
35.00
3.39
1.11
0.00
36.00
3.39
1.11
0.00
37.00
3.39
1.11
0.00
38.00
3.39
1.11
0.00
39.00
3.39
1.11
0.00
40.00
3.39
1.11
0.00
41.00
3.39
1.11
0.00
42.00
3.39
1.11
0.00
43.00
3.39
1.11
0.00
44.00
3.39
1.11
0.00
45.00
3.39
1.11
0.00
46.00
3.39
1.11
0.00
47.00
3.39
1.11
0.00
48.00
3.39
1.11
0.00
49.00
3.39
1.11
0.00
50.00
3.39
1.11
0.00
51.00
3.39
1.11
0.00
52.00
3.39
1.11
0.00
53.00
3.39
1.11
0.00
54.00
3.39
1.11
0.00
55.00
3.39
1.11
0.00
56.00
3.39
1.11
0.00
57.00
3.39
1.11
0.00
58.00
3.39
1.11
0.00
59.00
3.39
1.11
0.00
60.00
3.39
1.11
0.00
61.00
3.39
1.11
0.00
62.00
3.39
1.11
0.00
63.00
3.39
1.11
0.00
64.00
3.39
1.11
0.00
65.00
3.39
1.11
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
1.11
0.00
67.00
3.39
1.11
0.00
68.00
3.39
1.11
0.00
69.00
3.39
1.11
0.00
70.00
3.39
1.11
0.00
71.00
3.39
1.11
0.00
72.00
3.39
1.11
0.00
73.00
3.39
1.11
0.00
74.00
3.39
1.11
0.00
75.00
3.39
1.11
0.00
76.00
3.39
1.11
0.00
77.00
3.39
1.11
0.00
78.00
3.39
1.11
0.00
79.00
3.39
1.11
0.00
80.00
3.39
1.11
0.00
81.00
3.39
1.11
0.00
82.00
3.39
1.11
0.00
83.00
3.39
1.11
0.00
84.00
3.39
1.11
0.00
85.00
3.39
1.11
0.00
86.00
3.39
1.11
0.00
87.00
3.39
1.11
0.00
88.00
3.39
1.11
0.00
89.00
3.39
1.11
0.00
90.00
3.39
1.11
0.00
91.00
3.39
1.11
0.00
92.00
3.39
1.11
0.00
93.00
3.39
1.11
0.00
94.00
3.39
1.11
0.00
95.00
3.39
1.11
0.00
96.00
3.39
1.11
0.00
97.00
3.39
1.11
0.00
98.00
3.39
1.11
0.00
99.00
3.39
1.11
0.00
100.00
3.39
1.11
0.00
101.00
3.39
1.11
0.00
102.00
3.39
1.11
0.00
103.00
3.39
1.11
0.00
104.00
3.39
1.11
0.00
105.00
3.39
1.11
0.00
106.00
3.39
1.11
0.00
107.00
3.39
1.11
0.00
108.00
3.39
1.11
0.00
109.00
3.39
1.11
0.00
110.00
3.39
1.11
0.00
111.00
3.39
1.11
0.00
112.00
3.39
1.11
0.00
113.00
3.39
1.11
0.00
114.00
3.39
1.11
0.00
115.00
3.39
1.11
0.00
116.00
3.39
1.11
0.00
117.00
3.39
1.11
0.00
118.00
3.39
1.11
0.00
119.00
3.39
1.11
0.00
120.00
3.39
1.11
0.00

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 10
Summary for Subcatchment 7S: POST TO POND 3
Runoff = 58.17 cfs @ 11.95 hrs, Volume= 2.758 af, Depth= 2.17"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN
Description
11.010 98
Impervious
4.250 61
>75% Grass cover, Good, HSG B
15.260 88
Weighted Average
4.250
27.85% Pervious Area
11.010
72.15% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 7S: POST TO POND 3
Hydrograph
65 Runoff
58.17 cfs-----r--r-------------------t--r--
r---------,--rt--r--r-
60I I I
-I------,--7--r--r--------I--1--7--7--T--r--r--I---ITy1_N=hr -
55
-- --
so T--T --T- ------'I----T--T-4rr2�hr-RainfalrT3.39'F-
I I I I I I I I I I I I
---- - -
--I-- T --r --T T--T-Ruhoff Aroa=16.260 ad -
45
--r-
---- -- -- ------------ -- -- --T -- --------- -- -- -- -- --
40 �R0 n Offl Vp 14 m�Ie=2. 5 Calf
--I--
35 Runoff IDcpthT2.1171" .... I I
LL 3o Tc"5.0 M i n
--I -- --I-- --I - -
25
I I
20
---------- --r--i--------------- --r--i--------------- --r--i --
15
10
5
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 11
Hydrograph for Subcatchment 7S: POST TO POND 3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.08
8.00
0.41
0.01
0.19
9.00
0.50
0.03
0.42
10.00
0.61
0.07
0.71
11.00
0.80
0.15
1.68
12.00
2.25
1.17
49.95
13.00
2.62
1.48
2.93
14.00
2.78
1.62
1.76
15.00
2.89
1.72
1.41
16.00
2.98
1.80
1.09
17.00
3.06
1.87
0.96
18.00
3.12
1.93
0.85
19.00
3.18
1.98
0.73
20.00
3.23
2.02
0.62
21.00
3.27
2.06
0.59
22.00
3.31
2.10
0.57
23.00
3.35
2.13
0.55
24.00
3.39
2.17
0.52
25.00
3.39
2.17
0.00
26.00
3.39
2.17
0.00
27.00
3.39
2.17
0.00
28.00
3.39
2.17
0.00
29.00
3.39
2.17
0.00
30.00
3.39
2.17
0.00
31.00
3.39
2.17
0.00
32.00
3.39
2.17
0.00
33.00
3.39
2.17
0.00
34.00
3.39
2.17
0.00
35.00
3.39
2.17
0.00
36.00
3.39
2.17
0.00
37.00
3.39
2.17
0.00
38.00
3.39
2.17
0.00
39.00
3.39
2.17
0.00
40.00
3.39
2.17
0.00
41.00
3.39
2.17
0.00
42.00
3.39
2.17
0.00
43.00
3.39
2.17
0.00
44.00
3.39
2.17
0.00
45.00
3.39
2.17
0.00
46.00
3.39
2.17
0.00
47.00
3.39
2.17
0.00
48.00
3.39
2.17
0.00
49.00
3.39
2.17
0.00
50.00
3.39
2.17
0.00
51.00
3.39
2.17
0.00
52.00
3.39
2.17
0.00
53.00
3.39
2.17
0.00
54.00
3.39
2.17
0.00
55.00
3.39
2.17
0.00
56.00
3.39
2.17
0.00
57.00
3.39
2.17
0.00
58.00
3.39
2.17
0.00
59.00
3.39
2.17
0.00
60.00
3.39
2.17
0.00
61.00
3.39
2.17
0.00
62.00
3.39
2.17
0.00
63.00
3.39
2.17
0.00
64.00
3.39
2.17
0.00
65.00
3.39
2.17
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
2.17
0.00
67.00
3.39
2.17
0.00
68.00
3.39
2.17
0.00
69.00
3.39
2.17
0.00
70.00
3.39
2.17
0.00
71.00
3.39
2.17
0.00
72.00
3.39
2.17
0.00
73.00
3.39
2.17
0.00
74.00
3.39
2.17
0.00
75.00
3.39
2.17
0.00
76.00
3.39
2.17
0.00
77.00
3.39
2.17
0.00
78.00
3.39
2.17
0.00
79.00
3.39
2.17
0.00
80.00
3.39
2.17
0.00
81.00
3.39
2.17
0.00
82.00
3.39
2.17
0.00
83.00
3.39
2.17
0.00
84.00
3.39
2.17
0.00
85.00
3.39
2.17
0.00
86.00
3.39
2.17
0.00
87.00
3.39
2.17
0.00
88.00
3.39
2.17
0.00
89.00
3.39
2.17
0.00
90.00
3.39
2.17
0.00
91.00
3.39
2.17
0.00
92.00
3.39
2.17
0.00
93.00
3.39
2.17
0.00
94.00
3.39
2.17
0.00
95.00
3.39
2.17
0.00
96.00
3.39
2.17
0.00
97.00
3.39
2.17
0.00
98.00
3.39
2.17
0.00
99.00
3.39
2.17
0.00
100.00
3.39
2.17
0.00
101.00
3.39
2.17
0.00
102.00
3.39
2.17
0.00
103.00
3.39
2.17
0.00
104.00
3.39
2.17
0.00
105.00
3.39
2.17
0.00
106.00
3.39
2.17
0.00
107.00
3.39
2.17
0.00
108.00
3.39
2.17
0.00
109.00
3.39
2.17
0.00
110.00
3.39
2.17
0.00
111.00
3.39
2.17
0.00
112.00
3.39
2.17
0.00
113.00
3.39
2.17
0.00
114.00
3.39
2.17
0.00
115.00
3.39
2.17
0.00
116.00
3.39
2.17
0.00
117.00
3.39
2.17
0.00
118.00
3.39
2.17
0.00
119.00
3.39
2.17
0.00
120.00
3.39
2.17
0.00

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 12
Summary for Subcatchment 9S: POST TO POND 4
Runoff = 38.86 cfs @ 11.96 hrs, Volume= 1.832 af, Depth= 2.08"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN Description
7.330 98 Impervious
3.220 61 >75% Grass cover, Good, HSG B
10.550 87 Weighted Average
3.220 30.52% Pervious Area
7.330 69.48% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 9S: POST TO POND 4
Hydrograph
42+--+--+--r--r--i---i--�--�--�--+--r--r--r--i--+--�--+--r--+-- � Runoff
3886 cfs
40 .
--,------- - - - - ---------------- - - - -
----,----
38 --��-- ---- -- -- �� --�� --��---------- -- -- �� --�� --��----- �,TY;�le424-fa� -
36 --'-- --'----1--L--L--1---1---'--------L--L--L--1---1--J----1--L--r--
2,Yrr24h-r Rainfalt;;3.391,
32 --Ir- --li----7--r--r--Ir--Ir--li-- -- -- -
30 - - -- -- -- - - -- -- _Ruioff-►ra�.v51 at -
28 ---- ---- -- -- --------------- -
26 --'-- --'----1--L------------J--1--1p1O*e=1: 3 -
24 - -- ----+--+-- -- -- ----+--Rtmoff�DethT2.8..
22 --I------T-- T--r - -r - -I---------T--T--r--r--r--1---1--Tr �/+T-T--.r�,-,-F--
LL 20 --i-- --1 I -- I --i--------I -- -- -- I--i---i-- 1 \iT - lillfh--
I I I I I I I I I
18 ---- ---- -- -- --------------- -- --i
16
N=8
14 --r-----y--+--r--r--r-------y--rt--rt--+--r--r--r----y----+--r--r--
12
�--T-- T-- r - -r--r --i---i--T--T--T--r--r--r--r--i--T--T--T--r--r--
10 --i - -i---- --i --i-----i---- --i --i-----i-- --i
--'-- -1--1--1--L--L--1---1---1--J--1--1--L--L--L--1---1--J--1--1--L--r--
6 --i-- -i-- --+-- ----------i-- -- -- -- -- -------i-- -- --+-- -- --
4 --r----r--r--r--r--r--r----r--r--r--r--r--r--r----r--r--r--r--r--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 13
Hydrograph for Subcatchment 9S: POST TO POND 4
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.03
8.00
0.41
0.01
0.10
9.00
0.50
0.02
0.24
10.00
0.61
0.05
0.43
11.00
0.80
0.12
1.06
12.00
2.25
1.10
33.49
13.00
2.62
1.41
1.98
14.00
2.78
1.55
1.19
15.00
2.89
1.65
0.95
16.00
2.98
1.72
0.74
17.00
3.06
1.79
0.65
18.00
3.12
1.85
0.58
19.00
3.18
1.90
0.50
20.00
3.23
1.94
0.42
21.00
3.27
1.98
0.40
22.00
3.31
2.01
0.39
23.00
3.35
2.05
0.37
24.00
3.39
2.08
0.35
25.00
3.39
2.08
0.00
26.00
3.39
2.08
0.00
27.00
3.39
2.08
0.00
28.00
3.39
2.08
0.00
29.00
3.39
2.08
0.00
30.00
3.39
2.08
0.00
31.00
3.39
2.08
0.00
32.00
3.39
2.08
0.00
33.00
3.39
2.08
0.00
34.00
3.39
2.08
0.00
35.00
3.39
2.08
0.00
36.00
3.39
2.08
0.00
37.00
3.39
2.08
0.00
38.00
3.39
2.08
0.00
39.00
3.39
2.08
0.00
40.00
3.39
2.08
0.00
41.00
3.39
2.08
0.00
42.00
3.39
2.08
0.00
43.00
3.39
2.08
0.00
44.00
3.39
2.08
0.00
45.00
3.39
2.08
0.00
46.00
3.39
2.08
0.00
47.00
3.39
2.08
0.00
48.00
3.39
2.08
0.00
49.00
3.39
2.08
0.00
50.00
3.39
2.08
0.00
51.00
3.39
2.08
0.00
52.00
3.39
2.08
0.00
53.00
3.39
2.08
0.00
54.00
3.39
2.08
0.00
55.00
3.39
2.08
0.00
56.00
3.39
2.08
0.00
57.00
3.39
2.08
0.00
58.00
3.39
2.08
0.00
59.00
3.39
2.08
0.00
60.00
3.39
2.08
0.00
61.00
3.39
2.08
0.00
62.00
3.39
2.08
0.00
63.00
3.39
2.08
0.00
64.00
3.39
2.08
0.00
65.00
3.39
2.08
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
2.08
0.00
67.00
3.39
2.08
0.00
68.00
3.39
2.08
0.00
69.00
3.39
2.08
0.00
70.00
3.39
2.08
0.00
71.00
3.39
2.08
0.00
72.00
3.39
2.08
0.00
73.00
3.39
2.08
0.00
74.00
3.39
2.08
0.00
75.00
3.39
2.08
0.00
76.00
3.39
2.08
0.00
77.00
3.39
2.08
0.00
78.00
3.39
2.08
0.00
79.00
3.39
2.08
0.00
80.00
3.39
2.08
0.00
81.00
3.39
2.08
0.00
82.00
3.39
2.08
0.00
83.00
3.39
2.08
0.00
84.00
3.39
2.08
0.00
85.00
3.39
2.08
0.00
86.00
3.39
2.08
0.00
87.00
3.39
2.08
0.00
88.00
3.39
2.08
0.00
89.00
3.39
2.08
0.00
90.00
3.39
2.08
0.00
91.00
3.39
2.08
0.00
92.00
3.39
2.08
0.00
93.00
3.39
2.08
0.00
94.00
3.39
2.08
0.00
95.00
3.39
2.08
0.00
96.00
3.39
2.08
0.00
97.00
3.39
2.08
0.00
98.00
3.39
2.08
0.00
99.00
3.39
2.08
0.00
100.00
3.39
2.08
0.00
101.00
3.39
2.08
0.00
102.00
3.39
2.08
0.00
103.00
3.39
2.08
0.00
104.00
3.39
2.08
0.00
105.00
3.39
2.08
0.00
106.00
3.39
2.08
0.00
107.00
3.39
2.08
0.00
108.00
3.39
2.08
0.00
109.00
3.39
2.08
0.00
110.00
3.39
2.08
0.00
111.00
3.39
2.08
0.00
112.00
3.39
2.08
0.00
113.00
3.39
2.08
0.00
114.00
3.39
2.08
0.00
115.00
3.39
2.08
0.00
116.00
3.39
2.08
0.00
117.00
3.39
2.08
0.00
118.00
3.39
2.08
0.00
119.00
3.39
2.08
0.00
120.00
3.39
2.08
0.00

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 14
Summary for Subcatchment 12S: POST TO POND 1
Runoff = 126.02 cfs @ 11.95 hrs, Volume= 6.060 af, Depth= 2.35"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN
Description
24.280 98
Impervious
6.730 61
>75% Grass cover, Good, HSG B
31.010 90
Weighted Average
6.730
21.70% Pervious Area
24.280
78.30% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 12S: POST TO POND 1
Hydrograph
140 Runoff
126.02 cfs--t--r--r--�--r--,--rt--r--�---�---�--,--t--r--�---�---�--�--rt-
130 I I � � � � �
---- �7 p FF�}
---- -- ------------ -- ------------ -- --, 1�" 1f24
120
- -'- - - J - - 1 - - - -1 - - J - - -I- - L - - L - -'- - -'- - -' - - -1- - L - - L - -'- - -'- - -' - - 1 - - L - -
110 2 r-r24hr R'ainfarll�3.39�"
100 Ruhoff Arda=31.010 aid
--r--r--r--r--r--r--i--r--r--t--r--r--i--�i-{-�r--r--r--r--ic--i-c-rt--+--
u 80 --'-- -'-- -- ----------'-- - - _ --Runoff =
- - - - - F�t��off 1Depfh��.�3F" -
0 70 - -- ------ -- --' --'-- -- --+----------'-- -- -- -Tc= 5:Q-Miit-
LL 60
50 =
40
30
20
--r- r--r--+--r--r--i--r--r--t--r--r--i---i--r--+--r--r--i---i--r--+--
10
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 15
Hydrograph for Subcatchment 12S: POST TO POND 1
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.14
7.00
0.34
0.01
0.36
8.00
0.41
0.03
0.60
9.00
0.50
0.05
1.16
10.00
0.61
0.10
1.83
11.00
0.80
0.20
4.06
12.00
2.25
1.31
107.48
13.00
2.62
1.64
6.19
14.00
2.78
1.78
3.71
15.00
2.89
1.89
2.96
16.00
2.98
1.97
2.29
17.00
3.06
2.04
2.02
18.00
3.12
2.10
1.78
19.00
3.18
2.15
1.54
20.00
3.23
2.19
1.30
21.00
3.27
2.23
1.23
22.00
3.31
2.27
1.19
23.00
3.35
2.31
1.14
24.00
3.39
2.35
1.09
25.00
3.39
2.35
0.00
26.00
3.39
2.35
0.00
27.00
3.39
2.35
0.00
28.00
3.39
2.35
0.00
29.00
3.39
2.35
0.00
30.00
3.39
2.35
0.00
31.00
3.39
2.35
0.00
32.00
3.39
2.35
0.00
33.00
3.39
2.35
0.00
34.00
3.39
2.35
0.00
35.00
3.39
2.35
0.00
36.00
3.39
2.35
0.00
37.00
3.39
2.35
0.00
38.00
3.39
2.35
0.00
39.00
3.39
2.35
0.00
40.00
3.39
2.35
0.00
41.00
3.39
2.35
0.00
42.00
3.39
2.35
0.00
43.00
3.39
2.35
0.00
44.00
3.39
2.35
0.00
45.00
3.39
2.35
0.00
46.00
3.39
2.35
0.00
47.00
3.39
2.35
0.00
48.00
3.39
2.35
0.00
49.00
3.39
2.35
0.00
50.00
3.39
2.35
0.00
51.00
3.39
2.35
0.00
52.00
3.39
2.35
0.00
53.00
3.39
2.35
0.00
54.00
3.39
2.35
0.00
55.00
3.39
2.35
0.00
56.00
3.39
2.35
0.00
57.00
3.39
2.35
0.00
58.00
3.39
2.35
0.00
59.00
3.39
2.35
0.00
60.00
3.39
2.35
0.00
61.00
3.39
2.35
0.00
62.00
3.39
2.35
0.00
63.00
3.39
2.35
0.00
64.00
3.39
2.35
0.00
65.00
3.39
2.35
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
2.35
0.00
67.00
3.39
2.35
0.00
68.00
3.39
2.35
0.00
69.00
3.39
2.35
0.00
70.00
3.39
2.35
0.00
71.00
3.39
2.35
0.00
72.00
3.39
2.35
0.00
73.00
3.39
2.35
0.00
74.00
3.39
2.35
0.00
75.00
3.39
2.35
0.00
76.00
3.39
2.35
0.00
77.00
3.39
2.35
0.00
78.00
3.39
2.35
0.00
79.00
3.39
2.35
0.00
80.00
3.39
2.35
0.00
81.00
3.39
2.35
0.00
82.00
3.39
2.35
0.00
83.00
3.39
2.35
0.00
84.00
3.39
2.35
0.00
85.00
3.39
2.35
0.00
86.00
3.39
2.35
0.00
87.00
3.39
2.35
0.00
88.00
3.39
2.35
0.00
89.00
3.39
2.35
0.00
90.00
3.39
2.35
0.00
91.00
3.39
2.35
0.00
92.00
3.39
2.35
0.00
93.00
3.39
2.35
0.00
94.00
3.39
2.35
0.00
95.00
3.39
2.35
0.00
96.00
3.39
2.35
0.00
97.00
3.39
2.35
0.00
98.00
3.39
2.35
0.00
99.00
3.39
2.35
0.00
100.00
3.39
2.35
0.00
101.00
3.39
2.35
0.00
102.00
3.39
2.35
0.00
103.00
3.39
2.35
0.00
104.00
3.39
2.35
0.00
105.00
3.39
2.35
0.00
106.00
3.39
2.35
0.00
107.00
3.39
2.35
0.00
108.00
3.39
2.35
0.00
109.00
3.39
2.35
0.00
110.00
3.39
2.35
0.00
111.00
3.39
2.35
0.00
112.00
3.39
2.35
0.00
113.00
3.39
2.35
0.00
114.00
3.39
2.35
0.00
115.00
3.39
2.35
0.00
116.00
3.39
2.35
0.00
117.00
3.39
2.35
0.00
118.00
3.39
2.35
0.00
119.00
3.39
2.35
0.00
120.00
3.39
2.35
0.00

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 16
Summary for Subcatchment 14S: POST TO POND 6
Runoff = 54.59 cfs @ 11.95 hrs, Volume= 2.605 af, Depth= 2.26"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN
Description
10.310 98
Impervious
3.550 61
>75% Grass cover, Good, HSG B
13.860 89
Weighted Average
3.550
25.61 % Pervious Area
10.310
74.39% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 14S: POST TO POND 6
Hydrograph
60 Runoff
54.59 cfs--- - - - I -- -- -- - - -
I-- -- - -----'I---
ss
T--T--T--r--r--I---I-uY�-b��' -
50 I 2,yrr24h-r Raanfalt;;3.391"
45
-- --'-- L--L-----1---1--J--1--L-Ruhaoff Ar6&13,864at, -
40
-I-- --I-- -- -- - - ------I-- --RpnQff,V-Q1p1me=12 p0 elf -
H 35 1 1 1 1 1 1 1 1
w Run a#'1Depth=;2.267
3 30
T--T--T--r--T--1-----�\/��.10-11
25
-1----1--r--Y--r--r--r--1---1--r--r--r--r--r--r--r--1--r--r- �f�=8-
20
--i-- --i-- -- -- ----------i-- -- -- -- -- -------i-- -- -- -- -- --
15
--'-- -'----L--L--L--1---1---1--J--1--L--L--L--L-------L----L--L--L--
10
s
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 17
Hydrograph for Subcatchment 14S: POST TO POND 6
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.03
7.00
0.34
0.01
0.11
8.00
0.41
0.02
0.22
9.00
0.50
0.04
0.45
10.00
0.61
0.08
0.73
11.00
0.80
0.17
1.67
12.00
2.25
1.24
46.72
13.00
2.62
1.56
2.71
14.00
2.78
1.70
1.63
15.00
2.89
1.80
1.30
16.00
2.98
1.88
1.01
17.00
3.06
1.95
0.89
18.00
3.12
2.01
0.78
19.00
3.18
2.06
0.68
20.00
3.23
2.11
0.57
21.00
3.27
2.15
0.54
22.00
3.31
2.18
0.52
23.00
3.35
2.22
0.50
24.00
3.39
2.26
0.48
25.00
3.39
2.26
0.00
26.00
3.39
2.26
0.00
27.00
3.39
2.26
0.00
28.00
3.39
2.26
0.00
29.00
3.39
2.26
0.00
30.00
3.39
2.26
0.00
31.00
3.39
2.26
0.00
32.00
3.39
2.26
0.00
33.00
3.39
2.26
0.00
34.00
3.39
2.26
0.00
35.00
3.39
2.26
0.00
36.00
3.39
2.26
0.00
37.00
3.39
2.26
0.00
38.00
3.39
2.26
0.00
39.00
3.39
2.26
0.00
40.00
3.39
2.26
0.00
41.00
3.39
2.26
0.00
42.00
3.39
2.26
0.00
43.00
3.39
2.26
0.00
44.00
3.39
2.26
0.00
45.00
3.39
2.26
0.00
46.00
3.39
2.26
0.00
47.00
3.39
2.26
0.00
48.00
3.39
2.26
0.00
49.00
3.39
2.26
0.00
50.00
3.39
2.26
0.00
51.00
3.39
2.26
0.00
52.00
3.39
2.26
0.00
53.00
3.39
2.26
0.00
54.00
3.39
2.26
0.00
55.00
3.39
2.26
0.00
56.00
3.39
2.26
0.00
57.00
3.39
2.26
0.00
58.00
3.39
2.26
0.00
59.00
3.39
2.26
0.00
60.00
3.39
2.26
0.00
61.00
3.39
2.26
0.00
62.00
3.39
2.26
0.00
63.00
3.39
2.26
0.00
64.00
3.39
2.26
0.00
65.00
3.39
2.26
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
2.26
0.00
67.00
3.39
2.26
0.00
68.00
3.39
2.26
0.00
69.00
3.39
2.26
0.00
70.00
3.39
2.26
0.00
71.00
3.39
2.26
0.00
72.00
3.39
2.26
0.00
73.00
3.39
2.26
0.00
74.00
3.39
2.26
0.00
75.00
3.39
2.26
0.00
76.00
3.39
2.26
0.00
77.00
3.39
2.26
0.00
78.00
3.39
2.26
0.00
79.00
3.39
2.26
0.00
80.00
3.39
2.26
0.00
81.00
3.39
2.26
0.00
82.00
3.39
2.26
0.00
83.00
3.39
2.26
0.00
84.00
3.39
2.26
0.00
85.00
3.39
2.26
0.00
86.00
3.39
2.26
0.00
87.00
3.39
2.26
0.00
88.00
3.39
2.26
0.00
89.00
3.39
2.26
0.00
90.00
3.39
2.26
0.00
91.00
3.39
2.26
0.00
92.00
3.39
2.26
0.00
93.00
3.39
2.26
0.00
94.00
3.39
2.26
0.00
95.00
3.39
2.26
0.00
96.00
3.39
2.26
0.00
97.00
3.39
2.26
0.00
98.00
3.39
2.26
0.00
99.00
3.39
2.26
0.00
100.00
3.39
2.26
0.00
101.00
3.39
2.26
0.00
102.00
3.39
2.26
0.00
103.00
3.39
2.26
0.00
104.00
3.39
2.26
0.00
105.00
3.39
2.26
0.00
106.00
3.39
2.26
0.00
107.00
3.39
2.26
0.00
108.00
3.39
2.26
0.00
109.00
3.39
2.26
0.00
110.00
3.39
2.26
0.00
111.00
3.39
2.26
0.00
112.00
3.39
2.26
0.00
113.00
3.39
2.26
0.00
114.00
3.39
2.26
0.00
115.00
3.39
2.26
0.00
116.00
3.39
2.26
0.00
117.00
3.39
2.26
0.00
118.00
3.39
2.26
0.00
119.00
3.39
2.26
0.00
120.00
3.39
2.26
0.00

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 18
Summary for Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Runoff = 23.02 cfs @ 11.97 hrs, Volume= 1.084 af, Depth= 1.05"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac) CN Description
3.800 98 Impervious
8.590 61 >75% Grass cover, Good, HSG B
12.390 72 Weighted Average
8.590 69.33% Pervious Area
3.800 30.67% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Hydrograph
--r-------r--r--r--r--r--------1 -t r--r--r--r--r----r--r--r--r--r--
25
24-- --'i --'i --'i--------'i-- -- --'i --'i --'i--------'i-- -- --'i --'i -- Runoff
23.02 Cfs--+--+------------ -- ----+--+---------+----+--+-- --
�/ p �j �j
22 --i------+--+--+--+----------+--+--+--+--r--+--i---i
21 ---- ------ --'i --'i --'i--------'-- -- _ rr
20 '--Z'YKrF24hfRc'fJ fat[#139;1
19 --'--
18 RLthOff Ar6atl 2.390 -at -
17 --'-- --'-- -- -- ----------'---- - gip- {---+---------'-- ---Q- --� --
16 --�------+--+--+--+----------+--+-- R"Yff �����@3� Y�4
w 14 --i-- --i-- -------------------'i-- -- -- i------------i--------------i---
---- --+-----'--- -- -- +--Rtmgf�'�DpthT9:06
0 12 ---- ---- --+-- ------------ -- -- -- -- --
------
-- �-�
LL11 ------------------------------------------------- - -- - - ----- ----
10 --i-- --i----+--+----------i-- -- -- --+-- ---------+-- -
g --'----'----------------------?--?-----'---�--------
-
- -��-
7 --�-- --�-- -- -- -------------- -- -- -- --i--------i-- -- -- --�i --
6 --i-- -i-- --+-- ----------i-- -- -- -- -- -------i-- -- --+-- -- --
5 --i --- -- -- -- -
4 --i-- -i--+--+--+--+--i---i---i--+--+--+--+--+--+--i---i--+--+--+--+--+--
3 --�,-- ----- -- --�, --�,--------�,-- -- -- -- --�,--------�,-- -- -- --�, --
2--------+-----------------------------------+----�--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 19
Hydrograph for Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.00
8.00
0.41
0.00
0.00
9.00
0.50
0.00
0.00
10.00
0.61
0.00
0.00
11.00
0.80
0.00
0.01
12.00
2.25
0.40
21.07
13.00
2.62
0.59
1.48
14.00
2.78
0.68
0.92
15.00
2.89
0.75
0.75
16.00
2.98
0.80
0.59
17.00
3.06
0.84
0.53
18.00
3.12
0.88
0.47
19.00
3.18
0.92
0.41
20.00
3.23
0.95
0.35
21.00
3.27
0.97
0.33
22.00
3.31
1.00
0.32
23.00
3.35
1.03
0.31
24.00
3.39
1.05
0.30
25.00
3.39
1.05
0.00
26.00
3.39
1.05
0.00
27.00
3.39
1.05
0.00
28.00
3.39
1.05
0.00
29.00
3.39
1.05
0.00
30.00
3.39
1.05
0.00
31.00
3.39
1.05
0.00
32.00
3.39
1.05
0.00
33.00
3.39
1.05
0.00
34.00
3.39
1.05
0.00
35.00
3.39
1.05
0.00
36.00
3.39
1.05
0.00
37.00
3.39
1.05
0.00
38.00
3.39
1.05
0.00
39.00
3.39
1.05
0.00
40.00
3.39
1.05
0.00
41.00
3.39
1.05
0.00
42.00
3.39
1.05
0.00
43.00
3.39
1.05
0.00
44.00
3.39
1.05
0.00
45.00
3.39
1.05
0.00
46.00
3.39
1.05
0.00
47.00
3.39
1.05
0.00
48.00
3.39
1.05
0.00
49.00
3.39
1.05
0.00
50.00
3.39
1.05
0.00
51.00
3.39
1.05
0.00
52.00
3.39
1.05
0.00
53.00
3.39
1.05
0.00
54.00
3.39
1.05
0.00
55.00
3.39
1.05
0.00
56.00
3.39
1.05
0.00
57.00
3.39
1.05
0.00
58.00
3.39
1.05
0.00
59.00
3.39
1.05
0.00
60.00
3.39
1.05
0.00
61.00
3.39
1.05
0.00
62.00
3.39
1.05
0.00
63.00
3.39
1.05
0.00
64.00
3.39
1.05
0.00
65.00
3.39
1.05
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
1.05
0.00
67.00
3.39
1.05
0.00
68.00
3.39
1.05
0.00
69.00
3.39
1.05
0.00
70.00
3.39
1.05
0.00
71.00
3.39
1.05
0.00
72.00
3.39
1.05
0.00
73.00
3.39
1.05
0.00
74.00
3.39
1.05
0.00
75.00
3.39
1.05
0.00
76.00
3.39
1.05
0.00
77.00
3.39
1.05
0.00
78.00
3.39
1.05
0.00
79.00
3.39
1.05
0.00
80.00
3.39
1.05
0.00
81.00
3.39
1.05
0.00
82.00
3.39
1.05
0.00
83.00
3.39
1.05
0.00
84.00
3.39
1.05
0.00
85.00
3.39
1.05
0.00
86.00
3.39
1.05
0.00
87.00
3.39
1.05
0.00
88.00
3.39
1.05
0.00
89.00
3.39
1.05
0.00
90.00
3.39
1.05
0.00
91.00
3.39
1.05
0.00
92.00
3.39
1.05
0.00
93.00
3.39
1.05
0.00
94.00
3.39
1.05
0.00
95.00
3.39
1.05
0.00
96.00
3.39
1.05
0.00
97.00
3.39
1.05
0.00
98.00
3.39
1.05
0.00
99.00
3.39
1.05
0.00
100.00
3.39
1.05
0.00
101.00
3.39
1.05
0.00
102.00
3.39
1.05
0.00
103.00
3.39
1.05
0.00
104.00
3.39
1.05
0.00
105.00
3.39
1.05
0.00
106.00
3.39
1.05
0.00
107.00
3.39
1.05
0.00
108.00
3.39
1.05
0.00
109.00
3.39
1.05
0.00
110.00
3.39
1.05
0.00
111.00
3.39
1.05
0.00
112.00
3.39
1.05
0.00
113.00
3.39
1.05
0.00
114.00
3.39
1.05
0.00
115.00
3.39
1.05
0.00
116.00
3.39
1.05
0.00
117.00
3.39
1.05
0.00
118.00
3.39
1.05
0.00
119.00
3.39
1.05
0.00
120.00
3.39
1.05
0.00

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 20
Summary for Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Runoff = 3.74 cfs @ 12.22 hrs, Volume= 0.504 af, Depth= 0.41"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac)
CN
Description
7.730
55
Woods, Good, HSG B
7.000
61
>75% Grass cover, Good, HSG B
14.730
58
Weighted Average
14.730
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Hydrograph
■ Runoff
4 3.74 cfs
Type 11'',24-h'',r
2vr+24hr RainfallT3.,39�
3 Ruhoff Arda=14.730 at
R4npff'', VQIL;me=',0.$04 1
- --- ----+---------- ----+--+-- _Runoff DepthT0.417-
2-
F16W'� Longth=1,16a'
Tc=�1.'$ mill
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 21
Hydrograph for Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.00
8.00
0.41
0.00
0.00
9.00
0.50
0.00
0.00
10.00
0.61
0.00
0.00
11.00
0.80
0.00
0.00
12.00
2.25
0.08
0.73
13.00
2.62
0.16
1.01
14.00
2.78
0.21
0.62
15.00
2.89
0.24
0.49
16.00
2.98
0.27
0.40
17.00
3.06
0.29
0.35
18.00
3.12
0.31
0.32
19.00
3.18
0.33
0.28
20.00
3.23
0.35
0.25
21.00
3.27
0.37
0.23
22.00
3.31
0.38
0.22
23.00
3.35
0.40
0.22
24.00
3.39
0.41
0.21
25.00
3.39
0.41
0.00
26.00
3.39
0.41
0.00
27.00
3.39
0.41
0.00
28.00
3.39
0.41
0.00
29.00
3.39
0.41
0.00
30.00
3.39
0.41
0.00
31.00
3.39
0.41
0.00
32.00
3.39
0.41
0.00
33.00
3.39
0.41
0.00
34.00
3.39
0.41
0.00
35.00
3.39
0.41
0.00
36.00
3.39
0.41
0.00
37.00
3.39
0.41
0.00
38.00
3.39
0.41
0.00
39.00
3.39
0.41
0.00
40.00
3.39
0.41
0.00
41.00
3.39
0.41
0.00
42.00
3.39
0.41
0.00
43.00
3.39
0.41
0.00
44.00
3.39
0.41
0.00
45.00
3.39
0.41
0.00
46.00
3.39
0.41
0.00
47.00
3.39
0.41
0.00
48.00
3.39
0.41
0.00
49.00
3.39
0.41
0.00
50.00
3.39
0.41
0.00
51.00
3.39
0.41
0.00
52.00
3.39
0.41
0.00
53.00
3.39
0.41
0.00
54.00
3.39
0.41
0.00
55.00
3.39
0.41
0.00
56.00
3.39
0.41
0.00
57.00
3.39
0.41
0.00
58.00
3.39
0.41
0.00
59.00
3.39
0.41
0.00
60.00
3.39
0.41
0.00
61.00
3.39
0.41
0.00
62.00
3.39
0.41
0.00
63.00
3.39
0.41
0.00
64.00
3.39
0.41
0.00
65.00
3.39
0.41
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
0.41
0.00
67.00
3.39
0.41
0.00
68.00
3.39
0.41
0.00
69.00
3.39
0.41
0.00
70.00
3.39
0.41
0.00
71.00
3.39
0.41
0.00
72.00
3.39
0.41
0.00
73.00
3.39
0.41
0.00
74.00
3.39
0.41
0.00
75.00
3.39
0.41
0.00
76.00
3.39
0.41
0.00
77.00
3.39
0.41
0.00
78.00
3.39
0.41
0.00
79.00
3.39
0.41
0.00
80.00
3.39
0.41
0.00
81.00
3.39
0.41
0.00
82.00
3.39
0.41
0.00
83.00
3.39
0.41
0.00
84.00
3.39
0.41
0.00
85.00
3.39
0.41
0.00
86.00
3.39
0.41
0.00
87.00
3.39
0.41
0.00
88.00
3.39
0.41
0.00
89.00
3.39
0.41
0.00
90.00
3.39
0.41
0.00
91.00
3.39
0.41
0.00
92.00
3.39
0.41
0.00
93.00
3.39
0.41
0.00
94.00
3.39
0.41
0.00
95.00
3.39
0.41
0.00
96.00
3.39
0.41
0.00
97.00
3.39
0.41
0.00
98.00
3.39
0.41
0.00
99.00
3.39
0.41
0.00
100.00
3.39
0.41
0.00
101.00
3.39
0.41
0.00
102.00
3.39
0.41
0.00
103.00
3.39
0.41
0.00
104.00
3.39
0.41
0.00
105.00
3.39
0.41
0.00
106.00
3.39
0.41
0.00
107.00
3.39
0.41
0.00
108.00
3.39
0.41
0.00
109.00
3.39
0.41
0.00
110.00
3.39
0.41
0.00
111.00
3.39
0.41
0.00
112.00
3.39
0.41
0.00
113.00
3.39
0.41
0.00
114.00
3.39
0.41
0.00
115.00
3.39
0.41
0.00
116.00
3.39
0.41
0.00
117.00
3.39
0.41
0.00
118.00
3.39
0.41
0.00
119.00
3.39
0.41
0.00
120.00
3.39
0.41
0.00

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 22
Summary for Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Runoff = 1.11 cfs @ 12.21 hrs, Volume= 0.140 af, Depth= 0.45"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 2yr-24hr Rainfall=3.39"
Area (ac)
CN
Description
3.190
55
Woods, Good, HSG B
0.580
78
Row crops, straight row, Good, HSG B
3.770
59
Weighted Average
3.770
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Hydrograph
� � � � � � � �� � � � � �� �� �� �� �� �� � � � � � ■Runoff
1.11 Cfs
II'24-h,r-
2yr+24hr RainfallT3.39,..
RUn6ffAiea=3.770 at
R4nOff',VQ1gme=0.�,140 calf
Runoff off ' D e pt h T0.45..
3 ROW' Longth=1,162v
0
Tc=�1.',9 mill
OW-59
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 11,0 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 23
Hydrograph for Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.07
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.16
0.00
0.00
5.00
0.21
0.00
0.00
6.00
0.27
0.00
0.00
7.00
0.34
0.00
0.00
8.00
0.41
0.00
0.00
9.00
0.50
0.00
0.00
10.00
0.61
0.00
0.00
11.00
0.80
0.00
0.00
12.00
2.25
0.09
0.25
13.00
2.62
0.18
0.28
14.00
2.78
0.23
0.17
15.00
2.89
0.27
0.13
16.00
2.98
0.30
0.11
17.00
3.06
0.32
0.10
18.00
3.12
0.35
0.09
19.00
3.18
0.37
0.08
20.00
3.23
0.38
0.07
21.00
3.27
0.40
0.06
22.00
3.31
0.42
0.06
23.00
3.35
0.43
0.06
24.00
3.39
0.45
0.06
25.00
3.39
0.45
0.00
26.00
3.39
0.45
0.00
27.00
3.39
0.45
0.00
28.00
3.39
0.45
0.00
29.00
3.39
0.45
0.00
30.00
3.39
0.45
0.00
31.00
3.39
0.45
0.00
32.00
3.39
0.45
0.00
33.00
3.39
0.45
0.00
34.00
3.39
0.45
0.00
35.00
3.39
0.45
0.00
36.00
3.39
0.45
0.00
37.00
3.39
0.45
0.00
38.00
3.39
0.45
0.00
39.00
3.39
0.45
0.00
40.00
3.39
0.45
0.00
41.00
3.39
0.45
0.00
42.00
3.39
0.45
0.00
43.00
3.39
0.45
0.00
44.00
3.39
0.45
0.00
45.00
3.39
0.45
0.00
46.00
3.39
0.45
0.00
47.00
3.39
0.45
0.00
48.00
3.39
0.45
0.00
49.00
3.39
0.45
0.00
50.00
3.39
0.45
0.00
51.00
3.39
0.45
0.00
52.00
3.39
0.45
0.00
53.00
3.39
0.45
0.00
54.00
3.39
0.45
0.00
55.00
3.39
0.45
0.00
56.00
3.39
0.45
0.00
57.00
3.39
0.45
0.00
58.00
3.39
0.45
0.00
59.00
3.39
0.45
0.00
60.00
3.39
0.45
0.00
61.00
3.39
0.45
0.00
62.00
3.39
0.45
0.00
63.00
3.39
0.45
0.00
64.00
3.39
0.45
0.00
65.00
3.39
0.45
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
3.39
0.45
0.00
67.00
3.39
0.45
0.00
68.00
3.39
0.45
0.00
69.00
3.39
0.45
0.00
70.00
3.39
0.45
0.00
71.00
3.39
0.45
0.00
72.00
3.39
0.45
0.00
73.00
3.39
0.45
0.00
74.00
3.39
0.45
0.00
75.00
3.39
0.45
0.00
76.00
3.39
0.45
0.00
77.00
3.39
0.45
0.00
78.00
3.39
0.45
0.00
79.00
3.39
0.45
0.00
80.00
3.39
0.45
0.00
81.00
3.39
0.45
0.00
82.00
3.39
0.45
0.00
83.00
3.39
0.45
0.00
84.00
3.39
0.45
0.00
85.00
3.39
0.45
0.00
86.00
3.39
0.45
0.00
87.00
3.39
0.45
0.00
88.00
3.39
0.45
0.00
89.00
3.39
0.45
0.00
90.00
3.39
0.45
0.00
91.00
3.39
0.45
0.00
92.00
3.39
0.45
0.00
93.00
3.39
0.45
0.00
94.00
3.39
0.45
0.00
95.00
3.39
0.45
0.00
96.00
3.39
0.45
0.00
97.00
3.39
0.45
0.00
98.00
3.39
0.45
0.00
99.00
3.39
0.45
0.00
100.00
3.39
0.45
0.00
101.00
3.39
0.45
0.00
102.00
3.39
0.45
0.00
103.00
3.39
0.45
0.00
104.00
3.39
0.45
0.00
105.00
3.39
0.45
0.00
106.00
3.39
0.45
0.00
107.00
3.39
0.45
0.00
108.00
3.39
0.45
0.00
109.00
3.39
0.45
0.00
110.00
3.39
0.45
0.00
111.00
3.39
0.45
0.00
112.00
3.39
0.45
0.00
113.00
3.39
0.45
0.00
114.00
3.39
0.45
0.00
115.00
3.39
0.45
0.00
116.00
3.39
0.45
0.00
117.00
3.39
0.45
0.00
118.00
3.39
0.45
0.00
119.00
3.39
0.45
0.00
120.00
3.39
0.45
0.00

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 24
Summary for Pond 2P: POND 2
Inflow Area = 27.080 ac, 79.03% Impervious, Inflow Depth = 2.35" for 2yr-24hr event
Inflow = 110.05 cfs @ 11.95 hrs, Volume= 5.292 of
Outflow = 6.93 cfs @ 12.65 hrs, Volume= 5.281 af, Atten= 94%, Lag= 41.8 min
Primary = 6.93 cfs @ 12.65 hrs, Volume= 5.281 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 715.30' @ 12.65 hrs Surf.Area= 30,496 sf Storage= 134,642 cf
Plug -Flow detention time= 693.1 min calculated for 5.279 of (100% of inflow)
Center -of -Mass det. time= 693.7 min ( 1,494.3 - 800.7 )
Volume Invert
Avail.Storage Storage Description
#1 710.00'
301,329 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
710.00
20,568
0 0
711.00
22,310
21,439 21,439
712.00
24,113
23,212 44,651
713.00
25,975
25,044 69,695
714.00
27,897
26,936 96,631
715.00
29,879
28,888 125,519
716.00
31,920
30,900 156,418
717.00
34,021
32,971 189,389
718.00
36,183
35,102 224,491
719.00
38,404
37,294 261,784
720.00
40,686
39,545 301,329
Device Routing
Invert
Outlet Devices
#1 Primary
709.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 709.39' / 709.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
710.00'
6.0" Vert. 6" Orifice C= 0.600
#3 Device 1
715.00'
36.0" W x 6.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1
718.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
718.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=6.93 cfs @ 12.65 hrs HW=715.30' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 6.93 cfs of 33.53 cfs potential flow)
2=6" Orifice (Orifice Controls 2.13 cfs @ 10.82 fps)
3=Orifice/Grate (Orifice Controls 4.80 cfs @ 1.76 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=710.00' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD® 10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 25
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1
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1
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:1 •1 •• • • 1

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 2P: POND 2
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
710.00
0.00
0.00
0.00
2.50
0.00
0
710.00
0.00
0.00
0.00
5.00
0.00
0
710.00
0.00
0.00
0.00
7.50
0.41
1,568
710.08
0.02
0.02
0.00
10.00
1.60
8,326
710.40
0.36
0.36
0.00
12.50
8.62
134,243
715.29
6.61
6.61
0.00
15.00
2.58
128,506
715.10
2.99
2.99
0.00
17.50
1.66
125,159
714.99
2.06
2.06
0.00
20.00
1.13
119,373
714.79
2.02
2.02
0.00
22.50
1.02
111,127
714.51
1.95
1.95
0.00
25.00
0.00
99,497
714.10
1.86
1.86
0.00
27.50
0.00
83,450
713.52
1.71
1.71
0.00
30.00
0.00
68,744
712.96
1.56
1.56
0.00
32.50
0.00
55,436
712.44
1.40
1.40
0.00
35.00
0.00
43,580
711.96
1.23
1.23
0.00
37.50
0.00
33,230
711.52
1.06
1.06
0.00
40.00
0.00
24,436
711.13
0.89
0.89
0.00
42.50
0.00
17,248
710.81
0.71
0.71
0.00
45.00
0.00
11,706
710.56
0.52
0.52
0.00
47.50
0.00
7,847
710.38
0.33
0.33
0.00
50.00
0.00
5,578
710.27
0.19
0.19
0.00
52.50
0.00
4,240
710.20
0.12
0.12
0.00
55.00
0.00
3,388
710.16
0.08
0.08
0.00
57.50
0.00
2,807
710.14
0.05
0.05
0.00
60.00
0.00
2,390
710.12
0.04
0.04
0.00
62.50
0.00
2,076
710.10
0.03
0.03
0.00
65.00
0.00
1,834
710.09
0.02
0.02
0.00
67.50
0.00
1,640
710.08
0.02
0.02
0.00
70.00
0.00
1,483
710.07
0.02
0.02
0.00
72.50
0.00
1,353
710.07
0.01
0.01
0.00
75.00
0.00
1,243
710.06
0.01
0.01
0.00
77.50
0.00
1,149
710.06
0.01
0.01
0.00
80.00
0.00
1,068
710.05
0.01
0.01
0.00
82.50
0.00
998
710.05
0.01
0.01
0.00
85.00
0.00
936
710.05
0.01
0.01
0.00
87.50
0.00
882
710.04
0.01
0.01
0.00
90.00
0.00
833
710.04
0.01
0.01
0.00
92.50
0.00
789
710.04
0.00
0.00
0.00
95.00
0.00
750
710.04
0.00
0.00
0.00
97.50
0.00
714
710.03
0.00
0.00
0.00
100.00
0.00
682
710.03
0.00
0.00
0.00
102.50
0.00
652
710.03
0.00
0.00
0.00
105.00
0.00
625
710.03
0.00
0.00
0.00
107.50
0.00
600
710.03
0.00
0.00
0.00
110.00
0.00
577
710.03
0.00
0.00
0.00
112.50
0.00
555
710.03
0.00
0.00
0.00
115.00
0.00
535
710.03
0.00
0.00
0.00
117.50
0.00
517
710.03
0.00
0.00
0.00
120.00
0.00
499
710.02
0.00
0.00
0.00
Type 1124-hr 2yr-24hr Rainfall=3.39"
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 27
Stage -Discharge for Pond 2P: POND 2
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
710.00
0.00
0.00
0.00
710.10
0.03
0.03
0.00
710.20
0.11
0.11
0.00
710.30
0.23
0.23
0.00
710.40
0.36
0.36
0.00
710.50
0.47
0.47
0.00
710.60
0.56
0.56
0.00
710.70
0.63
0.63
0.00
710.80
0.70
0.70
0.00
710.90
0.76
0.76
0.00
711.00
0.82
0.82
0.00
711.10
0.87
0.87
0.00
711.20
0.92
0.92
0.00
711.30
0.97
0.97
0.00
711.40
1.01
1.01
0.00
711.50
1.06
1.06
0.00
711.60
1.10
1.10
0.00
711.70
1.14
1.14
0.00
711.80
1.18
1.18
0.00
711.90
1.21
1.21
0.00
712.00
1.25
1.25
0.00
712.10
1.29
1.29
0.00
712.20
1.32
1.32
0.00
712.30
1.35
1.35
0.00
712.40
1.39
1.39
0.00
712.50
1.42
1.42
0.00
712.60
1.45
1.45
0.00
712.70
1.48
1.48
0.00
712.80
1.51
1.51
0.00
712.90
1.54
1.54
0.00
713.00
1.57
1.57
0.00
713.10
1.60
1.60
0.00
713.20
1.62
1.62
0.00
713.30
1.65
1.65
0.00
713.40
1.68
1.68
0.00
713.50
1.70
1.70
0.00
713.60
1.73
1.73
0.00
713.70
1.76
1.76
0.00
713.80
1.78
1.78
0.00
713.90
1.81
1.81
0.00
714.00
1.83
1.83
0.00
714.10
1.86
1.86
0.00
714.20
1.88
1.88
0.00
714.30
1.90
1.90
0.00
714.40
1.93
1.93
0.00
714.50
1.95
1.95
0.00
714.60
1.97
1.97
0.00
714.70
1.99
1.99
0.00
714.80
2.02
2.02
0.00
714.90
2.04
2.04
0.00
715.00
2.06
2.06
0.00
715.10
3.00
3.00
0.00
715.20
4.69
4.69
0.00
715.30
6.87
6.87
0.00
715.40
9.45
9.45
0.00
715.50
12.38
12.38
0.00
715.60
14.70
14.70
0.00
715.70
16.54
16.54
0.00
715.80
18.15
18.15
0.00
715.90
19.61
19.61
0.00
716.00
20.94
20.94
0.00
716.10
22.19
22.19
0.00
716.20
23.36
23.36
0.00
716.30
24.47
24.47
0.00
716.40
25.53
25.53
0.00
716.50
26.55
26.55
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
716.60
27.52
27.52
0.00
716.70
28.46
28.46
0.00
716.80
29.37
29.37
0.00
716.90
30.24
30.24
0.00
717.00
31.10
31.10
0.00
717.10
31.92
31.92
0.00
717.20
32.73
32.73
0.00
717.30
33.51
33.51
0.00
717.40
34.28
34.28
0.00
717.50
35.03
35.03
0.00
717.60
35.76
35.76
0.00
717.70
36.48
36.48
0.00
717.80
37.18
37.18
0.00
717.90
37.87
37.87
0.00
718.00
38.55
38.55
0.00
718.10
40.87
40.87
0.00
718.20
42.27
42.27
0.00
718.30
42.54
42.54
0.00
718.40
42.81
42.81
0.00
718.50
43.08
43.08
0.00
718.60
44.13
43.34
0.79
718.70
45.83
43.61
2.23
718.80
48.02
43.87
4.15
718.90
50.60
44.13
6.48
719.00
53.68
44.39
9.30
719.10
57.19
44.64
12.55
719.20
60.68
44.90
15.78
719.30
64.40
45.15
19.25
719.40
68.33
45.41
22.92
719.50
72.46
45.66
26.80
719.60
76.88
45.91
30.98
719.70
81.52
46.16
35.36
719.80
86.13
46.40
39.72
719.90
90.88
46.65
44.23
720.00
95.67
46.89
48.78

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 28
Stage -Area -Storage for Pond 2P: POND 2
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
710.00
20,568
0
710.10
20,742
2,066
710.20
20,916
4,148
710.30
21,091
6,249
710.40
21,265
8,367
710.50
21,439
10,502
710.60
21,613
12,654
710.70
21,787
14,824
710.80
21,962
17,012
710.90
22,136
19,217
711.00
22,310
21,439
711.10
22,490
23,679
711.20
22,671
25,937
711.30
22,851
28,213
711.40
23,031
30,507
711.50
23,212
32,819
711.60
23,392
35,150
711.70
23,572
37,498
711.80
23,752
39,864
711.90
23,933
42,248
712.00
24,113
44,651
712.10
24,299
47,071
712.20
24,485
49,510
712.30
24,672
51,968
712.40
24,858
54,445
712.50
25,044
56,940
712.60
25,230
59,453
712.70
25,416
61,986
712.80
25,603
64,537
712.90
25,789
67,106
713.00
25,975
69,695
713.10
26,167
72,302
713.20
26,359
74,928
713.30
26,552
77,573
713.40
26,744
80,238
713.50
26,936
82,922
713.60
27,128
85,625
713.70
27,320
88,348
713.80
27,513
91,090
713.90
27,705
93,850
714.00
27,897
96,631
714.10
28,095
99,430
714.20
28,293
102,250
714.30
28,492
105,089
714.40
28,690
107,948
714.50
28,888
110,827
714.60
29,086
113,725
714.70
29,284
116,644
714.80
29,483
119,582
714.90
29,681
122,541
715.00
29,879
125,519
715.10
30,083
128,517
715.20
30,287
131,535
715.30
30,491
134,574
715.40
30,695
137,633
715.50
30,900
140,713
715.60
31,104
143,813
715.70
31,308
146,934
715.80
31,512
150,075
715.90
31,716
153,236
716.00
31,920
156,418
716.10
32,130
159,621
716.20
32,340
162,844
716.30
32,550
166,089
716.40
32,760
169,354
716.50
32.971
172.641
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
716.60
33,181
175,948
716.70
33,391
179,277
716.80
33,601
182,626
716.90
33,811
185,997
717.00
34,021
189,389
717.10
34,237
192,801
717.20
34,453
196,236
717.30
34,670
199,692
717.40
34,886
203,170
717.50
35,102
206,669
717.60
35,318
210,190
717.70
35,534
213,733
717.80
35,751
217,297
717.90
35,967
220,883
718.00
36,183
224,491
718.10
36,405
228,120
718.20
36,627
231,772
718.30
36,849
235,445
718.40
37,071
239,141
718.50
37,294
242,860
718.60
37,516
246,600
718.70
37,738
250,363
718.80
37,960
254,148
718.90
38,182
257,955
719.00
38,404
261,784
719.10
38,632
265,636
719.20
38,860
269,510
719.30
39,089
273,408
719.40
39,317
277,328
719.50
39,545
281,271
719.60
39,773
285,237
719.70
40,001
289,226
719.80
40,230
293,237
719.90
40,458
297,272
720.00
40,686
301,329

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 29
Summary for Pond 8P: POND 3
Inflow Area = 15.260 ac, 72.15% Impervious, Inflow Depth = 2.17" for 2yr-24hr event
Inflow = 58.17 cfs @ 11.95 hrs, Volume= 2.758 of
Outflow = 1.87 cfs @ 13.87 hrs, Volume= 2.721 af, Atten= 97%, Lag= 115.0 min
Primary = 1.87 cfs @ 13.87 hrs, Volume= 2.721 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 703.58' @ 13.87 hrs Surf.Area= 50,998 sf Storage= 74,706 cf
Plug -Flow detention time= 640.2 min calculated for 2.721 of (99% of inflow)
Center -of -Mass det. time= 632.1 min ( 1,440.8 - 808.7 )
Volume Invert
Avail.Storage Storage Description
#1 702.00'
503,002 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
702.00
43,792
0 0
703.00
48,320
46,056 46,056
704.00
52,961
50,641 96,697
705.00
57,717
55,339 152,036
706.00
62,582
60,150 212,185
707.00
67,552
65,067 277,252
708.00
72,628
70,090 347,342
709.00
77,809
75,219 422,561
710.00
83,074
80,442 503,002
Device Routing
Invert
Outlet Devices
#1 Primary
701.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 701.39' / 701.00' S= 0.0050 T Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
702.00'
8.0" Vert. 8" Orifice C= 0.600
#3 Device 1
705.00'
36.0" W x 6.0" H Vert. Orifice/Grate X 2.00 C= 0.600
#4 Device 1
708.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
708.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=1.87 cfs @ 13.87 hrs HW=703.58' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 1.87 cfs of 14.64 cfs potential flow)
2=8" Orifice (Orifice Controls 1.87 cfs @ 5.37 fps)
3=Orifice/Grate ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=702.00' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 30
'1.71 E:iA1O]isDS]
Hydrograph
r - -I - - r - -I - - ? - -I- - Y - -
58.17 CfS
--I---I
-----II
---------------I--I_
- - _
■Inflow
■Outflow
65
+--+----+----+----+----+-r�11VYY
+
/`11 GQ� 16 L�V �W
■ Primary
■ Secondary
60
-7-
7--T----T----T----7--II
-7--IF--1
T -TI-
-P�ekl EIeW--=7-
�3.6`
55
-�-
- -
J--L--1--1--1--1--I--1--I--�--L-1--L}
--
Ir--III--
I*--III--7--III--
--III--
--IIr-,-
-'L--1p--L�J-�-�1--1n--1-^1;�-
4Qrivge=�-`�`7�� -�#--
50
I
I
I
I I
I I I I I
I
I I I I I I I I I I I
40
w
u 35
- -
7--r----T----T--Ir-7--Ii-7--Ir--7--I-
--r----r----T----7--
3 30
0
LL
25
20
- -
-I--
II --I--
--I--
--I-- --II -
--II
- --II --I-- II --I-- II --I-- --I-- --
15
-�-
1--L--1--1--I--1--I--1--I--�--L-1--L-J--L--1--L--1--1--1--1-
10
1.87 cfs
0.00 Cfs
0
0
5 10 15 20 25 30
35
40 45
50 55 60 65 70
75
80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 8P: POND 3
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
702.00
0.00
0.00
0.00
2.50
0.00
0
702.00
0.00
0.00
0.00
5.00
0.00
0
702.00
0.00
0.00
0.00
7.50
0.13
323
702.01
0.00
0.00
0.00
10.00
0.71
3,521
702.08
0.02
0.02
0.00
12.50
4.65
70,142
703.49
1.81
1.81
0.00
15.00
1.41
73,584
703.55
1.86
1.86
0.00
17.50
0.91
67,115
703.43
1.76
1.76
0.00
20.00
0.62
58,769
703.26
1.62
1.62
0.00
22.50
0.56
50,190
703.09
1.46
1.46
0.00
25.00
0.00
40,922
702.89
1.26
1.26
0.00
27.50
0.00
30,808
702.68
0.99
0.99
0.00
30.00
0.00
23,134
702.51
0.71
0.71
0.00
32.50
0.00
17,906
702.40
0.47
0.47
0.00
35.00
0.00
14,376
702.32
0.32
0.32
0.00
37.50
0.00
11,906
702.27
0.23
0.23
0.00
40.00
0.00
10,110
702.23
0.17
0.17
0.00
42.50
0.00
8,756
702.20
0.13
0.13
0.00
45.00
0.00
7,706
702.17
0.10
0.10
0.00
47.50
0.00
6,871
702.16
0.08
0.08
0.00
50.00
0.00
6,193
702.14
0.07
0.07
0.00
52.50
0.00
5,632
702.13
0.06
0.06
0.00
55.00
0.00
5,161
702.12
0.05
0.05
0.00
57.50
0.00
4,761
702.11
0.04
0.04
0.00
60.00
0.00
4,416
702.10
0.04
0.04
0.00
62.50
0.00
4,117
702.09
0.03
0.03
0.00
65.00
0.00
3,855
702.09
0.03
0.03
0.00
67.50
0.00
3,624
702.08
0.02
0.02
0.00
70.00
0.00
3,418
702.08
0.02
0.02
0.00
72.50
0.00
3,234
702.07
0.02
0.02
0.00
75.00
0.00
3,068
702.07
0.02
0.02
0.00
77.50
0.00
2,918
702.07
0.02
0.02
0.00
80.00
0.00
2,782
702.06
0.01
0.01
0.00
82.50
0.00
2,658
702.06
0.01
0.01
0.00
85.00
0.00
2,544
702.06
0.01
0.01
0.00
87.50
0.00
2,440
702.06
0.01
0.01
0.00
90.00
0.00
2,343
702.05
0.01
0.01
0.00
92.50
0.00
2,254
702.05
0.01
0.01
0.00
95.00
0.00
2,171
702.05
0.01
0.01
0.00
97.50
0.00
2,094
702.05
0.01
0.01
0.00
100.00
0.00
2,023
702.05
0.01
0.01
0.00
102.50
0.00
1,955
702.04
0.01
0.01
0.00
105.00
0.00
1,893
702.04
0.01
0.01
0.00
107.50
0.00
1,834
702.04
0.01
0.01
0.00
110.00
0.00
1,778
702.04
0.01
0.01
0.00
112.50
0.00
1,726
702.04
0.01
0.01
0.00
115.00
0.00
1,677
702.04
0.01
0.01
0.00
117.50
0.00
1,630
702.04
0.01
0.01
0.00
120.00
0.00
1,586
702.04
0.00
0.00
0.00
Type 1124-hr 2yr-24hr Rainfall=3.39"
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 32
Stage -Discharge for Pond 8P: POND 3
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
702.00
0.00
0.00
0.00
702.10
0.04
0.04
0.00
702.20
0.13
0.13
0.00
702.30
0.28
0.28
0.00
702.40
0.47
0.47
0.00
702.50
0.68
0.68
0.00
702.60
0.87
0.87
0.00
702.70
1.02
1.02
0.00
702.80
1.15
1.15
0.00
702.90
1.27
1.27
0.00
703.00
1.37
1.37
0.00
703.10
1.47
1.47
0.00
703.20
1.56
1.56
0.00
703.30
1.65
1.65
0.00
703.40
1.74
1.74
0.00
703.50
1.82
1.82
0.00
703.60
1.89
1.89
0.00
703.70
1.96
1.96
0.00
703.80
2.04
2.04
0.00
703.90
2.10
2.10
0.00
704.00
2.17
2.17
0.00
704.10
2.23
2.23
0.00
704.20
2.30
2.30
0.00
704.30
2.36
2.36
0.00
704.40
2.42
2.42
0.00
704.50
2.47
2.47
0.00
704.60
2.53
2.53
0.00
704.70
2.59
2.59
0.00
704.80
2.64
2.64
0.00
704.90
2.69
2.69
0.00
705.00
2.74
2.74
0.00
705.10
3.40
3.40
0.00
705.20
4.57
4.57
0.00
705.30
6.06
6.06
0.00
705.40
7.82
7.82
0.00
705.50
9.80
9.80
0.00
705.60
11.38
11.38
0.00
705.70
12.64
12.64
0.00
705.80
13.75
13.75
0.00
705.90
14.75
14.75
0.00
706.00
15.67
15.67
0.00
706.10
16.53
16.53
0.00
706.20
17.34
17.34
0.00
706.30
18.11
18.11
0.00
706.40
18.85
18.85
0.00
706.50
19.55
19.55
0.00
706.60
20.23
20.23
0.00
706.70
20.88
20.88
0.00
706.80
21.52
21.52
0.00
706.90
22.13
22.13
0.00
707.00
22.72
22.72
0.00
707.10
23.30
23.30
0.00
707.20
23.87
23.87
0.00
707.30
24.41
24.41
0.00
707.40
24.95
24.95
0.00
707.50
25.48
25.48
0.00
707.60
25.99
25.99
0.00
707.70
26.49
26.49
0.00
707.80
26.99
26.99
0.00
707.90
27.47
27.47
0.00
708.00
27.95
27.95
0.00
708.10
30.07
30.07
0.00
708.20
33.55
33.55
0.00
708.30
36.77
36.77
0.00
708.40
37.08
37.08
0.00
708.50
37.39
37.39
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
708.60
38.48
37.70
0.79
708.70
40.22
38.00
2.23
708.80
42.45
38.30
4.15
708.90
45.07
38.60
6.48
709.00
48.19
38.89
9.30
709.10
51.73
39.18
12.55
709.20
55.26
39.47
15.78
709.30
59.01
39.76
19.25
709.40
62.97
40.05
22.92
709.50
67.13
40.33
26.80
709.60
71.59
40.62
30.98
709.70
76.26
40.90
35.36
709.80
80.90
41.18
39.72
709.90
85.68
41.45
44.23
710.00
90.50
41.73
48.78

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 33
Stage -Area -Storage for Pond 8P: POND 3
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
702.00
43,792
0
702.10
44,245
4,402
702.20
44,698
8,849
702.30
45,150
13,341
702.40
45,603
17,879
702.50
46,056
22,462
702.60
46,509
27,090
702.70
46,962
31,764
702.80
47,414
36,483
702.90
47,867
41,247
703.00
48,320
46,056
703.10
48,784
50,911
703.20
49,248
55,813
703.30
49,712
60,761
703.40
50,176
65,755
703.50
50,641
70,796
703.60
51,105
75,883
703.70
51,569
81,017
703.80
52,033
86,197
703.90
52,497
91,424
704.00
52,961
96,697
704.10
53,437
102,016
704.20
53,912
107,384
704.30
54,388
112,799
704.40
54,863
118,261
704.50
55,339
123,772
704.60
55,815
129,329
704.70
56,290
134,934
704.80
56,766
140,587
704.90
57,241
146,288
705.00
57,717
152,036
705.10
58,204
157,832
705.20
58,690
163,676
705.30
59,176
169,570
705.40
59,663
175,511
705.50
60,150
181,502
705.60
60,636
187,541
705.70
61,123
193,629
705.80
61,609
199,766
705.90
62,095
205,951
706.00
62,582
212,185
706.10
63,079
218,468
706.20
63,576
224,801
706.30
64,073
231,183
706.40
64,570
237,615
706.50
65,067
244,097
706.60
65,564
250,629
706.70
66,061
257,210
706.80
66,558
263,841
706.90
67,055
270,522
707.00
67,552
277,252
707.10
68,060
284,033
707.20
68,567
290,864
707.30
69,075
297,746
707.40
69,582
304,679
707.50
70,090
311,663
707.60
70,598
318,697
707.70
71,105
325,782
707.80
71,613
332,918
707.90
72,120
340,105
708.00
72,628
347,342
708.10
73,146
354,631
708.20
73,664
361,971
708.30
74,182
369,364
708.40
74,700
376,808
708.50
75.219
384.304
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
708.60
75,737
391,851
708.70
76,255
399,451
708.80
76,773
407,102
708.90
77,291
414,806
709.00
77,809
422,561
709.10
78,336
430,368
709.20
78,862
438,228
709.30
79,388
446,140
709.40
79,915
454,105
709.50
80,442
462,123
709.60
80,968
470,194
709.70
81,495
478,317
709.80
82,021
486,492
709.90
82,547
494,721
710.00
83,074
503,002

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 34
Summary for Pond 10P: POND 4
Inflow Area = 10.550 ac, 69.48% Impervious, Inflow Depth = 2.08" for 2yr-24hr event
Inflow = 38.86 cfs @ 11.96 hrs, Volume= 1.832 of
Outflow = 3.30 cfs @ 12.48 hrs, Volume= 1.832 af, Atten= 92%, Lag= 31.3 min
Primary = 3.30 cfs @ 12.48 hrs, Volume= 1.832 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 681.19' @ 12.48 hrs Surf.Area= 14,763 sf Storage= 36,402 cf
Plug -Flow detention time= 122.0 min calculated for 1.831 of (100% of inflow)
Center -of -Mass det. time= 123.1 min ( 935.6 - 812.5 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
120,639 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
4,560
0 0
678.00
5,909
5,235 5,235
679.00
7,780
6,845 12,079
680.00
10,667
9,224 21,303
681.00
14,076
12,372 33,674
682.00
17,710
15,893 49,567
683.00
21,571
19,641 69,208
684.00
25,659
23,615 92,823
685.00
29,973
27,816 120,639
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 T Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
677.00'
8.0" Vert. 8" Orifice C= 0.600
#3 Device 1
682.50'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#4 Secondary
683.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=3.30 cfs @ 12.48 hrs HW=681.19' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 3.30 cfs of 29.48 cfs potential flow)
1 2=8" Orifice (Orifice Controls 3.30 cfs @ 9.45 fps)
3=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
4=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 35
'0 i gM111]A191MIZ!
Hydrograph
i
-r--r-r--r----t--I--t--I--r--I--r--r-r--r-r--r--I--r--I--t--I--r--
38.86 CfS
I ----?----
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111--
1--11--
1--11---11-----11-----11---I --II---II--
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1 A 1v
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V
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imary
42
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30
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28
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12
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--L--1--1--1--L--1--L--1--L--L-L--L-J--L--1--L--1--L--1--L--
6
0.00
cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 10P: POND 4
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.00
0
677.00
0.00
0.00
0.00
7.50
0.06
106
677.02
0.00
0.00
0.00
10.00
0.43
1,296
677.27
0.24
0.24
0.00
12.50
3.14
36,395
681.19
3.30
3.30
0.00
15.00
0.95
22,217
680.08
2.79
2.79
0.00
17.50
0.62
8,024
678.44
1.77
1.77
0.00
20.00
0.42
2,294
677.47
0.61
0.61
0.00
22.50
0.38
1,736
677.36
0.40
0.40
0.00
25.00
0.00
924
677.20
0.13
0.13
0.00
27.50
0.00
394
677.09
0.03
0.03
0.00
30.00
0.00
246
677.05
0.01
0.01
0.00
32.50
0.00
178
677.04
0.01
0.01
0.00
35.00
0.00
139
677.03
0.00
0.00
0.00
37.50
0.00
114
677.02
0.00
0.00
0.00
40.00
0.00
97
677.02
0.00
0.00
0.00
42.50
0.00
84
677.02
0.00
0.00
0.00
45.00
0.00
74
677.02
0.00
0.00
0.00
47.50
0.00
66
677.01
0.00
0.00
0.00
50.00
0.00
60
677.01
0.00
0.00
0.00
52.50
0.00
55
677.01
0.00
0.00
0.00
55.00
0.00
50
677.01
0.00
0.00
0.00
57.50
0.00
47
677.01
0.00
0.00
0.00
60.00
0.00
43
677.01
0.00
0.00
0.00
62.50
0.00
41
677.01
0.00
0.00
0.00
65.00
0.00
38
677.01
0.00
0.00
0.00
67.50
0.00
36
677.01
0.00
0.00
0.00
70.00
0.00
34
677.01
0.00
0.00
0.00
72.50
0.00
32
677.01
0.00
0.00
0.00
75.00
0.00
31
677.01
0.00
0.00
0.00
77.50
0.00
29
677.01
0.00
0.00
0.00
80.00
0.00
28
677.01
0.00
0.00
0.00
82.50
0.00
27
677.01
0.00
0.00
0.00
85.00
0.00
26
677.01
0.00
0.00
0.00
87.50
0.00
25
677.01
0.00
0.00
0.00
90.00
0.00
24
677.01
0.00
0.00
0.00
92.50
0.00
23
677.01
0.00
0.00
0.00
95.00
0.00
22
677.00
0.00
0.00
0.00
97.50
0.00
21
677.00
0.00
0.00
0.00
100.00
0.00
21
677.00
0.00
0.00
0.00
102.50
0.00
20
677.00
0.00
0.00
0.00
105.00
0.00
19
677.00
0.00
0.00
0.00
107.50
0.00
19
677.00
0.00
0.00
0.00
110.00
0.00
18
677.00
0.00
0.00
0.00
112.50
0.00
18
677.00
0.00
0.00
0.00
115.00
0.00
17
677.00
0.00
0.00
0.00
117.50
0.00
17
677.00
0.00
0.00
0.00
120.00
0.00
16
677.00
0.00
0.00
0.00
Type 1124-hr 2yr-24hr Rainfall=3.39"
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 37
Stage -Discharge for Pond 10P: POND 4
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.13
0.13
0.00
677.30
0.28
0.28
0.00
677.40
0.47
0.47
0.00
677.50
0.68
0.68
0.00
677.60
0.87
0.87
0.00
677.70
1.02
1.02
0.00
677.80
1.15
1.15
0.00
677.90
1.27
1.27
0.00
678.00
1.37
1.37
0.00
678.10
1.47
1.47
0.00
678.20
1.56
1.56
0.00
678.30
1.65
1.65
0.00
678.40
1.74
1.74
0.00
678.50
1.82
1.82
0.00
678.60
1.89
1.89
0.00
678.70
1.96
1.96
0.00
678.80
2.04
2.04
0.00
678.90
2.10
2.10
0.00
679.00
2.17
2.17
0.00
679.10
2.23
2.23
0.00
679.20
2.30
2.30
0.00
679.30
2.36
2.36
0.00
679.40
2.42
2.42
0.00
679.50
2.47
2.47
0.00
679.60
2.53
2.53
0.00
679.70
2.59
2.59
0.00
679.80
2.64
2.64
0.00
679.90
2.69
2.69
0.00
680.00
2.74
2.74
0.00
680.10
2.80
2.80
0.00
680.20
2.85
2.85
0.00
680.30
2.89
2.89
0.00
680.40
2.94
2.94
0.00
680.50
2.99
2.99
0.00
680.60
3.04
3.04
0.00
680.70
3.08
3.08
0.00
680.80
3.13
3.13
0.00
680.90
3.17
3.17
0.00
681.00
3.22
3.22
0.00
681.10
3.26
3.26
0.00
681.20
3.30
3.30
0.00
681.30
3.35
3.35
0.00
681.40
3.39
3.39
0.00
681.50
3.43
3.43
0.00
681.60
3.47
3.47
0.00
681.70
3.51
3.51
0.00
681.80
3.55
3.55
0.00
681.90
3.59
3.59
0.00
682.00
3.63
3.63
0.00
682.10
3.67
3.67
0.00
682.20
3.71
3.71
0.00
682.30
3.75
3.75
0.00
682.40
3.78
3.78
0.00
682.50
3.82
3.82
0.00
682.60
5.51
5.51
0.00
682.70
8.57
8.57
0.00
682.80
12.53
12.53
0.00
682.90
17.20
17.20
0.00
683.00
22.50
22.50
0.00
683.10
28.35
28.35
0.00
683.20
34.71
34.71
0.00
683.30
36.77
36.77
0.00
683.40
37.08
37.08
0.00
683.50
37.39
37.39
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
38.48
37.70
0.79
683.70
40.22
38.00
2.23
683.80
42.45
38.30
4.15
683.90
45.07
38.60
6.48
684.00
48.19
38.89
9.30
684.10
51.73
39.18
12.55
684.20
55.26
39.47
15.78
684.30
59.01
39.76
19.25
684.40
62.97
40.05
22.92
684.50
67.13
40.33
26.80
684.60
71.59
40.62
30.98
684.70
76.26
40.90
35.36
684.80
80.90
41.18
39.72
684.90
85.68
41.45
44.23
685.00
90.50
41.73
48.78

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 38
Stage -Area -Storage for Pond 10P: POND 4
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
4,560
0
677.10
4,695
463
677.20
4,830
939
677.30
4,965
1,429
677.40
5,100
1,932
677.50
5,235
2,449
677.60
5,369
2,979
677.70
5,504
3,523
677.80
5,639
4,080
677.90
5,774
4,650
678.00
5,909
5,235
678.10
6,096
5,835
678.20
6,283
6,454
678.30
6,470
7,091
678.40
6,657
7,748
678.50
6,845
8,423
678.60
7,032
9,117
678.70
7,219
9,829
678.80
7,406
10,560
678.90
7,593
11,310
679.00
7,780
12,079
679.10
8,069
12,871
679.20
8,357
13,693
679.30
8,646
14,543
679.40
8,935
15,422
679.50
9,224
16,330
679.60
9,512
17,267
679.70
9,801
18,232
679.80
10,090
19,227
679.90
10,378
20,250
680.00
10,667
21,303
680.10
11,008
22,386
680.20
11,349
23,504
680.30
11,690
24,656
680.40
12,031
25,842
680.50
12,372
27,062
680.60
12,712
28,316
680.70
13,053
29,605
680.80
13,394
30,927
680.90
13,735
32,283
681.00
14,076
33,674
681.10
14,439
35,100
681.20
14,803
36,562
681.30
15,166
38,060
681.40
15,530
39,595
681.50
15,893
41,166
681.60
16,256
42,774
681.70
16,620
44,418
681.80
16,983
46,098
681.90
17,347
47,814
682.00
17,710
49,567
682.10
18,096
51,357
682.20
18,482
53,186
682.30
18,868
55,054
682.40
19,254
56,960
682.50
19,641
58,905
682.60
20,027
60,888
682.70
20,413
62,910
682.80
20,799
64,971
682.90
21,185
67,070
683.00
21,571
69,208
683.10
21,980
71,385
683.20
22,389
73,603
683.30
22,797
75,863
683.40
23,206
78,163
683.50
23.615
80.504
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
24,024
82,886
683.70
24,433
85,309
683.80
24,841
87,772
683.90
25,250
90,277
684.00
25,659
92,823
684.10
26,090
95,410
684.20
26,522
98,041
684.30
26,953
100,714
684.40
27,385
103,431
684.50
27,816
106,191
684.60
28,247
108,994
684.70
28,679
111,841
684.80
29,110
114,730
684.90
29,542
117,663
685.00
29,973
120,639

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 39
Summary for Pond 11 P: POST - OUTFALL #2
Inflow Area = 67.620 ac, 58.77% Impervious, Inflow Depth > 1.83" for 2yr-24hr event
Inflow = 13.80 cfs @ 12.54 hrs, Volume= 10.338 of
Primary = 13.80 cfs @ 12.54 hrs, Volume= 10.338 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 11 P: POST - OUTFALL #2
Hydrograph
��I
----r--r--r--r--I--r--r--r--I--r--r--r--r-r--r--r--I---I--r--r--r--I--
❑ Inflow
15
L--'---'----i--'---'----i--r--'--r--i--�--'-------L--r--'--
I I I I I I I I I I I I I I I
❑Primary
13.80
cfs I --,-----�-- --------- -- -10oW re -
-�d=07r620
14
I I I I I I I I I I I I�q
13
12
-'--------'-- -'--------------------- -'-- -'--------'-- -'----- ---'--
--r--r--I--r--r--r--I--r--r--r--r-r--r--r--I---I--r--r--r--I--
10-
9
y
-
----T---------T--II ------T--T----T--T--T------T--T--Ir--II--
U
— 8
__ _L--I---I--1--1--I---I--J--1--L--I--J--1--L--I---I--1--L--L--I--
LL
6
5
li--
4
-- - ---- --T--T----T--T--T----T--T--T--Ir--li--T--T--T--
3
1
0
0 5
10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 40
Hydrograph for Pond 11 P: POST - OUTFALL #2
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.00
0.00
7.00
0.01
0.01
8.00
0.05
0.05
9.00
0.22
0.22
10.00
0.62
0.62
11.00
1.37
1.37
12.00
7.15
7.15
13.00
12.49
12.49
14.00
9.61
9.61
15.00
8.12
8.12
16.00
7.08
7.08
17.00
6.23
6.23
18.00
5.62
5.62
19.00
5.02
5.02
20.00
4.49
4.49
21.00
4.23
4.23
22.00
4.09
4.09
23.00
3.97
3.97
24.00
3.85
3.85
25.00
3.24
3.24
26.00
3.01
3.01
27.00
2.82
2.82
28.00
2.64
2.64
29.00
2.46
2.46
30.00
2.27
2.27
31.00
2.10
2.10
32.00
1.95
1.95
33.00
1.81
1.81
34.00
1.68
1.68
35.00
1.56
1.56
36.00
1.45
1.45
37.00
1.35
1.35
38.00
1.25
1.25
39.00
1.15
1.15
40.00
1.06
1.06
41.00
0.97
0.97
42.00
0.88
0.88
43.00
0.80
0.80
44.00
0.71
0.71
45.00
0.63
0.63
46.00
0.55
0.55
47.00
0.46
0.46
48.00
0.38
0.38
49.00
0.31
0.31
50.00
0.26
0.26
51.00
0.22
0.22
52.00
0.19
0.19
53.00
0.16
0.16
54.00
0.14
0.14
55.00
0.13
0.13
56.00
0.11
0.11
57.00
0.10
0.10
58.00
0.09
0.09
59.00
0.08
0.08
60.00
0.08
0.08
61.00
0.07
0.07
62.00
0.06
0.06
63.00
0.06
0.06
64.00
0.06
0.06
65.00
0.05
0.05
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.05
0.05
67.00
0.05
0.05
68.00
0.04
0.04
69.00
0.04
0.04
70.00
0.04
0.04
71.00
0.04
0.04
72.00
0.03
0.03
73.00
0.03
0.03
74.00
0.03
0.03
75.00
0.03
0.03
76.00
0.03
0.03
77.00
0.03
0.03
78.00
0.03
0.03
79.00
0.02
0.02
80.00
0.02
0.02
81.00
0.02
0.02
82.00
0.02
0.02
83.00
0.02
0.02
84.00
0.02
0.02
85.00
0.02
0.02
86.00
0.02
0.02
87.00
0.02
0.02
88.00
0.02
0.02
89.00
0.02
0.02
90.00
0.02
0.02
91.00
0.01
0.01
92.00
0.01
0.01
93.00
0.01
0.01
94.00
0.01
0.01
95.00
0.01
0.01
96.00
0.01
0.01
97.00
0.01
0.01
98.00
0.01
0.01
99.00
0.01
0.01
100.00
0.01
0.01
101.00
0.01
0.01
102.00
0.01
0.01
103.00
0.01
0.01
104.00
0.01
0.01
105.00
0.01
0.01
106.00
0.01
0.01
107.00
0.01
0.01
108.00
0.01
0.01
109.00
0.01
0.01
110.00
0.01
0.01
111.00
0.01
0.01
112.00
0.01
0.01
113.00
0.01
0.01
114.00
0.01
0.01
115.00
0.01
0.01
116.00
0.01
0.01
117.00
0.01
0.01
118.00
0.01
0.01
119.00
0.01
0.01
120.00
0.01
0.01

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 41
Summary for Pond 13P: POND 1
Inflow Area = 31.010 ac, 78.30% Impervious, Inflow Depth = 2.35" for 2yr-24hr event
Inflow = 126.02 cfs @ 11.95 hrs, Volume= 6.060 of
Outflow = 5.30 cfs @ 13.27 hrs, Volume= 6.052 af, Atten= 96%, Lag= 79.2 min
Primary = 5.30 cfs @ 13.27 hrs, Volume= 6.052 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 705.50' @ 13.27 hrs Surf.Area= 41,847 sf Storage= 151,682 cf
Plug -Flow detention time= 378.2 min calculated for 6.052 of (100% of inflow)
Center -of -Mass det. time= 377.3 min ( 1,177.9 - 800.7 )
Volume
Invert Avail.Storage Storage Description
#1
701.00'
393,227 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.00
22,606
0
0
702.00
30,532
26,569
26,569
703.00
33,334
31,933
58,502
704.00
36,378
34,856
93,358
705.00
39,732
38,055
131,413
706.00
43,988
41,860
173,273
707.00
49,187
46,588
219,861
708.00
54,818
52,003
271,863
709.00
60,624
57,721
329,584
710.00
66,662
63,643
393,227
Device Routing Invert Outlet Devices
#1 Primary 700.39' 36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 700.39' / 700.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1 701.00' 10.0" Vert. 8" Orifice C= 0.600
#3 Device 1 706.00' 36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=5.30 cfs @ 13.27 hrs HW=705.50' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 5.30 cfs of 63.62 cfs potential flow)
2=8" Orifice (Orifice Controls 5.30 cfs @ 9.73 fps)
3=Orifice/Grate ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=701.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 42
'0=6 1 gM10 14i
Hydrograph
126.02 CfS
- -----'--'---'--'----------------------------'--
IN Inflow
IN Outflow
- -
--r-
--r- --r- --r- --r
r r
1 nflow Are ea=` 1r0 0 acv
IN Primary
140
130
- -
--,-
J--L-J--L-
-,--,I
-- -J--L-----J--L-J--L--'--
--,--,I- -, --,I--,--,I--,--,I __�__,-Lorai��,cIF-
'�
-J--L---L-J--
Be_ V=,����y705..50''
■Secondary
120
c7�Pe'al�_
e �5-F
110
-1---r---r---r---r-1------r---r----r---r-1--r-�--
90
w 80--�--
u
- -
--
- -- - --r- -- - --i-
-- - ----i--r- -- - --r- --
0 60
50
40
20
5.30 cfs -
0.00
Cfs
0
0 5 10 15 20 25 30
35 40 45 50 55 60 65 70 75
80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 13P: POND 1
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.00
0.00
0.00
0.00
2.50
0.00
0
701.00
0.00
0.00
0.00
5.00
0.00
0
701.00
0.00
0.00
0.00
7.50
0.47
1,788
701.08
0.02
0.02
0.00
10.00
1.83
9,228
701.38
0.51
0.51
0.00
12.50
9.87
147,235
705.39
5.23
5.23
0.00
15.00
2.96
142,524
705.28
5.16
5.16
0.00
17.50
1.90
118,548
704.67
4.74
4.74
0.00
20.00
1.30
92,617
703.98
4.20
4.20
0.00
22.50
1.16
68,487
703.30
3.60
3.60
0.00
25.00
0.00
45,457
702.60
2.86
2.86
0.00
27.50
0.00
24,156
701.92
1.86
1.86
0.00
30.00
0.00
12,245
701.50
0.82
0.82
0.00
32.50
0.00
7,372
701.31
0.35
0.35
0.00
35.00
0.00
5,107
701.22
0.18
0.18
0.00
37.50
0.00
3,856
701.17
0.11
0.11
0.00
40.00
0.00
3,079
701.13
0.07
0.07
0.00
42.50
0.00
2,553
701.11
0.05
0.05
0.00
45.00
0.00
2,177
701.09
0.04
0.04
0.00
47.50
0.00
1,894
701.08
0.03
0.03
0.00
50.00
0.00
1,675
701.07
0.02
0.02
0.00
52.50
0.00
1,501
701.07
0.02
0.02
0.00
55.00
0.00
1,358
701.06
0.01
0.01
0.00
57.50
0.00
1,240
701.05
0.01
0.01
0.00
60.00
0.00
1,141
701.05
0.01
0.01
0.00
62.50
0.00
1,056
701.05
0.01
0.01
0.00
65.00
0.00
983
701.04
0.01
0.01
0.00
67.50
0.00
919
701.04
0.01
0.01
0.00
70.00
0.00
862
701.04
0.01
0.01
0.00
72.50
0.00
813
701.04
0.01
0.01
0.00
75.00
0.00
768
701.03
0.00
0.00
0.00
77.50
0.00
728
701.03
0.00
0.00
0.00
80.00
0.00
692
701.03
0.00
0.00
0.00
82.50
0.00
660
701.03
0.00
0.00
0.00
85.00
0.00
630
701.03
0.00
0.00
0.00
87.50
0.00
603
701.03
0.00
0.00
0.00
90.00
0.00
578
701.03
0.00
0.00
0.00
92.50
0.00
555
701.02
0.00
0.00
0.00
95.00
0.00
534
701.02
0.00
0.00
0.00
97.50
0.00
514
701.02
0.00
0.00
0.00
100.00
0.00
496
701.02
0.00
0.00
0.00
102.50
0.00
479
701.02
0.00
0.00
0.00
105.00
0.00
463
701.02
0.00
0.00
0.00
107.50
0.00
448
701.02
0.00
0.00
0.00
110.00
0.00
434
701.02
0.00
0.00
0.00
112.50
0.00
421
701.02
0.00
0.00
0.00
115.00
0.00
408
701.02
0.00
0.00
0.00
117.50
0.00
397
701.02
0.00
0.00
0.00
120.00
0.00
386
701.02
0.00
0.00
0.00
Type 1124-hr 2yr-24hr Rainfall=3.39"
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 44
Stage -Discharge for Pond 13P: POND 1
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.00
0.00
0.00
0.00
701.10
0.04
0.04
0.00
701.20
0.15
0.15
0.00
701.30
0.33
0.33
0.00
701.40
0.56
0.56
0.00
701.50
0.82
0.82
0.00
701.60
1.11
1.11
0.00
701.70
1.39
1.39
0.00
701.80
1.64
1.64
0.00
701.90
1.83
1.83
0.00
702.00
2.01
2.01
0.00
702.10
2.17
2.17
0.00
702.20
2.32
2.32
0.00
702.30
2.47
2.47
0.00
702.40
2.60
2.60
0.00
702.50
2.73
2.73
0.00
702.60
2.86
2.86
0.00
702.70
2.98
2.98
0.00
702.80
3.09
3.09
0.00
702.90
3.20
3.20
0.00
703.00
3.30
3.30
0.00
703.10
3.41
3.41
0.00
703.20
3.51
3.51
0.00
703.30
3.60
3.60
0.00
703.40
3.70
3.70
0.00
703.50
3.79
3.79
0.00
703.60
3.88
3.88
0.00
703.70
3.97
3.97
0.00
703.80
4.05
4.05
0.00
703.90
4.14
4.14
0.00
704.00
4.22
4.22
0.00
704.10
4.30
4.30
0.00
704.20
4.38
4.38
0.00
704.30
4.46
4.46
0.00
704.40
4.54
4.54
0.00
704.50
4.61
4.61
0.00
704.60
4.69
4.69
0.00
704.70
4.76
4.76
0.00
704.80
4.83
4.83
0.00
704.90
4.90
4.90
0.00
705.00
4.97
4.97
0.00
705.10
5.04
5.04
0.00
705.20
5.11
5.11
0.00
705.30
5.18
5.18
0.00
705.40
5.24
5.24
0.00
705.50
5.31
5.31
0.00
705.60
5.37
5.37
0.00
705.70
5.44
5.44
0.00
705.80
5.50
5.50
0.00
705.90
5.56
5.56
0.00
706.00
5.62
5.62
0.00
706.10
6.60
6.60
0.00
706.20
8.33
8.33
0.00
706.30
10.55
10.55
0.00
706.40
13.17
13.17
0.00
706.50
16.14
16.14
0.00
706.60
19.41
19.41
0.00
706.70
22.78
22.78
0.00
706.80
25.36
25.36
0.00
706.90
27.56
27.56
0.00
707.00
29.54
29.54
0.00
707.10
31.35
31.35
0.00
707.20
33.04
33.04
0.00
707.30
34.63
34.63
0.00
707.40
36.14
36.14
0.00
707.50
37.57
37.57
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
707.60
38.95
38.95
0.00
707.70
40.27
40.27
0.00
707.80
41.55
41.55
0.00
707.90
42.78
42.78
0.00
708.00
43.97
43.97
0.00
708.10
46.79
46.79
0.00
708.20
50.94
50.94
0.00
708.30
55.95
55.95
0.00
708.40
61.66
61.66
0.00
708.50
67.97
67.97
0.00
708.60
75.60
74.81
0.79
708.70
84.36
82.14
2.23
708.80
93.62
89.47
4.15
708.90
96.59
90.11
6.48
709.00
100.05
90.75
9.30
709.10
103.94
91.39
12.55
709.20
107.80
92.02
15.78
709.30
111.90
92.65
19.25
709.40
116.20
93.27
22.92
709.50
120.69
93.89
26.80
709.60
125.48
94.50
30.98
709.70
130.48
95.12
35.36
709.80
135.45
95.72
39.72
709.90
140.55
96.33
44.23
710.00
145.70
96.93
48.78

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 45
Stage -Area -Storage for Pond 13P: POND 1
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.00
22,606
0
701.10
23,399
2,300
701.20
24,191
4,680
701.30
24,984
7,138
701.40
25,776
9,676
701.50
26,569
12,294
701.60
27,362
14,990
701.70
28,154
17,766
701.80
28,947
20,621
701.90
29,739
23,555
702.00
30,532
26,569
702.10
30,812
29,636
702.20
31,092
32,731
702.30
31,373
35,855
702.40
31,653
39,006
702.50
31,933
42,185
702.60
32,213
45,393
702.70
32,493
48,628
702.80
32,774
51,891
702.90
33,054
55,183
703.00
33,334
58,502
703.10
33,638
61,851
703.20
33,943
65,230
703.30
34,247
68,639
703.40
34,552
72,079
703.50
34,856
75,550
703.60
35,160
79,050
703.70
35,465
82,582
703.80
35,769
86,143
703.90
36,074
89,735
704.00
36,378
93,358
704.10
36,713
97,013
704.20
37,049
100,701
704.30
37,384
104,422
704.40
37,720
108,178
704.50
38,055
111,966
704.60
38,390
115,789
704.70
38,726
119,644
704.80
39,061
123,534
704.90
39,397
127,457
705.00
39,732
131,413
705.10
40,158
135,407
705.20
40,583
139,445
705.30
41,009
143,524
705.40
41,434
147,646
705.50
41,860
151,811
705.60
42,286
156,018
705.70
42,711
160,268
705.80
43,137
164,561
705.90
43,562
168,895
706.00
43,988
173,273
706.10
44,508
177,698
706.20
45,028
182,175
706.30
45,548
186,703
706.40
46,068
191,284
706.50
46,588
195,917
706.60
47,107
200,602
706.70
47,627
205,338
706.80
48,147
210,127
706.90
48,667
214,968
707.00
49,187
219,861
707.10
49,750
224,807
707.20
50,313
229,811
707.30
50,876
234,870
707.40
51,439
239,986
707.50
52.003
245.158
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
707.60
52,566
250,386
707.70
53,129
255,671
707.80
53,692
261,012
707.90
54,255
266,409
708.00
54,818
271,863
708.10
55,399
277,374
708.20
55,979
282,943
708.30
56,560
288,570
708.40
57,140
294,255
708.50
57,721
299,998
708.60
58,302
305,799
708.70
58,882
311,658
708.80
59,463
317,575
708.90
60,043
323,551
709.00
60,624
329,584
709.10
61,228
335,677
709.20
61,832
341,830
709.30
62,435
348,043
709.40
63,039
354,317
709.50
63,643
360,651
709.60
64,247
367,045
709.70
64,851
373,500
709.80
65,454
380,015
709.90
66,058
386,591
710.00
66,662
393,227

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 46
Summary for Pond 15P: POND 6
Inflow Area = 13.860 ac, 74.39% Impervious, Inflow Depth = 2.26" for 2yr-24hr event
Inflow = 54.59 cfs @ 11.95 hrs, Volume= 2.605 of
Outflow = 3.34 cfs @ 12.70 hrs, Volume= 2.593 af, Atten= 94%, Lag= 45.0 min
Primary = 3.34 cfs @ 12.70 hrs, Volume= 2.593 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 679.04' @ 12.70 hrs Surf.Area= 33,770 sf Storage= 62,282 cf
Plug -Flow detention time= 311.6 min calculated for 2.592 of (99% of inflow)
Center -of -Mass det. time= 310.9 min ( 1,115.7 - 804.8 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
270,951 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
27,493
0 0
678.00
30,495
28,994 28,994
679.00
33,652
32,074 61,068
680.00
36,914
35,283 96,351
681.00
40,232
38,573 134,924
682.00
43,608
41,920 176,844
683.00
47,039
45,324 222,167
684.00
50,528
48,784 270,951
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1
677.00'
10.0" Vert. 8" Orifice C= 0.600
#3 Device 1
680.00'
36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1
682.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
682.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=3.34 cfs @ 12.70 hrs HW=679.04' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 3.34 cfs of 29.64 cfs potential flow)
2=8" Orifice (Orifice Controls 3.34 cfs @ 6.13 fps)
3=Orifice/Grate ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 47
'0=6 1 gmMR097ki1•I:
.....
•.. ' 1
• •,
•
/%//////////////////////////////////////////////////////////////////////0
/////////////////////////////////////////////////////////////////////////

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 C 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 15P: POND 6
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.00
0
677.00
0.00
0.00
0.00
7.50
0.16
513
677.02
0.00
0.00
0.00
10.00
0.73
3,811
677.14
0.07
0.07
0.00
12.50
4.32
62,023
679.03
3.33
3.33
0.00
15.00
1.30
51,766
678.72
3.00
3.00
0.00
17.50
0.84
36,539
678.24
2.39
2.39
0.00
20.00
0.57
24,345
677.85
1.72
1.72
0.00
22.50
0.51
16,706
677.59
1.08
1.08
0.00
25.00
0.00
11,816
677.42
0.61
0.61
0.00
27.50
0.00
7,953
677.28
0.30
0.30
0.00
30.00
0.00
5,907
677.21
0.17
0.17
0.00
32.50
0.00
4,669
677.17
0.11
0.11
0.00
35.00
0.00
3,847
677.14
0.08
0.08
0.00
37.50
0.00
3,265
677.12
0.06
0.06
0.00
40.00
0.00
2,832
677.10
0.04
0.04
0.00
42.50
0.00
2,499
677.09
0.03
0.03
0.00
45.00
0.00
2,234
677.08
0.03
0.03
0.00
47.50
0.00
2,020
677.07
0.02
0.02
0.00
50.00
0.00
1,842
677.07
0.02
0.02
0.00
52.50
0.00
1,693
677.06
0.02
0.02
0.00
55.00
0.00
1,566
677.06
0.01
0.01
0.00
57.50
0.00
1,456
677.05
0.01
0.01
0.00
60.00
0.00
1,361
677.05
0.01
0.01
0.00
62.50
0.00
1,277
677.05
0.01
0.01
0.00
65.00
0.00
1,203
677.04
0.01
0.01
0.00
67.50
0.00
1,137
677.04
0.01
0.01
0.00
70.00
0.00
1,077
677.04
0.01
0.01
0.00
72.50
0.00
1,024
677.04
0.01
0.01
0.00
75.00
0.00
975
677.04
0.01
0.01
0.00
77.50
0.00
931
677.03
0.00
0.00
0.00
80.00
0.00
891
677.03
0.00
0.00
0.00
82.50
0.00
854
677.03
0.00
0.00
0.00
85.00
0.00
820
677.03
0.00
0.00
0.00
87.50
0.00
789
677.03
0.00
0.00
0.00
90.00
0.00
759
677.03
0.00
0.00
0.00
92.50
0.00
732
677.03
0.00
0.00
0.00
95.00
0.00
707
677.03
0.00
0.00
0.00
97.50
0.00
683
677.02
0.00
0.00
0.00
100.00
0.00
661
677.02
0.00
0.00
0.00
102.50
0.00
641
677.02
0.00
0.00
0.00
105.00
0.00
621
677.02
0.00
0.00
0.00
107.50
0.00
603
677.02
0.00
0.00
0.00
110.00
0.00
586
677.02
0.00
0.00
0.00
112.50
0.00
569
677.02
0.00
0.00
0.00
115.00
0.00
554
677.02
0.00
0.00
0.00
117.50
0.00
539
677.02
0.00
0.00
0.00
120.00
0.00
526
677.02
0.00
0.00
0.00
Type 1124-hr 2yr-24hr Rainfall=3.39"
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 49
Stage -Discharge for Pond 15P: POND 6
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.15
0.15
0.00
677.30
0.33
0.33
0.00
677.40
0.56
0.56
0.00
677.50
0.82
0.82
0.00
677.60
1.11
1.11
0.00
677.70
1.39
1.39
0.00
677.80
1.64
1.64
0.00
677.90
1.83
1.83
0.00
678.00
2.01
2.01
0.00
678.10
2.17
2.17
0.00
678.20
2.32
2.32
0.00
678.30
2.47
2.47
0.00
678.40
2.60
2.60
0.00
678.50
2.73
2.73
0.00
678.60
2.86
2.86
0.00
678.70
2.98
2.98
0.00
678.80
3.09
3.09
0.00
678.90
3.20
3.20
0.00
679.00
3.30
3.30
0.00
679.10
3.41
3.41
0.00
679.20
3.51
3.51
0.00
679.30
3.60
3.60
0.00
679.40
3.70
3.70
0.00
679.50
3.79
3.79
0.00
679.60
3.88
3.88
0.00
679.70
3.97
3.97
0.00
679.80
4.05
4.05
0.00
679.90
4.14
4.14
0.00
680.00
4.22
4.22
0.00
680.10
5.22
5.22
0.00
680.20
6.97
6.97
0.00
680.30
9.21
9.21
0.00
680.40
11.84
11.84
0.00
680.50
14.83
14.83
0.00
680.60
18.11
18.11
0.00
680.70
21.50
21.50
0.00
680.80
24.10
24.10
0.00
680.90
26.31
26.31
0.00
681.00
28.30
28.30
0.00
681.10
30.13
30.13
0.00
681.20
31.83
31.83
0.00
681.30
33.44
33.44
0.00
681.40
34.95
34.95
0.00
681.50
36.40
36.40
0.00
681.60
37.79
37.79
0.00
681.70
39.12
39.12
0.00
681.80
40.41
40.41
0.00
681.90
41.65
41.65
0.00
682.00
42.86
42.86
0.00
682.10
45.68
45.68
0.00
682.20
49.84
49.84
0.00
682.30
54.87
54.87
0.00
682.40
60.59
60.59
0.00
682.50
66.90
66.90
0.00
682.60
74.54
73.75
0.79
682.70
76.87
74.64
2.23
682.80
79.57
75.42
4.15
682.90
82.66
76.18
6.48
683.00
86.24
76.94
9.30
683.10
90.23
77.69
12.55
683.20
94.21
78.43
15.78
683.30
98.41
79.16
19.25
683.40
102.82
79.89
22.92
683.50
107.41
80.61
26.80
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
112.31
81.33
30.98
683.70
117.40
82.04
35.36
683.80
122.46
82.74
39.72
683.90
127.67
83.44
44.23
684.00
132.90
84.13
48.78

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 50
Stage -Area -Storage for Pond 15P: POND 6
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
27,493
0
677.10
27,793
2,764
677.20
28,093
5,559
677.30
28,394
8,383
677.40
28,694
11,237
677.50
28,994
14,122
677.60
29,294
17,036
677.70
29,594
19,981
677.80
29,895
22,955
677.90
30,195
25,960
678.00
30,495
28,994
678.10
30,811
32,059
678.20
31,126
35,156
678.30
31,442
38,285
678.40
31,758
41,445
678.50
32,074
44,636
678.60
32,389
47,859
678.70
32,705
51,114
678.80
33,021
54,400
678.90
33,336
57,718
679.00
33,652
61,068
679.10
33,978
64,449
679.20
34,304
67,863
679.30
34,631
71,310
679.40
34,957
74,789
679.50
35,283
78,301
679.60
35,609
81,846
679.70
35,935
85,423
679.80
36,262
89,033
679.90
36,588
92,675
680.00
36,914
96,351
680.10
37,246
100,058
680.20
37,578
103,800
680.30
37,909
107,574
680.40
38,241
111,382
680.50
38,573
115,222
680.60
38,905
119,096
680.70
39,237
123,003
680.80
39,568
126,943
680.90
39,900
130,917
681.00
40,232
134,924
681.10
40,570
138,964
681.20
40,907
143,037
681.30
41,245
147,145
681.40
41,582
151,286
681.50
41,920
155,462
681.60
42,258
159,670
681.70
42,595
163,913
681.80
42,933
168,189
681.90
43,270
172,500
682.00
43,608
176,844
682.10
43,951
181,221
682.20
44,294
185,634
682.30
44,637
190,080
682.40
44,980
194,561
682.50
45,324
199,076
682.60
45,667
203,626
682.70
46,010
208,210
682.80
46,353
212,828
682.90
46,696
217,480
683.00
47,039
222,167
683.10
47,388
226,888
683.20
47,737
231,645
683.30
48,086
236,436
683.40
48,435
241,262
683.50
48.784
246.123
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
49,132
251,018
683.70
49,481
255,949
683.80
49,830
260,915
683.90
50,179
265,915
684.00
50,528
270,951

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 51
Summary for Pond 18P: POST - OUTFALL #1
Inflow Area = 43.400 ac, 64.70% Impervious, Inflow Depth = 1.97" for 2yr-24hr event
Inflow = 27.36 cfs @ 11.97 hrs, Volume= 7.135 of
Primary = 27.36 cfs @ 11.97 hrs, Volume= 7.135 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 18P: POST - OUTFALL #1
Hydrograph
------------,-----;------,-----------------------------I--
❑Inflow
30
-r-------+--+-------+--+--r----+--+--+-------+--r--+----
❑Primary
z8
27.36
cfs --------- -------------r;,fj�1=#�Tr�la-
` 0
26
--
--
-r--r-------r--r--r----r--r--r----r--r--r-------r--r--r--I
24
- L -- L-----'-- -- L-----'-- L -- L --L --'-- L-- L -- L-----'-- L -- L --L --'--
22
--
---T------- --T-- ------T--F----T--T--T------- --T-- ----
20
I I I I I I I I I I
18
N
16
--
-+--+-------+--+-------+--+--+----+--+--+-------+--+--+----
0 14
LL
12
--
--r--r----r--r--r----r--r--r-------r--r--r--I--
-r--r--I-----r
10
--
--T--T--Ir--II--
--T---------T--T------T--T----T--T--T-----
6
'I
I
- - -- -----I-- -- -- - --+-- -----I-- -- -- -
-I- - -I- -
I I I I I I I I I I I I I I I I I I
q
I I I I I T -F T F -T I I I
2
0
0 5
10
15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 52
Hydrograph for Pond 18P: POST - OUTFALL #1
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.00
0.00
7.00
0.01
0.01
8.00
0.05
0.05
9.00
0.20
0.20
10.00
0.51
0.51
11.00
1.24
1.24
12.00
25.68
25.68
13.00
6.78
6.78
14.00
6.19
6.19
15.00
5.91
5.91
16.00
5.60
5.60
17.00
5.36
5.36
18.00
5.11
5.11
19.00
4.84
4.84
20.00
4.55
4.55
21.00
4.30
4.30
22.00
4.04
4.04
23.00
3.79
3.79
24.00
3.53
3.53
25.00
2.86
2.86
26.00
2.47
2.47
27.00
2.07
2.07
28.00
1.66
1.66
29.00
1.20
1.20
30.00
0.82
0.82
31.00
0.57
0.57
32.00
0.41
0.41
33.00
0.30
0.30
34.00
0.23
0.23
35.00
0.18
0.18
36.00
0.14
0.14
37.00
0.12
0.12
38.00
0.10
0.10
39.00
0.08
0.08
40.00
0.07
0.07
41.00
0.06
0.06
42.00
0.05
0.05
43.00
0.05
0.05
44.00
0.04
0.04
45.00
0.04
0.04
46.00
0.03
0.03
47.00
0.03
0.03
48.00
0.03
0.03
49.00
0.02
0.02
50.00
0.02
0.02
51.00
0.02
0.02
52.00
0.02
0.02
53.00
0.02
0.02
54.00
0.02
0.02
55.00
0.01
0.01
56.00
0.01
0.01
57.00
0.01
0.01
58.00
0.01
0.01
59.00
0.01
0.01
60.00
0.01
0.01
61.00
0.01
0.01
62.00
0.01
0.01
63.00
0.01
0.01
64.00
0.01
0.01
65.00
0.01
0.01
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.01
0.01
67.00
0.01
0.01
68.00
0.01
0.01
69.00
0.01
0.01
70.00
0.01
0.01
71.00
0.01
0.01
72.00
0.01
0.01
73.00
0.01
0.01
74.00
0.00
0.00
75.00
0.00
0.00
76.00
0.00
0.00
77.00
0.00
0.00
78.00
0.00
0.00
79.00
0.00
0.00
80.00
0.00
0.00
81.00
0.00
0.00
82.00
0.00
0.00
83.00
0.00
0.00
84.00
0.00
0.00
85.00
0.00
0.00
86.00
0.00
0.00
87.00
0.00
0.00
88.00
0.00
0.00
89.00
0.00
0.00
90.00
0.00
0.00
91.00
0.00
0.00
92.00
0.00
0.00
93.00
0.00
0.00
94.00
0.00
0.00
95.00
0.00
0.00
96.00
0.00
0.00
97.00
0.00
0.00
98.00
0.00
0.00
99.00
0.00
0.00
100.00
0.00
0.00
101.00
0.00
0.00
102.00
0.00
0.00
103.00
0.00
0.00
104.00
0.00
0.00
105.00
0.00
0.00
106.00
0.00
0.00
107.00
0.00
0.00
108.00
0.00
0.00
109.00
0.00
0.00
110.00
0.00
0.00
111.00
0.00
0.00
112.00
0.00
0.00
113.00
0.00
0.00
114.00
0.00
0.00
115.00
0.00
0.00
116.00
0.00
0.00
117.00
0.00
0.00
118.00
0.00
0.00
119.00
0.00
0.00
120.00
0.00
0.00

TriWest Building 2 SWM Type // 24-hr 2yr-24hr Rainfall=3.39"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 53
Summary for Pond 21 P: POST - OUTFALL #3
Inflow Area = 17.630 ac, 58.48% Impervious, Inflow Depth > 1.86" for 2yr-24hr event
Inflow = 4.37 cfs @ 12.22 hrs, Volume= 2.734 of
Primary = 4.37 cfs @ 12.22 hrs, Volume= 2.734 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
w
u
3
0
LL
Pond 21 P: POST - OUTFALL #3
Hydrograph
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)
❑ Inflow
❑ Primary

TriWest Building 2 SWM Type 1124-hr 2yr-24hr Rainfall=3.39 "
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 54
Hydrograph for Pond 21 P: POST - OUTFALL #3
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.00
0.00
7.00
0.00
0.00
8.00
0.00
0.00
9.00
0.02
0.02
10.00
0.07
0.07
11.00
0.26
0.26
12.00
3.13
3.13
13.00
3.61
3.61
14.00
3.37
3.37
15.00
3.13
3.13
16.00
2.88
2.88
17.00
2.61
2.61
18.00
2.35
2.35
19.00
2.07
2.07
20.00
1.79
1.79
21.00
1.51
1.51
22.00
1.24
1.24
23.00
1.04
1.04
24.00
0.89
0.89
25.00
0.61
0.61
26.00
0.45
0.45
27.00
0.34
0.34
28.00
0.27
0.27
29.00
0.21
0.21
30.00
0.17
0.17
31.00
0.14
0.14
32.00
0.12
0.12
33.00
0.10
0.10
34.00
0.09
0.09
35.00
0.08
0.08
36.00
0.07
0.07
37.00
0.06
0.06
38.00
0.05
0.05
39.00
0.05
0.05
40.00
0.04
0.04
41.00
0.04
0.04
42.00
0.03
0.03
43.00
0.03
0.03
44.00
0.03
0.03
45.00
0.03
0.03
46.00
0.02
0.02
47.00
0.02
0.02
48.00
0.02
0.02
49.00
0.02
0.02
50.00
0.02
0.02
51.00
0.02
0.02
52.00
0.02
0.02
53.00
0.01
0.01
54.00
0.01
0.01
55.00
0.01
0.01
56.00
0.01
0.01
57.00
0.01
0.01
58.00
0.01
0.01
59.00
0.01
0.01
60.00
0.01
0.01
61.00
0.01
0.01
62.00
0.01
0.01
63.00
0.01
0.01
64.00
0.01
0.01
65.00
0.01
0.01
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.01
0.01
67.00
0.01
0.01
68.00
0.01
0.01
69.00
0.01
0.01
70.00
0.01
0.01
71.00
0.01
0.01
72.00
0.01
0.01
73.00
0.01
0.01
74.00
0.01
0.01
75.00
0.01
0.01
76.00
0.00
0.00
77.00
0.00
0.00
78.00
0.00
0.00
79.00
0.00
0.00
80.00
0.00
0.00
81.00
0.00
0.00
82.00
0.00
0.00
83.00
0.00
0.00
84.00
0.00
0.00
85.00
0.00
0.00
86.00
0.00
0.00
87.00
0.00
0.00
88.00
0.00
0.00
89.00
0.00
0.00
90.00
0.00
0.00
91.00
0.00
0.00
92.00
0.00
0.00
93.00
0.00
0.00
94.00
0.00
0.00
95.00
0.00
0.00
96.00
0.00
0.00
97.00
0.00
0.00
98.00
0.00
0.00
99.00
0.00
0.00
100.00
0.00
0.00
101.00
0.00
0.00
102.00
0.00
0.00
103.00
0.00
0.00
104.00
0.00
0.00
105.00
0.00
0.00
106.00
0.00
0.00
107.00
0.00
0.00
108.00
0.00
0.00
109.00
0.00
0.00
110.00
0.00
0.00
111.00
0.00
0.00
112.00
0.00
0.00
113.00
0.00
0.00
114.00
0.00
0.00
115.00
0.00
0.00
116.00
0.00
0.00
117.00
0.00
0.00
118.00
0.00
0.00
119.00
0.00
0.00
120.00
0.00
0.00

OAK
E N G I N E E R I N G
HYDROCAD OUTPUT
10-YEAR, 24-HOUR STORM EVENT

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 1
Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method
Subcatchment3S: POST TO POND
Subcatchment4S: PRE (OUTFALL#1)
Subcatchment5S: PRE (OUTFALL#2)
Subcatchment6S: PRE (OUTFALL#3)
Subcatchment7S: POST TO POND
Subcatchment9S: POST TO POND
Subcatchment12S: POST TO POND 1
Subcatchment14S: POST TO POND
Subcatchment17S: UNDETAINEDPOST TO OUTFALL1
Runoff Area=27.080 ac 79.03% Impervious Runoff Depth=3.84"
Tc=5.0 min CN=90 Runoff=174.81 cfs 8.661 of
Runoff Area=43.130 ac 0.00% Impervious Runoff Depth=2.25"
Flow Length=1,162' Tc=21.9 min CN=73 Runoff=101.03 cfs 8.084 of
Runoff Area=57.860 ac 0.00% Impervious Runoff Depth=2.33"
Flow Length=1,162' Tc=21.9 min CN=74 Runoff=140.95 cfs 11.246 of
Runoff Area=14.930 ac 0.00% Impervious Runoff Depth=2.25"
Flow Length=1,162' Tc=21.9 min CN=73 Runoff=34.97 cfs 2.798 of
Runoff Area=15.260
ac 72.15% Impervious Runoff Depth=3.63"
Tc=5.0 min CN=88 Runoff=94.73 cfs 4.617 of
Runoff Area=10.550
ac 69.48% Impervious Runoff Depth=3.53"
Tc=5.0 min CN=87 Runoff=64.12 cfs 3.103 of
Runoff Area=31.010 ac 78.30% Impervious Runoff Depth=3.84"
Tc=5.0 min CN=90 Runoff=200.18 cfs 9.917 of
Runoff Area=13.860
ac 74.39% Impervious Runoff Depth=3.73"
Tc=5.0 min CN=89 Runoff=87.79 cfs 4.312 of
Runoff Area=12.390
ac 30.67% Impervious Runoff Depth=2.17"
Tc=5.0 min CN=72 Runoff=48.41 cfs 2.238 of
Subcatchment19S: UNDETAINEDPOST TO OUTFALL2 Runoff Area=14.730 ac 0.00% Impervious Runoff Depth=1.15"
Flow Length=1,162' Tc=21.9 min CN=58 Runoff=15.17 cfs 1.408 of
Subcatchment20S: UNDETAINEDPOST TO OUTFALL3 Runoff Area=3.770 ac 0.00% Impervious Runoff Depth=1.21"
Flow Length=1,162' Tc=21.9 min CN=59 Runoff=4.20 cfs 0.381 of
Pond 2P: POND 2
Peak EIev=717.10' Storage=192,675 cf Inflow=174.81 cfs 8.661 of
Primary=31.89 cfs 8.649 of Secondary=0.00 cfs 0.000 of Outflow=31.89 cfs 8.649 of
Pond 8P: POND 3
Peak EIev=704.63' Storage=131,202 cf Inflow=94.73 cfs 4.617 of
Primary=2.55 cfs 4.578 of Secondary=0.00 cfs 0.000 of Outflow=2.55 cfs 4.578 of
Pond 10P: POND 4
Peak EIev=682.67' Storage=62,288 cf Inflow=64.12 cfs 3.103 of
Primary=7.53 cfs 3.103 of Secondary=0.00 cfs 0.000 of Outflow=7.53 cfs 3.103 of
Pond 11 P: POST - OUTFALL#2
Inflow=56.40 cfs 17.737 of
Primary=56.40 cfs 17.737 of
Pond 13P: POND 1
Peak EIev=706.99' Storage=219,264 cf Inflow=200.18 cfs 9.917 of
Primary=29.31 cfs 9.908 of Secondary=0.00 cfs 0.000 of Outflow=29.31 cfs 9.908 of
Pond 15P: POND 6
Peak EIev=680.19' Storage=103,430 cf Inflow=87.79 cfs 4.312 of
Primary=6.77 cfs 4.300 of Secondary=0.00 cfs 0.000 of Outflow=6.77 cfs 4.300 of
Pond 18P: POST- OUTFALL#1
Inflow=55.99 cfs 12.146 of
Primary=55.99 cfs 12.146 of
Pond 21 P: POST - OUTFALL#3
Inflow=9.64 cfs 4.681 of
Primary=9.64 cfs 4.681 of
Total Runoff Area = 244.570 ac Runoff Volume = 56.765 of Average Runoff Depth = 2.79"
68.05% Pervious = 166.440 ac 31.95% Impervious = 78.130 ac

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 2
Summary for Subcatchment 3S: POST TO POND 2
Runoff = 174.81 cfs @ 11.95 hrs, Volume= 8.661 af, Depth= 3.84"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN
Description
21.400 98
Impervious
5.680 61
>75% Grass cover, Good, HSG B
27.080 90
Weighted Average
5.680
20.97% Pervious Area
21.400
79.03% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 3S: POST TO POND 2
Hydrograph
-----I-- r --
r -- r --
r --r
--I--
r--
--
r --
r-
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 3
Hydrograph for Subcatchment 3S: POST TO POND 2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.04
5.00
0.31
0.01
0.29
6.00
0.40
0.02
0.59
7.00
0.49
0.05
0.93
8.00
0.60
0.09
1.28
9.00
0.73
0.16
2.20
10.00
0.90
0.26
3.18
11.00
1.17
0.43
6.53
12.00
3.29
2.25
147.67
13.00
3.83
2.76
8.31
14.00
4.07
2.98
4.96
15.00
4.23
3.14
3.94
16.00
4.36
3.27
3.05
17.00
4.47
3.37
2.68
18.00
4.57
3.46
2.36
19.00
4.65
3.54
2.04
20.00
4.72
3.61
1.72
21.00
4.79
3.67
1.63
22.00
4.85
3.73
1.57
23.00
4.90
3.78
1.51
24.00
4.96
3.84
1.44
25.00
4.96
3.84
0.00
26.00
4.96
3.84
0.00
27.00
4.96
3.84
0.00
28.00
4.96
3.84
0.00
29.00
4.96
3.84
0.00
30.00
4.96
3.84
0.00
31.00
4.96
3.84
0.00
32.00
4.96
3.84
0.00
33.00
4.96
3.84
0.00
34.00
4.96
3.84
0.00
35.00
4.96
3.84
0.00
36.00
4.96
3.84
0.00
37.00
4.96
3.84
0.00
38.00
4.96
3.84
0.00
39.00
4.96
3.84
0.00
40.00
4.96
3.84
0.00
41.00
4.96
3.84
0.00
42.00
4.96
3.84
0.00
43.00
4.96
3.84
0.00
44.00
4.96
3.84
0.00
45.00
4.96
3.84
0.00
46.00
4.96
3.84
0.00
47.00
4.96
3.84
0.00
48.00
4.96
3.84
0.00
49.00
4.96
3.84
0.00
50.00
4.96
3.84
0.00
51.00
4.96
3.84
0.00
52.00
4.96
3.84
0.00
53.00
4.96
3.84
0.00
54.00
4.96
3.84
0.00
55.00
4.96
3.84
0.00
56.00
4.96
3.84
0.00
57.00
4.96
3.84
0.00
58.00
4.96
3.84
0.00
59.00
4.96
3.84
0.00
60.00
4.96
3.84
0.00
61.00
4.96
3.84
0.00
62.00
4.96
3.84
0.00
63.00
4.96
3.84
0.00
64.00
4.96
3.84
0.00
65.00
4.96
3.84
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
3.84
0.00
67.00
4.96
3.84
0.00
68.00
4.96
3.84
0.00
69.00
4.96
3.84
0.00
70.00
4.96
3.84
0.00
71.00
4.96
3.84
0.00
72.00
4.96
3.84
0.00
73.00
4.96
3.84
0.00
74.00
4.96
3.84
0.00
75.00
4.96
3.84
0.00
76.00
4.96
3.84
0.00
77.00
4.96
3.84
0.00
78.00
4.96
3.84
0.00
79.00
4.96
3.84
0.00
80.00
4.96
3.84
0.00
81.00
4.96
3.84
0.00
82.00
4.96
3.84
0.00
83.00
4.96
3.84
0.00
84.00
4.96
3.84
0.00
85.00
4.96
3.84
0.00
86.00
4.96
3.84
0.00
87.00
4.96
3.84
0.00
88.00
4.96
3.84
0.00
89.00
4.96
3.84
0.00
90.00
4.96
3.84
0.00
91.00
4.96
3.84
0.00
92.00
4.96
3.84
0.00
93.00
4.96
3.84
0.00
94.00
4.96
3.84
0.00
95.00
4.96
3.84
0.00
96.00
4.96
3.84
0.00
97.00
4.96
3.84
0.00
98.00
4.96
3.84
0.00
99.00
4.96
3.84
0.00
100.00
4.96
3.84
0.00
101.00
4.96
3.84
0.00
102.00
4.96
3.84
0.00
103.00
4.96
3.84
0.00
104.00
4.96
3.84
0.00
105.00
4.96
3.84
0.00
106.00
4.96
3.84
0.00
107.00
4.96
3.84
0.00
108.00
4.96
3.84
0.00
109.00
4.96
3.84
0.00
110.00
4.96
3.84
0.00
111.00
4.96
3.84
0.00
112.00
4.96
3.84
0.00
113.00
4.96
3.84
0.00
114.00
4.96
3.84
0.00
115.00
4.96
3.84
0.00
116.00
4.96
3.84
0.00
117.00
4.96
3.84
0.00
118.00
4.96
3.84
0.00
119.00
4.96
3.84
0.00
120.00
4.96
3.84
0.00

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 4
Summary for Subcatchment 4S: PRE (OUTFALL #1)
Runoff = 101.03 cfs @ 12.16 hrs, Volume= 8.084 af, Depth= 2.25"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN Description
9.130 55 Woods, Good, HSG B
34.000 78 Row crops, straight row, Good, HSG B
43.130 73 Weighted Average
43.130 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 4S: PRE (OUTFALL #1)
Hydrograph
-
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 5
Hydrograph for Subcatchment 4S: PRE (OUTFALL #1)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.00
6.00
0.40
0.00
0.00
7.00
0.49
0.00
0.00
8.00
0.60
0.00
0.00
9.00
0.73
0.00
0.00
10.00
0.90
0.01
0.38
11.00
1.17
0.04
1.95
12.00
3.29
1.04
59.86
13.00
3.83
1.41
12.61
14.00
4.07
1.58
6.80
15.00
4.23
1.70
5.11
16.00
4.36
1.79
4.06
17.00
4.47
1.88
3.45
18.00
4.57
1.95
3.08
19.00
4.65
2.01
2.69
20.00
4.72
2.06
2.29
21.00
4.79
2.11
2.11
22.00
4.85
2.16
2.03
23.00
4.90
2.21
1.96
24.00
4.96
2.25
1.88
25.00
4.96
2.25
0.01
26.00
4.96
2.25
0.00
27.00
4.96
2.25
0.00
28.00
4.96
2.25
0.00
29.00
4.96
2.25
0.00
30.00
4.96
2.25
0.00
31.00
4.96
2.25
0.00
32.00
4.96
2.25
0.00
33.00
4.96
2.25
0.00
34.00
4.96
2.25
0.00
35.00
4.96
2.25
0.00
36.00
4.96
2.25
0.00
37.00
4.96
2.25
0.00
38.00
4.96
2.25
0.00
39.00
4.96
2.25
0.00
40.00
4.96
2.25
0.00
41.00
4.96
2.25
0.00
42.00
4.96
2.25
0.00
43.00
4.96
2.25
0.00
44.00
4.96
2.25
0.00
45.00
4.96
2.25
0.00
46.00
4.96
2.25
0.00
47.00
4.96
2.25
0.00
48.00
4.96
2.25
0.00
49.00
4.96
2.25
0.00
50.00
4.96
2.25
0.00
51.00
4.96
2.25
0.00
52.00
4.96
2.25
0.00
53.00
4.96
2.25
0.00
54.00
4.96
2.25
0.00
55.00
4.96
2.25
0.00
56.00
4.96
2.25
0.00
57.00
4.96
2.25
0.00
58.00
4.96
2.25
0.00
59.00
4.96
2.25
0.00
60.00
4.96
2.25
0.00
61.00
4.96
2.25
0.00
62.00
4.96
2.25
0.00
63.00
4.96
2.25
0.00
64.00
4.96
2.25
0.00
65.00
4.96
2.25
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
2.25
0.00
67.00
4.96
2.25
0.00
68.00
4.96
2.25
0.00
69.00
4.96
2.25
0.00
70.00
4.96
2.25
0.00
71.00
4.96
2.25
0.00
72.00
4.96
2.25
0.00
73.00
4.96
2.25
0.00
74.00
4.96
2.25
0.00
75.00
4.96
2.25
0.00
76.00
4.96
2.25
0.00
77.00
4.96
2.25
0.00
78.00
4.96
2.25
0.00
79.00
4.96
2.25
0.00
80.00
4.96
2.25
0.00
81.00
4.96
2.25
0.00
82.00
4.96
2.25
0.00
83.00
4.96
2.25
0.00
84.00
4.96
2.25
0.00
85.00
4.96
2.25
0.00
86.00
4.96
2.25
0.00
87.00
4.96
2.25
0.00
88.00
4.96
2.25
0.00
89.00
4.96
2.25
0.00
90.00
4.96
2.25
0.00
91.00
4.96
2.25
0.00
92.00
4.96
2.25
0.00
93.00
4.96
2.25
0.00
94.00
4.96
2.25
0.00
95.00
4.96
2.25
0.00
96.00
4.96
2.25
0.00
97.00
4.96
2.25
0.00
98.00
4.96
2.25
0.00
99.00
4.96
2.25
0.00
100.00
4.96
2.25
0.00
101.00
4.96
2.25
0.00
102.00
4.96
2.25
0.00
103.00
4.96
2.25
0.00
104.00
4.96
2.25
0.00
105.00
4.96
2.25
0.00
106.00
4.96
2.25
0.00
107.00
4.96
2.25
0.00
108.00
4.96
2.25
0.00
109.00
4.96
2.25
0.00
110.00
4.96
2.25
0.00
111.00
4.96
2.25
0.00
112.00
4.96
2.25
0.00
113.00
4.96
2.25
0.00
114.00
4.96
2.25
0.00
115.00
4.96
2.25
0.00
116.00
4.96
2.25
0.00
117.00
4.96
2.25
0.00
118.00
4.96
2.25
0.00
119.00
4.96
2.25
0.00
120.00
4.96
2.25
0.00

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 6
Summary for Subcatchment 5S: PRE (OUTFALL #2)
Runoff = 140.95 cfs @ 12.15 hrs, Volume= 11.246 af, Depth= 2.33"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN Description
10.200 55 Woods, Good, HSG B
47.660 78 Row crops, straight row, Good, HSG B
57.860 74 Weighted Average
57.860 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 5S: PRE (OUTFALL #2)
Hydrograph
-----------,--,--,----------
-,---,-- ■Runoff
150140.95 cfs 1-------- -- -- -- ----------- -- ------------ -- --
130 lbyj--2 F11;1 C�ir, f-aH-=4496" _
--I-- +--+--+--+--+----+--+--+--+--I-
120
-
-------------------------------
110 n d ��ear arc
------+--+ - - + - - I + - - I- - 4 - - + - -
1007 Ru'Indff Vdlufn6=111.246 elf
w
90
--I----rt--t--r--'r--I-- ----t--r-----I-- r � r3';
N '��aff Dept-12:I�"-
3
80
-- - - - -- -- -- - - ---If �w �ePgth=1; F-
LL 70
---- PPYY11 P1
60--1--i--L--IL----J--1--1--L--------'-- --i-- ��- -� �� S!■��! -
50 � J y�
--r- r-
-r--r--r--r--i--r--r--r--r--r--r--i--r--r--r- -r--r- r=F7"F-
40 1 - - L - - L - -' - - L - - 1 - - 1 - - L - -'- - -'- - -' - - 1 - - 1 - - L - -'- - -'- - -' - - 1 - - 1 - -
30
-
-r---T--r--r--+------T- -T--r T- -T- -r T--T--
20
--I-- +--+--+--+--+--I--+--+--+--+--I---I---I--+--+--+--I---I---I--+--+--
10
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 7
Hydrograph for Subcatchment 5S: PRE (OUTFALL #2)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.00
6.00
0.40
0.00
0.00
7.00
0.49
0.00
0.00
8.00
0.60
0.00
0.00
9.00
0.73
0.00
0.00
10.00
0.90
0.01
0.73
11.00
1.17
0.05
3.01
12.00
3.29
1.10
84.41
13.00
3.83
1.47
17.35
14.00
4.07
1.65
9.33
15.00
4.23
1.77
7.00
16.00
4.36
1.87
5.56
17.00
4.47
1.95
4.73
18.00
4.57
2.02
4.21
19.00
4.65
2.09
3.67
20.00
4.72
2.14
3.13
21.00
4.79
2.19
2.88
22.00
4.85
2.24
2.78
23.00
4.90
2.29
2.67
24.00
4.96
2.33
2.57
25.00
4.96
2.33
0.01
26.00
4.96
2.33
0.00
27.00
4.96
2.33
0.00
28.00
4.96
2.33
0.00
29.00
4.96
2.33
0.00
30.00
4.96
2.33
0.00
31.00
4.96
2.33
0.00
32.00
4.96
2.33
0.00
33.00
4.96
2.33
0.00
34.00
4.96
2.33
0.00
35.00
4.96
2.33
0.00
36.00
4.96
2.33
0.00
37.00
4.96
2.33
0.00
38.00
4.96
2.33
0.00
39.00
4.96
2.33
0.00
40.00
4.96
2.33
0.00
41.00
4.96
2.33
0.00
42.00
4.96
2.33
0.00
43.00
4.96
2.33
0.00
44.00
4.96
2.33
0.00
45.00
4.96
2.33
0.00
46.00
4.96
2.33
0.00
47.00
4.96
2.33
0.00
48.00
4.96
2.33
0.00
49.00
4.96
2.33
0.00
50.00
4.96
2.33
0.00
51.00
4.96
2.33
0.00
52.00
4.96
2.33
0.00
53.00
4.96
2.33
0.00
54.00
4.96
2.33
0.00
55.00
4.96
2.33
0.00
56.00
4.96
2.33
0.00
57.00
4.96
2.33
0.00
58.00
4.96
2.33
0.00
59.00
4.96
2.33
0.00
60.00
4.96
2.33
0.00
61.00
4.96
2.33
0.00
62.00
4.96
2.33
0.00
63.00
4.96
2.33
0.00
64.00
4.96
2.33
0.00
65.00
4.96
2.33
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
2.33
0.00
67.00
4.96
2.33
0.00
68.00
4.96
2.33
0.00
69.00
4.96
2.33
0.00
70.00
4.96
2.33
0.00
71.00
4.96
2.33
0.00
72.00
4.96
2.33
0.00
73.00
4.96
2.33
0.00
74.00
4.96
2.33
0.00
75.00
4.96
2.33
0.00
76.00
4.96
2.33
0.00
77.00
4.96
2.33
0.00
78.00
4.96
2.33
0.00
79.00
4.96
2.33
0.00
80.00
4.96
2.33
0.00
81.00
4.96
2.33
0.00
82.00
4.96
2.33
0.00
83.00
4.96
2.33
0.00
84.00
4.96
2.33
0.00
85.00
4.96
2.33
0.00
86.00
4.96
2.33
0.00
87.00
4.96
2.33
0.00
88.00
4.96
2.33
0.00
89.00
4.96
2.33
0.00
90.00
4.96
2.33
0.00
91.00
4.96
2.33
0.00
92.00
4.96
2.33
0.00
93.00
4.96
2.33
0.00
94.00
4.96
2.33
0.00
95.00
4.96
2.33
0.00
96.00
4.96
2.33
0.00
97.00
4.96
2.33
0.00
98.00
4.96
2.33
0.00
99.00
4.96
2.33
0.00
100.00
4.96
2.33
0.00
101.00
4.96
2.33
0.00
102.00
4.96
2.33
0.00
103.00
4.96
2.33
0.00
104.00
4.96
2.33
0.00
105.00
4.96
2.33
0.00
106.00
4.96
2.33
0.00
107.00
4.96
2.33
0.00
108.00
4.96
2.33
0.00
109.00
4.96
2.33
0.00
110.00
4.96
2.33
0.00
111.00
4.96
2.33
0.00
112.00
4.96
2.33
0.00
113.00
4.96
2.33
0.00
114.00
4.96
2.33
0.00
115.00
4.96
2.33
0.00
116.00
4.96
2.33
0.00
117.00
4.96
2.33
0.00
118.00
4.96
2.33
0.00
119.00
4.96
2.33
0.00
120.00
4.96
2.33
0.00

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 8
Summary for Subcatchment 6S: PRE (OUTFALL #3)
Runoff = 34.97 cfs @ 12.16 hrs, Volume= 2.798 af, Depth= 2.25"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN Description
3.190 55 Woods, Good, HSG B
11.740 78 Row crops, straight row, Good, HSG B
14.930 73 Weighted Average
14.930 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 6S: PRE (OUTFALL #3)
Hydrograph
38
36
34
--I-
I-
--I--t--t--t--r--t-------t--t--t--t--t--r--t--I--t--t--t--t--r--
cfs--t--t--r--�---�---�--�--rt--rt--�--r--r--�---�--t--�--t--r--r--
---t--t--r--r--t-------t--t--t--r--r--r--t----t--tt--7-- r--
---,--7--r--r----------T--T--T--T--T--T----- �T�pO-�T���b�� -
■Runoff
34.97
----
--��--
32
30-
--�--
--- ----T--T------------rt--'t0yrTlOrRai nfa ll--4.96�"'
28
'
----
---T--T--T--T------------T--T-RLthoff Ar6& 14.930-at -
26
24
----
r r
---,--T--t--7-------I-- ----�nPff-VPI�-m'e=2. � -a�f--
w 22
-U 20
-
--��--
----
---,--T--T--T----------------T-- �. ��4-
Run�#�DupthT2.25� --
--T--t--7--7------- -- -- --t-FIbW
16
14
----
--
-T-- T--T--T---------T--T--T--T--T�I---
12
I
I I I I I I I I I I I I I
1 -1 T - - T - - 7 - - � - - - - - - - 7 - - 7 - - 7 - - T - - 7 - - 7 - - I - - - - - 7 - - 7 - � N = 7 a -
10
--�--
-------� --�----------------� --� ------------------------
8
----
---
6
----
--- -- -- --------------- -- -- --------------- -- -- -----
4
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 9
Hydrograph for Subcatchment 6S: PRE (OUTFALL #3)
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.00
6.00
0.40
0.00
0.00
7.00
0.49
0.00
0.00
8.00
0.60
0.00
0.00
9.00
0.73
0.00
0.00
10.00
0.90
0.01
0.13
11.00
1.17
0.04
0.68
12.00
3.29
1.04
20.72
13.00
3.83
1.41
4.37
14.00
4.07
1.58
2.35
15.00
4.23
1.70
1.77
16.00
4.36
1.79
1.41
17.00
4.47
1.88
1.20
18.00
4.57
1.95
1.06
19.00
4.65
2.01
0.93
20.00
4.72
2.06
0.79
21.00
4.79
2.11
0.73
22.00
4.85
2.16
0.70
23.00
4.90
2.21
0.68
24.00
4.96
2.25
0.65
25.00
4.96
2.25
0.00
26.00
4.96
2.25
0.00
27.00
4.96
2.25
0.00
28.00
4.96
2.25
0.00
29.00
4.96
2.25
0.00
30.00
4.96
2.25
0.00
31.00
4.96
2.25
0.00
32.00
4.96
2.25
0.00
33.00
4.96
2.25
0.00
34.00
4.96
2.25
0.00
35.00
4.96
2.25
0.00
36.00
4.96
2.25
0.00
37.00
4.96
2.25
0.00
38.00
4.96
2.25
0.00
39.00
4.96
2.25
0.00
40.00
4.96
2.25
0.00
41.00
4.96
2.25
0.00
42.00
4.96
2.25
0.00
43.00
4.96
2.25
0.00
44.00
4.96
2.25
0.00
45.00
4.96
2.25
0.00
46.00
4.96
2.25
0.00
47.00
4.96
2.25
0.00
48.00
4.96
2.25
0.00
49.00
4.96
2.25
0.00
50.00
4.96
2.25
0.00
51.00
4.96
2.25
0.00
52.00
4.96
2.25
0.00
53.00
4.96
2.25
0.00
54.00
4.96
2.25
0.00
55.00
4.96
2.25
0.00
56.00
4.96
2.25
0.00
57.00
4.96
2.25
0.00
58.00
4.96
2.25
0.00
59.00
4.96
2.25
0.00
60.00
4.96
2.25
0.00
61.00
4.96
2.25
0.00
62.00
4.96
2.25
0.00
63.00
4.96
2.25
0.00
64.00
4.96
2.25
0.00
65.00
4.96
2.25
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
2.25
0.00
67.00
4.96
2.25
0.00
68.00
4.96
2.25
0.00
69.00
4.96
2.25
0.00
70.00
4.96
2.25
0.00
71.00
4.96
2.25
0.00
72.00
4.96
2.25
0.00
73.00
4.96
2.25
0.00
74.00
4.96
2.25
0.00
75.00
4.96
2.25
0.00
76.00
4.96
2.25
0.00
77.00
4.96
2.25
0.00
78.00
4.96
2.25
0.00
79.00
4.96
2.25
0.00
80.00
4.96
2.25
0.00
81.00
4.96
2.25
0.00
82.00
4.96
2.25
0.00
83.00
4.96
2.25
0.00
84.00
4.96
2.25
0.00
85.00
4.96
2.25
0.00
86.00
4.96
2.25
0.00
87.00
4.96
2.25
0.00
88.00
4.96
2.25
0.00
89.00
4.96
2.25
0.00
90.00
4.96
2.25
0.00
91.00
4.96
2.25
0.00
92.00
4.96
2.25
0.00
93.00
4.96
2.25
0.00
94.00
4.96
2.25
0.00
95.00
4.96
2.25
0.00
96.00
4.96
2.25
0.00
97.00
4.96
2.25
0.00
98.00
4.96
2.25
0.00
99.00
4.96
2.25
0.00
100.00
4.96
2.25
0.00
101.00
4.96
2.25
0.00
102.00
4.96
2.25
0.00
103.00
4.96
2.25
0.00
104.00
4.96
2.25
0.00
105.00
4.96
2.25
0.00
106.00
4.96
2.25
0.00
107.00
4.96
2.25
0.00
108.00
4.96
2.25
0.00
109.00
4.96
2.25
0.00
110.00
4.96
2.25
0.00
111.00
4.96
2.25
0.00
112.00
4.96
2.25
0.00
113.00
4.96
2.25
0.00
114.00
4.96
2.25
0.00
115.00
4.96
2.25
0.00
116.00
4.96
2.25
0.00
117.00
4.96
2.25
0.00
118.00
4.96
2.25
0.00
119.00
4.96
2.25
0.00
120.00
4.96
2.25
0.00

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 10
Summary for Subcatchment 7S: POST TO POND 3
Runoff = 94.73 cfs @ 11.95 hrs, Volume= 4.617 af, Depth= 3.63"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN
Description
11.010 98
Impervious
4.250 61
>75% Grass cover, Good, HSG B
15.260 88
Weighted Average
4.250
27.85% Pervious Area
11.010
72.15% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 7S: POST TO POND 3
Hydrograph
105
100
-------+--+--+--+--+-+--+--+--+--+--+----+--+--+--+--+--+-+--+--+--
cfs-rt--fi--r--'r--I-- ----t--r--------I-- --fi--r-------------t--
■Runoff
94.73
95
YIP ----II----- 1
90
85
----
--'--
---- -- ------------ -- ------------ -- --I -
--'- --' --'---------- --' --' A r 24 r Rainfall-4.9611-
80
75
- - - -
- - - - - - - - - - - - - - - - - + - - - - - - - - - -I- - j - - T - - L - - - - -I- - -I- - 1 - - T - -
Ru hoff 7fillIr-da-,6-1-5.-260 at -
65
--; -
--- --; --;--Ir------ -- --r Llnp VQ1gme7-4 zkf -
w 60
- '
J1---- -----1_-Runoff Dbh.-655
--1--L--L--1--1-- L
0 50
EL 45
----
--r-
-- -- -- -- ---- -- --+------------
y--rt--+--r--r----y-- --+--r--r-------y--+--r--r-------rt--+--
40
--Ir---rt--r--r--Ir--------t--r--Ir--------r--r--Ir---�=8-
35
_ _
- - T - - T - - r - - - -I - - T - - - - T - - r - - I - - I - I - T - - r - - T - - - - - - T - - T - -
30
-_I--
-I-- -- --I--I_----_I---- -- --------I---- _I --------I-- -- --
I I I I I I I I I I I I I I I I I I I
25
--I--
-I--! --! --! --------I--! -- + --!----------!--! --! --------I--! -- + --
20
--I--
-- -- --r-- --I-- ----+--r--------I-- ----r--------I-- --+--
15
--+-
+--+--+--+--+-+--+--+--+--+----------+--+--+-----+-+--+--+--
10
�I
--Ir
---7--r--r--r----7--------r--Ir--Ir-------r--r-Ir--Ir--Ii-- --rt--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 11
Hydrograph for Subcatchment 7S: POST TO POND 3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.06
6.00
0.40
0.01
0.21
7.00
0.49
0.03
0.38
8.00
0.60
0.06
0.57
9.00
0.73
0.11
1.03
10.00
0.90
0.20
1.55
11.00
1.17
0.35
3.29
12.00
3.29
2.08
80.40
13.00
3.83
2.57
4.58
14.00
4.07
2.79
2.73
15.00
4.23
2.95
2.18
16.00
4.36
3.07
1.68
17.00
4.47
3.17
1.48
18.00
4.57
3.26
1.31
19.00
4.65
3.34
1.13
20.00
4.72
3.41
0.95
21.00
4.79
3.47
0.91
22.00
4.85
3.52
0.87
23.00
4.90
3.58
0.83
24.00
4.96
3.63
0.80
25.00
4.96
3.63
0.00
26.00
4.96
3.63
0.00
27.00
4.96
3.63
0.00
28.00
4.96
3.63
0.00
29.00
4.96
3.63
0.00
30.00
4.96
3.63
0.00
31.00
4.96
3.63
0.00
32.00
4.96
3.63
0.00
33.00
4.96
3.63
0.00
34.00
4.96
3.63
0.00
35.00
4.96
3.63
0.00
36.00
4.96
3.63
0.00
37.00
4.96
3.63
0.00
38.00
4.96
3.63
0.00
39.00
4.96
3.63
0.00
40.00
4.96
3.63
0.00
41.00
4.96
3.63
0.00
42.00
4.96
3.63
0.00
43.00
4.96
3.63
0.00
44.00
4.96
3.63
0.00
45.00
4.96
3.63
0.00
46.00
4.96
3.63
0.00
47.00
4.96
3.63
0.00
48.00
4.96
3.63
0.00
49.00
4.96
3.63
0.00
50.00
4.96
3.63
0.00
51.00
4.96
3.63
0.00
52.00
4.96
3.63
0.00
53.00
4.96
3.63
0.00
54.00
4.96
3.63
0.00
55.00
4.96
3.63
0.00
56.00
4.96
3.63
0.00
57.00
4.96
3.63
0.00
58.00
4.96
3.63
0.00
59.00
4.96
3.63
0.00
60.00
4.96
3.63
0.00
61.00
4.96
3.63
0.00
62.00
4.96
3.63
0.00
63.00
4.96
3.63
0.00
64.00
4.96
3.63
0.00
65.00
4.96
3.63
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
3.63
0.00
67.00
4.96
3.63
0.00
68.00
4.96
3.63
0.00
69.00
4.96
3.63
0.00
70.00
4.96
3.63
0.00
71.00
4.96
3.63
0.00
72.00
4.96
3.63
0.00
73.00
4.96
3.63
0.00
74.00
4.96
3.63
0.00
75.00
4.96
3.63
0.00
76.00
4.96
3.63
0.00
77.00
4.96
3.63
0.00
78.00
4.96
3.63
0.00
79.00
4.96
3.63
0.00
80.00
4.96
3.63
0.00
81.00
4.96
3.63
0.00
82.00
4.96
3.63
0.00
83.00
4.96
3.63
0.00
84.00
4.96
3.63
0.00
85.00
4.96
3.63
0.00
86.00
4.96
3.63
0.00
87.00
4.96
3.63
0.00
88.00
4.96
3.63
0.00
89.00
4.96
3.63
0.00
90.00
4.96
3.63
0.00
91.00
4.96
3.63
0.00
92.00
4.96
3.63
0.00
93.00
4.96
3.63
0.00
94.00
4.96
3.63
0.00
95.00
4.96
3.63
0.00
96.00
4.96
3.63
0.00
97.00
4.96
3.63
0.00
98.00
4.96
3.63
0.00
99.00
4.96
3.63
0.00
100.00
4.96
3.63
0.00
101.00
4.96
3.63
0.00
102.00
4.96
3.63
0.00
103.00
4.96
3.63
0.00
104.00
4.96
3.63
0.00
105.00
4.96
3.63
0.00
106.00
4.96
3.63
0.00
107.00
4.96
3.63
0.00
108.00
4.96
3.63
0.00
109.00
4.96
3.63
0.00
110.00
4.96
3.63
0.00
111.00
4.96
3.63
0.00
112.00
4.96
3.63
0.00
113.00
4.96
3.63
0.00
114.00
4.96
3.63
0.00
115.00
4.96
3.63
0.00
116.00
4.96
3.63
0.00
117.00
4.96
3.63
0.00
118.00
4.96
3.63
0.00
119.00
4.96
3.63
0.00
120.00
4.96
3.63
0.00

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 12
Summary for Subcatchment 9S: POST TO POND 4
Runoff = 64.12 cfs @ 11.95 hrs, Volume= 3.103 af, Depth= 3.53"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN Description
7.330 98 Impervious
3.220 61 >75% Grass cover, Good, HSG B
10.550 87 Weighted Average
3.220 30.52% Pervious Area
7.330 69.48% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 9S: POST TO POND 4
Hydrograph
-------------7--r------------ -- ----T--r---------,--,--7--r-- --
70 ❑Runoff
64.12 Cfs -- -- - -- -- ----- -- -- - - -
65 -- --+-- -- --' -- -- -- -- --' -- Type-N24-hr -
---------------- --- ------'tOrT2hR,ainfarh.96,'�-
55
--------------------- ------ - - - - -- ------------
50 Runoff Arch=0. 155a arc
--�----�--�--1--L--�--1---1---1--J--1--1--�--L--L--�---�--J--�--1--L--L--
45 - 'RpnpffrVpl 1 e=3.1I Q$-1f -
w 40 1 n
T - -T -------- ----7--T--Runes# D�pt�a,531,
3 35
30
--i-- --i-- --+-- ----------i-- -- -- -- -- -------i-- -- - w' -
25
--r-
---- -- -- ------------ -- -- -- -- --------- -- -- -- -- --
20
15
10
5
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 13
Hydrograph for Subcatchment 9S: POST TO POND 4
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.01
6.00
0.40
0.01
0.11
7.00
0.49
0.02
0.22
8.00
0.60
0.05
0.34
9.00
0.73
0.10
0.64
10.00
0.90
0.17
0.99
11.00
1.17
0.32
2.15
12.00
3.29
1.99
54.55
13.00
3.83
2.48
3.12
14.00
4.07
2.70
1.87
15.00
4.23
2.85
1.49
16.00
4.36
2.97
1.15
17.00
4.47
3.07
1.02
18.00
4.57
3.16
0.90
19.00
4.65
3.24
0.77
20.00
4.72
3.31
0.65
21.00
4.79
3.37
0.62
22.00
4.85
3.42
0.60
23.00
4.90
3.48
0.57
24.00
4.96
3.53
0.55
25.00
4.96
3.53
0.00
26.00
4.96
3.53
0.00
27.00
4.96
3.53
0.00
28.00
4.96
3.53
0.00
29.00
4.96
3.53
0.00
30.00
4.96
3.53
0.00
31.00
4.96
3.53
0.00
32.00
4.96
3.53
0.00
33.00
4.96
3.53
0.00
34.00
4.96
3.53
0.00
35.00
4.96
3.53
0.00
36.00
4.96
3.53
0.00
37.00
4.96
3.53
0.00
38.00
4.96
3.53
0.00
39.00
4.96
3.53
0.00
40.00
4.96
3.53
0.00
41.00
4.96
3.53
0.00
42.00
4.96
3.53
0.00
43.00
4.96
3.53
0.00
44.00
4.96
3.53
0.00
45.00
4.96
3.53
0.00
46.00
4.96
3.53
0.00
47.00
4.96
3.53
0.00
48.00
4.96
3.53
0.00
49.00
4.96
3.53
0.00
50.00
4.96
3.53
0.00
51.00
4.96
3.53
0.00
52.00
4.96
3.53
0.00
53.00
4.96
3.53
0.00
54.00
4.96
3.53
0.00
55.00
4.96
3.53
0.00
56.00
4.96
3.53
0.00
57.00
4.96
3.53
0.00
58.00
4.96
3.53
0.00
59.00
4.96
3.53
0.00
60.00
4.96
3.53
0.00
61.00
4.96
3.53
0.00
62.00
4.96
3.53
0.00
63.00
4.96
3.53
0.00
64.00
4.96
3.53
0.00
65.00
4.96
3.53
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
3.53
0.00
67.00
4.96
3.53
0.00
68.00
4.96
3.53
0.00
69.00
4.96
3.53
0.00
70.00
4.96
3.53
0.00
71.00
4.96
3.53
0.00
72.00
4.96
3.53
0.00
73.00
4.96
3.53
0.00
74.00
4.96
3.53
0.00
75.00
4.96
3.53
0.00
76.00
4.96
3.53
0.00
77.00
4.96
3.53
0.00
78.00
4.96
3.53
0.00
79.00
4.96
3.53
0.00
80.00
4.96
3.53
0.00
81.00
4.96
3.53
0.00
82.00
4.96
3.53
0.00
83.00
4.96
3.53
0.00
84.00
4.96
3.53
0.00
85.00
4.96
3.53
0.00
86.00
4.96
3.53
0.00
87.00
4.96
3.53
0.00
88.00
4.96
3.53
0.00
89.00
4.96
3.53
0.00
90.00
4.96
3.53
0.00
91.00
4.96
3.53
0.00
92.00
4.96
3.53
0.00
93.00
4.96
3.53
0.00
94.00
4.96
3.53
0.00
95.00
4.96
3.53
0.00
96.00
4.96
3.53
0.00
97.00
4.96
3.53
0.00
98.00
4.96
3.53
0.00
99.00
4.96
3.53
0.00
100.00
4.96
3.53
0.00
101.00
4.96
3.53
0.00
102.00
4.96
3.53
0.00
103.00
4.96
3.53
0.00
104.00
4.96
3.53
0.00
105.00
4.96
3.53
0.00
106.00
4.96
3.53
0.00
107.00
4.96
3.53
0.00
108.00
4.96
3.53
0.00
109.00
4.96
3.53
0.00
110.00
4.96
3.53
0.00
111.00
4.96
3.53
0.00
112.00
4.96
3.53
0.00
113.00
4.96
3.53
0.00
114.00
4.96
3.53
0.00
115.00
4.96
3.53
0.00
116.00
4.96
3.53
0.00
117.00
4.96
3.53
0.00
118.00
4.96
3.53
0.00
119.00
4.96
3.53
0.00
120.00
4.96
3.53
0.00

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 14
Summary for Subcatchment 12S: POST TO POND 1
Runoff = 200.18 cfs @ 11.95 hrs, Volume= 9.917 af, Depth= 3.84"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN
Description
24.280 98
Impervious
6.730 61
>75% Grass cover, Good, HSG B
31.010 90
Weighted Average
6.730
21.70% Pervious Area
24.280
78.30% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 12S: POST TO POND 1
Hydrograph
220--1---1--J--1--L--L--L----J----L--L--------'----L--L----------1--L-- �RUnoff
210 200.18 cfs --+I --+I --+r --+I --
200 ----- --r--
--
+ + 1(2 f,r.
190 --'-- --'----------------'------------------ ----- Yip�i--- -- ----
180
170--r——+--+--+--r--r—+--+--+--+--r--I
160 ---- --�I----+--r--------1I-- 1-- 1--+--�- Ru17Vff MT-1de"-31.V1 V-a
150 �' --'-- - ----L--L-- --'-- -- I -- I --I --'---'-- I-- I-- I --I -- - --' - --'-- I-- I --
I I I I I I I I I I I I I Ii i i i ii
140 --i-- ---+--+--+------+--+--+--+-- � p*`, Vg14m --(�ia•
W 130 --I-- - 1-- 7-- T -- T -- T - -II- - 1-- T -- T -- T -- I--- I - - - I --,-- T-- r---- - II - -- I-- 7--+--
�I I
120 ' I - - ' - ---'-- -- ' - - ----- Runoff Depfh=3 ,V
110 --'-- J--1--1--L--+--1--J--1--1--L--1------'-- --i-----�'----1--1y�--
Lo 100 --+-+--+--+--+--+-+--+--+--+--+--+----+--+--+--+- � :�-
,i
90
80 --'-- -- -- _ _9i
-------------------------i--T
70 --'-- J--1--1--L--L----J----L--L--------'-- --L-- --1---1---1--1--L--
�I I I I I I I I I I I I I I I I I I I I I I I
60 --I-- +--+--+--r--+--I--+--+--+--+--I---I---I--+--+--+--I---I---I--+--+--
�i
50 --li - -II-- it -- + -- I, --r--�i-- -II-- it -- it -- + --�i--�i---II-- it-- + --Ir --�r--�i---II-- it -- it --
40 --'-- -'---'--'---'---'---'---'---'--'---'---'---'---'---'--'---'---'---'---'---'--'---
,I I I I I I I I I I I I I I I I I I I I I I I
30 --'-- J--1--1--L----1--J--1--1--L--1------'-- --+-- ----------1--+--
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 15
Hydrograph for Subcatchment 12S: POST TO POND 1
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.04
5.00
0.31
0.01
0.33
6.00
0.40
0.02
0.68
7.00
0.49
0.05
1.06
8.00
0.60
0.09
1.47
9.00
0.73
0.16
2.52
10.00
0.90
0.26
3.65
11.00
1.17
0.43
7.48
12.00
3.29
2.25
169.10
13.00
3.83
2.76
9.52
14.00
4.07
2.98
5.68
15.00
4.23
3.14
4.51
16.00
4.36
3.27
3.49
17.00
4.47
3.37
3.07
18.00
4.57
3.46
2.70
19.00
4.65
3.54
2.34
20.00
4.72
3.61
1.97
21.00
4.79
3.67
1.87
22.00
4.85
3.73
1.80
23.00
4.90
3.78
1.72
24.00
4.96
3.84
1.65
25.00
4.96
3.84
0.00
26.00
4.96
3.84
0.00
27.00
4.96
3.84
0.00
28.00
4.96
3.84
0.00
29.00
4.96
3.84
0.00
30.00
4.96
3.84
0.00
31.00
4.96
3.84
0.00
32.00
4.96
3.84
0.00
33.00
4.96
3.84
0.00
34.00
4.96
3.84
0.00
35.00
4.96
3.84
0.00
36.00
4.96
3.84
0.00
37.00
4.96
3.84
0.00
38.00
4.96
3.84
0.00
39.00
4.96
3.84
0.00
40.00
4.96
3.84
0.00
41.00
4.96
3.84
0.00
42.00
4.96
3.84
0.00
43.00
4.96
3.84
0.00
44.00
4.96
3.84
0.00
45.00
4.96
3.84
0.00
46.00
4.96
3.84
0.00
47.00
4.96
3.84
0.00
48.00
4.96
3.84
0.00
49.00
4.96
3.84
0.00
50.00
4.96
3.84
0.00
51.00
4.96
3.84
0.00
52.00
4.96
3.84
0.00
53.00
4.96
3.84
0.00
54.00
4.96
3.84
0.00
55.00
4.96
3.84
0.00
56.00
4.96
3.84
0.00
57.00
4.96
3.84
0.00
58.00
4.96
3.84
0.00
59.00
4.96
3.84
0.00
60.00
4.96
3.84
0.00
61.00
4.96
3.84
0.00
62.00
4.96
3.84
0.00
63.00
4.96
3.84
0.00
64.00
4.96
3.84
0.00
65.00
4.96
3.84
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
3.84
0.00
67.00
4.96
3.84
0.00
68.00
4.96
3.84
0.00
69.00
4.96
3.84
0.00
70.00
4.96
3.84
0.00
71.00
4.96
3.84
0.00
72.00
4.96
3.84
0.00
73.00
4.96
3.84
0.00
74.00
4.96
3.84
0.00
75.00
4.96
3.84
0.00
76.00
4.96
3.84
0.00
77.00
4.96
3.84
0.00
78.00
4.96
3.84
0.00
79.00
4.96
3.84
0.00
80.00
4.96
3.84
0.00
81.00
4.96
3.84
0.00
82.00
4.96
3.84
0.00
83.00
4.96
3.84
0.00
84.00
4.96
3.84
0.00
85.00
4.96
3.84
0.00
86.00
4.96
3.84
0.00
87.00
4.96
3.84
0.00
88.00
4.96
3.84
0.00
89.00
4.96
3.84
0.00
90.00
4.96
3.84
0.00
91.00
4.96
3.84
0.00
92.00
4.96
3.84
0.00
93.00
4.96
3.84
0.00
94.00
4.96
3.84
0.00
95.00
4.96
3.84
0.00
96.00
4.96
3.84
0.00
97.00
4.96
3.84
0.00
98.00
4.96
3.84
0.00
99.00
4.96
3.84
0.00
100.00
4.96
3.84
0.00
101.00
4.96
3.84
0.00
102.00
4.96
3.84
0.00
103.00
4.96
3.84
0.00
104.00
4.96
3.84
0.00
105.00
4.96
3.84
0.00
106.00
4.96
3.84
0.00
107.00
4.96
3.84
0.00
108.00
4.96
3.84
0.00
109.00
4.96
3.84
0.00
110.00
4.96
3.84
0.00
111.00
4.96
3.84
0.00
112.00
4.96
3.84
0.00
113.00
4.96
3.84
0.00
114.00
4.96
3.84
0.00
115.00
4.96
3.84
0.00
116.00
4.96
3.84
0.00
117.00
4.96
3.84
0.00
118.00
4.96
3.84
0.00
119.00
4.96
3.84
0.00
120.00
4.96
3.84
0.00

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 16
Summary for Subcatchment 14S: POST TO POND 6
Runoff = 87.79 cfs @ 11.95 hrs, Volume= 4.312 af, Depth= 3.73"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN
Description
10.310 98
Impervious
3.550 61
>75% Grass cover, Good, HSG B
13.860 89
Weighted Average
3.550
25.61 % Pervious Area
10.310
74.39% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry,
Subcatchment 14S: POST TO POND 6
Hydrograph
95--+--r--r--r-------------+--r--r--r----r----+--r--r--
90
Cfs
■Runoff
87.79
�
----
85
�
---- --+-- ----�r------- -- -- --+-- -------I�T pe-��124-hr -
80
--'--
--'----+--+----Ir------------- -IRS--
10 r l4h r- Rai nfa [[-- .9W
75
70
'
--Ir-
--'--
- -
----y--+--r--r--r-------y--rt--- - i- A q /y
--'-- --+--+-- --'II------'-- -- ---Ruhoff Ar6a=1a.g64-at -
65
60
'
--Ir-
----
----y--T--r--r--Ir--Ir----y--rt--1--+--r--Ir--Ir----y-- -- - r--
------T-- r-- r------------rt--�npfflrY-Q1µm,Ie=4, 1 0
w 55
50
--I--
--I--y--+--t--r--I---I---I--y--rt--rt- -+- - RunoffI a`pID thT 13'�I `-
3
45
--I--
--r-
--I--r--r--r--r--r--I---I--r--r--r-- r-- r-- r-- I---I--rT r--r--r--r--
----,--T--r--r--Ir------- -- ----r--r--Ir-------io5.�-�rl--
LL
40
35
----
--Ir-
w'
----r--r--r--r--r--I---I--r--r--r--r--r--r--I---I--r--r-�ly V$ -
-- I--r--r--r-- r--I---I--- I-- r-- r-- r-- r-- r--r--r-- I--r--r-- r-
30
--�
rrrr--r--r--I-- IrrrrrrI-Irrrr--r--
25
------ -- -- -- -- --
20
IrrrrrI-rrr--r1510
Li--
TTrirTTTrrr-1 -1 TrrI I I I I I I I I I I I I I I I I I I
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 17
Hydrograph for Subcatchment 14S: POST TO POND 6
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.10
6.00
0.40
0.02
0.24
7.00
0.49
0.04
0.41
8.00
0.60
0.08
0.58
9.00
0.73
0.14
1.03
10.00
0.90
0.22
1.52
11.00
1.17
0.39
3.16
12.00
3.29
2.16
74.33
13.00
3.83
2.66
4.21
14.00
4.07
2.89
2.51
15.00
4.23
3.04
2.00
16.00
4.36
3.17
1.54
17.00
4.47
3.27
1.36
18.00
4.57
3.36
1.20
19.00
4.65
3.44
1.04
20.00
4.72
3.51
0.87
21.00
4.79
3.57
0.83
22.00
4.85
3.62
0.80
23.00
4.90
3.68
0.76
24.00
4.96
3.73
0.73
25.00
4.96
3.73
0.00
26.00
4.96
3.73
0.00
27.00
4.96
3.73
0.00
28.00
4.96
3.73
0.00
29.00
4.96
3.73
0.00
30.00
4.96
3.73
0.00
31.00
4.96
3.73
0.00
32.00
4.96
3.73
0.00
33.00
4.96
3.73
0.00
34.00
4.96
3.73
0.00
35.00
4.96
3.73
0.00
36.00
4.96
3.73
0.00
37.00
4.96
3.73
0.00
38.00
4.96
3.73
0.00
39.00
4.96
3.73
0.00
40.00
4.96
3.73
0.00
41.00
4.96
3.73
0.00
42.00
4.96
3.73
0.00
43.00
4.96
3.73
0.00
44.00
4.96
3.73
0.00
45.00
4.96
3.73
0.00
46.00
4.96
3.73
0.00
47.00
4.96
3.73
0.00
48.00
4.96
3.73
0.00
49.00
4.96
3.73
0.00
50.00
4.96
3.73
0.00
51.00
4.96
3.73
0.00
52.00
4.96
3.73
0.00
53.00
4.96
3.73
0.00
54.00
4.96
3.73
0.00
55.00
4.96
3.73
0.00
56.00
4.96
3.73
0.00
57.00
4.96
3.73
0.00
58.00
4.96
3.73
0.00
59.00
4.96
3.73
0.00
60.00
4.96
3.73
0.00
61.00
4.96
3.73
0.00
62.00
4.96
3.73
0.00
63.00
4.96
3.73
0.00
64.00
4.96
3.73
0.00
65.00
4.96
3.73
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
3.73
0.00
67.00
4.96
3.73
0.00
68.00
4.96
3.73
0.00
69.00
4.96
3.73
0.00
70.00
4.96
3.73
0.00
71.00
4.96
3.73
0.00
72.00
4.96
3.73
0.00
73.00
4.96
3.73
0.00
74.00
4.96
3.73
0.00
75.00
4.96
3.73
0.00
76.00
4.96
3.73
0.00
77.00
4.96
3.73
0.00
78.00
4.96
3.73
0.00
79.00
4.96
3.73
0.00
80.00
4.96
3.73
0.00
81.00
4.96
3.73
0.00
82.00
4.96
3.73
0.00
83.00
4.96
3.73
0.00
84.00
4.96
3.73
0.00
85.00
4.96
3.73
0.00
86.00
4.96
3.73
0.00
87.00
4.96
3.73
0.00
88.00
4.96
3.73
0.00
89.00
4.96
3.73
0.00
90.00
4.96
3.73
0.00
91.00
4.96
3.73
0.00
92.00
4.96
3.73
0.00
93.00
4.96
3.73
0.00
94.00
4.96
3.73
0.00
95.00
4.96
3.73
0.00
96.00
4.96
3.73
0.00
97.00
4.96
3.73
0.00
98.00
4.96
3.73
0.00
99.00
4.96
3.73
0.00
100.00
4.96
3.73
0.00
101.00
4.96
3.73
0.00
102.00
4.96
3.73
0.00
103.00
4.96
3.73
0.00
104.00
4.96
3.73
0.00
105.00
4.96
3.73
0.00
106.00
4.96
3.73
0.00
107.00
4.96
3.73
0.00
108.00
4.96
3.73
0.00
109.00
4.96
3.73
0.00
110.00
4.96
3.73
0.00
111.00
4.96
3.73
0.00
112.00
4.96
3.73
0.00
113.00
4.96
3.73
0.00
114.00
4.96
3.73
0.00
115.00
4.96
3.73
0.00
116.00
4.96
3.73
0.00
117.00
4.96
3.73
0.00
118.00
4.96
3.73
0.00
119.00
4.96
3.73
0.00
120.00
4.96
3.73
0.00

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 18
Summary for Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Runoff = 48.41 cfs @ 11.96 hrs, Volume= 2.238 af, Depth= 2.17"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac) CN Description
3.800 98 Impervious
8.590 61 >75% Grass cover, Good, HSG B
12.390 72 Weighted Average
8.590 69.33% Pervious Area
3.800 30.67% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Hydrograph
--7--r--r--Ir--Ir--li-----------r--r--Ir--
50 48.41 cfs
--- ',Type-N 24-h� -
45
-- ------t--t--r----- I --- _-----rtlO�KT24hr-Raaftfa[[�4.96''--
40 1
- - - - - - 1 - - Ruhoff Ar6a=12-390 arc -
35
_ - -- -- -- --' -- -- Rqn( Vpl ime=2. 3$_4 -
H 30 I
Runoff IDupthT2.117" -
0 25 Tc"5.0 M i n
LL I I I I I I I I I I I I I I I I I
20 PN=7�
--r---I--y--t--L--r--r--I---I--y--rt--rt--L--r--r--r--I--y--�--t--r--r--
15
10
5
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 19
Hydrograph for Subcatchment 17S: UNDETAINED POST TO OUTFALL 1
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.00
6.00
0.40
0.00
0.00
7.00
0.49
0.00
0.00
8.00
0.60
0.00
0.00
9.00
0.73
0.00
0.00
10.00
0.90
0.00
0.12
11.00
1.17
0.04
0.69
12.00
3.29
0.99
42.96
13.00
3.83
1.34
2.75
14.00
4.07
1.51
1.68
15.00
4.23
1.63
1.36
16.00
4.36
1.72
1.06
17.00
4.47
1.80
0.94
18.00
4.57
1.87
0.84
19.00
4.65
1.93
0.73
20.00
4.72
1.99
0.62
21.00
4.79
2.03
0.59
22.00
4.85
2.08
0.57
23.00
4.90
2.12
0.55
24.00
4.96
2.17
0.52
25.00
4.96
2.17
0.00
26.00
4.96
2.17
0.00
27.00
4.96
2.17
0.00
28.00
4.96
2.17
0.00
29.00
4.96
2.17
0.00
30.00
4.96
2.17
0.00
31.00
4.96
2.17
0.00
32.00
4.96
2.17
0.00
33.00
4.96
2.17
0.00
34.00
4.96
2.17
0.00
35.00
4.96
2.17
0.00
36.00
4.96
2.17
0.00
37.00
4.96
2.17
0.00
38.00
4.96
2.17
0.00
39.00
4.96
2.17
0.00
40.00
4.96
2.17
0.00
41.00
4.96
2.17
0.00
42.00
4.96
2.17
0.00
43.00
4.96
2.17
0.00
44.00
4.96
2.17
0.00
45.00
4.96
2.17
0.00
46.00
4.96
2.17
0.00
47.00
4.96
2.17
0.00
48.00
4.96
2.17
0.00
49.00
4.96
2.17
0.00
50.00
4.96
2.17
0.00
51.00
4.96
2.17
0.00
52.00
4.96
2.17
0.00
53.00
4.96
2.17
0.00
54.00
4.96
2.17
0.00
55.00
4.96
2.17
0.00
56.00
4.96
2.17
0.00
57.00
4.96
2.17
0.00
58.00
4.96
2.17
0.00
59.00
4.96
2.17
0.00
60.00
4.96
2.17
0.00
61.00
4.96
2.17
0.00
62.00
4.96
2.17
0.00
63.00
4.96
2.17
0.00
64.00
4.96
2.17
0.00
65.00
4.96
2.17
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
2.17
0.00
67.00
4.96
2.17
0.00
68.00
4.96
2.17
0.00
69.00
4.96
2.17
0.00
70.00
4.96
2.17
0.00
71.00
4.96
2.17
0.00
72.00
4.96
2.17
0.00
73.00
4.96
2.17
0.00
74.00
4.96
2.17
0.00
75.00
4.96
2.17
0.00
76.00
4.96
2.17
0.00
77.00
4.96
2.17
0.00
78.00
4.96
2.17
0.00
79.00
4.96
2.17
0.00
80.00
4.96
2.17
0.00
81.00
4.96
2.17
0.00
82.00
4.96
2.17
0.00
83.00
4.96
2.17
0.00
84.00
4.96
2.17
0.00
85.00
4.96
2.17
0.00
86.00
4.96
2.17
0.00
87.00
4.96
2.17
0.00
88.00
4.96
2.17
0.00
89.00
4.96
2.17
0.00
90.00
4.96
2.17
0.00
91.00
4.96
2.17
0.00
92.00
4.96
2.17
0.00
93.00
4.96
2.17
0.00
94.00
4.96
2.17
0.00
95.00
4.96
2.17
0.00
96.00
4.96
2.17
0.00
97.00
4.96
2.17
0.00
98.00
4.96
2.17
0.00
99.00
4.96
2.17
0.00
100.00
4.96
2.17
0.00
101.00
4.96
2.17
0.00
102.00
4.96
2.17
0.00
103.00
4.96
2.17
0.00
104.00
4.96
2.17
0.00
105.00
4.96
2.17
0.00
106.00
4.96
2.17
0.00
107.00
4.96
2.17
0.00
108.00
4.96
2.17
0.00
109.00
4.96
2.17
0.00
110.00
4.96
2.17
0.00
111.00
4.96
2.17
0.00
112.00
4.96
2.17
0.00
113.00
4.96
2.17
0.00
114.00
4.96
2.17
0.00
115.00
4.96
2.17
0.00
116.00
4.96
2.17
0.00
117.00
4.96
2.17
0.00
118.00
4.96
2.17
0.00
119.00
4.96
2.17
0.00
120.00
4.96
2.17
0.00

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 20
Summary for Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Runoff = 15.17 cfs @ 12.18 hrs, Volume= 1.408 af, Depth= 1.15"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac)
CN
Description
7.730
55
Woods, Good, HSG B
7.000
61
>75% Grass cover, Good, HSG B
14.730
58
Weighted Average
14.730
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Hydrograph
----------+--+--+--+--+--�--+--+--+--+--+--+--+--+-+--+--+--+--+--+-- ■Runoff
16 15.17 cfs--i--L------------J--i--i-- --L--L-----1--J--1--1--L--L--
15-- -- -- -- Ili -- Ili -----Type,?4-h -
14
13-
12- --------+--+-------------�--�-
Ruhoff Ar6a:�14-730 at -
10
w--+-+--+--+--+--+--+-------+--+--+--+--r--+koi_ -+--+--+--+--+--
9 - 1--L-- -- 1--1-- --Runoff De-p#h:;1J51L
7
--r----+--+--+--r--r-------+--+--+--+--r- _- - -i +- + r- r--
6 -'- ----1--L--L--1---1---1--J--1--1--+--L----'---I q— �19-M'�--
s - - -- -- - - -- -- -- - - -- ---4�N=6&-
4
--r-
--- -- -- ------------ -- -- -- -- --------- -- -- -- -- --
3 ------+--+--+--+---------+--+--+--+--+--+-------+--+--+--+--+--
2
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 21
Hydrograph for Subcatchment 19S: UNDETAINED POST TO OUTFALL 2
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.00
6.00
0.40
0.00
0.00
7.00
0.49
0.00
0.00
8.00
0.60
0.00
0.00
9.00
0.73
0.00
0.00
10.00
0.90
0.00
0.00
11.00
1.17
0.00
0.00
12.00
3.29
0.37
6.47
13.00
3.83
0.59
2.58
14.00
4.07
0.70
1.47
15.00
4.23
0.77
1.13
16.00
4.36
0.84
0.91
17.00
4.47
0.89
0.78
18.00
4.57
0.94
0.71
19.00
4.65
0.98
0.62
20.00
4.72
1.02
0.53
21.00
4.79
1.05
0.49
22.00
4.85
1.09
0.48
23.00
4.90
1.12
0.46
24.00
4.96
1.15
0.45
25.00
4.96
1.15
0.00
26.00
4.96
1.15
0.00
27.00
4.96
1.15
0.00
28.00
4.96
1.15
0.00
29.00
4.96
1.15
0.00
30.00
4.96
1.15
0.00
31.00
4.96
1.15
0.00
32.00
4.96
1.15
0.00
33.00
4.96
1.15
0.00
34.00
4.96
1.15
0.00
35.00
4.96
1.15
0.00
36.00
4.96
1.15
0.00
37.00
4.96
1.15
0.00
38.00
4.96
1.15
0.00
39.00
4.96
1.15
0.00
40.00
4.96
1.15
0.00
41.00
4.96
1.15
0.00
42.00
4.96
1.15
0.00
43.00
4.96
1.15
0.00
44.00
4.96
1.15
0.00
45.00
4.96
1.15
0.00
46.00
4.96
1.15
0.00
47.00
4.96
1.15
0.00
48.00
4.96
1.15
0.00
49.00
4.96
1.15
0.00
50.00
4.96
1.15
0.00
51.00
4.96
1.15
0.00
52.00
4.96
1.15
0.00
53.00
4.96
1.15
0.00
54.00
4.96
1.15
0.00
55.00
4.96
1.15
0.00
56.00
4.96
1.15
0.00
57.00
4.96
1.15
0.00
58.00
4.96
1.15
0.00
59.00
4.96
1.15
0.00
60.00
4.96
1.15
0.00
61.00
4.96
1.15
0.00
62.00
4.96
1.15
0.00
63.00
4.96
1.15
0.00
64.00
4.96
1.15
0.00
65.00
4.96
1.15
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
1.15
0.00
67.00
4.96
1.15
0.00
68.00
4.96
1.15
0.00
69.00
4.96
1.15
0.00
70.00
4.96
1.15
0.00
71.00
4.96
1.15
0.00
72.00
4.96
1.15
0.00
73.00
4.96
1.15
0.00
74.00
4.96
1.15
0.00
75.00
4.96
1.15
0.00
76.00
4.96
1.15
0.00
77.00
4.96
1.15
0.00
78.00
4.96
1.15
0.00
79.00
4.96
1.15
0.00
80.00
4.96
1.15
0.00
81.00
4.96
1.15
0.00
82.00
4.96
1.15
0.00
83.00
4.96
1.15
0.00
84.00
4.96
1.15
0.00
85.00
4.96
1.15
0.00
86.00
4.96
1.15
0.00
87.00
4.96
1.15
0.00
88.00
4.96
1.15
0.00
89.00
4.96
1.15
0.00
90.00
4.96
1.15
0.00
91.00
4.96
1.15
0.00
92.00
4.96
1.15
0.00
93.00
4.96
1.15
0.00
94.00
4.96
1.15
0.00
95.00
4.96
1.15
0.00
96.00
4.96
1.15
0.00
97.00
4.96
1.15
0.00
98.00
4.96
1.15
0.00
99.00
4.96
1.15
0.00
100.00
4.96
1.15
0.00
101.00
4.96
1.15
0.00
102.00
4.96
1.15
0.00
103.00
4.96
1.15
0.00
104.00
4.96
1.15
0.00
105.00
4.96
1.15
0.00
106.00
4.96
1.15
0.00
107.00
4.96
1.15
0.00
108.00
4.96
1.15
0.00
109.00
4.96
1.15
0.00
110.00
4.96
1.15
0.00
111.00
4.96
1.15
0.00
112.00
4.96
1.15
0.00
113.00
4.96
1.15
0.00
114.00
4.96
1.15
0.00
115.00
4.96
1.15
0.00
116.00
4.96
1.15
0.00
117.00
4.96
1.15
0.00
118.00
4.96
1.15
0.00
119.00
4.96
1.15
0.00
120.00
4.96
1.15
0.00

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 22
Summary for Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Runoff = 4.20 cfs @ 12.17 hrs, Volume= 0.381 af, Depth= 1.21"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr-24hr Rainfall=4.96"
Area (ac)
CN
Description
3.190
55
Woods, Good, HSG B
0.580
78
Row crops, straight row, Good, HSG B
3.770
59
Weighted Average
3.770
100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
3.1
30
0.0280
0.16
Sheet Flow,
Grass: Short n= 0.150 P2= 3.50"
3.7
388
0.0620
1.74
Shallow Concentrated Flow,
Short Grass Pasture Kv= 7.0 fps
15.1
744
0.0270
0.82
Shallow Concentrated Flow,
Woodland Kv= 5.0 fos
21.9 1,162 Total
Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Hydrograph
� � � � � � � �� � � � � �� �� �� �� �� �� � � � � � ■Runoff
4.20 cfs
----
10yr-r24hr R;ainfaill:;4.96'.
RUn6ffAlrea=3.770 at
--r -i--r--r--r--r--i---i--r--r--t--r--r--r--i---i--r--r--r--r--i---i--
3 R4npff',VQ14m�e=0.$81 calf
Ru��noff'DepthT1.21';..
LL --+-- --' -- ----------F16w't6in9th=�1;1ST-
0
2
Tq=�1.�9 mill
ON=59
� LI
I I I I I I I I I I I I I I I I I I I
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 23
Hydrograph for Subcatchment 20S: UNDETAINED POST TO OUTFALL 3
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.17
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.31
0.00
0.00
6.00
0.40
0.00
0.00
7.00
0.49
0.00
0.00
8.00
0.60
0.00
0.00
9.00
0.73
0.00
0.00
10.00
0.90
0.00
0.00
11.00
1.17
0.00
0.00
12.00
3.29
0.41
1.87
13.00
3.83
0.63
0.69
14.00
4.07
0.74
0.39
15.00
4.23
0.83
0.30
16.00
4.36
0.89
0.24
17.00
4.47
0.95
0.21
18.00
4.57
1.00
0.19
19.00
4.65
1.04
0.16
20.00
4.72
1.08
0.14
21.00
4.79
1.11
0.13
22.00
4.85
1.15
0.13
23.00
4.90
1.18
0.12
24.00
4.96
1.21
0.12
25.00
4.96
1.21
0.00
26.00
4.96
1.21
0.00
27.00
4.96
1.21
0.00
28.00
4.96
1.21
0.00
29.00
4.96
1.21
0.00
30.00
4.96
1.21
0.00
31.00
4.96
1.21
0.00
32.00
4.96
1.21
0.00
33.00
4.96
1.21
0.00
34.00
4.96
1.21
0.00
35.00
4.96
1.21
0.00
36.00
4.96
1.21
0.00
37.00
4.96
1.21
0.00
38.00
4.96
1.21
0.00
39.00
4.96
1.21
0.00
40.00
4.96
1.21
0.00
41.00
4.96
1.21
0.00
42.00
4.96
1.21
0.00
43.00
4.96
1.21
0.00
44.00
4.96
1.21
0.00
45.00
4.96
1.21
0.00
46.00
4.96
1.21
0.00
47.00
4.96
1.21
0.00
48.00
4.96
1.21
0.00
49.00
4.96
1.21
0.00
50.00
4.96
1.21
0.00
51.00
4.96
1.21
0.00
52.00
4.96
1.21
0.00
53.00
4.96
1.21
0.00
54.00
4.96
1.21
0.00
55.00
4.96
1.21
0.00
56.00
4.96
1.21
0.00
57.00
4.96
1.21
0.00
58.00
4.96
1.21
0.00
59.00
4.96
1.21
0.00
60.00
4.96
1.21
0.00
61.00
4.96
1.21
0.00
62.00
4.96
1.21
0.00
63.00
4.96
1.21
0.00
64.00
4.96
1.21
0.00
65.00
4.96
1.21
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
66.00
4.96
1.21
0.00
67.00
4.96
1.21
0.00
68.00
4.96
1.21
0.00
69.00
4.96
1.21
0.00
70.00
4.96
1.21
0.00
71.00
4.96
1.21
0.00
72.00
4.96
1.21
0.00
73.00
4.96
1.21
0.00
74.00
4.96
1.21
0.00
75.00
4.96
1.21
0.00
76.00
4.96
1.21
0.00
77.00
4.96
1.21
0.00
78.00
4.96
1.21
0.00
79.00
4.96
1.21
0.00
80.00
4.96
1.21
0.00
81.00
4.96
1.21
0.00
82.00
4.96
1.21
0.00
83.00
4.96
1.21
0.00
84.00
4.96
1.21
0.00
85.00
4.96
1.21
0.00
86.00
4.96
1.21
0.00
87.00
4.96
1.21
0.00
88.00
4.96
1.21
0.00
89.00
4.96
1.21
0.00
90.00
4.96
1.21
0.00
91.00
4.96
1.21
0.00
92.00
4.96
1.21
0.00
93.00
4.96
1.21
0.00
94.00
4.96
1.21
0.00
95.00
4.96
1.21
0.00
96.00
4.96
1.21
0.00
97.00
4.96
1.21
0.00
98.00
4.96
1.21
0.00
99.00
4.96
1.21
0.00
100.00
4.96
1.21
0.00
101.00
4.96
1.21
0.00
102.00
4.96
1.21
0.00
103.00
4.96
1.21
0.00
104.00
4.96
1.21
0.00
105.00
4.96
1.21
0.00
106.00
4.96
1.21
0.00
107.00
4.96
1.21
0.00
108.00
4.96
1.21
0.00
109.00
4.96
1.21
0.00
110.00
4.96
1.21
0.00
111.00
4.96
1.21
0.00
112.00
4.96
1.21
0.00
113.00
4.96
1.21
0.00
114.00
4.96
1.21
0.00
115.00
4.96
1.21
0.00
116.00
4.96
1.21
0.00
117.00
4.96
1.21
0.00
118.00
4.96
1.21
0.00
119.00
4.96
1.21
0.00
120.00
4.96
1.21
0.00

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 24
Summary for Pond 2P: POND 2
Inflow Area = 27.080 ac, 79.03% Impervious, Inflow Depth = 3.84" for 10yr-24hr event
Inflow = 174.81 cfs @ 11.95 hrs, Volume= 8.661 of
Outflow = 31.89 cfs @ 12.13 hrs, Volume= 8.649 af, Atten= 82%, Lag= 10.5 min
Primary = 31.89 cfs @ 12.13 hrs, Volume= 8.649 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 717.10' @ 12.13 hrs Surf.Area= 34,229 sf Storage= 192,675 cf
Plug -Flow detention time= 485.8 min calculated for 8.649 of (100% of inflow)
Center -of -Mass det. time= 484.8 min ( 1,271.7 - 786.8 )
Volume Invert
Avail.Storage Storage Description
#1 710.00'
301,329 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
710.00
20,568
0 0
711.00
22,310
21,439 21,439
712.00
24,113
23,212 44,651
713.00
25,975
25,044 69,695
714.00
27,897
26,936 96,631
715.00
29,879
28,888 125,519
716.00
31,920
30,900 156,418
717.00
34,021
32,971 189,389
718.00
36,183
35,102 224,491
719.00
38,404
37,294 261,784
720.00
40,686
39,545 301,329
Device Routing
Invert
Outlet Devices
#1 Primary
709.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 709.39' / 709.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
710.00'
6.0" Vert. 6" Orifice C= 0.600
#3 Device 1
715.00'
36.0" W x 6.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1
718.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
718.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=31.85 cfs @ 12.13 hrs HW=717.09' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 31.85 cfs of 39.16 cfs potential flow)
2=6" Orifice (Orifice Controls 2.47 cfs @ 12.59 fps)
3=Orifice/Grate (Orifice Controls 29.38 cfs @ 6.53 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=710.00' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 25
Hydrograph
- , - -I - 7 -
' 174.81 cfs
- F - -
I I
- r
I
- 7 - - r
I_-�
- - - F
--I--I--
- , - -I - 7 - - F - - - r - -I- - r - - - F - , - - T - 7 - -
�--I---I--I---I--I-----------------I--
utflow
- 70o0at
L D
IMInflow
imary
190
I. ,
condary
180
7�
_ lrel�lq e_AL-IJ_ lT J {l _
170
160
-1-
--r-
--r-
--r-
--r-1----
JLOPae='19L,-66 df7 C'1
--r-�--r- -r-1--r 1-
150
-II--III - -II--III --II--III - -II--III - II --III --I--
140
I
130
- -
J--L-J--L-1--L-J--L-
--I-- -- - -- --I-- - -- - --L- -
120--r-y--Ir-y--Ir-y--Ir-y--Ir----r-y--Ir-y--r-y--
w 110
u
- �I-
-II--II---II--II--
�I--II---II--II--
�I--II---II--II---II--II---II--II---II--II-- �I--II---II--
' 100__I--
0
90
LL 80
-�-
�--Ir-�--Ir-�--r-�--Ir-�--Ir-�--Ir-�--Ir--Ii--r-�--Ir-�--r-�--
70
60
50
31.89 cfs
-
--I
J
-I�-I--
- --I
I�
----�I--I�---I�-�I--I�-�I--I�----�I--I�---�---
- --
- --I
- --II-- --I - --I --II-- - --I - -- - -
40
30
0.00
cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 2P: POND 2
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
710.00
0.00
0.00
0.00
2.50
0.00
0
710.00
0.00
0.00
0.00
5.00
0.29
581
710.03
0.00
0.00
0.00
7.50
1.10
6,081
710.29
0.22
0.22
0.00
10.00
3.18
19,170
710.90
0.76
0.76
0.00
12.50
13.30
177,892
716.66
28.07
28.07
0.00
15.00
3.94
131,136
715.19
4.43
4.43
0.00
17.50
2.52
127,943
715.08
2.74
2.74
0.00
20.00
1.72
125,641
715.00
2.07
2.07
0.00
22.50
1.54
121,765
714.87
2.03
2.03
0.00
25.00
0.00
112,133
714.55
1.96
1.96
0.00
27.50
0.00
95,132
713.95
1.82
1.82
0.00
30.00
0.00
79,433
713.37
1.67
1.67
0.00
32.50
0.00
65,092
712.82
1.52
1.52
0.00
35.00
0.00
52,162
712.31
1.36
1.36
0.00
37.50
0.00
40,698
711.84
1.19
1.19
0.00
40.00
0.00
30,754
711.41
1.02
1.02
0.00
42.50
0.00
22,380
711.04
0.84
0.84
0.00
45.00
0.00
15,623
710.74
0.66
0.66
0.00
47.50
0.00
10,521
710.50
0.47
0.47
0.00
50.00
0.00
7,119
710.34
0.28
0.28
0.00
52.50
0.00
5,158
710.25
0.16
0.16
0.00
55.00
0.00
3,979
710.19
0.10
0.10
0.00
57.50
0.00
3,214
710.16
0.07
0.07
0.00
60.00
0.00
2,684
710.13
0.05
0.05
0.00
62.50
0.00
2,298
710.11
0.04
0.04
0.00
65.00
0.00
2,007
710.10
0.03
0.03
0.00
67.50
0.00
1,778
710.09
0.02
0.02
0.00
70.00
0.00
1,596
710.08
0.02
0.02
0.00
72.50
0.00
1,446
710.07
0.02
0.02
0.00
75.00
0.00
1,322
710.06
0.01
0.01
0.00
77.50
0.00
1,217
710.06
0.01
0.01
0.00
80.00
0.00
1,127
710.05
0.01
0.01
0.00
82.50
0.00
1,049
710.05
0.01
0.01
0.00
85.00
0.00
981
710.05
0.01
0.01
0.00
87.50
0.00
921
710.04
0.01
0.01
0.00
90.00
0.00
868
710.04
0.01
0.01
0.00
92.50
0.00
821
710.04
0.00
0.00
0.00
95.00
0.00
779
710.04
0.00
0.00
0.00
97.50
0.00
740
710.04
0.00
0.00
0.00
100.00
0.00
705
710.03
0.00
0.00
0.00
102.50
0.00
674
710.03
0.00
0.00
0.00
105.00
0.00
645
710.03
0.00
0.00
0.00
107.50
0.00
618
710.03
0.00
0.00
0.00
110.00
0.00
593
710.03
0.00
0.00
0.00
112.50
0.00
571
710.03
0.00
0.00
0.00
115.00
0.00
550
710.03
0.00
0.00
0.00
117.50
0.00
530
710.03
0.00
0.00
0.00
120.00
0.00
512
710.02
0.00
0.00
0.00
Type 1124-hr 10yr-24hr Rainfall=4.96"
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 27
Stage -Discharge for Pond 2P: POND 2
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
710.00
0.00
0.00
0.00
710.10
0.03
0.03
0.00
710.20
0.11
0.11
0.00
710.30
0.23
0.23
0.00
710.40
0.36
0.36
0.00
710.50
0.47
0.47
0.00
710.60
0.56
0.56
0.00
710.70
0.63
0.63
0.00
710.80
0.70
0.70
0.00
710.90
0.76
0.76
0.00
711.00
0.82
0.82
0.00
711.10
0.87
0.87
0.00
711.20
0.92
0.92
0.00
711.30
0.97
0.97
0.00
711.40
1.01
1.01
0.00
711.50
1.06
1.06
0.00
711.60
1.10
1.10
0.00
711.70
1.14
1.14
0.00
711.80
1.18
1.18
0.00
711.90
1.21
1.21
0.00
712.00
1.25
1.25
0.00
712.10
1.29
1.29
0.00
712.20
1.32
1.32
0.00
712.30
1.35
1.35
0.00
712.40
1.39
1.39
0.00
712.50
1.42
1.42
0.00
712.60
1.45
1.45
0.00
712.70
1.48
1.48
0.00
712.80
1.51
1.51
0.00
712.90
1.54
1.54
0.00
713.00
1.57
1.57
0.00
713.10
1.60
1.60
0.00
713.20
1.62
1.62
0.00
713.30
1.65
1.65
0.00
713.40
1.68
1.68
0.00
713.50
1.70
1.70
0.00
713.60
1.73
1.73
0.00
713.70
1.76
1.76
0.00
713.80
1.78
1.78
0.00
713.90
1.81
1.81
0.00
714.00
1.83
1.83
0.00
714.10
1.86
1.86
0.00
714.20
1.88
1.88
0.00
714.30
1.90
1.90
0.00
714.40
1.93
1.93
0.00
714.50
1.95
1.95
0.00
714.60
1.97
1.97
0.00
714.70
1.99
1.99
0.00
714.80
2.02
2.02
0.00
714.90
2.04
2.04
0.00
715.00
2.06
2.06
0.00
715.10
3.00
3.00
0.00
715.20
4.69
4.69
0.00
715.30
6.87
6.87
0.00
715.40
9.45
9.45
0.00
715.50
12.38
12.38
0.00
715.60
14.70
14.70
0.00
715.70
16.54
16.54
0.00
715.80
18.15
18.15
0.00
715.90
19.61
19.61
0.00
716.00
20.94
20.94
0.00
716.10
22.19
22.19
0.00
716.20
23.36
23.36
0.00
716.30
24.47
24.47
0.00
716.40
25.53
25.53
0.00
716.50
26.55
26.55
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
716.60
27.52
27.52
0.00
716.70
28.46
28.46
0.00
716.80
29.37
29.37
0.00
716.90
30.24
30.24
0.00
717.00
31.10
31.10
0.00
717.10
31.92
31.92
0.00
717.20
32.73
32.73
0.00
717.30
33.51
33.51
0.00
717.40
34.28
34.28
0.00
717.50
35.03
35.03
0.00
717.60
35.76
35.76
0.00
717.70
36.48
36.48
0.00
717.80
37.18
37.18
0.00
717.90
37.87
37.87
0.00
718.00
38.55
38.55
0.00
718.10
40.87
40.87
0.00
718.20
42.27
42.27
0.00
718.30
42.54
42.54
0.00
718.40
42.81
42.81
0.00
718.50
43.08
43.08
0.00
718.60
44.13
43.34
0.79
718.70
45.83
43.61
2.23
718.80
48.02
43.87
4.15
718.90
50.60
44.13
6.48
719.00
53.68
44.39
9.30
719.10
57.19
44.64
12.55
719.20
60.68
44.90
15.78
719.30
64.40
45.15
19.25
719.40
68.33
45.41
22.92
719.50
72.46
45.66
26.80
719.60
76.88
45.91
30.98
719.70
81.52
46.16
35.36
719.80
86.13
46.40
39.72
719.90
90.88
46.65
44.23
720.00
95.67
46.89
48.78

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 28
Stage -Area -Storage for Pond 2P: POND 2
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
710.00
20,568
0
710.10
20,742
2,066
710.20
20,916
4,148
710.30
21,091
6,249
710.40
21,265
8,367
710.50
21,439
10,502
710.60
21,613
12,654
710.70
21,787
14,824
710.80
21,962
17,012
710.90
22,136
19,217
711.00
22,310
21,439
711.10
22,490
23,679
711.20
22,671
25,937
711.30
22,851
28,213
711.40
23,031
30,507
711.50
23,212
32,819
711.60
23,392
35,150
711.70
23,572
37,498
711.80
23,752
39,864
711.90
23,933
42,248
712.00
24,113
44,651
712.10
24,299
47,071
712.20
24,485
49,510
712.30
24,672
51,968
712.40
24,858
54,445
712.50
25,044
56,940
712.60
25,230
59,453
712.70
25,416
61,986
712.80
25,603
64,537
712.90
25,789
67,106
713.00
25,975
69,695
713.10
26,167
72,302
713.20
26,359
74,928
713.30
26,552
77,573
713.40
26,744
80,238
713.50
26,936
82,922
713.60
27,128
85,625
713.70
27,320
88,348
713.80
27,513
91,090
713.90
27,705
93,850
714.00
27,897
96,631
714.10
28,095
99,430
714.20
28,293
102,250
714.30
28,492
105,089
714.40
28,690
107,948
714.50
28,888
110,827
714.60
29,086
113,725
714.70
29,284
116,644
714.80
29,483
119,582
714.90
29,681
122,541
715.00
29,879
125,519
715.10
30,083
128,517
715.20
30,287
131,535
715.30
30,491
134,574
715.40
30,695
137,633
715.50
30,900
140,713
715.60
31,104
143,813
715.70
31,308
146,934
715.80
31,512
150,075
715.90
31,716
153,236
716.00
31,920
156,418
716.10
32,130
159,621
716.20
32,340
162,844
716.30
32,550
166,089
716.40
32,760
169,354
716.50
32.971
172.641
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
716.60
33,181
175,948
716.70
33,391
179,277
716.80
33,601
182,626
716.90
33,811
185,997
717.00
34,021
189,389
717.10
34,237
192,801
717.20
34,453
196,236
717.30
34,670
199,692
717.40
34,886
203,170
717.50
35,102
206,669
717.60
35,318
210,190
717.70
35,534
213,733
717.80
35,751
217,297
717.90
35,967
220,883
718.00
36,183
224,491
718.10
36,405
228,120
718.20
36,627
231,772
718.30
36,849
235,445
718.40
37,071
239,141
718.50
37,294
242,860
718.60
37,516
246,600
718.70
37,738
250,363
718.80
37,960
254,148
718.90
38,182
257,955
719.00
38,404
261,784
719.10
38,632
265,636
719.20
38,860
269,510
719.30
39,089
273,408
719.40
39,317
277,328
719.50
39,545
281,271
719.60
39,773
285,237
719.70
40,001
289,226
719.80
40,230
293,237
719.90
40,458
297,272
720.00
40,686
301,329

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 29
Summary for Pond 8P: POND 3
Inflow Area = 15.260 ac, 72.15% Impervious, Inflow Depth = 3.63" for 10yr-24hr event
Inflow = 94.73 cfs @ 11.95 hrs, Volume= 4.617 of
Outflow = 2.55 cfs @ 14.24 hrs, Volume= 4.578 af, Atten= 97%, Lag= 137.1 min
Primary = 2.55 cfs @ 14.24 hrs, Volume= 4.578 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 704.63' @ 14.24 hrs Surf.Area= 55,974 sf Storage= 131,202 cf
Plug -Flow detention time= 729.4 min calculated for 4.578 of (99% of inflow)
Center -of -Mass det. time= 724.0 min ( 1,518.1 - 794.1 )
Volume Invert
Avail.Storage Storage Description
#1 702.00'
503,002 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
702.00
43,792
0 0
703.00
48,320
46,056 46,056
704.00
52,961
50,641 96,697
705.00
57,717
55,339 152,036
706.00
62,582
60,150 212,185
707.00
67,552
65,067 277,252
708.00
72,628
70,090 347,342
709.00
77,809
75,219 422,561
710.00
83,074
80,442 503,002
Device Routing
Invert
Outlet Devices
#1 Primary
701.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 701.39' / 701.00' S= 0.0050 T Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
702.00'
8.0" Vert. 8" Orifice C= 0.600
#3 Device 1
705.00'
36.0" W x 6.0" H Vert. Orifice/Grate X 2.00 C= 0.600
#4 Device 1
708.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
708.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=2.55 cfs @ 14.24 hrs HW=704.63' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 2.55 cfs of 21.10 cfs potential flow)
2=8" Orifice (Orifice Controls 2.55 cfs @ 7.30 fps)
3=Orifice/Grate ( Controls 0.00 cfs)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=702.00' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 30
'1.71 E:iA1O]isDS]
Hydrograph
- --
CfS
L-L--L-L--L-L--L-
- -,--,
- --,
--,--,
-----
----L--L-L--L--'--
-,--,
--,--, ---- , --,--, - --, --,-_
-L--L- --L-L-
IN Inflow
IN Outflow
- -
--r-
--r-
--r-
--r-
--r
r r r
----- b`O a_ _
IN Primary
105
- -
---
-
---- -
--- -
----;
- --;
-lnflorware
■Secondary
100-
95
90
- -
---
--
--- --
--
- --- --
--------
ra e-.431202��-
85
-1-
--r-
--r-
--r-
--r-1--i--
--r
--r --
80
-
-
-
-
75
- -
--
- --
- --
- --
- ----
--
- -- ---- - -- - -- - --
70
- -
--
- --
- --r-
--
- --
- --
- -- ----r- -- - --r- --
65
w 60
-1-
--r-
--r-
--r-
--r-1--i--
--r-
--r--i--r---r-1--r- --
!' 55
- -
---
- ----
--
- --
--------
-------- - -- - -- ----
3 50
- -
--
- --
- --
- --
- ----
--
- -- ---- - -- - -- - --
M 45
- -
7--Ir-
--Ir-
--r-
--Ir-
--Ir-7--Ir-
--Ir--li--r- --Ir---r-7--
40
- -
-
-
-
-
-
- - - - - -
35
- -
--
- --
- --
- --
- ----
--
- -- ---- - -- - -- - --
30
-
-
-
-
25
-L-
L--L-L--L-L--L-L--L-L--'--L--L-L--L--'--L-L--L-L--L-L--
20
15
2.:) cfs
0.00
Cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 8P: POND 3
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
702.00
0.00
0.00
0.00
2.50
0.00
0
702.00
0.00
0.00
0.00
5.00
0.06
45
702.00
0.00
0.00
0.00
7.50
0.47
2,305
702.05
0.01
0.01
0.00
10.00
1.55
9,884
702.22
0.16
0.16
0.00
12.50
7.31
122,001
704.47
2.46
2.46
0.00
15.00
2.18
130,698
704.62
2.54
2.54
0.00
17.50
1.40
123,297
704.49
2.47
2.47
0.00
20.00
0.95
112,151
704.29
2.35
2.35
0.00
22.50
0.85
99,713
704.06
2.21
2.21
0.00
25.00
0.00
85,263
703.78
2.02
2.02
0.00
27.50
0.00
68,169
703.45
1.77
1.77
0.00
30.00
0.00
53,345
703.15
1.52
1.52
0.00
32.50
0.00
40,854
702.89
1.26
1.26
0.00
35.00
0.00
30,754
702.68
0.99
0.99
0.00
37.50
0.00
23,095
702.51
0.70
0.70
0.00
40.00
0.00
17,880
702.40
0.47
0.47
0.00
42.50
0.00
14,358
702.32
0.32
0.32
0.00
45.00
0.00
11,893
702.27
0.23
0.23
0.00
47.50
0.00
10,100
702.23
0.17
0.17
0.00
50.00
0.00
8,749
702.20
0.13
0.13
0.00
52.50
0.00
7,701
702.17
0.10
0.10
0.00
55.00
0.00
6,867
702.16
0.08
0.08
0.00
57.50
0.00
6,189
702.14
0.07
0.07
0.00
60.00
0.00
5,629
702.13
0.06
0.06
0.00
62.50
0.00
5,158
702.12
0.05
0.05
0.00
65.00
0.00
4,758
702.11
0.04
0.04
0.00
67.50
0.00
4,414
702.10
0.04
0.04
0.00
70.00
0.00
4,115
702.09
0.03
0.03
0.00
72.50
0.00
3,854
702.09
0.03
0.03
0.00
75.00
0.00
3,622
702.08
0.02
0.02
0.00
77.50
0.00
3,417
702.08
0.02
0.02
0.00
80.00
0.00
3,233
702.07
0.02
0.02
0.00
82.50
0.00
3,067
702.07
0.02
0.02
0.00
85.00
0.00
2,917
702.07
0.02
0.02
0.00
87.50
0.00
2,781
702.06
0.01
0.01
0.00
90.00
0.00
2,657
702.06
0.01
0.01
0.00
92.50
0.00
2,543
702.06
0.01
0.01
0.00
95.00
0.00
2,439
702.06
0.01
0.01
0.00
97.50
0.00
2,343
702.05
0.01
0.01
0.00
100.00
0.00
2,253
702.05
0.01
0.01
0.00
102.50
0.00
2,171
702.05
0.01
0.01
0.00
105.00
0.00
2,094
702.05
0.01
0.01
0.00
107.50
0.00
2,022
702.05
0.01
0.01
0.00
110.00
0.00
1,955
702.04
0.01
0.01
0.00
112.50
0.00
1,892
702.04
0.01
0.01
0.00
115.00
0.00
1,833
702.04
0.01
0.01
0.00
117.50
0.00
1,778
702.04
0.01
0.01
0.00
120.00
0.00
1,726
702.04
0.01
0.01
0.00
Type 1124-hr 10yr-24hr Rainfall=4.96"
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 32
Stage -Discharge for Pond 8P: POND 3
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
702.00
0.00
0.00
0.00
702.10
0.04
0.04
0.00
702.20
0.13
0.13
0.00
702.30
0.28
0.28
0.00
702.40
0.47
0.47
0.00
702.50
0.68
0.68
0.00
702.60
0.87
0.87
0.00
702.70
1.02
1.02
0.00
702.80
1.15
1.15
0.00
702.90
1.27
1.27
0.00
703.00
1.37
1.37
0.00
703.10
1.47
1.47
0.00
703.20
1.56
1.56
0.00
703.30
1.65
1.65
0.00
703.40
1.74
1.74
0.00
703.50
1.82
1.82
0.00
703.60
1.89
1.89
0.00
703.70
1.96
1.96
0.00
703.80
2.04
2.04
0.00
703.90
2.10
2.10
0.00
704.00
2.17
2.17
0.00
704.10
2.23
2.23
0.00
704.20
2.30
2.30
0.00
704.30
2.36
2.36
0.00
704.40
2.42
2.42
0.00
704.50
2.47
2.47
0.00
704.60
2.53
2.53
0.00
704.70
2.59
2.59
0.00
704.80
2.64
2.64
0.00
704.90
2.69
2.69
0.00
705.00
2.74
2.74
0.00
705.10
3.40
3.40
0.00
705.20
4.57
4.57
0.00
705.30
6.06
6.06
0.00
705.40
7.82
7.82
0.00
705.50
9.80
9.80
0.00
705.60
11.38
11.38
0.00
705.70
12.64
12.64
0.00
705.80
13.75
13.75
0.00
705.90
14.75
14.75
0.00
706.00
15.67
15.67
0.00
706.10
16.53
16.53
0.00
706.20
17.34
17.34
0.00
706.30
18.11
18.11
0.00
706.40
18.85
18.85
0.00
706.50
19.55
19.55
0.00
706.60
20.23
20.23
0.00
706.70
20.88
20.88
0.00
706.80
21.52
21.52
0.00
706.90
22.13
22.13
0.00
707.00
22.72
22.72
0.00
707.10
23.30
23.30
0.00
707.20
23.87
23.87
0.00
707.30
24.41
24.41
0.00
707.40
24.95
24.95
0.00
707.50
25.48
25.48
0.00
707.60
25.99
25.99
0.00
707.70
26.49
26.49
0.00
707.80
26.99
26.99
0.00
707.90
27.47
27.47
0.00
708.00
27.95
27.95
0.00
708.10
30.07
30.07
0.00
708.20
33.55
33.55
0.00
708.30
36.77
36.77
0.00
708.40
37.08
37.08
0.00
708.50
37.39
37.39
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
708.60
38.48
37.70
0.79
708.70
40.22
38.00
2.23
708.80
42.45
38.30
4.15
708.90
45.07
38.60
6.48
709.00
48.19
38.89
9.30
709.10
51.73
39.18
12.55
709.20
55.26
39.47
15.78
709.30
59.01
39.76
19.25
709.40
62.97
40.05
22.92
709.50
67.13
40.33
26.80
709.60
71.59
40.62
30.98
709.70
76.26
40.90
35.36
709.80
80.90
41.18
39.72
709.90
85.68
41.45
44.23
710.00
90.50
41.73
48.78

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 33
Stage -Area -Storage for Pond 8P: POND 3
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
702.00
43,792
0
702.10
44,245
4,402
702.20
44,698
8,849
702.30
45,150
13,341
702.40
45,603
17,879
702.50
46,056
22,462
702.60
46,509
27,090
702.70
46,962
31,764
702.80
47,414
36,483
702.90
47,867
41,247
703.00
48,320
46,056
703.10
48,784
50,911
703.20
49,248
55,813
703.30
49,712
60,761
703.40
50,176
65,755
703.50
50,641
70,796
703.60
51,105
75,883
703.70
51,569
81,017
703.80
52,033
86,197
703.90
52,497
91,424
704.00
52,961
96,697
704.10
53,437
102,016
704.20
53,912
107,384
704.30
54,388
112,799
704.40
54,863
118,261
704.50
55,339
123,772
704.60
55,815
129,329
704.70
56,290
134,934
704.80
56,766
140,587
704.90
57,241
146,288
705.00
57,717
152,036
705.10
58,204
157,832
705.20
58,690
163,676
705.30
59,176
169,570
705.40
59,663
175,511
705.50
60,150
181,502
705.60
60,636
187,541
705.70
61,123
193,629
705.80
61,609
199,766
705.90
62,095
205,951
706.00
62,582
212,185
706.10
63,079
218,468
706.20
63,576
224,801
706.30
64,073
231,183
706.40
64,570
237,615
706.50
65,067
244,097
706.60
65,564
250,629
706.70
66,061
257,210
706.80
66,558
263,841
706.90
67,055
270,522
707.00
67,552
277,252
707.10
68,060
284,033
707.20
68,567
290,864
707.30
69,075
297,746
707.40
69,582
304,679
707.50
70,090
311,663
707.60
70,598
318,697
707.70
71,105
325,782
707.80
71,613
332,918
707.90
72,120
340,105
708.00
72,628
347,342
708.10
73,146
354,631
708.20
73,664
361,971
708.30
74,182
369,364
708.40
74,700
376,808
708.50
75.219
384.304
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
708.60
75,737
391,851
708.70
76,255
399,451
708.80
76,773
407,102
708.90
77,291
414,806
709.00
77,809
422,561
709.10
78,336
430,368
709.20
78,862
438,228
709.30
79,388
446,140
709.40
79,915
454,105
709.50
80,442
462,123
709.60
80,968
470,194
709.70
81,495
478,317
709.80
82,021
486,492
709.90
82,547
494,721
710.00
83,074
503,002

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 34
Summary for Pond 10P: POND 4
Inflow Area = 10.550 ac, 69.48% Impervious, Inflow Depth = 3.53" for 10yr-24hr event
Inflow = 64.12 cfs @ 11.95 hrs, Volume= 3.103 of
Outflow = 7.53 cfs @ 12.27 hrs, Volume= 3.103 af, Atten= 88%, Lag= 18.8 min
Primary = 7.53 cfs @ 12.27 hrs, Volume= 3.103 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 682.67' @ 12.27 hrs Surf.Area= 20,295 sf Storage= 62,288 cf
Plug -Flow detention time= 159.7 min calculated for 3.103 of (100% of inflow)
Center -of -Mass det. time= 159.1 min ( 956.6 - 797.5 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
120,639 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
4,560
0 0
678.00
5,909
5,235 5,235
679.00
7,780
6,845 12,079
680.00
10,667
9,224 21,303
681.00
14,076
12,372 33,674
682.00
17,710
15,893 49,567
683.00
21,571
19,641 69,208
684.00
25,659
23,615 92,823
685.00
29,973
27,816 120,639
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 T Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
677.00'
8.0" Vert. 8" Orifice C= 0.600
#3 Device 1
682.50'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#4 Secondary
683.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=7.51 cfs @ 12.27 hrs HW=682.67' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 7.51 cfs of 34.75 cfs potential flow)
2=8" Orifice (Orifice Controls 3.88 cfs @ 11.12 fps)
1
3=Top of OS (Weir Controls 3.63 cfs @ 1.34 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
4=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 35
'0=6 1 gi[1]A191MIX!
.....
I
1 1 1
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iiiiii

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 10P: POND 4
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.01
2
677.00
0.00
0.00
0.00
7.50
0.28
928
677.20
0.13
0.13
0.00
10.00
0.99
2,555
677.52
0.72
0.72
0.00
12.50
4.99
61,556
682.63
6.41
6.41
0.00
15.00
1.49
47,224
681.87
3.58
3.58
0.00
17.50
0.96
27,756
680.56
3.02
3.02
0.00
20.00
0.65
11,521
678.93
2.12
2.12
0.00
22.50
0.58
3,314
677.66
0.97
0.97
0.00
25.00
0.00
1,128
677.24
0.19
0.19
0.00
27.50
0.00
431
677.09
0.03
0.03
0.00
30.00
0.00
261
677.06
0.01
0.01
0.00
32.50
0.00
186
677.04
0.01
0.01
0.00
35.00
0.00
144
677.03
0.00
0.00
0.00
37.50
0.00
117
677.03
0.00
0.00
0.00
40.00
0.00
99
677.02
0.00
0.00
0.00
42.50
0.00
86
677.02
0.00
0.00
0.00
45.00
0.00
75
677.02
0.00
0.00
0.00
47.50
0.00
67
677.01
0.00
0.00
0.00
50.00
0.00
61
677.01
0.00
0.00
0.00
52.50
0.00
55
677.01
0.00
0.00
0.00
55.00
0.00
51
677.01
0.00
0.00
0.00
57.50
0.00
47
677.01
0.00
0.00
0.00
60.00
0.00
44
677.01
0.00
0.00
0.00
62.50
0.00
41
677.01
0.00
0.00
0.00
65.00
0.00
38
677.01
0.00
0.00
0.00
67.50
0.00
36
677.01
0.00
0.00
0.00
70.00
0.00
34
677.01
0.00
0.00
0.00
72.50
0.00
33
677.01
0.00
0.00
0.00
75.00
0.00
31
677.01
0.00
0.00
0.00
77.50
0.00
29
677.01
0.00
0.00
0.00
80.00
0.00
28
677.01
0.00
0.00
0.00
82.50
0.00
27
677.01
0.00
0.00
0.00
85.00
0.00
26
677.01
0.00
0.00
0.00
87.50
0.00
25
677.01
0.00
0.00
0.00
90.00
0.00
24
677.01
0.00
0.00
0.00
92.50
0.00
23
677.01
0.00
0.00
0.00
95.00
0.00
22
677.00
0.00
0.00
0.00
97.50
0.00
21
677.00
0.00
0.00
0.00
100.00
0.00
21
677.00
0.00
0.00
0.00
102.50
0.00
20
677.00
0.00
0.00
0.00
105.00
0.00
19
677.00
0.00
0.00
0.00
107.50
0.00
19
677.00
0.00
0.00
0.00
110.00
0.00
18
677.00
0.00
0.00
0.00
112.50
0.00
18
677.00
0.00
0.00
0.00
115.00
0.00
17
677.00
0.00
0.00
0.00
117.50
0.00
17
677.00
0.00
0.00
0.00
120.00
0.00
16
677.00
0.00
0.00
0.00
Type 1124-hr 10yr-24hr Rainfall=4.96"
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 37
Stage -Discharge for Pond 10P: POND 4
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.13
0.13
0.00
677.30
0.28
0.28
0.00
677.40
0.47
0.47
0.00
677.50
0.68
0.68
0.00
677.60
0.87
0.87
0.00
677.70
1.02
1.02
0.00
677.80
1.15
1.15
0.00
677.90
1.27
1.27
0.00
678.00
1.37
1.37
0.00
678.10
1.47
1.47
0.00
678.20
1.56
1.56
0.00
678.30
1.65
1.65
0.00
678.40
1.74
1.74
0.00
678.50
1.82
1.82
0.00
678.60
1.89
1.89
0.00
678.70
1.96
1.96
0.00
678.80
2.04
2.04
0.00
678.90
2.10
2.10
0.00
679.00
2.17
2.17
0.00
679.10
2.23
2.23
0.00
679.20
2.30
2.30
0.00
679.30
2.36
2.36
0.00
679.40
2.42
2.42
0.00
679.50
2.47
2.47
0.00
679.60
2.53
2.53
0.00
679.70
2.59
2.59
0.00
679.80
2.64
2.64
0.00
679.90
2.69
2.69
0.00
680.00
2.74
2.74
0.00
680.10
2.80
2.80
0.00
680.20
2.85
2.85
0.00
680.30
2.89
2.89
0.00
680.40
2.94
2.94
0.00
680.50
2.99
2.99
0.00
680.60
3.04
3.04
0.00
680.70
3.08
3.08
0.00
680.80
3.13
3.13
0.00
680.90
3.17
3.17
0.00
681.00
3.22
3.22
0.00
681.10
3.26
3.26
0.00
681.20
3.30
3.30
0.00
681.30
3.35
3.35
0.00
681.40
3.39
3.39
0.00
681.50
3.43
3.43
0.00
681.60
3.47
3.47
0.00
681.70
3.51
3.51
0.00
681.80
3.55
3.55
0.00
681.90
3.59
3.59
0.00
682.00
3.63
3.63
0.00
682.10
3.67
3.67
0.00
682.20
3.71
3.71
0.00
682.30
3.75
3.75
0.00
682.40
3.78
3.78
0.00
682.50
3.82
3.82
0.00
682.60
5.51
5.51
0.00
682.70
8.57
8.57
0.00
682.80
12.53
12.53
0.00
682.90
17.20
17.20
0.00
683.00
22.50
22.50
0.00
683.10
28.35
28.35
0.00
683.20
34.71
34.71
0.00
683.30
36.77
36.77
0.00
683.40
37.08
37.08
0.00
683.50
37.39
37.39
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
38.48
37.70
0.79
683.70
40.22
38.00
2.23
683.80
42.45
38.30
4.15
683.90
45.07
38.60
6.48
684.00
48.19
38.89
9.30
684.10
51.73
39.18
12.55
684.20
55.26
39.47
15.78
684.30
59.01
39.76
19.25
684.40
62.97
40.05
22.92
684.50
67.13
40.33
26.80
684.60
71.59
40.62
30.98
684.70
76.26
40.90
35.36
684.80
80.90
41.18
39.72
684.90
85.68
41.45
44.23
685.00
90.50
41.73
48.78

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 38
Stage -Area -Storage for Pond 10P: POND 4
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
4,560
0
677.10
4,695
463
677.20
4,830
939
677.30
4,965
1,429
677.40
5,100
1,932
677.50
5,235
2,449
677.60
5,369
2,979
677.70
5,504
3,523
677.80
5,639
4,080
677.90
5,774
4,650
678.00
5,909
5,235
678.10
6,096
5,835
678.20
6,283
6,454
678.30
6,470
7,091
678.40
6,657
7,748
678.50
6,845
8,423
678.60
7,032
9,117
678.70
7,219
9,829
678.80
7,406
10,560
678.90
7,593
11,310
679.00
7,780
12,079
679.10
8,069
12,871
679.20
8,357
13,693
679.30
8,646
14,543
679.40
8,935
15,422
679.50
9,224
16,330
679.60
9,512
17,267
679.70
9,801
18,232
679.80
10,090
19,227
679.90
10,378
20,250
680.00
10,667
21,303
680.10
11,008
22,386
680.20
11,349
23,504
680.30
11,690
24,656
680.40
12,031
25,842
680.50
12,372
27,062
680.60
12,712
28,316
680.70
13,053
29,605
680.80
13,394
30,927
680.90
13,735
32,283
681.00
14,076
33,674
681.10
14,439
35,100
681.20
14,803
36,562
681.30
15,166
38,060
681.40
15,530
39,595
681.50
15,893
41,166
681.60
16,256
42,774
681.70
16,620
44,418
681.80
16,983
46,098
681.90
17,347
47,814
682.00
17,710
49,567
682.10
18,096
51,357
682.20
18,482
53,186
682.30
18,868
55,054
682.40
19,254
56,960
682.50
19,641
58,905
682.60
20,027
60,888
682.70
20,413
62,910
682.80
20,799
64,971
682.90
21,185
67,070
683.00
21,571
69,208
683.10
21,980
71,385
683.20
22,389
73,603
683.30
22,797
75,863
683.40
23,206
78,163
683.50
23.615
80.504
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
24,024
82,886
683.70
24,433
85,309
683.80
24,841
87,772
683.90
25,250
90,277
684.00
25,659
92,823
684.10
26,090
95,410
684.20
26,522
98,041
684.30
26,953
100,714
684.40
27,385
103,431
684.50
27,816
106,191
684.60
28,247
108,994
684.70
28,679
111,841
684.80
29,110
114,730
684.90
29,542
117,663
685.00
29,973
120,639

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HVdroCAD Software Solutions LLC Pane 39
Summary for Pond 11 P: POST - OUTFALL #2
Inflow Area = 67.620 ac, 58.77% Impervious, Inflow Depth > 3.15" for 10yr-24hr event
Inflow = 56.40 cfs @ 12.18 hrs, Volume= 17.737 of
Primary = 56.40 cfs @ 12.18 hrs, Volume= 17.737 af, Men= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 11 P: POST - OUTFALL #2
Hydrograph
I I I-i I I I I I F T F -T F I I
I I I I I I I I I I I I I I I I I I I I
I I I I I I I I I I I I I I I I I I I I
60 56.40 cfs-------I----------I-- ----I f�0r�_7T6O -a- -
f.
- - ---'-- '-------------=-------------=----
55 �I I I I I I I I I I I I I I I I I I I I I I I
50--i---------i --i-----i--i --i---------i---------i --i --i--
45 --
40 -- --'i-----II-- -- li --'i-------'i --'i-------'i --'i-----'i-- --'i --'i --'i--
w 35 -- l--i-----I-- li-----i----------i-----I-- li--i-----I-- li--------I--
u
30 ----i-----II-- III--Ii --i --i---Ili--i --i---------i---------i --i --i--
LL I I I I I I I I I I I I I I I I I I I I
25 -- --------- --------- -- -- ---- -- --------- -- -- ----
20 t- t -
-- --------- --------- -- -- ---+---------'-- -- -
I I I I I I I I I I I I I I I I I I I I I I I
I I I I I I I I I I I I I I I I I I I I
15 - -------- --------- -- -- -t- --+---------'-- -- ----
I I I I I I I I I I I I I I I I I
5
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)
❑ Inflow
❑ Primary

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 40
Hydrograph for Pond 11 P: POST - OUTFALL #2
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.04
0.04
7.00
0.21
0.21
8.00
0.55
0.55
9.00
1.03
1.03
10.00
1.64
1.64
11.00
2.71
2.71
12.00
38.69
38.69
13.00
28.70
28.70
14.00
14.34
14.34
15.00
11.68
11.68
16.00
10.31
10.31
17.00
9.34
9.34
18.00
8.61
8.61
19.00
7.86
7.86
20.00
7.08
7.08
21.00
6.48
6.48
22.00
5.92
5.92
23.00
5.47
5.47
24.00
5.19
5.19
25.00
4.17
4.17
26.00
3.90
3.90
27.00
3.71
3.71
28.00
3.54
3.54
29.00
3.37
3.37
30.00
3.20
3.20
31.00
3.03
3.03
32.00
2.86
2.86
33.00
2.69
2.69
34.00
2.52
2.52
35.00
2.35
2.35
36.00
2.18
2.18
37.00
1.99
1.99
38.00
1.81
1.81
39.00
1.64
1.64
40.00
1.49
1.49
41.00
1.35
1.35
42.00
1.23
1.23
43.00
1.11
1.11
44.00
1.00
1.00
45.00
0.89
0.89
46.00
0.79
0.79
47.00
0.69
0.69
48.00
0.60
0.60
49.00
0.50
0.50
50.00
0.42
0.42
51.00
0.35
0.35
52.00
0.29
0.29
53.00
0.25
0.25
54.00
0.21
0.21
55.00
0.19
0.19
56.00
0.16
0.16
57.00
0.15
0.15
58.00
0.13
0.13
59.00
0.12
0.12
60.00
0.11
0.11
61.00
0.10
0.10
62.00
0.09
0.09
63.00
0.08
0.08
64.00
0.08
0.08
65.00
0.07
0.07
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.06
0.06
67.00
0.06
0.06
68.00
0.06
0.06
69.00
0.05
0.05
70.00
0.05
0.05
71.00
0.05
0.05
72.00
0.04
0.04
73.00
0.04
0.04
74.00
0.04
0.04
75.00
0.04
0.04
76.00
0.04
0.04
77.00
0.03
0.03
78.00
0.03
0.03
79.00
0.03
0.03
80.00
0.03
0.03
81.00
0.03
0.03
82.00
0.03
0.03
83.00
0.03
0.03
84.00
0.02
0.02
85.00
0.02
0.02
86.00
0.02
0.02
87.00
0.02
0.02
88.00
0.02
0.02
89.00
0.02
0.02
90.00
0.02
0.02
91.00
0.02
0.02
92.00
0.02
0.02
93.00
0.02
0.02
94.00
0.02
0.02
95.00
0.02
0.02
96.00
0.02
0.02
97.00
0.01
0.01
98.00
0.01
0.01
99.00
0.01
0.01
100.00
0.01
0.01
101.00
0.01
0.01
102.00
0.01
0.01
103.00
0.01
0.01
104.00
0.01
0.01
105.00
0.01
0.01
106.00
0.01
0.01
107.00
0.01
0.01
108.00
0.01
0.01
109.00
0.01
0.01
110.00
0.01
0.01
111.00
0.01
0.01
112.00
0.01
0.01
113.00
0.01
0.01
114.00
0.01
0.01
115.00
0.01
0.01
116.00
0.01
0.01
117.00
0.01
0.01
118.00
0.01
0.01
119.00
0.01
0.01
120.00
0.01
0.01

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 41
Summary for Pond 13P: POND 1
Inflow Area = 31.010 ac, 78.30% Impervious, Inflow Depth = 3.84" for 10yr-24hr event
Inflow = 200.18 cfs @ 11.95 hrs, Volume= 9.917 of
Outflow = 29.31 cfs @ 12.17 hrs, Volume= 9.908 af, Atten= 85%, Lag= 12.9 min
Primary = 29.31 cfs @ 12.17 hrs, Volume= 9.908 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 706.99' @ 12.17 hrs Surf.Area= 49,124 sf Storage= 219,264 cf
Plug -Flow detention time= 330.9 min calculated for 9.904 of (100% of inflow)
Center -of -Mass det. time= 332.2 min ( 1,119.0 - 786.8 )
Volume
Invert Avail.Storage Storage Description
#1
701.00'
393,227 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.00
22,606
0
0
702.00
30,532
26,569
26,569
703.00
33,334
31,933
58,502
704.00
36,378
34,856
93,358
705.00
39,732
38,055
131,413
706.00
43,988
41,860
173,273
707.00
49,187
46,588
219,861
708.00
54,818
52,003
271,863
709.00
60,624
57,721
329,584
710.00
66,662
63,643
393,227
Device Routing Invert Outlet Devices
#1 Primary 700.39' 36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 700.39' / 700.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1 701.00' 10.0" Vert. 8" Orifice C= 0.600
#3 Device 1 706.00' 36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=29.23 cfs @ 12.17 hrs HW=706.98' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 29.23 cfs of 76.82 cfs potential flow)
2=8" Orifice (Orifice Controls 6.20 cfs @ 11.36 fps)
3=Orifice/Grate (Orifice Controls 23.04 cfs @ 3.84 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=701.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 42
'0=6 1 IC AZOR117i
Hydrograph
200.18 CfS
Ir-y--Ir---r-y--Ir-y--Ir-y--Ir-y--Ir--li--r-y--Ir-y--r-y--
■Inflow
--------------------------------------------------
Ir �r
■outflow
-�-
�--r-�--r-�--r-�--r-�--�-
,,�-pr
1�'l1r�-J7'•0 I'�-V' a-
■Primary
220
--'-
-'--'
--'--'
--'--'
--'--'
--'--'1
-1--
- i - I -i i -
■ Secondary
- PeA flew='706.9
200
- -
--------,--
-------,--
-----------
-,-----� --
190
- -
---
----
- --
----
- --
-----
Sta-cte=4 19.264 jdf -
180
170
- -
--
- --
- --
- --
- ----
--
- -- ---- - -- - -- - --
160
- -
--------,--
-------,--
----------------------,--
-----,--
150
- -
--
- --
- --
- --
- ----
--
- -- ---- - -- - -- - --
140
- -
-,--,
--,--,
- --,
--,--,
-----
-,--
, --,--, --,--, --,--, - --, --,--
w 130
120110
- -
- -
--
--------,--
- --
- --
-------,--
- --
- ----
----------------------,--
--
- -- ---- - -- - -- - --
-----,--
- -
J--L-J--L-1--L-J--L-
--'--
--
- -- --'-- - -- - --L- -
o100
- -
--
- --
- --r-
--
- --
- --
- -- ----r- -- - --r- --
LL 90
- -
Zzz
J--L-J--L-1--L-J--L-
--'--
--
- -- --'-- - -- - --L- --
80
-,-
--r-
--r-
--r-
--r-,----
--r-
--r----r---r-,--r- --
70
- -
J--L-J--L-
--
-J--L-
----J--L-J--L--'--
-I
-J--L---L-J--
-
I r
60
50
', 29.31 cfs
--
---
- --
- --L-
- --r-
--L-
--
--
- --
-----J--
- -
-F- - - - - - - -- -- - --r- --
---L-J--L- -- ---L-J--
40
30
0.00 Cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 13P: POND 1
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.00
0.00
0.00
0.00
2.50
0.00
0
701.00
0.00
0.00
0.00
5.00
0.33
665
701.03
0.00
0.00
0.00
7.50
1.26
6,814
701.29
0.30
0.30
0.00
10.00
3.65
19,361
701.76
1.54
1.54
0.00
12.50
15.23
210,796
706.81
25.68
25.68
0.00
15.00
4.51
175,307
706.05
5.94
5.94
0.00
17.50
2.89
156,842
705.62
5.38
5.38
0.00
20.00
1.97
131,952
705.01
4.98
4.98
0.00
22.50
1.76
105,976
704.34
4.49
4.49
0.00
25.00
0.00
77,736
703.56
3.85
3.85
0.00
27.50
0.00
47,211
702.66
2.92
2.92
0.00
30.00
0.00
25,307
701.96
1.93
1.93
0.00
32.50
0.00
12,757
701.52
0.87
0.87
0.00
35.00
0.00
7,589
701.32
0.37
0.37
0.00
37.50
0.00
5,218
701.22
0.19
0.19
0.00
40.00
0.00
3,922
701.17
0.11
0.11
0.00
42.50
0.00
3,121
701.13
0.07
0.07
0.00
45.00
0.00
2,583
701.11
0.05
0.05
0.00
47.50
0.00
2,199
701.10
0.04
0.04
0.00
50.00
0.00
1,911
701.08
0.03
0.03
0.00
52.50
0.00
1,688
701.07
0.02
0.02
0.00
55.00
0.00
1,511
701.07
0.02
0.02
0.00
57.50
0.00
1,367
701.06
0.01
0.01
0.00
60.00
0.00
1,248
701.05
0.01
0.01
0.00
62.50
0.00
1,147
701.05
0.01
0.01
0.00
65.00
0.00
1,061
701.05
0.01
0.01
0.00
67.50
0.00
987
701.04
0.01
0.01
0.00
70.00
0.00
923
701.04
0.01
0.01
0.00
72.50
0.00
866
701.04
0.01
0.01
0.00
75.00
0.00
816
701.04
0.01
0.01
0.00
77.50
0.00
771
701.03
0.00
0.00
0.00
80.00
0.00
731
701.03
0.00
0.00
0.00
82.50
0.00
695
701.03
0.00
0.00
0.00
85.00
0.00
662
701.03
0.00
0.00
0.00
87.50
0.00
632
701.03
0.00
0.00
0.00
90.00
0.00
605
701.03
0.00
0.00
0.00
92.50
0.00
579
701.03
0.00
0.00
0.00
95.00
0.00
556
701.02
0.00
0.00
0.00
97.50
0.00
535
701.02
0.00
0.00
0.00
100.00
0.00
515
701.02
0.00
0.00
0.00
102.50
0.00
497
701.02
0.00
0.00
0.00
105.00
0.00
480
701.02
0.00
0.00
0.00
107.50
0.00
464
701.02
0.00
0.00
0.00
110.00
0.00
449
701.02
0.00
0.00
0.00
112.50
0.00
435
701.02
0.00
0.00
0.00
115.00
0.00
421
701.02
0.00
0.00
0.00
117.50
0.00
409
701.02
0.00
0.00
0.00
120.00
0.00
397
701.02
0.00
0.00
0.00
Type 1124-hr 10yr-24hr Rainfall=4.96"
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 44
Stage -Discharge for Pond 13P: POND 1
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.00
0.00
0.00
0.00
701.10
0.04
0.04
0.00
701.20
0.15
0.15
0.00
701.30
0.33
0.33
0.00
701.40
0.56
0.56
0.00
701.50
0.82
0.82
0.00
701.60
1.11
1.11
0.00
701.70
1.39
1.39
0.00
701.80
1.64
1.64
0.00
701.90
1.83
1.83
0.00
702.00
2.01
2.01
0.00
702.10
2.17
2.17
0.00
702.20
2.32
2.32
0.00
702.30
2.47
2.47
0.00
702.40
2.60
2.60
0.00
702.50
2.73
2.73
0.00
702.60
2.86
2.86
0.00
702.70
2.98
2.98
0.00
702.80
3.09
3.09
0.00
702.90
3.20
3.20
0.00
703.00
3.30
3.30
0.00
703.10
3.41
3.41
0.00
703.20
3.51
3.51
0.00
703.30
3.60
3.60
0.00
703.40
3.70
3.70
0.00
703.50
3.79
3.79
0.00
703.60
3.88
3.88
0.00
703.70
3.97
3.97
0.00
703.80
4.05
4.05
0.00
703.90
4.14
4.14
0.00
704.00
4.22
4.22
0.00
704.10
4.30
4.30
0.00
704.20
4.38
4.38
0.00
704.30
4.46
4.46
0.00
704.40
4.54
4.54
0.00
704.50
4.61
4.61
0.00
704.60
4.69
4.69
0.00
704.70
4.76
4.76
0.00
704.80
4.83
4.83
0.00
704.90
4.90
4.90
0.00
705.00
4.97
4.97
0.00
705.10
5.04
5.04
0.00
705.20
5.11
5.11
0.00
705.30
5.18
5.18
0.00
705.40
5.24
5.24
0.00
705.50
5.31
5.31
0.00
705.60
5.37
5.37
0.00
705.70
5.44
5.44
0.00
705.80
5.50
5.50
0.00
705.90
5.56
5.56
0.00
706.00
5.62
5.62
0.00
706.10
6.60
6.60
0.00
706.20
8.33
8.33
0.00
706.30
10.55
10.55
0.00
706.40
13.17
13.17
0.00
706.50
16.14
16.14
0.00
706.60
19.41
19.41
0.00
706.70
22.78
22.78
0.00
706.80
25.36
25.36
0.00
706.90
27.56
27.56
0.00
707.00
29.54
29.54
0.00
707.10
31.35
31.35
0.00
707.20
33.04
33.04
0.00
707.30
34.63
34.63
0.00
707.40
36.14
36.14
0.00
707.50
37.57
37.57
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
707.60
38.95
38.95
0.00
707.70
40.27
40.27
0.00
707.80
41.55
41.55
0.00
707.90
42.78
42.78
0.00
708.00
43.97
43.97
0.00
708.10
46.79
46.79
0.00
708.20
50.94
50.94
0.00
708.30
55.95
55.95
0.00
708.40
61.66
61.66
0.00
708.50
67.97
67.97
0.00
708.60
75.60
74.81
0.79
708.70
84.36
82.14
2.23
708.80
93.62
89.47
4.15
708.90
96.59
90.11
6.48
709.00
100.05
90.75
9.30
709.10
103.94
91.39
12.55
709.20
107.80
92.02
15.78
709.30
111.90
92.65
19.25
709.40
116.20
93.27
22.92
709.50
120.69
93.89
26.80
709.60
125.48
94.50
30.98
709.70
130.48
95.12
35.36
709.80
135.45
95.72
39.72
709.90
140.55
96.33
44.23
710.00
145.70
96.93
48.78

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 45
Stage -Area -Storage for Pond 13P: POND 1
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.00
22,606
0
701.10
23,399
2,300
701.20
24,191
4,680
701.30
24,984
7,138
701.40
25,776
9,676
701.50
26,569
12,294
701.60
27,362
14,990
701.70
28,154
17,766
701.80
28,947
20,621
701.90
29,739
23,555
702.00
30,532
26,569
702.10
30,812
29,636
702.20
31,092
32,731
702.30
31,373
35,855
702.40
31,653
39,006
702.50
31,933
42,185
702.60
32,213
45,393
702.70
32,493
48,628
702.80
32,774
51,891
702.90
33,054
55,183
703.00
33,334
58,502
703.10
33,638
61,851
703.20
33,943
65,230
703.30
34,247
68,639
703.40
34,552
72,079
703.50
34,856
75,550
703.60
35,160
79,050
703.70
35,465
82,582
703.80
35,769
86,143
703.90
36,074
89,735
704.00
36,378
93,358
704.10
36,713
97,013
704.20
37,049
100,701
704.30
37,384
104,422
704.40
37,720
108,178
704.50
38,055
111,966
704.60
38,390
115,789
704.70
38,726
119,644
704.80
39,061
123,534
704.90
39,397
127,457
705.00
39,732
131,413
705.10
40,158
135,407
705.20
40,583
139,445
705.30
41,009
143,524
705.40
41,434
147,646
705.50
41,860
151,811
705.60
42,286
156,018
705.70
42,711
160,268
705.80
43,137
164,561
705.90
43,562
168,895
706.00
43,988
173,273
706.10
44,508
177,698
706.20
45,028
182,175
706.30
45,548
186,703
706.40
46,068
191,284
706.50
46,588
195,917
706.60
47,107
200,602
706.70
47,627
205,338
706.80
48,147
210,127
706.90
48,667
214,968
707.00
49,187
219,861
707.10
49,750
224,807
707.20
50,313
229,811
707.30
50,876
234,870
707.40
51,439
239,986
707.50
52.003
245.158
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
707.60
52,566
250,386
707.70
53,129
255,671
707.80
53,692
261,012
707.90
54,255
266,409
708.00
54,818
271,863
708.10
55,399
277,374
708.20
55,979
282,943
708.30
56,560
288,570
708.40
57,140
294,255
708.50
57,721
299,998
708.60
58,302
305,799
708.70
58,882
311,658
708.80
59,463
317,575
708.90
60,043
323,551
709.00
60,624
329,584
709.10
61,228
335,677
709.20
61,832
341,830
709.30
62,435
348,043
709.40
63,039
354,317
709.50
63,643
360,651
709.60
64,247
367,045
709.70
64,851
373,500
709.80
65,454
380,015
709.90
66,058
386,591
710.00
66,662
393,227

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 46
Summary for Pond 15P: POND 6
Inflow Area = 13.860 ac, 74.39% Impervious, Inflow Depth = 3.73" for 10yr-24hr event
Inflow = 87.79 cfs @ 11.95 hrs, Volume= 4.312 of
Outflow = 6.77 cfs @ 12.50 hrs, Volume= 4.300 af, Atten= 92%, Lag= 32.8 min
Primary = 6.77 cfs @ 12.50 hrs, Volume= 4.300 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 680.19' @ 12.50 hrs Surf.Area= 37,545 sf Storage= 103,430 cf
Plug -Flow detention time= 326.4 min calculated for 4.300 of (100% of inflow)
Center -of -Mass det. time= 324.5 min ( 1,115.1 - 790.6 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
270,951 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
27,493
0 0
678.00
30,495
28,994 28,994
679.00
33,652
32,074 61,068
680.00
36,914
35,283 96,351
681.00
40,232
38,573 134,924
682.00
43,608
41,920 176,844
683.00
47,039
45,324 222,167
684.00
50,528
48,784 270,951
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1
677.00'
10.0" Vert. 8" Orifice C= 0.600
#3 Device 1
680.00'
36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1
682.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
682.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=6.77 cfs @ 12.50 hrs HW=680.19' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 6.77 cfs of 46.69 cfs potential flow)
2=8" Orifice (Orifice Controls 4.37 cfs @ 8.02 fps)
3=Orifice/Grate (Orifice Controls 2.40 cfs @ 1.40 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 47
'0=6 1 gMiMR09]i:I1I:j
Hydrograph
i
'
-r--r-r--r----t-
87.79 CfS
I II-----I---I
-I
--t--I-
--I---I
-r--I-
--'---I--'---I
-r-
-r-
r--r-r--r--I--r--I--t--I--r--
- '--I-----I-----I-----I---' --
I
■ Inflow
■ Outflow
- -
- -
-I--
--
-----I
--I--
--II--
--I--
--1,--
--I--
--I
--I--
_��Q�C��7vL
.rIr�.�I
�-
■ Primary
95
',� I
-r-
---r--r--I--t--I--t--r-r--r-r
--r-r
I
e-r fir- I I Q �II ]
I I I I I =90
OF-
■Secondary
85
80
- -
- -
J--L--1--1--1--1----1--I--
--
--'I--
--'I--
--'I--
--'I--
--
--'
} L _
-Lgrae-=�Y�+J-c+1_-
75
70
65
- -
J--L--1--1--1--1----1--I--
--L-1--L-J--L----L----1--1--T
60
Z-;-
;--;----;----;----;--;-;--;-;--;-;--;----;----;----;--
w 55
50
45
L
- -
--
--I--
--I--
--I--
--I--
--
- -- - -- --I-- --I-- --I-- --
40
-r-
35
30--
---
---
25
-
----+----+--I--
--I--
--
- -- - -- --I------+--I-- --
20
�6.77 cfs
15
0.00
cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 15P: POND 6
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.10
136
677.00
0.00
0.00
0.00
7.50
0.49
2,632
677.10
0.04
0.04
0.00
10.00
1.52
9,300
677.33
0.40
0.40
0.00
12.50
6.73
103,430
680.19
6.77
6.77
0.00
15.00
2.00
88,919
679.80
4.05
4.05
0.00
17.50
1.28
68,649
679.22
3.53
3.53
0.00
20.00
0.87
49,290
678.64
2.91
2.91
0.00
22.50
0.78
33,504
678.15
2.24
2.24
0.00
25.00
0.00
20,706
677.72
1.46
1.46
0.00
27.50
0.00
11,918
677.42
0.62
0.62
0.00
30.00
0.00
8,003
677.29
0.30
0.30
0.00
32.50
0.00
5,936
677.21
0.17
0.17
0.00
35.00
0.00
4,687
677.17
0.11
0.11
0.00
37.50
0.00
3,859
677.14
0.08
0.08
0.00
40.00
0.00
3,274
677.12
0.06
0.06
0.00
42.50
0.00
2,839
677.10
0.04
0.04
0.00
45.00
0.00
2,504
677.09
0.03
0.03
0.00
47.50
0.00
2,239
677.08
0.03
0.03
0.00
50.00
0.00
2,023
677.07
0.02
0.02
0.00
52.50
0.00
1,845
677.07
0.02
0.02
0.00
55.00
0.00
1,695
677.06
0.02
0.02
0.00
57.50
0.00
1,568
677.06
0.01
0.01
0.00
60.00
0.00
1,458
677.05
0.01
0.01
0.00
62.50
0.00
1,362
677.05
0.01
0.01
0.00
65.00
0.00
1,278
677.05
0.01
0.01
0.00
67.50
0.00
1,204
677.04
0.01
0.01
0.00
70.00
0.00
1,138
677.04
0.01
0.01
0.00
72.50
0.00
1,078
677.04
0.01
0.01
0.00
75.00
0.00
1,025
677.04
0.01
0.01
0.00
77.50
0.00
976
677.04
0.01
0.01
0.00
80.00
0.00
932
677.03
0.00
0.00
0.00
82.50
0.00
892
677.03
0.00
0.00
0.00
85.00
0.00
855
677.03
0.00
0.00
0.00
87.50
0.00
821
677.03
0.00
0.00
0.00
90.00
0.00
789
677.03
0.00
0.00
0.00
92.50
0.00
760
677.03
0.00
0.00
0.00
95.00
0.00
733
677.03
0.00
0.00
0.00
97.50
0.00
708
677.03
0.00
0.00
0.00
100.00
0.00
684
677.02
0.00
0.00
0.00
102.50
0.00
662
677.02
0.00
0.00
0.00
105.00
0.00
641
677.02
0.00
0.00
0.00
107.50
0.00
622
677.02
0.00
0.00
0.00
110.00
0.00
603
677.02
0.00
0.00
0.00
112.50
0.00
586
677.02
0.00
0.00
0.00
115.00
0.00
570
677.02
0.00
0.00
0.00
117.50
0.00
554
677.02
0.00
0.00
0.00
120.00
0.00
540
677.02
0.00
0.00
0.00
Type 1124-hr 10yr-24hr Rainfall=4.96"
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 49
Stage -Discharge for Pond 15P: POND 6
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.15
0.15
0.00
677.30
0.33
0.33
0.00
677.40
0.56
0.56
0.00
677.50
0.82
0.82
0.00
677.60
1.11
1.11
0.00
677.70
1.39
1.39
0.00
677.80
1.64
1.64
0.00
677.90
1.83
1.83
0.00
678.00
2.01
2.01
0.00
678.10
2.17
2.17
0.00
678.20
2.32
2.32
0.00
678.30
2.47
2.47
0.00
678.40
2.60
2.60
0.00
678.50
2.73
2.73
0.00
678.60
2.86
2.86
0.00
678.70
2.98
2.98
0.00
678.80
3.09
3.09
0.00
678.90
3.20
3.20
0.00
679.00
3.30
3.30
0.00
679.10
3.41
3.41
0.00
679.20
3.51
3.51
0.00
679.30
3.60
3.60
0.00
679.40
3.70
3.70
0.00
679.50
3.79
3.79
0.00
679.60
3.88
3.88
0.00
679.70
3.97
3.97
0.00
679.80
4.05
4.05
0.00
679.90
4.14
4.14
0.00
680.00
4.22
4.22
0.00
680.10
5.22
5.22
0.00
680.20
6.97
6.97
0.00
680.30
9.21
9.21
0.00
680.40
11.84
11.84
0.00
680.50
14.83
14.83
0.00
680.60
18.11
18.11
0.00
680.70
21.50
21.50
0.00
680.80
24.10
24.10
0.00
680.90
26.31
26.31
0.00
681.00
28.30
28.30
0.00
681.10
30.13
30.13
0.00
681.20
31.83
31.83
0.00
681.30
33.44
33.44
0.00
681.40
34.95
34.95
0.00
681.50
36.40
36.40
0.00
681.60
37.79
37.79
0.00
681.70
39.12
39.12
0.00
681.80
40.41
40.41
0.00
681.90
41.65
41.65
0.00
682.00
42.86
42.86
0.00
682.10
45.68
45.68
0.00
682.20
49.84
49.84
0.00
682.30
54.87
54.87
0.00
682.40
60.59
60.59
0.00
682.50
66.90
66.90
0.00
682.60
74.54
73.75
0.79
682.70
76.87
74.64
2.23
682.80
79.57
75.42
4.15
682.90
82.66
76.18
6.48
683.00
86.24
76.94
9.30
683.10
90.23
77.69
12.55
683.20
94.21
78.43
15.78
683.30
98.41
79.16
19.25
683.40
102.82
79.89
22.92
683.50
107.41
80.61
26.80
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
112.31
81.33
30.98
683.70
117.40
82.04
35.36
683.80
122.46
82.74
39.72
683.90
127.67
83.44
44.23
684.00
132.90
84.13
48.78

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 50
Stage -Area -Storage for Pond 15P: POND 6
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
27,493
0
677.10
27,793
2,764
677.20
28,093
5,559
677.30
28,394
8,383
677.40
28,694
11,237
677.50
28,994
14,122
677.60
29,294
17,036
677.70
29,594
19,981
677.80
29,895
22,955
677.90
30,195
25,960
678.00
30,495
28,994
678.10
30,811
32,059
678.20
31,126
35,156
678.30
31,442
38,285
678.40
31,758
41,445
678.50
32,074
44,636
678.60
32,389
47,859
678.70
32,705
51,114
678.80
33,021
54,400
678.90
33,336
57,718
679.00
33,652
61,068
679.10
33,978
64,449
679.20
34,304
67,863
679.30
34,631
71,310
679.40
34,957
74,789
679.50
35,283
78,301
679.60
35,609
81,846
679.70
35,935
85,423
679.80
36,262
89,033
679.90
36,588
92,675
680.00
36,914
96,351
680.10
37,246
100,058
680.20
37,578
103,800
680.30
37,909
107,574
680.40
38,241
111,382
680.50
38,573
115,222
680.60
38,905
119,096
680.70
39,237
123,003
680.80
39,568
126,943
680.90
39,900
130,917
681.00
40,232
134,924
681.10
40,570
138,964
681.20
40,907
143,037
681.30
41,245
147,145
681.40
41,582
151,286
681.50
41,920
155,462
681.60
42,258
159,670
681.70
42,595
163,913
681.80
42,933
168,189
681.90
43,270
172,500
682.00
43,608
176,844
682.10
43,951
181,221
682.20
44,294
185,634
682.30
44,637
190,080
682.40
44,980
194,561
682.50
45,324
199,076
682.60
45,667
203,626
682.70
46,010
208,210
682.80
46,353
212,828
682.90
46,696
217,480
683.00
47,039
222,167
683.10
47,388
226,888
683.20
47,737
231,645
683.30
48,086
236,436
683.40
48,435
241,262
683.50
48.784
246.123
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
49,132
251,018
683.70
49,481
255,949
683.80
49,830
260,915
683.90
50,179
265,915
684.00
50,528
270,951

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 51
Summary for Pond 18P: POST - OUTFALL #1
Inflow Area = 43.400 ac, 64.70% Impervious, Inflow Depth = 3.36" for 10yr-24hr event
Inflow = 55.99 cfs @ 11.99 hrs, Volume= 12.146 of
Primary = 55.99 cfs @ 11.99 hrs, Volume= 12.146 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 18P: POST - OUTFALL #1
Hydrograph
----------'�
--'�---'�---'�
--'�
--'�--'�---'�--'�
--'�--'�---'�---'�
--'�
--'�---'�---'� --'� --'� --'�--
❑Inflow
L
L
❑ Primary
60
55.99
cfs
---I---I-
-1
--
--1---1--J--1--L--1--J--1--L--
--1--L--1---
Area=414Q0La-�
--'--
55
--'
-1--L-----'11--1--L-------J--
I
-lpfjoW
50
--
-1--L-----I'--
--L-------J--
--L--I11--J--1--L-------1--L--IL--''--
45
--
-1--L--1---'--1--L--1---1--J--1--L--1--J--1--L--1-----1--L--
--'--
40
--
-
---------
--
------- --
-- ---- --
--
------- -- -- ----
w 35
--
1--L--1---'--
--L-------J--
--L----J--1--L--1-----1--L--L--'--
�
I
I I
I I
I
I I I I
I I I
I
I I I I I I I
3 30
p
--
1--L--1---'--1--L--1---1--J--1--L--1--J--1--L--1-----1--L--
I
I I
I I
I
I I I I
I I I
I
--'--
I I I I I I I
LL
I
I I
I I
I
I I I I
I I I
I
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25
--I
1
I
-- L-----I--
I I
1
I I
-- l
I
-----I-- J -- 1
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I
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I I I I I I I
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------- -- -- ----
5
0
0 5
10
15 20
25 30
35 40
45
50 55 60 65
70 75 80 85
90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 52
Hydrograph for Pond 18P: POST - OUTFALL #1
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.04
0.04
7.00
0.18
0.18
8.00
0.46
0.46
9.00
0.92
0.92
10.00
1.66
1.66
11.00
2.96
2.96
12.00
55.74
55.74
13.00
18.32
18.32
14.00
9.82
9.82
15.00
7.30
7.30
16.00
6.63
6.63
17.00
6.39
6.39
18.00
6.15
6.15
19.00
5.89
5.89
20.00
5.60
5.60
21.00
5.38
5.38
22.00
5.16
5.16
23.00
4.94
4.94
24.00
4.71
4.71
25.00
3.85
3.85
26.00
3.49
3.49
27.00
3.11
3.11
28.00
2.73
2.73
29.00
2.34
2.34
30.00
1.93
1.93
31.00
1.52
1.52
32.00
1.06
1.06
33.00
0.72
0.72
34.00
0.51
0.51
35.00
0.37
0.37
36.00
0.27
0.27
37.00
0.21
0.21
38.00
0.17
0.17
39.00
0.13
0.13
40.00
0.11
0.11
41.00
0.09
0.09
42.00
0.08
0.08
43.00
0.07
0.07
44.00
0.06
0.06
45.00
0.05
0.05
46.00
0.04
0.04
47.00
0.04
0.04
48.00
0.03
0.03
49.00
0.03
0.03
50.00
0.03
0.03
51.00
0.03
0.03
52.00
0.02
0.02
53.00
0.02
0.02
54.00
0.02
0.02
55.00
0.02
0.02
56.00
0.02
0.02
57.00
0.02
0.02
58.00
0.01
0.01
59.00
0.01
0.01
60.00
0.01
0.01
61.00
0.01
0.01
62.00
0.01
0.01
63.00
0.01
0.01
64.00
0.01
0.01
65.00
0.01
0.01
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.01
0.01
67.00
0.01
0.01
68.00
0.01
0.01
69.00
0.01
0.01
70.00
0.01
0.01
71.00
0.01
0.01
72.00
0.01
0.01
73.00
0.01
0.01
74.00
0.01
0.01
75.00
0.01
0.01
76.00
0.01
0.01
77.00
0.00
0.00
78.00
0.00
0.00
79.00
0.00
0.00
80.00
0.00
0.00
81.00
0.00
0.00
82.00
0.00
0.00
83.00
0.00
0.00
84.00
0.00
0.00
85.00
0.00
0.00
86.00
0.00
0.00
87.00
0.00
0.00
88.00
0.00
0.00
89.00
0.00
0.00
90.00
0.00
0.00
91.00
0.00
0.00
92.00
0.00
0.00
93.00
0.00
0.00
94.00
0.00
0.00
95.00
0.00
0.00
96.00
0.00
0.00
97.00
0.00
0.00
98.00
0.00
0.00
99.00
0.00
0.00
100.00
0.00
0.00
101.00
0.00
0.00
102.00
0.00
0.00
103.00
0.00
0.00
104.00
0.00
0.00
105.00
0.00
0.00
106.00
0.00
0.00
107.00
0.00
0.00
108.00
0.00
0.00
109.00
0.00
0.00
110.00
0.00
0.00
111.00
0.00
0.00
112.00
0.00
0.00
113.00
0.00
0.00
114.00
0.00
0.00
115.00
0.00
0.00
116.00
0.00
0.00
117.00
0.00
0.00
118.00
0.00
0.00
119.00
0.00
0.00
120.00
0.00
0.00

TriWest Building 2 SWM Type 1124-hr 10yr-24hr Rainfall=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HydroCAD®10.00-26 s/n 10066 ©2020 HydroCAD Software Solutions LLC Page 53
Summary for Pond 21 P: POST - OUTFALL #3
Inflow Area = 17.630 ac, 58.48% Impervious, Inflow Depth > 3.19" for 10yr-24hr event
Inflow = 9.64 cfs @ 12.23 hrs, Volume= 4.681 of
Primary = 9.64 cfs @ 12.23 hrs, Volume= 4.681 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Pond 21 P: POST - OUTFALL #3
Hydrograph
-'-----'-- I'I --' --------'I--' --------'-- I'I --'-----'-- I'I ---'-- ❑ Inflow
9.64 CfS ❑ Primary
10 rt--r----------t-------�-- irtfloW r',e�=17,630Ya -
9 I I I I - -'- -'---' - -I 1---I I ----'--
--I Y--Y--_____Y--Y_____--Y--Y--Y----Y--Y--Y-----I--Y Y--Y--I--
i I I I I I I I I I I I I I I I I I I I I I I I
7 __I L__L__I___I__ __L__I___I__J__L__L__I__J__ L__L__I--- I__L__L__L__I__
w 6
i I I I I I I I I I I I I I I I I I I I I I I
Q rj
LL
4-
3-
2-
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 10yr-24hrRainfa11=4.96"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 54
Hydrograph for Pond 21 P: POST - OUTFALL #3
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
0.00
0.00
0.00
1.00
0.00
0.00
2.00
0.00
0.00
3.00
0.00
0.00
4.00
0.00
0.00
5.00
0.00
0.00
6.00
0.00
0.00
7.00
0.02
0.02
8.00
0.06
0.06
9.00
0.17
0.17
10.00
0.40
0.40
11.00
0.91
0.91
12.00
5.78
5.78
13.00
6.42
6.42
14.00
4.60
4.60
15.00
4.35
4.35
16.00
4.10
4.10
17.00
3.85
3.85
18.00
3.60
3.60
19.00
3.33
3.33
20.00
3.05
3.05
21.00
2.77
2.77
22.00
2.50
2.50
23.00
2.24
2.24
24.00
1.98
1.98
25.00
1.46
1.46
26.00
1.03
1.03
27.00
0.73
0.73
28.00
0.53
0.53
29.00
0.39
0.39
30.00
0.30
0.30
31.00
0.24
0.24
32.00
0.19
0.19
33.00
0.16
0.16
34.00
0.13
0.13
35.00
0.11
0.11
36.00
0.09
0.09
37.00
0.08
0.08
38.00
0.07
0.07
39.00
0.06
0.06
40.00
0.06
0.06
41.00
0.05
0.05
42.00
0.04
0.04
43.00
0.04
0.04
44.00
0.04
0.04
45.00
0.03
0.03
46.00
0.03
0.03
47.00
0.03
0.03
48.00
0.03
0.03
49.00
0.02
0.02
50.00
0.02
0.02
51.00
0.02
0.02
52.00
0.02
0.02
53.00
0.02
0.02
54.00
0.02
0.02
55.00
0.02
0.02
56.00
0.01
0.01
57.00
0.01
0.01
58.00
0.01
0.01
59.00
0.01
0.01
60.00
0.01
0.01
61.00
0.01
0.01
62.00
0.01
0.01
63.00
0.01
0.01
64.00
0.01
0.01
65.00
0.01
0.01
Time
Inflow Elevation
Primary
(hours)
(cfs) (feet)
(cfs)
66.00
0.01
0.01
67.00
0.01
0.01
68.00
0.01
0.01
69.00
0.01
0.01
70.00
0.01
0.01
71.00
0.01
0.01
72.00
0.01
0.01
73.00
0.01
0.01
74.00
0.01
0.01
75.00
0.01
0.01
76.00
0.01
0.01
77.00
0.01
0.01
78.00
0.01
0.01
79.00
0.00
0.00
80.00
0.00
0.00
81.00
0.00
0.00
82.00
0.00
0.00
83.00
0.00
0.00
84.00
0.00
0.00
85.00
0.00
0.00
86.00
0.00
0.00
87.00
0.00
0.00
88.00
0.00
0.00
89.00
0.00
0.00
90.00
0.00
0.00
91.00
0.00
0.00
92.00
0.00
0.00
93.00
0.00
0.00
94.00
0.00
0.00
95.00
0.00
0.00
96.00
0.00
0.00
97.00
0.00
0.00
98.00
0.00
0.00
99.00
0.00
0.00
100.00
0.00
0.00
101.00
0.00
0.00
102.00
0.00
0.00
103.00
0.00
0.00
104.00
0.00
0.00
105.00
0.00
0.00
106.00
0.00
0.00
107.00
0.00
0.00
108.00
0.00
0.00
109.00
0.00
0.00
110.00
0.00
0.00
111.00
0.00
0.00
112.00
0.00
0.00
113.00
0.00
0.00
114.00
0.00
0.00
115.00
0.00
0.00
116.00
0.00
0.00
117.00
0.00
0.00
118.00
0.00
0.00
119.00
0.00
0.00
120.00
0.00
0.00

OAK
E N G I N E E R I N G
HYDROCAD OUTPUT
25-YEAR, 24-HOUR STORM EVENT (PONDS ONLY)

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 1
Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method
Pond 2P: POND 2
Peak Elev=718.32' Storage=236,108 cf Inflow=213.30 cfs 10.716 of
Primary=42.56 cfs 10.704 of Secondary=0.00 cfs 0.000 of Outflow=42.56 cfs 10.704 of
Pond 8P: POND 3
Peak EIev=705.16' Storage=161,566 cf Inflow=116.56 cfs 5.760 of
Primary=4.11 cfs 5.719 of Secondary=0.00 cfs 0.000 of Outflow=4.11 cfs 5.719 of
Pond 10P: POND 4
Peak EIev=683.07' Storage=70,704 cf Inflow=79.24 cfs 3.887 of
Primary=26.46 cfs 3.887 of Secondary=0.00 cfs 0.000 of Outflow=26.46 cfs 3.887 of
Pond 13P: POND 1
Peak EIev=707.87' Storage=265,034 cf Inflow=244.26 cfs 12.271 of
Primary=42.47 cfs 12.262 of Secondary=0.00 cfs 0.000 of Outflow=42.47 cfs 12.262 of
Pond 15P: POND 6
Peak EIev=680.59' Storage=118,669 cf Inflow=107.56 cfs 5.358 of
Primary=17.74 cfs 5.345 of Secondary=0.00 cfs 0.000 of Outflow=17.74 cfs 5.345 of

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 2
Summary for Pond 2P: POND 2
Inflow Area = 27.080 ac, 79.03% Impervious, Inflow Depth = 4.75" for 25yr-24hr event
Inflow = 213.30 cfs @ 11.95 hrs, Volume= 10.716 of
Outflow = 42.56 cfs @ 12.10 hrs, Volume= 10.704 af, Atten= 80%, Lag= 8.9 min
Primary = 42.56 cfs @ 12.10 hrs, Volume= 10.704 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 718.32' @ 12.12 hrs Surf.Area= 36,889 sf Storage= 236,108 cf
Plug -Flow detention time= 417.7 min calculated for 10.704 of (100% of inflow)
Center -of -Mass det. time= 417.0 min ( 1,198.0 - 781.0 )
Volume Invert
Avail.Storage Storage Description
#1 710.00'
301,329 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
710.00
20,568
0 0
711.00
22,310
21,439 21,439
712.00
24,113
23,212 44,651
713.00
25,975
25,044 69,695
714.00
27,897
26,936 96,631
715.00
29,879
28,888 125,519
716.00
31,920
30,900 156,418
717.00
34,021
32,971 189,389
718.00
36,183
35,102 224,491
719.00
38,404
37,294 261,784
720.00
40,686
39,545 301,329
Device Routing
Invert
Outlet Devices
#1 Primary
709.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 709.39' / 709.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
710.00'
6.0" Vert. 6" Orifice C= 0.600
#3 Device 1
715.00'
36.0" W x 6.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1
718.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
718.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=42.56 cfs @ 12.10 hrs HW=718.31' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Inlet Controls 42.56 cfs @ 13.55 fps)
2=6" Orifice (Passes < 2.68 cfs potential flow)
3=Orifice/Grate (Passes < 37.87 cfs potential flow)
=Top of OS (Passes < 8.85 cfs potential flow)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=710.00' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type // 24-hr 25yr-24hr Rainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD® 10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 3
'0 i glPAA14i
.....
213-30 r-fS
IN Inflow
IN Outflow
hiflow Area=27MTat
IN Primary
1
' •
11
0 . : •
:1
.1
1
1
LL 11
:1
i •
i • Cfs
.1
II
,1
---------------------------------------------------
1
1 1 1 1
1 .1 1
: 91 95 100 105 110 115 120

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 2P: POND 2
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
710.00
0.00
0.00
0.00
2.50
0.00
0
710.00
0.00
0.00
0.00
5.00
0.55
1,566
710.08
0.02
0.02
0.00
7.50
1.57
9,416
710.45
0.42
0.42
0.00
10.00
4.19
27,091
711.25
0.95
0.95
0.00
12.50
16.08
213,511
717.69
36.44
36.44
0.00
15.00
4.75
132,547
715.23
5.37
5.37
0.00
17.50
3.03
129,056
715.12
3.26
3.26
0.00
20.00
2.06
126,881
715.05
2.35
2.35
0.00
22.50
1.85
125,129
714.99
2.06
2.06
0.00
25.00
0.00
116,899
714.71
2.00
2.00
0.00
27.50
0.00
99,559
714.10
1.86
1.86
0.00
30.00
0.00
83,507
713.52
1.71
1.71
0.00
32.50
0.00
68,796
712.97
1.56
1.56
0.00
35.00
0.00
55,483
712.44
1.40
1.40
0.00
37.50
0.00
43,621
711.96
1.24
1.24
0.00
40.00
0.00
33,265
711.52
1.07
1.07
0.00
42.50
0.00
24,466
711.13
0.89
0.89
0.00
45.00
0.00
17,272
710.81
0.71
0.71
0.00
47.50
0.00
11,723
710.56
0.52
0.52
0.00
50.00
0.00
7,858
710.38
0.33
0.33
0.00
52.50
0.00
5,584
710.27
0.19
0.19
0.00
55.00
0.00
4,244
710.20
0.12
0.12
0.00
57.50
0.00
3,390
710.16
0.08
0.08
0.00
60.00
0.00
2,809
710.14
0.05
0.05
0.00
62.50
0.00
2,391
710.12
0.04
0.04
0.00
65.00
0.00
2,077
710.10
0.03
0.03
0.00
67.50
0.00
1,834
710.09
0.02
0.02
0.00
70.00
0.00
1,641
710.08
0.02
0.02
0.00
72.50
0.00
1,483
710.07
0.02
0.02
0.00
75.00
0.00
1,353
710.07
0.01
0.01
0.00
77.50
0.00
1,243
710.06
0.01
0.01
0.00
80.00
0.00
1,149
710.06
0.01
0.01
0.00
82.50
0.00
1,069
710.05
0.01
0.01
0.00
85.00
0.00
998
710.05
0.01
0.01
0.00
87.50
0.00
937
710.05
0.01
0.01
0.00
90.00
0.00
882
710.04
0.01
0.01
0.00
92.50
0.00
833
710.04
0.01
0.01
0.00
95.00
0.00
789
710.04
0.00
0.00
0.00
97.50
0.00
750
710.04
0.00
0.00
0.00
100.00
0.00
714
710.03
0.00
0.00
0.00
102.50
0.00
682
710.03
0.00
0.00
0.00
105.00
0.00
652
710.03
0.00
0.00
0.00
107.50
0.00
625
710.03
0.00
0.00
0.00
110.00
0.00
600
710.03
0.00
0.00
0.00
112.50
0.00
577
710.03
0.00
0.00
0.00
115.00
0.00
555
710.03
0.00
0.00
0.00
117.50
0.00
535
710.03
0.00
0.00
0.00
120.00
0.00
517
710.03
0.00
0.00
0.00
Type/1 24-hr 25yr-24hr Rainfall=5.90"
Printed 11/2/2022

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 5
Stage -Discharge for Pond 2P: POND 2
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
710.00
0.00
0.00
0.00
710.10
0.03
0.03
0.00
710.20
0.11
0.11
0.00
710.30
0.23
0.23
0.00
710.40
0.36
0.36
0.00
710.50
0.47
0.47
0.00
710.60
0.56
0.56
0.00
710.70
0.63
0.63
0.00
710.80
0.70
0.70
0.00
710.90
0.76
0.76
0.00
711.00
0.82
0.82
0.00
711.10
0.87
0.87
0.00
711.20
0.92
0.92
0.00
711.30
0.97
0.97
0.00
711.40
1.01
1.01
0.00
711.50
1.06
1.06
0.00
711.60
1.10
1.10
0.00
711.70
1.14
1.14
0.00
711.80
1.18
1.18
0.00
711.90
1.21
1.21
0.00
712.00
1.25
1.25
0.00
712.10
1.29
1.29
0.00
712.20
1.32
1.32
0.00
712.30
1.35
1.35
0.00
712.40
1.39
1.39
0.00
712.50
1.42
1.42
0.00
712.60
1.45
1.45
0.00
712.70
1.48
1.48
0.00
712.80
1.51
1.51
0.00
712.90
1.54
1.54
0.00
713.00
1.57
1.57
0.00
713.10
1.60
1.60
0.00
713.20
1.62
1.62
0.00
713.30
1.65
1.65
0.00
713.40
1.68
1.68
0.00
713.50
1.70
1.70
0.00
713.60
1.73
1.73
0.00
713.70
1.76
1.76
0.00
713.80
1.78
1.78
0.00
713.90
1.81
1.81
0.00
714.00
1.83
1.83
0.00
714.10
1.86
1.86
0.00
714.20
1.88
1.88
0.00
714.30
1.90
1.90
0.00
714.40
1.93
1.93
0.00
714.50
1.95
1.95
0.00
714.60
1.97
1.97
0.00
714.70
1.99
1.99
0.00
714.80
2.02
2.02
0.00
714.90
2.04
2.04
0.00
715.00
2.06
2.06
0.00
715.10
3.00
3.00
0.00
715.20
4.69
4.69
0.00
715.30
6.87
6.87
0.00
715.40
9.45
9.45
0.00
715.50
12.38
12.38
0.00
715.60
14.70
14.70
0.00
715.70
16.54
16.54
0.00
715.80
18.15
18.15
0.00
715.90
19.61
19.61
0.00
716.00
20.94
20.94
0.00
716.10
22.19
22.19
0.00
716.20
23.36
23.36
0.00
716.30
24.47
24.47
0.00
716.40
25.53
25.53
0.00
716.50
26.55
26.55
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
716.60
27.52
27.52
0.00
716.70
28.46
28.46
0.00
716.80
29.37
29.37
0.00
716.90
30.24
30.24
0.00
717.00
31.10
31.10
0.00
717.10
31.92
31.92
0.00
717.20
32.73
32.73
0.00
717.30
33.51
33.51
0.00
717.40
34.28
34.28
0.00
717.50
35.03
35.03
0.00
717.60
35.76
35.76
0.00
717.70
36.48
36.48
0.00
717.80
37.18
37.18
0.00
717.90
37.87
37.87
0.00
718.00
38.55
38.55
0.00
718.10
40.87
40.87
0.00
718.20
42.27
42.27
0.00
718.30
42.54
42.54
0.00
718.40
42.81
42.81
0.00
718.50
43.08
43.08
0.00
718.60
44.13
43.34
0.79
718.70
45.83
43.61
2.23
718.80
48.02
43.87
4.15
718.90
50.60
44.13
6.48
719.00
53.68
44.39
9.30
719.10
57.19
44.64
12.55
719.20
60.68
44.90
15.78
719.30
64.40
45.15
19.25
719.40
68.33
45.41
22.92
719.50
72.46
45.66
26.80
719.60
76.88
45.91
30.98
719.70
81.52
46.16
35.36
719.80
86.13
46.40
39.72
719.90
90.88
46.65
44.23
720.00
95.67
46.89
48.78

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 6
Stage -Area -Storage for Pond 2P: POND 2
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
710.00
20,568
0
710.10
20,742
2,066
710.20
20,916
4,148
710.30
21,091
6,249
710.40
21,265
8,367
710.50
21,439
10,502
710.60
21,613
12,654
710.70
21,787
14,824
710.80
21,962
17,012
710.90
22,136
19,217
711.00
22,310
21,439
711.10
22,490
23,679
711.20
22,671
25,937
711.30
22,851
28,213
711.40
23,031
30,507
711.50
23,212
32,819
711.60
23,392
35,150
711.70
23,572
37,498
711.80
23,752
39,864
711.90
23,933
42,248
712.00
24,113
44,651
712.10
24,299
47,071
712.20
24,485
49,510
712.30
24,672
51,968
712.40
24,858
54,445
712.50
25,044
56,940
712.60
25,230
59,453
712.70
25,416
61,986
712.80
25,603
64,537
712.90
25,789
67,106
713.00
25,975
69,695
713.10
26,167
72,302
713.20
26,359
74,928
713.30
26,552
77,573
713.40
26,744
80,238
713.50
26,936
82,922
713.60
27,128
85,625
713.70
27,320
88,348
713.80
27,513
91,090
713.90
27,705
93,850
714.00
27,897
96,631
714.10
28,095
99,430
714.20
28,293
102,250
714.30
28,492
105,089
714.40
28,690
107,948
714.50
28,888
110,827
714.60
29,086
113,725
714.70
29,284
116,644
714.80
29,483
119,582
714.90
29,681
122,541
715.00
29,879
125,519
715.10
30,083
128,517
715.20
30,287
131,535
715.30
30,491
134,574
715.40
30,695
137,633
715.50
30,900
140,713
715.60
31,104
143,813
715.70
31,308
146,934
715.80
31,512
150,075
715.90
31,716
153,236
716.00
31,920
156,418
716.10
32,130
159,621
716.20
32,340
162,844
716.30
32,550
166,089
716.40
32,760
169,354
716.50
32.971
172.641
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
716.60
33,181
175,948
716.70
33,391
179,277
716.80
33,601
182,626
716.90
33,811
185,997
717.00
34,021
189,389
717.10
34,237
192,801
717.20
34,453
196,236
717.30
34,670
199,692
717.40
34,886
203,170
717.50
35,102
206,669
717.60
35,318
210,190
717.70
35,534
213,733
717.80
35,751
217,297
717.90
35,967
220,883
718.00
36,183
224,491
718.10
36,405
228,120
718.20
36,627
231,772
718.30
36,849
235,445
718.40
37,071
239,141
718.50
37,294
242,860
718.60
37,516
246,600
718.70
37,738
250,363
718.80
37,960
254,148
718.90
38,182
257,955
719.00
38,404
261,784
719.10
38,632
265,636
719.20
38,860
269,510
719.30
39,089
273,408
719.40
39,317
277,328
719.50
39,545
281,271
719.60
39,773
285,237
719.70
40,001
289,226
719.80
40,230
293,237
719.90
40,458
297,272
720.00
40,686
301,329

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 7
Summary for Pond 8P: POND 3
Inflow Area = 15.260 ac, 72.15% Impervious, Inflow Depth = 4.53" for 25yr-24hr event
Inflow = 116.56 cfs @ 11.95 hrs, Volume= 5.760 of
Outflow = 4.11 cfs @ 13.55 hrs, Volume= 5.719 af, Atten= 96%, Lag= 95.8 min
Primary = 4.11 cfs @ 13.55 hrs, Volume= 5.719 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 705.16' @ 13.55 hrs Surf.Area= 58,515 sf Storage= 161,566 cf
Plug -Flow detention time= 741.2 min calculated for 5.717 of (99% of inflow)
Center -of -Mass det. time= 738.7 min ( 1,526.6 - 787.9 )
Volume Invert
Avail.Storage Storage Description
#1 702.00'
503,002 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
702.00
43,792
0 0
703.00
48,320
46,056 46,056
704.00
52,961
50,641 96,697
705.00
57,717
55,339 152,036
706.00
62,582
60,150 212,185
707.00
67,552
65,067 277,252
708.00
72,628
70,090 347,342
709.00
77,809
75,219 422,561
710.00
83,074
80,442 503,002
Device Routing
Invert
Outlet Devices
#1 Primary
701.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 701.39' / 701.00' S= 0.0050 T Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
702.00'
8.0" Vert. 8" Orifice C= 0.600
#3 Device 1
705.00'
36.0" W x 6.0" H Vert. Orifice/Grate X 2.00 C= 0.600
#4 Device 1
708.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
708.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=4.11 cfs @ 13.55 hrs HW=705.16' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 4.11 cfs of 24.28 cfs potential flow)
2=8" Orifice (Orifice Controls 2.83 cfs @ 8.10 fps)
3=Orifice/Grate (Orifice Controls 1.28 cfs @ 1.30 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=702.00' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type // 24-hr 25yr-24hr Rainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 8
Hydrograph
-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--
116.56 cfs
----,
-
--; ----;
- --, ----;
----' ____ --'--' --'--' --'--
■Inflow
■ Outflow
- -
--
-
--
-
-- -
--
- --r-
/� .,�Crq r
1 nfl" Arr ea—'� &26-0' atv
■ Primary
130
■ Secondary
120
-�-
�--�r-�--�r-�--r-�--it-�--�i
--1--�r
6-�r r-
Irea�lle l/—I�V�
110
- �,-
-1-
-�,--�,I
--r-
--�,--�,I
--r-
-
�,--�,I--�,--�,I
--r-
--r-1--r-
- �,--�,I--�,--�,,-Storade�1'�61�56G
cf
--r-�--r- -=161 1-6 cf
100
80
w
u 70
-I-
-1--r--1--r-7--r--1--it--1
--1
F-1--r----F -1 F--1 T- -1--
LL
50
-1---r---r---r---r-1--r---r---r----r---r-1--r-�--
30
201
4.11 Cfs
0.00 Cfs
0
0
5 10 15 20 25
30
35
40
45
50 55
6o
65 70 75
80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 8P: POND 3
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
702.00
0.00
0.00
0.00
2.50
0.00
0
702.00
0.00
0.00
0.00
5.00
0.18
321
702.01
0.00
0.00
0.00
7.50
0.71
4,136
702.09
0.03
0.03
0.00
10.00
2.09
14,350
702.32
0.32
0.32
0.00
12.50
8.89
153,994
705.03
2.88
2.88
0.00
15.00
2.63
158,153
705.11
3.46
3.46
0.00
17.50
1.69
149,837
704.96
2.72
2.72
0.00
20.00
1.15
138,514
704.76
2.62
2.62
0.00
22.50
1.03
125,253
704.53
2.49
2.49
0.00
25.00
0.00
109,171
704.23
2.32
2.32
0.00
27.50
0.00
89,391
703.86
2.08
2.08
0.00
30.00
0.00
71,798
703.52
1.83
1.83
0.00
32.50
0.00
56,460
703.21
1.58
1.58
0.00
35.00
0.00
43,442
702.95
1.32
1.32
0.00
37.50
0.00
32,803
702.72
1.05
1.05
0.00
40.00
0.00
24,578
702.55
0.77
0.77
0.00
42.50
0.00
18,872
702.42
0.51
0.51
0.00
45.00
0.00
15,036
702.34
0.35
0.35
0.00
47.50
0.00
12,376
702.28
0.25
0.25
0.00
50.00
0.00
10,457
702.24
0.18
0.18
0.00
52.50
0.00
9,021
702.20
0.14
0.14
0.00
55.00
0.00
7,914
702.18
0.11
0.11
0.00
57.50
0.00
7,038
702.16
0.09
0.09
0.00
60.00
0.00
6,329
702.14
0.07
0.07
0.00
62.50
0.00
5,745
702.13
0.06
0.06
0.00
65.00
0.00
5,257
702.12
0.05
0.05
0.00
67.50
0.00
4,843
702.11
0.04
0.04
0.00
70.00
0.00
4,487
702.10
0.04
0.04
0.00
72.50
0.00
4,179
702.09
0.03
0.03
0.00
75.00
0.00
3,909
702.09
0.03
0.03
0.00
77.50
0.00
3,672
702.08
0.02
0.02
0.00
80.00
0.00
3,461
702.08
0.02
0.02
0.00
82.50
0.00
3,272
702.07
0.02
0.02
0.00
85.00
0.00
3,103
702.07
0.02
0.02
0.00
87.50
0.00
2,950
702.07
0.02
0.02
0.00
90.00
0.00
2,811
702.06
0.01
0.01
0.00
92.50
0.00
2,684
702.06
0.01
0.01
0.00
95.00
0.00
2,568
702.06
0.01
0.01
0.00
97.50
0.00
2,462
702.06
0.01
0.01
0.00
100.00
0.00
2,364
702.05
0.01
0.01
0.00
102.50
0.00
2,273
702.05
0.01
0.01
0.00
105.00
0.00
2,189
702.05
0.01
0.01
0.00
107.50
0.00
2,111
702.05
0.01
0.01
0.00
110.00
0.00
2,038
702.05
0.01
0.01
0.00
112.50
0.00
1,970
702.04
0.01
0.01
0.00
115.00
0.00
1,906
702.04
0.01
0.01
0.00
117.50
0.00
1,846
702.04
0.01
0.01
0.00
120.00
0.00
1,790
702.04
0.01
0.01
0.00
Type/1 24-hr 25yr-24hr Rainfall=5.90"
Printed 11/2/2022

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 10
Stage -Discharge for Pond 8P: POND 3
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
702.00
0.00
0.00
0.00
702.10
0.04
0.04
0.00
702.20
0.13
0.13
0.00
702.30
0.28
0.28
0.00
702.40
0.47
0.47
0.00
702.50
0.68
0.68
0.00
702.60
0.87
0.87
0.00
702.70
1.02
1.02
0.00
702.80
1.15
1.15
0.00
702.90
1.27
1.27
0.00
703.00
1.37
1.37
0.00
703.10
1.47
1.47
0.00
703.20
1.56
1.56
0.00
703.30
1.65
1.65
0.00
703.40
1.74
1.74
0.00
703.50
1.82
1.82
0.00
703.60
1.89
1.89
0.00
703.70
1.96
1.96
0.00
703.80
2.04
2.04
0.00
703.90
2.10
2.10
0.00
704.00
2.17
2.17
0.00
704.10
2.23
2.23
0.00
704.20
2.30
2.30
0.00
704.30
2.36
2.36
0.00
704.40
2.42
2.42
0.00
704.50
2.47
2.47
0.00
704.60
2.53
2.53
0.00
704.70
2.59
2.59
0.00
704.80
2.64
2.64
0.00
704.90
2.69
2.69
0.00
705.00
2.74
2.74
0.00
705.10
3.40
3.40
0.00
705.20
4.57
4.57
0.00
705.30
6.06
6.06
0.00
705.40
7.82
7.82
0.00
705.50
9.80
9.80
0.00
705.60
11.38
11.38
0.00
705.70
12.64
12.64
0.00
705.80
13.75
13.75
0.00
705.90
14.75
14.75
0.00
706.00
15.67
15.67
0.00
706.10
16.53
16.53
0.00
706.20
17.34
17.34
0.00
706.30
18.11
18.11
0.00
706.40
18.85
18.85
0.00
706.50
19.55
19.55
0.00
706.60
20.23
20.23
0.00
706.70
20.88
20.88
0.00
706.80
21.52
21.52
0.00
706.90
22.13
22.13
0.00
707.00
22.72
22.72
0.00
707.10
23.30
23.30
0.00
707.20
23.87
23.87
0.00
707.30
24.41
24.41
0.00
707.40
24.95
24.95
0.00
707.50
25.48
25.48
0.00
707.60
25.99
25.99
0.00
707.70
26.49
26.49
0.00
707.80
26.99
26.99
0.00
707.90
27.47
27.47
0.00
708.00
27.95
27.95
0.00
708.10
30.07
30.07
0.00
708.20
33.55
33.55
0.00
708.30
36.77
36.77
0.00
708.40
37.08
37.08
0.00
708.50
37.39
37.39
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
708.60
38.48
37.70
0.79
708.70
40.22
38.00
2.23
708.80
42.45
38.30
4.15
708.90
45.07
38.60
6.48
709.00
48.19
38.89
9.30
709.10
51.73
39.18
12.55
709.20
55.26
39.47
15.78
709.30
59.01
39.76
19.25
709.40
62.97
40.05
22.92
709.50
67.13
40.33
26.80
709.60
71.59
40.62
30.98
709.70
76.26
40.90
35.36
709.80
80.90
41.18
39.72
709.90
85.68
41.45
44.23
710.00
90.50
41.73
48.78

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 11
Stage -Area -Storage for Pond 8P: POND 3
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
702.00
43,792
0
702.10
44,245
4,402
702.20
44,698
8,849
702.30
45,150
13,341
702.40
45,603
17,879
702.50
46,056
22,462
702.60
46,509
27,090
702.70
46,962
31,764
702.80
47,414
36,483
702.90
47,867
41,247
703.00
48,320
46,056
703.10
48,784
50,911
703.20
49,248
55,813
703.30
49,712
60,761
703.40
50,176
65,755
703.50
50,641
70,796
703.60
51,105
75,883
703.70
51,569
81,017
703.80
52,033
86,197
703.90
52,497
91,424
704.00
52,961
96,697
704.10
53,437
102,016
704.20
53,912
107,384
704.30
54,388
112,799
704.40
54,863
118,261
704.50
55,339
123,772
704.60
55,815
129,329
704.70
56,290
134,934
704.80
56,766
140,587
704.90
57,241
146,288
705.00
57,717
152,036
705.10
58,204
157,832
705.20
58,690
163,676
705.30
59,176
169,570
705.40
59,663
175,511
705.50
60,150
181,502
705.60
60,636
187,541
705.70
61,123
193,629
705.80
61,609
199,766
705.90
62,095
205,951
706.00
62,582
212,185
706.10
63,079
218,468
706.20
63,576
224,801
706.30
64,073
231,183
706.40
64,570
237,615
706.50
65,067
244,097
706.60
65,564
250,629
706.70
66,061
257,210
706.80
66,558
263,841
706.90
67,055
270,522
707.00
67,552
277,252
707.10
68,060
284,033
707.20
68,567
290,864
707.30
69,075
297,746
707.40
69,582
304,679
707.50
70,090
311,663
707.60
70,598
318,697
707.70
71,105
325,782
707.80
71,613
332,918
707.90
72,120
340,105
708.00
72,628
347,342
708.10
73,146
354,631
708.20
73,664
361,971
708.30
74,182
369,364
708.40
74,700
376,808
708.50
75.219
384.304
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
708.60
75,737
391,851
708.70
76,255
399,451
708.80
76,773
407,102
708.90
77,291
414,806
709.00
77,809
422,561
709.10
78,336
430,368
709.20
78,862
438,228
709.30
79,388
446,140
709.40
79,915
454,105
709.50
80,442
462,123
709.60
80,968
470,194
709.70
81,495
478,317
709.80
82,021
486,492
709.90
82,547
494,721
710.00
83,074
503,002

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 12
Summary for Pond 10P: POND 4
Inflow Area = 10.550 ac, 69.48% Impervious, Inflow Depth = 4.42" for 25yr-24hr event
Inflow = 79.24 cfs @ 11.95 hrs, Volume= 3.887 of
Outflow = 26.46 cfs @ 12.08 hrs, Volume= 3.887 af, Atten= 67%, Lag= 7.6 min
Primary = 26.46 cfs @ 12.08 hrs, Volume= 3.887 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 683.07' @ 12.08 hrs Surf.Area= 21,853 sf Storage= 70,704 cf
Plug -Flow detention time= 142.3 min calculated for 3.885 of (100% of inflow)
Center -of -Mass det. time= 143.1 min ( 934.2 - 791.1 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
120,639 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
4,560
0 0
678.00
5,909
5,235 5,235
679.00
7,780
6,845 12,079
680.00
10,667
9,224 21,303
681.00
14,076
12,372 33,674
682.00
17,710
15,893 49,567
683.00
21,571
19,641 69,208
684.00
25,659
23,615 92,823
685.00
29,973
27,816 120,639
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 T Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
677.00'
8.0" Vert. 8" Orifice C= 0.600
#3 Device 1
682.50'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#4 Secondary
683.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=25.88 cfs @ 12.08 hrs HW=683.06' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 25.88 cfs of 36.02 cfs potential flow)
2=8" Orifice (Orifice Controls 4.02 cfs @ 11.52 fps)
1
3=Top of OS (Weir Controls 21.86 cfs @ 2.44 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
4=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type // 24-hr 25yr-24hr Rainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 13
'0=6 1 gM1111 191MIZ!
Hydrograph
-�--L-J--L--1--1--1--1--I--1--I--�--L-1--L-J--L--1--L--1--1--I--1--
79.24 cfs----+----+------------------------+----+--
■ Inflow
■outflow
-+-
+--;----;----;----;--I--;
y� (}I {}I-
■Primary
-Y-
Y--Y--I--+--I--+--I--Y--r-Y--r-�--r-Y--r--I--Y--I--+--I--Y--
■ Secondary
85
-;-
;--;----;----;----;----;--;-;-RerEle��63-A'--
80
75
-;-
-;-
;--;----;----;----;--;-;--;-;
;--;----;----;----;--;-;--;-;-
--r-;-- --T -
Wrago-- 704-0
70
60
55
w 50
/li
-I--
--I--
--I--
- --I--
- -_--
--_--
--_----_---I-- - --I-- - --I-- - --
u
' 45
'I
3
0 40
-L--1--1--1--1----1--I--
--L-
--L-J--L----L----L--I--1-
M 35
26.46 cfs
J--L--1--1--1--1----1--I--
--L-1--L-J--L----L--1--1--1--1--
30
25
20Y--Y-Y--Y-Y--Y--I--Y--I--t--I--Y--
15
10
0.00 cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 10P: POND 4
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.08
105
677.02
0.00
0.00
0.00
7.50
0.44
1,439
677.30
0.29
0.29
0.00
10.00
1.36
3,336
677.67
0.97
0.97
0.00
12.50
6.08
62,931
682.70
8.61
8.61
0.00
15.00
1.81
50,368
682.04
3.65
3.65
0.00
17.50
1.16
32,129
680.89
3.17
3.17
0.00
20.00
0.79
15,464
679.40
2.42
2.42
0.00
22.50
0.71
5,119
677.98
1.35
1.35
0.00
25.00
0.00
1,312
677.28
0.24
0.24
0.00
27.50
0.00
459
677.10
0.03
0.03
0.00
30.00
0.00
271
677.06
0.01
0.01
0.00
32.50
0.00
191
677.04
0.01
0.01
0.00
35.00
0.00
147
677.03
0.00
0.00
0.00
37.50
0.00
119
677.03
0.00
0.00
0.00
40.00
0.00
101
677.02
0.00
0.00
0.00
42.50
0.00
87
677.02
0.00
0.00
0.00
45.00
0.00
76
677.02
0.00
0.00
0.00
47.50
0.00
68
677.01
0.00
0.00
0.00
50.00
0.00
61
677.01
0.00
0.00
0.00
52.50
0.00
56
677.01
0.00
0.00
0.00
55.00
0.00
51
677.01
0.00
0.00
0.00
57.50
0.00
48
677.01
0.00
0.00
0.00
60.00
0.00
44
677.01
0.00
0.00
0.00
62.50
0.00
41
677.01
0.00
0.00
0.00
65.00
0.00
39
677.01
0.00
0.00
0.00
67.50
0.00
36
677.01
0.00
0.00
0.00
70.00
0.00
34
677.01
0.00
0.00
0.00
72.50
0.00
33
677.01
0.00
0.00
0.00
75.00
0.00
31
677.01
0.00
0.00
0.00
77.50
0.00
30
677.01
0.00
0.00
0.00
80.00
0.00
28
677.01
0.00
0.00
0.00
82.50
0.00
27
677.01
0.00
0.00
0.00
85.00
0.00
26
677.01
0.00
0.00
0.00
87.50
0.00
25
677.01
0.00
0.00
0.00
90.00
0.00
24
677.01
0.00
0.00
0.00
92.50
0.00
23
677.01
0.00
0.00
0.00
95.00
0.00
22
677.00
0.00
0.00
0.00
97.50
0.00
21
677.00
0.00
0.00
0.00
100.00
0.00
21
677.00
0.00
0.00
0.00
102.50
0.00
20
677.00
0.00
0.00
0.00
105.00
0.00
19
677.00
0.00
0.00
0.00
107.50
0.00
19
677.00
0.00
0.00
0.00
110.00
0.00
18
677.00
0.00
0.00
0.00
112.50
0.00
18
677.00
0.00
0.00
0.00
115.00
0.00
17
677.00
0.00
0.00
0.00
117.50
0.00
17
677.00
0.00
0.00
0.00
120.00
0.00
16
677.00
0.00
0.00
0.00
Type/1 24-hr 25yr-24hr Rainfall=5.90"
Printed 11/2/2022

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 15
Stage -Discharge for Pond 10P: POND 4
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.13
0.13
0.00
677.30
0.28
0.28
0.00
677.40
0.47
0.47
0.00
677.50
0.68
0.68
0.00
677.60
0.87
0.87
0.00
677.70
1.02
1.02
0.00
677.80
1.15
1.15
0.00
677.90
1.27
1.27
0.00
678.00
1.37
1.37
0.00
678.10
1.47
1.47
0.00
678.20
1.56
1.56
0.00
678.30
1.65
1.65
0.00
678.40
1.74
1.74
0.00
678.50
1.82
1.82
0.00
678.60
1.89
1.89
0.00
678.70
1.96
1.96
0.00
678.80
2.04
2.04
0.00
678.90
2.10
2.10
0.00
679.00
2.17
2.17
0.00
679.10
2.23
2.23
0.00
679.20
2.30
2.30
0.00
679.30
2.36
2.36
0.00
679.40
2.42
2.42
0.00
679.50
2.47
2.47
0.00
679.60
2.53
2.53
0.00
679.70
2.59
2.59
0.00
679.80
2.64
2.64
0.00
679.90
2.69
2.69
0.00
680.00
2.74
2.74
0.00
680.10
2.80
2.80
0.00
680.20
2.85
2.85
0.00
680.30
2.89
2.89
0.00
680.40
2.94
2.94
0.00
680.50
2.99
2.99
0.00
680.60
3.04
3.04
0.00
680.70
3.08
3.08
0.00
680.80
3.13
3.13
0.00
680.90
3.17
3.17
0.00
681.00
3.22
3.22
0.00
681.10
3.26
3.26
0.00
681.20
3.30
3.30
0.00
681.30
3.35
3.35
0.00
681.40
3.39
3.39
0.00
681.50
3.43
3.43
0.00
681.60
3.47
3.47
0.00
681.70
3.51
3.51
0.00
681.80
3.55
3.55
0.00
681.90
3.59
3.59
0.00
682.00
3.63
3.63
0.00
682.10
3.67
3.67
0.00
682.20
3.71
3.71
0.00
682.30
3.75
3.75
0.00
682.40
3.78
3.78
0.00
682.50
3.82
3.82
0.00
682.60
5.51
5.51
0.00
682.70
8.57
8.57
0.00
682.80
12.53
12.53
0.00
682.90
17.20
17.20
0.00
683.00
22.50
22.50
0.00
683.10
28.35
28.35
0.00
683.20
34.71
34.71
0.00
683.30
36.77
36.77
0.00
683.40
37.08
37.08
0.00
683.50
37.39
37.39
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
38.48
37.70
0.79
683.70
40.22
38.00
2.23
683.80
42.45
38.30
4.15
683.90
45.07
38.60
6.48
684.00
48.19
38.89
9.30
684.10
51.73
39.18
12.55
684.20
55.26
39.47
15.78
684.30
59.01
39.76
19.25
684.40
62.97
40.05
22.92
684.50
67.13
40.33
26.80
684.60
71.59
40.62
30.98
684.70
76.26
40.90
35.36
684.80
80.90
41.18
39.72
684.90
85.68
41.45
44.23
685.00
90.50
41.73
48.78

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 16
Stage -Area -Storage for Pond 10P: POND 4
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
4,560
0
677.10
4,695
463
677.20
4,830
939
677.30
4,965
1,429
677.40
5,100
1,932
677.50
5,235
2,449
677.60
5,369
2,979
677.70
5,504
3,523
677.80
5,639
4,080
677.90
5,774
4,650
678.00
5,909
5,235
678.10
6,096
5,835
678.20
6,283
6,454
678.30
6,470
7,091
678.40
6,657
7,748
678.50
6,845
8,423
678.60
7,032
9,117
678.70
7,219
9,829
678.80
7,406
10,560
678.90
7,593
11,310
679.00
7,780
12,079
679.10
8,069
12,871
679.20
8,357
13,693
679.30
8,646
14,543
679.40
8,935
15,422
679.50
9,224
16,330
679.60
9,512
17,267
679.70
9,801
18,232
679.80
10,090
19,227
679.90
10,378
20,250
680.00
10,667
21,303
680.10
11,008
22,386
680.20
11,349
23,504
680.30
11,690
24,656
680.40
12,031
25,842
680.50
12,372
27,062
680.60
12,712
28,316
680.70
13,053
29,605
680.80
13,394
30,927
680.90
13,735
32,283
681.00
14,076
33,674
681.10
14,439
35,100
681.20
14,803
36,562
681.30
15,166
38,060
681.40
15,530
39,595
681.50
15,893
41,166
681.60
16,256
42,774
681.70
16,620
44,418
681.80
16,983
46,098
681.90
17,347
47,814
682.00
17,710
49,567
682.10
18,096
51,357
682.20
18,482
53,186
682.30
18,868
55,054
682.40
19,254
56,960
682.50
19,641
58,905
682.60
20,027
60,888
682.70
20,413
62,910
682.80
20,799
64,971
682.90
21,185
67,070
683.00
21,571
69,208
683.10
21,980
71,385
683.20
22,389
73,603
683.30
22,797
75,863
683.40
23,206
78,163
683.50
23.615
80.504
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
24,024
82,886
683.70
24,433
85,309
683.80
24,841
87,772
683.90
25,250
90,277
684.00
25,659
92,823
684.10
26,090
95,410
684.20
26,522
98,041
684.30
26,953
100,714
684.40
27,385
103,431
684.50
27,816
106,191
684.60
28,247
108,994
684.70
28,679
111,841
684.80
29,110
114,730
684.90
29,542
117,663
685.00
29,973
120,639

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 17
Summary for Pond 13P: POND 1
Inflow Area = 31.010 ac, 78.30% Impervious, Inflow Depth = 4.75" for 25yr-24hr event
Inflow = 244.26 cfs @ 11.95 hrs, Volume= 12.271 of
Outflow = 42.47 cfs @ 12.14 hrs, Volume= 12.262 af, Atten= 83%, Lag= 11.0 min
Primary = 42.47 cfs @ 12.14 hrs, Volume= 12.262 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 707.87' @ 12.14 hrs Surf.Area= 54,112 sf Storage= 265,034 cf
Plug -Flow detention time= 297.4 min calculated for 12.262 of (100% of inflow)
Center -of -Mass det. time= 296.8 min ( 1,077.8 - 781.0 )
Volume
Invert Avail.Storage Storage Description
#1
701.00'
393,227 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.00
22,606
0
0
702.00
30,532
26,569
26,569
703.00
33,334
31,933
58,502
704.00
36,378
34,856
93,358
705.00
39,732
38,055
131,413
706.00
43,988
41,860
173,273
707.00
49,187
46,588
219,861
708.00
54,818
52,003
271,863
709.00
60,624
57,721
329,584
710.00
66,662
63,643
393,227
Device Routing Invert Outlet Devices
#1 Primary 700.39' 36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 700.39' / 700.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1 701.00' 10.0" Vert. 8" Orifice C= 0.600
#3 Device 1 706.00' 36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=42.42 cfs @ 12.14 hrs HW=707.87' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 42.42 cfs of 83.24 cfs potential flow)
2=8" Orifice (Orifice Controls 6.67 cfs @ 12.23 fps)
3=Orifice/Grate (Orifice Controls 35.75 cfs @ 5.96 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=701.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type // 24-hr 25yr-24hr Rainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 18
'0=6 1 IC AZOR117i
Hydrograph
244.26 Cfs
utflowInflorw
r- --r- --r- --r- --r-
--r---r----r- --r- --r- --
IAr�ea=31 I.0101 ac
jInflow
imary
condary
260
- -
r--r- --r- --r- --r- --r-r--r-P-eat€1eV=7-07:&7--
240
- -
- I-----�---- --- --------------Sforate=2"ii34-cf-
1 1
220
-r-
200
r--r-r--r-r--r-r--r-r--r-r--r-r--r--i--r-r--r-r--r-r--
-�-
�--Ir-�--Ir-�--r-�--Ir-�--Ir-�--Ir-�--Ir--li--r-�--Ir-�--r-�--
w 160
' 140
LL 120
100
--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--
80
42.47 Cfs
J--
---L-1--r- -- -----J--
---r-J--r- -- ---L-J--
60-
40
0.00
Cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 13P: POND 1
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.00
0.00
0.00
0.00
2.50
0.00
0
701.00
0.00
0.00
0.00
5.00
0.63
1,788
701.08
0.02
0.02
0.00
7.50
1.80
10,366
701.43
0.62
0.62
0.00
10.00
4.80
26,061
701.98
1.98
1.98
0.00
12.50
18.41
246,365
707.52
37.90
37.90
0.00
15.00
5.43
178,472
706.12
6.86
6.86
0.00
17.50
3.47
164,144
705.79
5.49
5.49
0.00
20.00
2.36
142,386
705.27
5.16
5.16
0.00
22.50
2.11
117,922
704.66
4.73
4.73
0.00
25.00
0.00
89,271
703.89
4.13
4.13
0.00
27.50
0.00
56,111
702.93
3.23
3.23
0.00
30.00
0.00
31,371
702.16
2.26
2.26
0.00
32.50
0.00
15,708
701.63
1.18
1.18
0.00
35.00
0.00
8,797
701.37
0.47
0.47
0.00
37.50
0.00
5,816
701.25
0.23
0.23
0.00
40.00
0.00
4,267
701.18
0.13
0.13
0.00
42.50
0.00
3,343
701.14
0.08
0.08
0.00
45.00
0.00
2,736
701.12
0.06
0.06
0.00
47.50
0.00
2,309
701.10
0.04
0.04
0.00
50.00
0.00
1,995
701.09
0.03
0.03
0.00
52.50
0.00
1,754
701.08
0.02
0.02
0.00
55.00
0.00
1,564
701.07
0.02
0.02
0.00
57.50
0.00
1,410
701.06
0.02
0.02
0.00
60.00
0.00
1,284
701.06
0.01
0.01
0.00
62.50
0.00
1,178
701.05
0.01
0.01
0.00
65.00
0.00
1,087
701.05
0.01
0.01
0.00
67.50
0.00
1,010
701.04
0.01
0.01
0.00
70.00
0.00
942
701.04
0.01
0.01
0.00
72.50
0.00
883
701.04
0.01
0.01
0.00
75.00
0.00
831
701.04
0.01
0.01
0.00
77.50
0.00
785
701.03
0.00
0.00
0.00
80.00
0.00
743
701.03
0.00
0.00
0.00
82.50
0.00
706
701.03
0.00
0.00
0.00
85.00
0.00
672
701.03
0.00
0.00
0.00
87.50
0.00
641
701.03
0.00
0.00
0.00
90.00
0.00
613
701.03
0.00
0.00
0.00
92.50
0.00
587
701.03
0.00
0.00
0.00
95.00
0.00
564
701.02
0.00
0.00
0.00
97.50
0.00
542
701.02
0.00
0.00
0.00
100.00
0.00
521
701.02
0.00
0.00
0.00
102.50
0.00
503
701.02
0.00
0.00
0.00
105.00
0.00
485
701.02
0.00
0.00
0.00
107.50
0.00
469
701.02
0.00
0.00
0.00
110.00
0.00
453
701.02
0.00
0.00
0.00
112.50
0.00
439
701.02
0.00
0.00
0.00
115.00
0.00
426
701.02
0.00
0.00
0.00
117.50
0.00
413
701.02
0.00
0.00
0.00
120.00
0.00
401
701.02
0.00
0.00
0.00
Type/1 24-hr 25yr-24hr Rainfall=5.90"
Printed 11/2/2022

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 20
Stage -Discharge for Pond 13P: POND 1
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.00
0.00
0.00
0.00
701.10
0.04
0.04
0.00
701.20
0.15
0.15
0.00
701.30
0.33
0.33
0.00
701.40
0.56
0.56
0.00
701.50
0.82
0.82
0.00
701.60
1.11
1.11
0.00
701.70
1.39
1.39
0.00
701.80
1.64
1.64
0.00
701.90
1.83
1.83
0.00
702.00
2.01
2.01
0.00
702.10
2.17
2.17
0.00
702.20
2.32
2.32
0.00
702.30
2.47
2.47
0.00
702.40
2.60
2.60
0.00
702.50
2.73
2.73
0.00
702.60
2.86
2.86
0.00
702.70
2.98
2.98
0.00
702.80
3.09
3.09
0.00
702.90
3.20
3.20
0.00
703.00
3.30
3.30
0.00
703.10
3.41
3.41
0.00
703.20
3.51
3.51
0.00
703.30
3.60
3.60
0.00
703.40
3.70
3.70
0.00
703.50
3.79
3.79
0.00
703.60
3.88
3.88
0.00
703.70
3.97
3.97
0.00
703.80
4.05
4.05
0.00
703.90
4.14
4.14
0.00
704.00
4.22
4.22
0.00
704.10
4.30
4.30
0.00
704.20
4.38
4.38
0.00
704.30
4.46
4.46
0.00
704.40
4.54
4.54
0.00
704.50
4.61
4.61
0.00
704.60
4.69
4.69
0.00
704.70
4.76
4.76
0.00
704.80
4.83
4.83
0.00
704.90
4.90
4.90
0.00
705.00
4.97
4.97
0.00
705.10
5.04
5.04
0.00
705.20
5.11
5.11
0.00
705.30
5.18
5.18
0.00
705.40
5.24
5.24
0.00
705.50
5.31
5.31
0.00
705.60
5.37
5.37
0.00
705.70
5.44
5.44
0.00
705.80
5.50
5.50
0.00
705.90
5.56
5.56
0.00
706.00
5.62
5.62
0.00
706.10
6.60
6.60
0.00
706.20
8.33
8.33
0.00
706.30
10.55
10.55
0.00
706.40
13.17
13.17
0.00
706.50
16.14
16.14
0.00
706.60
19.41
19.41
0.00
706.70
22.78
22.78
0.00
706.80
25.36
25.36
0.00
706.90
27.56
27.56
0.00
707.00
29.54
29.54
0.00
707.10
31.35
31.35
0.00
707.20
33.04
33.04
0.00
707.30
34.63
34.63
0.00
707.40
36.14
36.14
0.00
707.50
37.57
37.57
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
707.60
38.95
38.95
0.00
707.70
40.27
40.27
0.00
707.80
41.55
41.55
0.00
707.90
42.78
42.78
0.00
708.00
43.97
43.97
0.00
708.10
46.79
46.79
0.00
708.20
50.94
50.94
0.00
708.30
55.95
55.95
0.00
708.40
61.66
61.66
0.00
708.50
67.97
67.97
0.00
708.60
75.60
74.81
0.79
708.70
84.36
82.14
2.23
708.80
93.62
89.47
4.15
708.90
96.59
90.11
6.48
709.00
100.05
90.75
9.30
709.10
103.94
91.39
12.55
709.20
107.80
92.02
15.78
709.30
111.90
92.65
19.25
709.40
116.20
93.27
22.92
709.50
120.69
93.89
26.80
709.60
125.48
94.50
30.98
709.70
130.48
95.12
35.36
709.80
135.45
95.72
39.72
709.90
140.55
96.33
44.23
710.00
145.70
96.93
48.78

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 21
Stage -Area -Storage for Pond 13P: POND 1
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.00
22,606
0
701.10
23,399
2,300
701.20
24,191
4,680
701.30
24,984
7,138
701.40
25,776
9,676
701.50
26,569
12,294
701.60
27,362
14,990
701.70
28,154
17,766
701.80
28,947
20,621
701.90
29,739
23,555
702.00
30,532
26,569
702.10
30,812
29,636
702.20
31,092
32,731
702.30
31,373
35,855
702.40
31,653
39,006
702.50
31,933
42,185
702.60
32,213
45,393
702.70
32,493
48,628
702.80
32,774
51,891
702.90
33,054
55,183
703.00
33,334
58,502
703.10
33,638
61,851
703.20
33,943
65,230
703.30
34,247
68,639
703.40
34,552
72,079
703.50
34,856
75,550
703.60
35,160
79,050
703.70
35,465
82,582
703.80
35,769
86,143
703.90
36,074
89,735
704.00
36,378
93,358
704.10
36,713
97,013
704.20
37,049
100,701
704.30
37,384
104,422
704.40
37,720
108,178
704.50
38,055
111,966
704.60
38,390
115,789
704.70
38,726
119,644
704.80
39,061
123,534
704.90
39,397
127,457
705.00
39,732
131,413
705.10
40,158
135,407
705.20
40,583
139,445
705.30
41,009
143,524
705.40
41,434
147,646
705.50
41,860
151,811
705.60
42,286
156,018
705.70
42,711
160,268
705.80
43,137
164,561
705.90
43,562
168,895
706.00
43,988
173,273
706.10
44,508
177,698
706.20
45,028
182,175
706.30
45,548
186,703
706.40
46,068
191,284
706.50
46,588
195,917
706.60
47,107
200,602
706.70
47,627
205,338
706.80
48,147
210,127
706.90
48,667
214,968
707.00
49,187
219,861
707.10
49,750
224,807
707.20
50,313
229,811
707.30
50,876
234,870
707.40
51,439
239,986
707.50
52.003
245.158
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
707.60
52,566
250,386
707.70
53,129
255,671
707.80
53,692
261,012
707.90
54,255
266,409
708.00
54,818
271,863
708.10
55,399
277,374
708.20
55,979
282,943
708.30
56,560
288,570
708.40
57,140
294,255
708.50
57,721
299,998
708.60
58,302
305,799
708.70
58,882
311,658
708.80
59,463
317,575
708.90
60,043
323,551
709.00
60,624
329,584
709.10
61,228
335,677
709.20
61,832
341,830
709.30
62,435
348,043
709.40
63,039
354,317
709.50
63,643
360,651
709.60
64,247
367,045
709.70
64,851
373,500
709.80
65,454
380,015
709.90
66,058
386,591
710.00
66,662
393,227

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 22
Summary for Pond 15P: POND 6
Inflow Area = 13.860 ac, 74.39% Impervious, Inflow Depth = 4.64" for 25yr-24hr event
Inflow = 107.56 cfs @ 11.95 hrs, Volume= 5.358 of
Outflow = 17.74 cfs @ 12.15 hrs, Volume= 5.345 af, Atten= 84%, Lag= 11.7 min
Primary = 17.74 cfs @ 12.15 hrs, Volume= 5.345 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 680.59' @ 12.15 hrs Surf.Area= 38,868 sf Storage= 118,669 cf
Plug -Flow detention time= 287.8 min calculated for 5.343 of (100% of inflow)
Center -of -Mass det. time= 288.4 min ( 1,072.9 - 784.6 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
270,951 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
27,493
0 0
678.00
30,495
28,994 28,994
679.00
33,652
32,074 61,068
680.00
36,914
35,283 96,351
681.00
40,232
38,573 134,924
682.00
43,608
41,920 176,844
683.00
47,039
45,324 222,167
684.00
50,528
48,784 270,951
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1
677.00'
10.0" Vert. 8" Orifice C= 0.600
#3 Device 1
680.00'
36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1
682.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
682.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=17.72 cfs @ 12.15 hrs HW=680.59' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 17.72 cfs of 50.75 cfs potential flow)
2=8" Orifice (Orifice Controls 4.68 cfs @ 8.58 fps)
3=Orifice/Grate (Orifice Controls 13.04 cfs @ 2.46 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type // 24-hr 25yr-24hr Rainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD® 10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 23
'0=6 1 gmMR097ki1•I:
.....
1
riflow Area=1318601
,'
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'St&ad&1 18.66a
�j
------------------------------

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 15P: POND 6
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.22
510
677.02
0.00
0.00
0.00
7.50
0.72
4,387
677.16
0.10
0.10
0.00
10.00
2.02
12,718
677.45
0.69
0.69
0.00
12.50
8.15
113,286
680.45
13.29
13.29
0.00
15.00
2.41
92,721
679.90
4.14
4.14
0.00
17.50
1.54
74,224
679.38
3.68
3.68
0.00
20.00
1.05
55,216
678.82
3.12
3.12
0.00
22.50
0.94
38,877
678.32
2.49
2.49
0.00
25.00
0.00
24,567
677.85
1.74
1.74
0.00
27.50
0.00
13,579
677.48
0.77
0.77
0.00
30.00
0.00
8,797
677.31
0.36
0.36
0.00
32.50
0.00
6,383
677.23
0.20
0.20
0.00
35.00
0.00
4,969
677.18
0.12
0.12
0.00
37.50
0.00
4,051
677.15
0.08
0.08
0.00
40.00
0.00
3,413
677.12
0.06
0.06
0.00
42.50
0.00
2,944
677.11
0.05
0.05
0.00
45.00
0.00
2,586
677.09
0.04
0.04
0.00
47.50
0.00
2,304
677.08
0.03
0.03
0.00
50.00
0.00
2,077
677.08
0.02
0.02
0.00
52.50
0.00
1,890
677.07
0.02
0.02
0.00
55.00
0.00
1,733
677.06
0.02
0.02
0.00
57.50
0.00
1,600
677.06
0.01
0.01
0.00
60.00
0.00
1,486
677.05
0.01
0.01
0.00
62.50
0.00
1,387
677.05
0.01
0.01
0.00
65.00
0.00
1,300
677.05
0.01
0.01
0.00
67.50
0.00
1,223
677.04
0.01
0.01
0.00
70.00
0.00
1,155
677.04
0.01
0.01
0.00
72.50
0.00
1,094
677.04
0.01
0.01
0.00
75.00
0.00
1,039
677.04
0.01
0.01
0.00
77.50
0.00
989
677.04
0.01
0.01
0.00
80.00
0.00
944
677.03
0.00
0.00
0.00
82.50
0.00
902
677.03
0.00
0.00
0.00
85.00
0.00
864
677.03
0.00
0.00
0.00
87.50
0.00
829
677.03
0.00
0.00
0.00
90.00
0.00
797
677.03
0.00
0.00
0.00
92.50
0.00
767
677.03
0.00
0.00
0.00
95.00
0.00
740
677.03
0.00
0.00
0.00
97.50
0.00
714
677.03
0.00
0.00
0.00
100.00
0.00
690
677.03
0.00
0.00
0.00
102.50
0.00
668
677.02
0.00
0.00
0.00
105.00
0.00
647
677.02
0.00
0.00
0.00
107.50
0.00
627
677.02
0.00
0.00
0.00
110.00
0.00
608
677.02
0.00
0.00
0.00
112.50
0.00
591
677.02
0.00
0.00
0.00
115.00
0.00
574
677.02
0.00
0.00
0.00
117.50
0.00
558
677.02
0.00
0.00
0.00
120.00
0.00
544
677.02
0.00
0.00
0.00
Type/1 24-hr 25yr-24hr Rainfall=5.90"
Printed 11/2/2022

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 25
Stage -Discharge for Pond 15P: POND 6
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.15
0.15
0.00
677.30
0.33
0.33
0.00
677.40
0.56
0.56
0.00
677.50
0.82
0.82
0.00
677.60
1.11
1.11
0.00
677.70
1.39
1.39
0.00
677.80
1.64
1.64
0.00
677.90
1.83
1.83
0.00
678.00
2.01
2.01
0.00
678.10
2.17
2.17
0.00
678.20
2.32
2.32
0.00
678.30
2.47
2.47
0.00
678.40
2.60
2.60
0.00
678.50
2.73
2.73
0.00
678.60
2.86
2.86
0.00
678.70
2.98
2.98
0.00
678.80
3.09
3.09
0.00
678.90
3.20
3.20
0.00
679.00
3.30
3.30
0.00
679.10
3.41
3.41
0.00
679.20
3.51
3.51
0.00
679.30
3.60
3.60
0.00
679.40
3.70
3.70
0.00
679.50
3.79
3.79
0.00
679.60
3.88
3.88
0.00
679.70
3.97
3.97
0.00
679.80
4.05
4.05
0.00
679.90
4.14
4.14
0.00
680.00
4.22
4.22
0.00
680.10
5.22
5.22
0.00
680.20
6.97
6.97
0.00
680.30
9.21
9.21
0.00
680.40
11.84
11.84
0.00
680.50
14.83
14.83
0.00
680.60
18.11
18.11
0.00
680.70
21.50
21.50
0.00
680.80
24.10
24.10
0.00
680.90
26.31
26.31
0.00
681.00
28.30
28.30
0.00
681.10
30.13
30.13
0.00
681.20
31.83
31.83
0.00
681.30
33.44
33.44
0.00
681.40
34.95
34.95
0.00
681.50
36.40
36.40
0.00
681.60
37.79
37.79
0.00
681.70
39.12
39.12
0.00
681.80
40.41
40.41
0.00
681.90
41.65
41.65
0.00
682.00
42.86
42.86
0.00
682.10
45.68
45.68
0.00
682.20
49.84
49.84
0.00
682.30
54.87
54.87
0.00
682.40
60.59
60.59
0.00
682.50
66.90
66.90
0.00
682.60
74.54
73.75
0.79
682.70
76.87
74.64
2.23
682.80
79.57
75.42
4.15
682.90
82.66
76.18
6.48
683.00
86.24
76.94
9.30
683.10
90.23
77.69
12.55
683.20
94.21
78.43
15.78
683.30
98.41
79.16
19.25
683.40
102.82
79.89
22.92
683.50
107.41
80.61
26.80
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
112.31
81.33
30.98
683.70
117.40
82.04
35.36
683.80
122.46
82.74
39.72
683.90
127.67
83.44
44.23
684.00
132.90
84.13
48.78

TriWest Building 2 SWM Type/1 24-hr 25yr-24hrRainfall=5.90"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 26
Stage -Area -Storage for Pond 15P: POND 6
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
27,493
0
677.10
27,793
2,764
677.20
28,093
5,559
677.30
28,394
8,383
677.40
28,694
11,237
677.50
28,994
14,122
677.60
29,294
17,036
677.70
29,594
19,981
677.80
29,895
22,955
677.90
30,195
25,960
678.00
30,495
28,994
678.10
30,811
32,059
678.20
31,126
35,156
678.30
31,442
38,285
678.40
31,758
41,445
678.50
32,074
44,636
678.60
32,389
47,859
678.70
32,705
51,114
678.80
33,021
54,400
678.90
33,336
57,718
679.00
33,652
61,068
679.10
33,978
64,449
679.20
34,304
67,863
679.30
34,631
71,310
679.40
34,957
74,789
679.50
35,283
78,301
679.60
35,609
81,846
679.70
35,935
85,423
679.80
36,262
89,033
679.90
36,588
92,675
680.00
36,914
96,351
680.10
37,246
100,058
680.20
37,578
103,800
680.30
37,909
107,574
680.40
38,241
111,382
680.50
38,573
115,222
680.60
38,905
119,096
680.70
39,237
123,003
680.80
39,568
126,943
680.90
39,900
130,917
681.00
40,232
134,924
681.10
40,570
138,964
681.20
40,907
143,037
681.30
41,245
147,145
681.40
41,582
151,286
681.50
41,920
155,462
681.60
42,258
159,670
681.70
42,595
163,913
681.80
42,933
168,189
681.90
43,270
172,500
682.00
43,608
176,844
682.10
43,951
181,221
682.20
44,294
185,634
682.30
44,637
190,080
682.40
44,980
194,561
682.50
45,324
199,076
682.60
45,667
203,626
682.70
46,010
208,210
682.80
46,353
212,828
682.90
46,696
217,480
683.00
47,039
222,167
683.10
47,388
226,888
683.20
47,737
231,645
683.30
48,086
236,436
683.40
48,435
241,262
683.50
48.784
246.123
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
49,132
251,018
683.70
49,481
255,949
683.80
49,830
260,915
683.90
50,179
265,915
684.00
50,528
270,951

OAK
E N G I N E E R I N G
HYDROCAD OUTPUT
50-YEAR, 24-HOUR STORM EVENT (PONDS ONLY)

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 1
Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method
Pond 2P: POND 2
Peak Elev=719.18' Storage=268,638 cf Inflow=244.25 cfs 12.390 of
Primary=44.84 cfs 12.119 of Secondary=15.04 cfs 0.258 of Outflow=59.88 cfs 12.378 of
Pond 8P: POND 3
Peak EIev=705.40' Storage=175,715 cf Inflow=134.13 cfs 6.693 of
Primary=7.88 cfs 6.652 of Secondary=0.00 cfs 0.000 of Outflow=7.88 cfs 6.652 of
Pond 10P: POND 4
Peak EIev=683.40' Storage=78,088 cf Inflow=91.42 cfs 4.529 of
Primary=37.26 cfs 4.528 of Secondary=0.00 cfs 0.000 of Outflow=37.26 cfs 4.528 of
Pond 13P: POND 1
Peak EIev=708.50' Storage=299,903 cf Inflow=279.70 cfs 14.188 of
Primary=67.85 cfs 14.178 of Secondary=0.00 cfs 0.000 of Outflow=67.85 cfs 14.178 of
Pond 15P: POND 6
Peak EIev=680.95' Storage=133,062 cf Inflow=123.47 cfs 6.210 of
Primary=27.41 cfs 6.197 of Secondary=0.00 cfs 0.000 of Outflow=27.41 cfs 6.197 of

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 2
Summary for Pond 2P: POND 2
Inflow Area = 27.080 ac, 79.03% Impervious, Inflow Depth = 5.49" for 50yr-24hr event
Inflow = 244.25 cfs @ 11.95 hrs, Volume= 12.390 of
Outflow = 59.88 cfs @ 12.11 hrs, Volume= 12.378 af, Atten= 75%, Lag= 9.3 min
Primary = 44.84 cfs @ 12.11 hrs, Volume= 12.119 of
Secondary = 15.04 cfs @ 12.11 hrs, Volume= 0.258 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 719.18' @ 12.11 hrs Surf.Area= 38,809 sf Storage= 268,638 cf
Plug -Flow detention time= 373.3 min calculated for 12.373 of (100% of inflow)
Center -of -Mass det. time= 374.6 min ( 1,151.7 - 777.1 )
Volume Invert
Avail.Storage Storage Description
#1 710.00'
301,329 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
710.00
20,568
0 0
711.00
22,310
21,439 21,439
712.00
24,113
23,212 44,651
713.00
25,975
25,044 69,695
714.00
27,897
26,936 96,631
715.00
29,879
28,888 125,519
716.00
31,920
30,900 156,418
717.00
34,021
32,971 189,389
718.00
36,183
35,102 224,491
719.00
38,404
37,294 261,784
720.00
40,686
39,545 301,329
Device Routing
Invert
Outlet Devices
#1 Primary
709.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 709.39' / 709.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
710.00'
6.0" Vert. 6" Orifice C= 0.600
#3 Device 1
715.00'
36.0" W x 6.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1
718.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
718.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=44.82 cfs @ 12.11 hrs HW=719.17' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Inlet Controls 44.82 cfs @ 14.27 fps)
2=6" Orifice (Passes < 2.82 cfs potential flow)
3=Orifice/Grate (Passes < 42.88 cfs potential flow)
=Top of OS (Passes < 66.07 cfs potential flow)
Secondary OutFlow Max=14.72 cfs @ 12.11 hrs HW=719.17' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway (Weir Controls 14.72 cfs @ 2.20 fps)

TriWest Building 2 SWM Type // 24-hr 50yr-24hr Rainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 3
'0 i glPAA14i
Hydrograph
244.25 Cfs
■Inflow
■Outflow
r-�--r-�--r-�--r-�--r-�--r-�--r--�--r-�--r-�--r-�--
Inflow
InflowIr�ea=271.OW ac
IN Primary
■Secondary
260
-�-
u
240
- -------------- ------ --------bra
te=268A38-cf-
220
-r-
200
r--r-r--r-r--r-r--r-r--r-r--r-r--r--i--r-r--r-r--r-r--
-�- �--Ir-�--Ir-�--r-�--Ir-�--Ir-�--Ir-�--Ir--li--r-�--Ir-�--r-�--
w 160
' 140
L120
L
- - J--L-J--L-1--r-J--r- --'--
-- - -- --'-- - -- - --r- --
100
59.88 cfs
--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--r-r--
80
- - -
44.84cfs
- - - - - -
60
40
15.04
0 5 1015 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 2P: POND 2
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
710.00
0.00
0.00
0.00
2.50
0.00
0
710.00
0.00
0.00
0.00
5.00
0.78
2,635
710.13
0.05
0.05
0.00
7.50
1.98
12,410
710.59
0.55
0.55
0.00
10.00
5.03
34,166
711.56
1.08
1.08
0.00
12.50
18.31
237,980
718.37
42.73
42.73
0.00
15.00
5.39
133,671
715.27
6.18
6.18
0.00
17.50
3.45
129,848
715.14
3.67
3.67
0.00
20.00
2.34
127,648
715.07
2.62
2.62
0.00
22.50
2.10
126,330
715.03
2.20
2.20
0.00
25.00
0.00
118,959
714.78
2.01
2.01
0.00
27.50
0.00
101,475
714.17
1.87
1.87
0.00
30.00
0.00
85,273
713.59
1.73
1.73
0.00
32.50
0.00
70,407
713.03
1.58
1.58
0.00
35.00
0.00
56,931
712.50
1.42
1.42
0.00
37.50
0.00
44,901
712.01
1.25
1.25
0.00
40.00
0.00
34,370
711.57
1.08
1.08
0.00
42.50
0.00
25,391
711.18
0.91
0.91
0.00
45.00
0.00
18,011
710.85
0.73
0.73
0.00
47.50
0.00
12,272
710.58
0.55
0.55
0.00
50.00
0.00
8,209
710.39
0.35
0.35
0.00
52.50
0.00
5,785
710.28
0.20
0.20
0.00
55.00
0.00
4,366
710.21
0.12
0.12
0.00
57.50
0.00
3,471
710.17
0.08
0.08
0.00
60.00
0.00
2,866
710.14
0.06
0.06
0.00
62.50
0.00
2,433
710.12
0.04
0.04
0.00
65.00
0.00
2,109
710.10
0.03
0.03
0.00
67.50
0.00
1,859
710.09
0.02
0.02
0.00
70.00
0.00
1,661
710.08
0.02
0.02
0.00
72.50
0.00
1,500
710.07
0.02
0.02
0.00
75.00
0.00
1,367
710.07
0.01
0.01
0.00
77.50
0.00
1,255
710.06
0.01
0.01
0.00
80.00
0.00
1,159
710.06
0.01
0.01
0.00
82.50
0.00
1,077
710.05
0.01
0.01
0.00
85.00
0.00
1,006
710.05
0.01
0.01
0.00
87.50
0.00
943
710.05
0.01
0.01
0.00
90.00
0.00
888
710.04
0.01
0.01
0.00
92.50
0.00
838
710.04
0.01
0.01
0.00
95.00
0.00
794
710.04
0.00
0.00
0.00
97.50
0.00
754
710.04
0.00
0.00
0.00
100.00
0.00
718
710.03
0.00
0.00
0.00
102.50
0.00
685
710.03
0.00
0.00
0.00
105.00
0.00
655
710.03
0.00
0.00
0.00
107.50
0.00
628
710.03
0.00
0.00
0.00
110.00
0.00
603
710.03
0.00
0.00
0.00
112.50
0.00
579
710.03
0.00
0.00
0.00
115.00
0.00
558
710.03
0.00
0.00
0.00
117.50
0.00
538
710.03
0.00
0.00
0.00
120.00
0.00
519
710.03
0.00
0.00
0.00
Type/1 24-hr 50yr-24hr Rainfall=6.66"
Printed 11/2/2022

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 5
Stage -Discharge for Pond 2P: POND 2
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
710.00
0.00
0.00
0.00
710.10
0.03
0.03
0.00
710.20
0.11
0.11
0.00
710.30
0.23
0.23
0.00
710.40
0.36
0.36
0.00
710.50
0.47
0.47
0.00
710.60
0.56
0.56
0.00
710.70
0.63
0.63
0.00
710.80
0.70
0.70
0.00
710.90
0.76
0.76
0.00
711.00
0.82
0.82
0.00
711.10
0.87
0.87
0.00
711.20
0.92
0.92
0.00
711.30
0.97
0.97
0.00
711.40
1.01
1.01
0.00
711.50
1.06
1.06
0.00
711.60
1.10
1.10
0.00
711.70
1.14
1.14
0.00
711.80
1.18
1.18
0.00
711.90
1.21
1.21
0.00
712.00
1.25
1.25
0.00
712.10
1.29
1.29
0.00
712.20
1.32
1.32
0.00
712.30
1.35
1.35
0.00
712.40
1.39
1.39
0.00
712.50
1.42
1.42
0.00
712.60
1.45
1.45
0.00
712.70
1.48
1.48
0.00
712.80
1.51
1.51
0.00
712.90
1.54
1.54
0.00
713.00
1.57
1.57
0.00
713.10
1.60
1.60
0.00
713.20
1.62
1.62
0.00
713.30
1.65
1.65
0.00
713.40
1.68
1.68
0.00
713.50
1.70
1.70
0.00
713.60
1.73
1.73
0.00
713.70
1.76
1.76
0.00
713.80
1.78
1.78
0.00
713.90
1.81
1.81
0.00
714.00
1.83
1.83
0.00
714.10
1.86
1.86
0.00
714.20
1.88
1.88
0.00
714.30
1.90
1.90
0.00
714.40
1.93
1.93
0.00
714.50
1.95
1.95
0.00
714.60
1.97
1.97
0.00
714.70
1.99
1.99
0.00
714.80
2.02
2.02
0.00
714.90
2.04
2.04
0.00
715.00
2.06
2.06
0.00
715.10
3.00
3.00
0.00
715.20
4.69
4.69
0.00
715.30
6.87
6.87
0.00
715.40
9.45
9.45
0.00
715.50
12.38
12.38
0.00
715.60
14.70
14.70
0.00
715.70
16.54
16.54
0.00
715.80
18.15
18.15
0.00
715.90
19.61
19.61
0.00
716.00
20.94
20.94
0.00
716.10
22.19
22.19
0.00
716.20
23.36
23.36
0.00
716.30
24.47
24.47
0.00
716.40
25.53
25.53
0.00
716.50
26.55
26.55
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
716.60
27.52
27.52
0.00
716.70
28.46
28.46
0.00
716.80
29.37
29.37
0.00
716.90
30.24
30.24
0.00
717.00
31.10
31.10
0.00
717.10
31.92
31.92
0.00
717.20
32.73
32.73
0.00
717.30
33.51
33.51
0.00
717.40
34.28
34.28
0.00
717.50
35.03
35.03
0.00
717.60
35.76
35.76
0.00
717.70
36.48
36.48
0.00
717.80
37.18
37.18
0.00
717.90
37.87
37.87
0.00
718.00
38.55
38.55
0.00
718.10
40.87
40.87
0.00
718.20
42.27
42.27
0.00
718.30
42.54
42.54
0.00
718.40
42.81
42.81
0.00
718.50
43.08
43.08
0.00
718.60
44.13
43.34
0.79
718.70
45.83
43.61
2.23
718.80
48.02
43.87
4.15
718.90
50.60
44.13
6.48
719.00
53.68
44.39
9.30
719.10
57.19
44.64
12.55
719.20
60.68
44.90
15.78
719.30
64.40
45.15
19.25
719.40
68.33
45.41
22.92
719.50
72.46
45.66
26.80
719.60
76.88
45.91
30.98
719.70
81.52
46.16
35.36
719.80
86.13
46.40
39.72
719.90
90.88
46.65
44.23
720.00
95.67
46.89
48.78

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 6
Stage -Area -Storage for Pond 2P: POND 2
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
710.00
20,568
0
710.10
20,742
2,066
710.20
20,916
4,148
710.30
21,091
6,249
710.40
21,265
8,367
710.50
21,439
10,502
710.60
21,613
12,654
710.70
21,787
14,824
710.80
21,962
17,012
710.90
22,136
19,217
711.00
22,310
21,439
711.10
22,490
23,679
711.20
22,671
25,937
711.30
22,851
28,213
711.40
23,031
30,507
711.50
23,212
32,819
711.60
23,392
35,150
711.70
23,572
37,498
711.80
23,752
39,864
711.90
23,933
42,248
712.00
24,113
44,651
712.10
24,299
47,071
712.20
24,485
49,510
712.30
24,672
51,968
712.40
24,858
54,445
712.50
25,044
56,940
712.60
25,230
59,453
712.70
25,416
61,986
712.80
25,603
64,537
712.90
25,789
67,106
713.00
25,975
69,695
713.10
26,167
72,302
713.20
26,359
74,928
713.30
26,552
77,573
713.40
26,744
80,238
713.50
26,936
82,922
713.60
27,128
85,625
713.70
27,320
88,348
713.80
27,513
91,090
713.90
27,705
93,850
714.00
27,897
96,631
714.10
28,095
99,430
714.20
28,293
102,250
714.30
28,492
105,089
714.40
28,690
107,948
714.50
28,888
110,827
714.60
29,086
113,725
714.70
29,284
116,644
714.80
29,483
119,582
714.90
29,681
122,541
715.00
29,879
125,519
715.10
30,083
128,517
715.20
30,287
131,535
715.30
30,491
134,574
715.40
30,695
137,633
715.50
30,900
140,713
715.60
31,104
143,813
715.70
31,308
146,934
715.80
31,512
150,075
715.90
31,716
153,236
716.00
31,920
156,418
716.10
32,130
159,621
716.20
32,340
162,844
716.30
32,550
166,089
716.40
32,760
169,354
716.50
32.971
172.641
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
716.60
33,181
175,948
716.70
33,391
179,277
716.80
33,601
182,626
716.90
33,811
185,997
717.00
34,021
189,389
717.10
34,237
192,801
717.20
34,453
196,236
717.30
34,670
199,692
717.40
34,886
203,170
717.50
35,102
206,669
717.60
35,318
210,190
717.70
35,534
213,733
717.80
35,751
217,297
717.90
35,967
220,883
718.00
36,183
224,491
718.10
36,405
228,120
718.20
36,627
231,772
718.30
36,849
235,445
718.40
37,071
239,141
718.50
37,294
242,860
718.60
37,516
246,600
718.70
37,738
250,363
718.80
37,960
254,148
718.90
38,182
257,955
719.00
38,404
261,784
719.10
38,632
265,636
719.20
38,860
269,510
719.30
39,089
273,408
719.40
39,317
277,328
719.50
39,545
281,271
719.60
39,773
285,237
719.70
40,001
289,226
719.80
40,230
293,237
719.90
40,458
297,272
720.00
40,686
301,329

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 7
Summary for Pond 8P: POND 3
Inflow Area = 15.260 ac, 72.15% Impervious, Inflow Depth = 5.26" for 50yr-24hr event
Inflow = 134.13 cfs @ 11.95 hrs, Volume= 6.693 of
Outflow = 7.88 cfs @ 12.70 hrs, Volume= 6.652 af, Atten= 94%, Lag= 44.6 min
Primary = 7.88 cfs @ 12.70 hrs, Volume= 6.652 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 705.40' @ 12.70 hrs Surf.Area= 59,680 sf Storage= 175,715 cf
Plug -Flow detention time= 675.7 min calculated for 6.652 of (99% of inflow)
Center -of -Mass det. time= 671.7 min ( 1,455.5 - 783.8 )
Volume Invert
Avail.Storage Storage Description
#1 702.00'
503,002 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
702.00
43,792
0 0
703.00
48,320
46,056 46,056
704.00
52,961
50,641 96,697
705.00
57,717
55,339 152,036
706.00
62,582
60,150 212,185
707.00
67,552
65,067 277,252
708.00
72,628
70,090 347,342
709.00
77,809
75,219 422,561
710.00
83,074
80,442 503,002
Device Routing
Invert
Outlet Devices
#1 Primary
701.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 701.39' / 701.00' S= 0.0050 T Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
702.00'
8.0" Vert. 8" Orifice C= 0.600
#3 Device 1
705.00'
36.0" W x 6.0" H Vert. Orifice/Grate X 2.00 C= 0.600
#4 Device 1
708.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
708.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=7.88 cfs @ 12.70 hrs HW=705.40' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 7.88 cfs of 25.59 cfs potential flow)
2=8" Orifice (Orifice Controls 2.94 cfs @ 8.44 fps)
3=Orifice/Grate (Orifice Controls 4.93 cfs @ 2.04 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=702.00' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type // 24-hr 50yr-24hr Rainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 8
Hydrograph
134.13 CfS
-
--
-
--
-
--
-
----
--
- -- ---- - -- - -- - -- ■ Inflow
■Outflow
-
-
--L-J--L-L--
-
--
-
--'--
-- - -- --'-- - -- -- -L-L--
Inflow IAr�ea=�1151.2W ac ■ Primary
150
■Secondary
140-
130
-
-
--
-
--
-
--L-
--
-
----
--
- ----L -
Sorage�l7?1 cf -
f
120
11
11 W-1 I I
110
-1---I1-1--I1---r-1--I1-;--II
--1--I1-1--I1----r-1--I1-1--r-�--
100
-
-
--
-
--
-
--L-
--
-
--I--
--
- ----I--L- -- - --L- --
90
wI
-L-
L--L-L--L-L--L-L--L-L--I--L--L-L--L--I--L-L--L-L--L-L--
u 80
I
I
I
I
I
I
I
I
I I
I
I I I I I I I I I I
-I-
3 70
-
1 -
-
- r-
r- -
1 -
- 1 -
1 -
- 1 -
1 - -I -
-
- 1 - 1 - - 1 - - - - 1 - 1 - - 1 - 1 - - 1 - 1 - -
LL 60
-
-
--
-
--
-
--L-
--
-
--I--
--
- ----I--L- -- - --L- --
50
-L-
L--L-L--L-L--L-L--L-L--I--L--L-L--L--I--L-L--L-L--L-L--
40
30
7.88 Cfs
20
0.00 Cfs
0
0
5 10 15
20 25
30
35
40
45
50
55
60
65
70 75
80
85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 8P: POND 3
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
702.00
0.00
0.00
0.00
2.50
0.00
0
702.00
0.00
0.00
0.00
5.00
0.29
709
702.02
0.00
0.00
0.00
7.50
0.92
5,872
702.13
0.06
0.06
0.00
10.00
2.55
18,135
702.41
0.48
0.48
0.00
12.50
10.15
175,100
705.39
7.69
7.69
0.00
15.00
3.00
162,586
705.18
4.32
4.32
0.00
17.50
1.92
152,991
705.02
2.79
2.79
0.00
20.00
1.31
143,088
704.84
2.66
2.66
0.00
22.50
1.17
130,725
704.62
2.54
2.54
0.00
25.00
0.00
114,875
704.34
2.38
2.38
0.00
27.50
0.00
94,518
703.96
2.14
2.14
0.00
30.00
0.00
76,328
703.61
1.90
1.90
0.00
32.50
0.00
60,375
703.29
1.65
1.65
0.00
35.00
0.00
46,724
703.01
1.39
1.39
0.00
37.50
0.00
35,437
702.78
1.12
1.12
0.00
40.00
0.00
26,547
702.59
0.85
0.85
0.00
42.50
0.00
20,192
702.45
0.57
0.57
0.00
45.00
0.00
15,932
702.36
0.39
0.39
0.00
47.50
0.00
13,007
702.29
0.27
0.27
0.00
50.00
0.00
10,919
702.25
0.20
0.20
0.00
52.50
0.00
9,371
702.21
0.15
0.15
0.00
55.00
0.00
8,187
702.19
0.12
0.12
0.00
57.50
0.00
7,256
702.16
0.09
0.09
0.00
60.00
0.00
6,507
702.15
0.08
0.08
0.00
62.50
0.00
5,893
702.13
0.06
0.06
0.00
65.00
0.00
5,381
702.12
0.05
0.05
0.00
67.50
0.00
4,948
702.11
0.04
0.04
0.00
70.00
0.00
4,578
702.10
0.04
0.04
0.00
72.50
0.00
4,258
702.10
0.03
0.03
0.00
75.00
0.00
3,979
702.09
0.03
0.03
0.00
77.50
0.00
3,733
702.08
0.03
0.03
0.00
80.00
0.00
3,515
702.08
0.02
0.02
0.00
82.50
0.00
3,321
702.08
0.02
0.02
0.00
85.00
0.00
3,147
702.07
0.02
0.02
0.00
87.50
0.00
2,989
702.07
0.02
0.02
0.00
90.00
0.00
2,847
702.06
0.02
0.02
0.00
92.50
0.00
2,717
702.06
0.01
0.01
0.00
95.00
0.00
2,598
702.06
0.01
0.01
0.00
97.50
0.00
2,489
702.06
0.01
0.01
0.00
100.00
0.00
2,389
702.05
0.01
0.01
0.00
102.50
0.00
2,297
702.05
0.01
0.01
0.00
105.00
0.00
2,211
702.05
0.01
0.01
0.00
107.50
0.00
2,131
702.05
0.01
0.01
0.00
110.00
0.00
2,057
702.05
0.01
0.01
0.00
112.50
0.00
1,988
702.05
0.01
0.01
0.00
115.00
0.00
1,923
702.04
0.01
0.01
0.00
117.50
0.00
1,862
702.04
0.01
0.01
0.00
120.00
0.00
1,805
702.04
0.01
0.01
0.00
Type/1 24-hr 50yr-24hr Rainfall=6.66"
Printed 11/2/2022

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 10
Stage -Discharge for Pond 8P: POND 3
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
702.00
0.00
0.00
0.00
702.10
0.04
0.04
0.00
702.20
0.13
0.13
0.00
702.30
0.28
0.28
0.00
702.40
0.47
0.47
0.00
702.50
0.68
0.68
0.00
702.60
0.87
0.87
0.00
702.70
1.02
1.02
0.00
702.80
1.15
1.15
0.00
702.90
1.27
1.27
0.00
703.00
1.37
1.37
0.00
703.10
1.47
1.47
0.00
703.20
1.56
1.56
0.00
703.30
1.65
1.65
0.00
703.40
1.74
1.74
0.00
703.50
1.82
1.82
0.00
703.60
1.89
1.89
0.00
703.70
1.96
1.96
0.00
703.80
2.04
2.04
0.00
703.90
2.10
2.10
0.00
704.00
2.17
2.17
0.00
704.10
2.23
2.23
0.00
704.20
2.30
2.30
0.00
704.30
2.36
2.36
0.00
704.40
2.42
2.42
0.00
704.50
2.47
2.47
0.00
704.60
2.53
2.53
0.00
704.70
2.59
2.59
0.00
704.80
2.64
2.64
0.00
704.90
2.69
2.69
0.00
705.00
2.74
2.74
0.00
705.10
3.40
3.40
0.00
705.20
4.57
4.57
0.00
705.30
6.06
6.06
0.00
705.40
7.82
7.82
0.00
705.50
9.80
9.80
0.00
705.60
11.38
11.38
0.00
705.70
12.64
12.64
0.00
705.80
13.75
13.75
0.00
705.90
14.75
14.75
0.00
706.00
15.67
15.67
0.00
706.10
16.53
16.53
0.00
706.20
17.34
17.34
0.00
706.30
18.11
18.11
0.00
706.40
18.85
18.85
0.00
706.50
19.55
19.55
0.00
706.60
20.23
20.23
0.00
706.70
20.88
20.88
0.00
706.80
21.52
21.52
0.00
706.90
22.13
22.13
0.00
707.00
22.72
22.72
0.00
707.10
23.30
23.30
0.00
707.20
23.87
23.87
0.00
707.30
24.41
24.41
0.00
707.40
24.95
24.95
0.00
707.50
25.48
25.48
0.00
707.60
25.99
25.99
0.00
707.70
26.49
26.49
0.00
707.80
26.99
26.99
0.00
707.90
27.47
27.47
0.00
708.00
27.95
27.95
0.00
708.10
30.07
30.07
0.00
708.20
33.55
33.55
0.00
708.30
36.77
36.77
0.00
708.40
37.08
37.08
0.00
708.50
37.39
37.39
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
708.60
38.48
37.70
0.79
708.70
40.22
38.00
2.23
708.80
42.45
38.30
4.15
708.90
45.07
38.60
6.48
709.00
48.19
38.89
9.30
709.10
51.73
39.18
12.55
709.20
55.26
39.47
15.78
709.30
59.01
39.76
19.25
709.40
62.97
40.05
22.92
709.50
67.13
40.33
26.80
709.60
71.59
40.62
30.98
709.70
76.26
40.90
35.36
709.80
80.90
41.18
39.72
709.90
85.68
41.45
44.23
710.00
90.50
41.73
48.78

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 11
Stage -Area -Storage for Pond 8P: POND 3
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
702.00
43,792
0
702.10
44,245
4,402
702.20
44,698
8,849
702.30
45,150
13,341
702.40
45,603
17,879
702.50
46,056
22,462
702.60
46,509
27,090
702.70
46,962
31,764
702.80
47,414
36,483
702.90
47,867
41,247
703.00
48,320
46,056
703.10
48,784
50,911
703.20
49,248
55,813
703.30
49,712
60,761
703.40
50,176
65,755
703.50
50,641
70,796
703.60
51,105
75,883
703.70
51,569
81,017
703.80
52,033
86,197
703.90
52,497
91,424
704.00
52,961
96,697
704.10
53,437
102,016
704.20
53,912
107,384
704.30
54,388
112,799
704.40
54,863
118,261
704.50
55,339
123,772
704.60
55,815
129,329
704.70
56,290
134,934
704.80
56,766
140,587
704.90
57,241
146,288
705.00
57,717
152,036
705.10
58,204
157,832
705.20
58,690
163,676
705.30
59,176
169,570
705.40
59,663
175,511
705.50
60,150
181,502
705.60
60,636
187,541
705.70
61,123
193,629
705.80
61,609
199,766
705.90
62,095
205,951
706.00
62,582
212,185
706.10
63,079
218,468
706.20
63,576
224,801
706.30
64,073
231,183
706.40
64,570
237,615
706.50
65,067
244,097
706.60
65,564
250,629
706.70
66,061
257,210
706.80
66,558
263,841
706.90
67,055
270,522
707.00
67,552
277,252
707.10
68,060
284,033
707.20
68,567
290,864
707.30
69,075
297,746
707.40
69,582
304,679
707.50
70,090
311,663
707.60
70,598
318,697
707.70
71,105
325,782
707.80
71,613
332,918
707.90
72,120
340,105
708.00
72,628
347,342
708.10
73,146
354,631
708.20
73,664
361,971
708.30
74,182
369,364
708.40
74,700
376,808
708.50
75.219
384.304
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
708.60
75,737
391,851
708.70
76,255
399,451
708.80
76,773
407,102
708.90
77,291
414,806
709.00
77,809
422,561
709.10
78,336
430,368
709.20
78,862
438,228
709.30
79,388
446,140
709.40
79,915
454,105
709.50
80,442
462,123
709.60
80,968
470,194
709.70
81,495
478,317
709.80
82,021
486,492
709.90
82,547
494,721
710.00
83,074
503,002

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 12
Summary for Pond 10P: POND 4
Inflow Area
= 10.550 ac, 69.48% Impervious,
Inflow Depth = 5.15" for 50yr-24hr event
Inflow
= 91.42 cfs @ 11.95 hrs, Volume=
4.529 of
Outflow
= 37.26 cfs @ 12.07 hrs, Volume=
4.528 af, Atten= 59%, Lag= 7.2 min
Primary
= 37.26 cfs @ 12.07 hrs, Volume=
4.528 of
Secondary
= 0.00 cfs @ 0.00 hrs, Volume=
0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev=
683.40' @ 12.06 hrs Surf.Area= 23,193
sf Storage= 78,088 cf
Plug -Flow detention time= 133.0 min calculated for 4.526 of (100% of inflow)
Center -of -Mass det. time= 133.7 min ( 920.6 - 786.9 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
120,639 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
4,560
0 0
678.00
5,909
5,235 5,235
679.00
7,780
6,845 12,079
680.00
10,667
9,224 21,303
681.00
14,076
12,372 33,674
682.00
17,710
15,893 49,567
683.00
21,571
19,641 69,208
684.00
25,659
23,615 92,823
685.00
29,973
27,816 120,639
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 T Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
677.00'
8.0" Vert. 8" Orifice C= 0.600
#3 Device 1
682.50'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#4 Secondary
683.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=36.98 cfs @ 12.07 hrs HW=683.37' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Inlet Controls 36.98 cfs @ 11.77 fps)
2=8" Orifice (Passes < 4.13 cfs potential flow)
1
3=Top of OS (Passes < 42.13 cfs potential flow)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
4=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type // 24-hr 50yr-24hr Rainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 13
'0 i gM111111 191MI !
Hydrograph
91.42CfS
L-J--L-
--
-J--L-
----J--L-J--L----
-J--L---L-J--
-
IN Inflow
- -----------
r-
--r-,--r-
--
--r-
------
----
----�E}71rlre:�aJVra�v
--r- --r---r---- r-- -/ -- -
-
IN Outflow
■ Primary
100
- - --
- --
- --
- --
- ----
--
-
-- ---- �-1� - ----/y--
■ Secondary
95
- - --r-
--r-
--r-
--r--
90
85
- - --
-
- --
-
- --
-
- --
-
- ----
-
--
-SLtir
�� - - /�yy
e�7-8,088pf -
80
- - --r-
--r-
--r-
--r-
--r-
--r-
--r--i--r- --r- --r- --
75
-
-
-
-
-
-
-
- - - - -
70
- - --
- --
- --
- --
- ----
--
-
-- ---- - -- - -- - --
65
- - --Ir-
--Ir-
--r-
--Ir-
--Ir-
--Ir-
--Ir--li--r- --Ir- --r- --
w 60
--- ---
-
-
-
u 55
27
96-L-J--L-L--L-L--L-L----L--L-L--L----L-L--L-L--L-L--
3 50
, 37.26 cfs--�-�--�-,--�-�--�-,--�-,--�-�--�-�--�-�--�-,--r-,--
LL 45
40
L--L-J--L-L--L-L--L-L--'--L--L-L--L--'--L-L--L-L--L-L--
-
-
-
35
7--Ir-
--Ir-
--r-
--Ir-
--Ir-7--Ir-
--Ir--li--r- --Ir---r-7--
30
ZZ-
-
-
-
-
-
- - - -
25
--
- --
- --
--1--I---4-----1--I---1--L----I---1--I---4--I--1--
20
15
0.00 Cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 10P: POND 4
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.15
290
677.06
0.01
0.01
0.00
7.50
0.58
1,814
677.38
0.43
0.43
0.00
10.00
1.66
4,113
677.81
1.16
1.16
0.00
12.50
6.96
63,697
682.74
10.00
10.00
0.00
15.00
2.06
52,474
682.16
3.69
3.69
0.00
17.50
1.32
35,365
681.12
3.27
3.27
0.00
20.00
0.90
18,654
679.74
2.61
2.61
0.00
22.50
0.80
7,006
678.29
1.64
1.64
0.00
25.00
0.00
1,574
677.33
0.34
0.34
0.00
27.50
0.00
493
677.11
0.04
0.04
0.00
30.00
0.00
283
677.06
0.01
0.01
0.00
32.50
0.00
197
677.04
0.01
0.01
0.00
35.00
0.00
151
677.03
0.00
0.00
0.00
37.50
0.00
122
677.03
0.00
0.00
0.00
40.00
0.00
102
677.02
0.00
0.00
0.00
42.50
0.00
88
677.02
0.00
0.00
0.00
45.00
0.00
77
677.02
0.00
0.00
0.00
47.50
0.00
69
677.02
0.00
0.00
0.00
50.00
0.00
62
677.01
0.00
0.00
0.00
52.50
0.00
56
677.01
0.00
0.00
0.00
55.00
0.00
52
677.01
0.00
0.00
0.00
57.50
0.00
48
677.01
0.00
0.00
0.00
60.00
0.00
44
677.01
0.00
0.00
0.00
62.50
0.00
42
677.01
0.00
0.00
0.00
65.00
0.00
39
677.01
0.00
0.00
0.00
67.50
0.00
37
677.01
0.00
0.00
0.00
70.00
0.00
35
677.01
0.00
0.00
0.00
72.50
0.00
33
677.01
0.00
0.00
0.00
75.00
0.00
31
677.01
0.00
0.00
0.00
77.50
0.00
30
677.01
0.00
0.00
0.00
80.00
0.00
28
677.01
0.00
0.00
0.00
82.50
0.00
27
677.01
0.00
0.00
0.00
85.00
0.00
26
677.01
0.00
0.00
0.00
87.50
0.00
25
677.01
0.00
0.00
0.00
90.00
0.00
24
677.01
0.00
0.00
0.00
92.50
0.00
23
677.01
0.00
0.00
0.00
95.00
0.00
22
677.00
0.00
0.00
0.00
97.50
0.00
22
677.00
0.00
0.00
0.00
100.00
0.00
21
677.00
0.00
0.00
0.00
102.50
0.00
20
677.00
0.00
0.00
0.00
105.00
0.00
20
677.00
0.00
0.00
0.00
107.50
0.00
19
677.00
0.00
0.00
0.00
110.00
0.00
18
677.00
0.00
0.00
0.00
112.50
0.00
18
677.00
0.00
0.00
0.00
115.00
0.00
17
677.00
0.00
0.00
0.00
117.50
0.00
17
677.00
0.00
0.00
0.00
120.00
0.00
16
677.00
0.00
0.00
0.00
Type/1 24-hr 50yr-24hr Rainfall=6.66"
Printed 11/2/2022

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 15
Stage -Discharge for Pond 10P: POND 4
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.13
0.13
0.00
677.30
0.28
0.28
0.00
677.40
0.47
0.47
0.00
677.50
0.68
0.68
0.00
677.60
0.87
0.87
0.00
677.70
1.02
1.02
0.00
677.80
1.15
1.15
0.00
677.90
1.27
1.27
0.00
678.00
1.37
1.37
0.00
678.10
1.47
1.47
0.00
678.20
1.56
1.56
0.00
678.30
1.65
1.65
0.00
678.40
1.74
1.74
0.00
678.50
1.82
1.82
0.00
678.60
1.89
1.89
0.00
678.70
1.96
1.96
0.00
678.80
2.04
2.04
0.00
678.90
2.10
2.10
0.00
679.00
2.17
2.17
0.00
679.10
2.23
2.23
0.00
679.20
2.30
2.30
0.00
679.30
2.36
2.36
0.00
679.40
2.42
2.42
0.00
679.50
2.47
2.47
0.00
679.60
2.53
2.53
0.00
679.70
2.59
2.59
0.00
679.80
2.64
2.64
0.00
679.90
2.69
2.69
0.00
680.00
2.74
2.74
0.00
680.10
2.80
2.80
0.00
680.20
2.85
2.85
0.00
680.30
2.89
2.89
0.00
680.40
2.94
2.94
0.00
680.50
2.99
2.99
0.00
680.60
3.04
3.04
0.00
680.70
3.08
3.08
0.00
680.80
3.13
3.13
0.00
680.90
3.17
3.17
0.00
681.00
3.22
3.22
0.00
681.10
3.26
3.26
0.00
681.20
3.30
3.30
0.00
681.30
3.35
3.35
0.00
681.40
3.39
3.39
0.00
681.50
3.43
3.43
0.00
681.60
3.47
3.47
0.00
681.70
3.51
3.51
0.00
681.80
3.55
3.55
0.00
681.90
3.59
3.59
0.00
682.00
3.63
3.63
0.00
682.10
3.67
3.67
0.00
682.20
3.71
3.71
0.00
682.30
3.75
3.75
0.00
682.40
3.78
3.78
0.00
682.50
3.82
3.82
0.00
682.60
5.51
5.51
0.00
682.70
8.57
8.57
0.00
682.80
12.53
12.53
0.00
682.90
17.20
17.20
0.00
683.00
22.50
22.50
0.00
683.10
28.35
28.35
0.00
683.20
34.71
34.71
0.00
683.30
36.77
36.77
0.00
683.40
37.08
37.08
0.00
683.50
37.39
37.39
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
38.48
37.70
0.79
683.70
40.22
38.00
2.23
683.80
42.45
38.30
4.15
683.90
45.07
38.60
6.48
684.00
48.19
38.89
9.30
684.10
51.73
39.18
12.55
684.20
55.26
39.47
15.78
684.30
59.01
39.76
19.25
684.40
62.97
40.05
22.92
684.50
67.13
40.33
26.80
684.60
71.59
40.62
30.98
684.70
76.26
40.90
35.36
684.80
80.90
41.18
39.72
684.90
85.68
41.45
44.23
685.00
90.50
41.73
48.78

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 16
Stage -Area -Storage for Pond 10P: POND 4
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
4,560
0
677.10
4,695
463
677.20
4,830
939
677.30
4,965
1,429
677.40
5,100
1,932
677.50
5,235
2,449
677.60
5,369
2,979
677.70
5,504
3,523
677.80
5,639
4,080
677.90
5,774
4,650
678.00
5,909
5,235
678.10
6,096
5,835
678.20
6,283
6,454
678.30
6,470
7,091
678.40
6,657
7,748
678.50
6,845
8,423
678.60
7,032
9,117
678.70
7,219
9,829
678.80
7,406
10,560
678.90
7,593
11,310
679.00
7,780
12,079
679.10
8,069
12,871
679.20
8,357
13,693
679.30
8,646
14,543
679.40
8,935
15,422
679.50
9,224
16,330
679.60
9,512
17,267
679.70
9,801
18,232
679.80
10,090
19,227
679.90
10,378
20,250
680.00
10,667
21,303
680.10
11,008
22,386
680.20
11,349
23,504
680.30
11,690
24,656
680.40
12,031
25,842
680.50
12,372
27,062
680.60
12,712
28,316
680.70
13,053
29,605
680.80
13,394
30,927
680.90
13,735
32,283
681.00
14,076
33,674
681.10
14,439
35,100
681.20
14,803
36,562
681.30
15,166
38,060
681.40
15,530
39,595
681.50
15,893
41,166
681.60
16,256
42,774
681.70
16,620
44,418
681.80
16,983
46,098
681.90
17,347
47,814
682.00
17,710
49,567
682.10
18,096
51,357
682.20
18,482
53,186
682.30
18,868
55,054
682.40
19,254
56,960
682.50
19,641
58,905
682.60
20,027
60,888
682.70
20,413
62,910
682.80
20,799
64,971
682.90
21,185
67,070
683.00
21,571
69,208
683.10
21,980
71,385
683.20
22,389
73,603
683.30
22,797
75,863
683.40
23,206
78,163
683.50
23.615
80.504
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
24,024
82,886
683.70
24,433
85,309
683.80
24,841
87,772
683.90
25,250
90,277
684.00
25,659
92,823
684.10
26,090
95,410
684.20
26,522
98,041
684.30
26,953
100,714
684.40
27,385
103,431
684.50
27,816
106,191
684.60
28,247
108,994
684.70
28,679
111,841
684.80
29,110
114,730
684.90
29,542
117,663
685.00
29,973
120,639

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 17
Summary for Pond 13P: POND 1
Inflow Area = 31.010 ac, 78.30% Impervious, Inflow Depth = 5.49" for 50yr-24hr event
Inflow = 279.70 cfs @ 11.95 hrs, Volume= 14.188 of
Outflow = 67.85 cfs @ 12.11 hrs, Volume= 14.178 af, Atten= 76%, Lag= 9.3 min
Primary = 67.85 cfs @ 12.11 hrs, Volume= 14.178 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 708.50' @ 12.11 hrs Surf.Area= 57,712 sf Storage= 299,903 cf
Plug -Flow detention time= 275.8 min calculated for 14.178 of (100% of inflow)
Center -of -Mass det. time= 275.3 min ( 1,052.4 - 777.1 )
Volume
Invert Avail.Storage Storage Description
#1
701.00'
393,227 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.00
22,606
0
0
702.00
30,532
26,569
26,569
703.00
33,334
31,933
58,502
704.00
36,378
34,856
93,358
705.00
39,732
38,055
131,413
706.00
43,988
41,860
173,273
707.00
49,187
46,588
219,861
708.00
54,818
52,003
271,863
709.00
60,624
57,721
329,584
710.00
66,662
63,643
393,227
Device Routing Invert Outlet Devices
#1 Primary 700.39' 36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 700.39' / 700.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1 701.00' 10.0" Vert. 8" Orifice C= 0.600
#3 Device 1 706.00' 36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=67.32 cfs @ 12.11 hrs HW=708.49' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 67.32 cfs of 87.44 cfs potential flow)
2=8" Orifice (Orifice Controls 6.98 cfs @ 12.81 fps)
3=Orifice/Grate (Orifice Controls 42.38 cfs @ 7.06 fps)
=Top of OS (Weir Controls 17.95 cfs @ 2.29 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=701.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type // 24-hr 50yr-24hr Rainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 18
'0=6 1 gM10 141i
Hydrograph
279.70 CfS ---I--I---I--I---I--I---I--I---I--I---I--I-/�--I--I---I--I---I�-/-�I---I-
■inflow
■Outflow
- ----------------I--I-- --i
-1affDWAreiai r31I1:eI� 1aC -
■Primary
■ Secondary
280
- Pedk ]E1ew=II7'08:50
260
- - --r- --r- --r- --r- --r-
- - --' - --' - -- - --' ------1--'�-&olra
--ram --r--I--r-.yam-�r-�y--Syr---
lge=1 21 ,-30J-qIF-
240
- - J--L-J--L-1--L-J--L- --I--
-- - -- --I-- - -- - --L- --
220
200
- II- -I--; --I--; ---; --I--; ---;
--I--; --I--; --I--; --I--; ---; --I--
w180
- ---IF--1--IF-7--r--1--IF -1
--1--IF--1--IF----F -1 IF- --
- -r- --
u
160
0
LL
120
100
67.85 Cfs -I- --IIII--I, ---I, ----I, ---I,
----I, ----I, ----I, ----I, ---I --II--
80
--------I-- --, ----I-- --
- ----- ---- - --I --, ----I-- --, --I--
60
40
0.00
Cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 13P: POND 1
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.00
0.00
0.00
0.00
2.50
0.00
0
701.00
0.00
0.00
0.00
5.00
0.89
3,000
701.13
0.07
0.07
0.00
7.50
2.26
13,329
701.54
0.93
0.93
0.00
10.00
5.76
32,055
702.18
2.29
2.29
0.00
12.50
20.97
268,966
707.95
43.34
43.34
0.00
15.00
6.18
180,638
706.17
7.67
7.67
0.00
17.50
3.95
168,601
705.89
5.56
5.56
0.00
20.00
2.68
149,586
705.45
5.27
5.27
0.00
22.50
2.40
126,588
704.88
4.89
4.89
0.00
25.00
0.00
97,889
704.12
4.32
4.32
0.00
27.50
0.00
62,912
703.13
3.44
3.44
0.00
30.00
0.00
36,208
702.31
2.48
2.48
0.00
32.50
0.00
18,394
701.72
1.45
1.45
0.00
35.00
0.00
9,864
701.41
0.58
0.58
0.00
37.50
0.00
6,318
701.27
0.27
0.27
0.00
40.00
0.00
4,547
701.19
0.15
0.15
0.00
42.50
0.00
3,517
701.15
0.09
0.09
0.00
45.00
0.00
2,854
701.12
0.06
0.06
0.00
47.50
0.00
2,394
701.10
0.04
0.04
0.00
50.00
0.00
2,059
701.09
0.03
0.03
0.00
52.50
0.00
1,804
701.08
0.02
0.02
0.00
55.00
0.00
1,604
701.07
0.02
0.02
0.00
57.50
0.00
1,443
701.06
0.02
0.02
0.00
60.00
0.00
1,310
701.06
0.01
0.01
0.00
62.50
0.00
1,200
701.05
0.01
0.01
0.00
65.00
0.00
1,107
701.05
0.01
0.01
0.00
67.50
0.00
1,026
701.05
0.01
0.01
0.00
70.00
0.00
957
701.04
0.01
0.01
0.00
72.50
0.00
896
701.04
0.01
0.01
0.00
75.00
0.00
843
701.04
0.01
0.01
0.00
77.50
0.00
795
701.03
0.00
0.00
0.00
80.00
0.00
752
701.03
0.00
0.00
0.00
82.50
0.00
714
701.03
0.00
0.00
0.00
85.00
0.00
679
701.03
0.00
0.00
0.00
87.50
0.00
648
701.03
0.00
0.00
0.00
90.00
0.00
619
701.03
0.00
0.00
0.00
92.50
0.00
593
701.03
0.00
0.00
0.00
95.00
0.00
569
701.03
0.00
0.00
0.00
97.50
0.00
546
701.02
0.00
0.00
0.00
100.00
0.00
526
701.02
0.00
0.00
0.00
102.50
0.00
507
701.02
0.00
0.00
0.00
105.00
0.00
489
701.02
0.00
0.00
0.00
107.50
0.00
472
701.02
0.00
0.00
0.00
110.00
0.00
457
701.02
0.00
0.00
0.00
112.50
0.00
442
701.02
0.00
0.00
0.00
115.00
0.00
429
701.02
0.00
0.00
0.00
117.50
0.00
416
701.02
0.00
0.00
0.00
120.00
0.00
404
701.02
0.00
0.00
0.00
Type/1 24-hr 50yr-24hr Rainfall=6.66"
Printed 11/2/2022

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 20
Stage -Discharge for Pond 13P: POND 1
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.00
0.00
0.00
0.00
701.10
0.04
0.04
0.00
701.20
0.15
0.15
0.00
701.30
0.33
0.33
0.00
701.40
0.56
0.56
0.00
701.50
0.82
0.82
0.00
701.60
1.11
1.11
0.00
701.70
1.39
1.39
0.00
701.80
1.64
1.64
0.00
701.90
1.83
1.83
0.00
702.00
2.01
2.01
0.00
702.10
2.17
2.17
0.00
702.20
2.32
2.32
0.00
702.30
2.47
2.47
0.00
702.40
2.60
2.60
0.00
702.50
2.73
2.73
0.00
702.60
2.86
2.86
0.00
702.70
2.98
2.98
0.00
702.80
3.09
3.09
0.00
702.90
3.20
3.20
0.00
703.00
3.30
3.30
0.00
703.10
3.41
3.41
0.00
703.20
3.51
3.51
0.00
703.30
3.60
3.60
0.00
703.40
3.70
3.70
0.00
703.50
3.79
3.79
0.00
703.60
3.88
3.88
0.00
703.70
3.97
3.97
0.00
703.80
4.05
4.05
0.00
703.90
4.14
4.14
0.00
704.00
4.22
4.22
0.00
704.10
4.30
4.30
0.00
704.20
4.38
4.38
0.00
704.30
4.46
4.46
0.00
704.40
4.54
4.54
0.00
704.50
4.61
4.61
0.00
704.60
4.69
4.69
0.00
704.70
4.76
4.76
0.00
704.80
4.83
4.83
0.00
704.90
4.90
4.90
0.00
705.00
4.97
4.97
0.00
705.10
5.04
5.04
0.00
705.20
5.11
5.11
0.00
705.30
5.18
5.18
0.00
705.40
5.24
5.24
0.00
705.50
5.31
5.31
0.00
705.60
5.37
5.37
0.00
705.70
5.44
5.44
0.00
705.80
5.50
5.50
0.00
705.90
5.56
5.56
0.00
706.00
5.62
5.62
0.00
706.10
6.60
6.60
0.00
706.20
8.33
8.33
0.00
706.30
10.55
10.55
0.00
706.40
13.17
13.17
0.00
706.50
16.14
16.14
0.00
706.60
19.41
19.41
0.00
706.70
22.78
22.78
0.00
706.80
25.36
25.36
0.00
706.90
27.56
27.56
0.00
707.00
29.54
29.54
0.00
707.10
31.35
31.35
0.00
707.20
33.04
33.04
0.00
707.30
34.63
34.63
0.00
707.40
36.14
36.14
0.00
707.50
37.57
37.57
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
707.60
38.95
38.95
0.00
707.70
40.27
40.27
0.00
707.80
41.55
41.55
0.00
707.90
42.78
42.78
0.00
708.00
43.97
43.97
0.00
708.10
46.79
46.79
0.00
708.20
50.94
50.94
0.00
708.30
55.95
55.95
0.00
708.40
61.66
61.66
0.00
708.50
67.97
67.97
0.00
708.60
75.60
74.81
0.79
708.70
84.36
82.14
2.23
708.80
93.62
89.47
4.15
708.90
96.59
90.11
6.48
709.00
100.05
90.75
9.30
709.10
103.94
91.39
12.55
709.20
107.80
92.02
15.78
709.30
111.90
92.65
19.25
709.40
116.20
93.27
22.92
709.50
120.69
93.89
26.80
709.60
125.48
94.50
30.98
709.70
130.48
95.12
35.36
709.80
135.45
95.72
39.72
709.90
140.55
96.33
44.23
710.00
145.70
96.93
48.78

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 21
Stage -Area -Storage for Pond 13P: POND 1
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.00
22,606
0
701.10
23,399
2,300
701.20
24,191
4,680
701.30
24,984
7,138
701.40
25,776
9,676
701.50
26,569
12,294
701.60
27,362
14,990
701.70
28,154
17,766
701.80
28,947
20,621
701.90
29,739
23,555
702.00
30,532
26,569
702.10
30,812
29,636
702.20
31,092
32,731
702.30
31,373
35,855
702.40
31,653
39,006
702.50
31,933
42,185
702.60
32,213
45,393
702.70
32,493
48,628
702.80
32,774
51,891
702.90
33,054
55,183
703.00
33,334
58,502
703.10
33,638
61,851
703.20
33,943
65,230
703.30
34,247
68,639
703.40
34,552
72,079
703.50
34,856
75,550
703.60
35,160
79,050
703.70
35,465
82,582
703.80
35,769
86,143
703.90
36,074
89,735
704.00
36,378
93,358
704.10
36,713
97,013
704.20
37,049
100,701
704.30
37,384
104,422
704.40
37,720
108,178
704.50
38,055
111,966
704.60
38,390
115,789
704.70
38,726
119,644
704.80
39,061
123,534
704.90
39,397
127,457
705.00
39,732
131,413
705.10
40,158
135,407
705.20
40,583
139,445
705.30
41,009
143,524
705.40
41,434
147,646
705.50
41,860
151,811
705.60
42,286
156,018
705.70
42,711
160,268
705.80
43,137
164,561
705.90
43,562
168,895
706.00
43,988
173,273
706.10
44,508
177,698
706.20
45,028
182,175
706.30
45,548
186,703
706.40
46,068
191,284
706.50
46,588
195,917
706.60
47,107
200,602
706.70
47,627
205,338
706.80
48,147
210,127
706.90
48,667
214,968
707.00
49,187
219,861
707.10
49,750
224,807
707.20
50,313
229,811
707.30
50,876
234,870
707.40
51,439
239,986
707.50
52.003
245.158
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
707.60
52,566
250,386
707.70
53,129
255,671
707.80
53,692
261,012
707.90
54,255
266,409
708.00
54,818
271,863
708.10
55,399
277,374
708.20
55,979
282,943
708.30
56,560
288,570
708.40
57,140
294,255
708.50
57,721
299,998
708.60
58,302
305,799
708.70
58,882
311,658
708.80
59,463
317,575
708.90
60,043
323,551
709.00
60,624
329,584
709.10
61,228
335,677
709.20
61,832
341,830
709.30
62,435
348,043
709.40
63,039
354,317
709.50
63,643
360,651
709.60
64,247
367,045
709.70
64,851
373,500
709.80
65,454
380,015
709.90
66,058
386,591
710.00
66,662
393,227

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 22
Summary for Pond 15P: POND 6
Inflow Area = 13.860 ac, 74.39% Impervious, Inflow Depth = 5.38" for 50yr-24hr event
Inflow = 123.47 cfs @ 11.95 hrs, Volume= 6.210 of
Outflow = 27.41 cfs @ 12.11 hrs, Volume= 6.197 af, Atten= 78%, Lag= 9.7 min
Primary = 27.41 cfs @ 12.11 hrs, Volume= 6.197 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 680.95' @ 12.11 hrs Surf.Area= 40,078 sf Storage= 133,062 cf
Plug -Flow detention time= 267.3 min calculated for 6.197 of (100% of inflow)
Center -of -Mass det. time= 266.0 min ( 1,046.5 - 780.5 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
270,951 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
27,493
0 0
678.00
30,495
28,994 28,994
679.00
33,652
32,074 61,068
680.00
36,914
35,283 96,351
681.00
40,232
38,573 134,924
682.00
43,608
41,920 176,844
683.00
47,039
45,324 222,167
684.00
50,528
48,784 270,951
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1
677.00'
10.0" Vert. 8" Orifice C= 0.600
#3 Device 1
680.00'
36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1
682.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
682.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=27.24 cfs @ 12.11 hrs HW=680.95' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 27.24 cfs of 56.16 cfs potential flow)
2=8" Orifice (Orifice Controls 4.93 cfs @ 9.04 fps)
3=Orifice/Grate (Orifice Controls 22.30 cfs @ 3.72 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type // 24-hr 50yr-24hr Rainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 23
'0=6 1 gMMR0•]kiI1
.....
1 23.47 Cfs
IL
Inflow
_ _�__L
InflowIN
..1 IN Primary
El
•
u • 1 ••
•
• o - i .
•
••
••
:•
•
.•
•
•
•
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 15P: POND 6
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.33
963
677.03
0.01
0.01
0.00
7.50
0.92
5,955
677.21
0.17
0.17
0.00
10.00
2.44
15,444
677.55
0.95
0.95
0.00
12.50
9.30
119,422
680.61
18.40
18.40
0.00
15.00
2.74
94,772
679.96
4.19
4.19
0.00
17.50
1.75
77,929
679.49
3.78
3.78
0.00
20.00
1.19
59,451
678.95
3.25
3.25
0.00
22.50
1.07
42,933
678.45
2.67
2.67
0.00
25.00
0.00
27,667
677.96
1.93
1.93
0.00
27.50
0.00
14,994
677.53
0.91
0.91
0.00
30.00
0.00
9,447
677.34
0.41
0.41
0.00
32.50
0.00
6,736
677.24
0.22
0.22
0.00
35.00
0.00
5,187
677.19
0.13
0.13
0.00
37.50
0.00
4,198
677.15
0.09
0.09
0.00
40.00
0.00
3,517
677.13
0.06
0.06
0.00
42.50
0.00
3,022
677.11
0.05
0.05
0.00
45.00
0.00
2,646
677.10
0.04
0.04
0.00
47.50
0.00
2,352
677.09
0.03
0.03
0.00
50.00
0.00
2,116
677.08
0.02
0.02
0.00
52.50
0.00
1,922
677.07
0.02
0.02
0.00
55.00
0.00
1,761
677.06
0.02
0.02
0.00
57.50
0.00
1,624
677.06
0.01
0.01
0.00
60.00
0.00
1,506
677.05
0.01
0.01
0.00
62.50
0.00
1,404
677.05
0.01
0.01
0.00
65.00
0.00
1,315
677.05
0.01
0.01
0.00
67.50
0.00
1,237
677.04
0.01
0.01
0.00
70.00
0.00
1,167
677.04
0.01
0.01
0.00
72.50
0.00
1,105
677.04
0.01
0.01
0.00
75.00
0.00
1,049
677.04
0.01
0.01
0.00
77.50
0.00
998
677.04
0.01
0.01
0.00
80.00
0.00
952
677.03
0.00
0.00
0.00
82.50
0.00
910
677.03
0.00
0.00
0.00
85.00
0.00
871
677.03
0.00
0.00
0.00
87.50
0.00
836
677.03
0.00
0.00
0.00
90.00
0.00
803
677.03
0.00
0.00
0.00
92.50
0.00
773
677.03
0.00
0.00
0.00
95.00
0.00
745
677.03
0.00
0.00
0.00
97.50
0.00
719
677.03
0.00
0.00
0.00
100.00
0.00
694
677.03
0.00
0.00
0.00
102.50
0.00
672
677.02
0.00
0.00
0.00
105.00
0.00
650
677.02
0.00
0.00
0.00
107.50
0.00
630
677.02
0.00
0.00
0.00
110.00
0.00
612
677.02
0.00
0.00
0.00
112.50
0.00
594
677.02
0.00
0.00
0.00
115.00
0.00
577
677.02
0.00
0.00
0.00
117.50
0.00
561
677.02
0.00
0.00
0.00
120.00
0.00
546
677.02
0.00
0.00
0.00
Type/1 24-hr 50yr-24hr Rainfall=6.66"
Printed 11/2/2022

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 25
Stage -Discharge for Pond 15P: POND 6
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.15
0.15
0.00
677.30
0.33
0.33
0.00
677.40
0.56
0.56
0.00
677.50
0.82
0.82
0.00
677.60
1.11
1.11
0.00
677.70
1.39
1.39
0.00
677.80
1.64
1.64
0.00
677.90
1.83
1.83
0.00
678.00
2.01
2.01
0.00
678.10
2.17
2.17
0.00
678.20
2.32
2.32
0.00
678.30
2.47
2.47
0.00
678.40
2.60
2.60
0.00
678.50
2.73
2.73
0.00
678.60
2.86
2.86
0.00
678.70
2.98
2.98
0.00
678.80
3.09
3.09
0.00
678.90
3.20
3.20
0.00
679.00
3.30
3.30
0.00
679.10
3.41
3.41
0.00
679.20
3.51
3.51
0.00
679.30
3.60
3.60
0.00
679.40
3.70
3.70
0.00
679.50
3.79
3.79
0.00
679.60
3.88
3.88
0.00
679.70
3.97
3.97
0.00
679.80
4.05
4.05
0.00
679.90
4.14
4.14
0.00
680.00
4.22
4.22
0.00
680.10
5.22
5.22
0.00
680.20
6.97
6.97
0.00
680.30
9.21
9.21
0.00
680.40
11.84
11.84
0.00
680.50
14.83
14.83
0.00
680.60
18.11
18.11
0.00
680.70
21.50
21.50
0.00
680.80
24.10
24.10
0.00
680.90
26.31
26.31
0.00
681.00
28.30
28.30
0.00
681.10
30.13
30.13
0.00
681.20
31.83
31.83
0.00
681.30
33.44
33.44
0.00
681.40
34.95
34.95
0.00
681.50
36.40
36.40
0.00
681.60
37.79
37.79
0.00
681.70
39.12
39.12
0.00
681.80
40.41
40.41
0.00
681.90
41.65
41.65
0.00
682.00
42.86
42.86
0.00
682.10
45.68
45.68
0.00
682.20
49.84
49.84
0.00
682.30
54.87
54.87
0.00
682.40
60.59
60.59
0.00
682.50
66.90
66.90
0.00
682.60
74.54
73.75
0.79
682.70
76.87
74.64
2.23
682.80
79.57
75.42
4.15
682.90
82.66
76.18
6.48
683.00
86.24
76.94
9.30
683.10
90.23
77.69
12.55
683.20
94.21
78.43
15.78
683.30
98.41
79.16
19.25
683.40
102.82
79.89
22.92
683.50
107.41
80.61
26.80
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
112.31
81.33
30.98
683.70
117.40
82.04
35.36
683.80
122.46
82.74
39.72
683.90
127.67
83.44
44.23
684.00
132.90
84.13
48.78

TriWest Building 2 SWM Type // 24-hr 50yr-24hrRainfall=6.66"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 26
Stage -Area -Storage for Pond 15P: POND 6
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
27,493
0
677.10
27,793
2,764
677.20
28,093
5,559
677.30
28,394
8,383
677.40
28,694
11,237
677.50
28,994
14,122
677.60
29,294
17,036
677.70
29,594
19,981
677.80
29,895
22,955
677.90
30,195
25,960
678.00
30,495
28,994
678.10
30,811
32,059
678.20
31,126
35,156
678.30
31,442
38,285
678.40
31,758
41,445
678.50
32,074
44,636
678.60
32,389
47,859
678.70
32,705
51,114
678.80
33,021
54,400
678.90
33,336
57,718
679.00
33,652
61,068
679.10
33,978
64,449
679.20
34,304
67,863
679.30
34,631
71,310
679.40
34,957
74,789
679.50
35,283
78,301
679.60
35,609
81,846
679.70
35,935
85,423
679.80
36,262
89,033
679.90
36,588
92,675
680.00
36,914
96,351
680.10
37,246
100,058
680.20
37,578
103,800
680.30
37,909
107,574
680.40
38,241
111,382
680.50
38,573
115,222
680.60
38,905
119,096
680.70
39,237
123,003
680.80
39,568
126,943
680.90
39,900
130,917
681.00
40,232
134,924
681.10
40,570
138,964
681.20
40,907
143,037
681.30
41,245
147,145
681.40
41,582
151,286
681.50
41,920
155,462
681.60
42,258
159,670
681.70
42,595
163,913
681.80
42,933
168,189
681.90
43,270
172,500
682.00
43,608
176,844
682.10
43,951
181,221
682.20
44,294
185,634
682.30
44,637
190,080
682.40
44,980
194,561
682.50
45,324
199,076
682.60
45,667
203,626
682.70
46,010
208,210
682.80
46,353
212,828
682.90
46,696
217,480
683.00
47,039
222,167
683.10
47,388
226,888
683.20
47,737
231,645
683.30
48,086
236,436
683.40
48,435
241,262
683.50
48.784
246.123
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
49,132
251,018
683.70
49,481
255,949
683.80
49,830
260,915
683.90
50,179
265,915
684.00
50,528
270,951

OAK
E N G I N E E R I N G
HYDROCAD OUTPUT
100-YEAR, 24-HOUR STORM EVENT (PONDS ONLY)

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 1
Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method
Pond 2P: POND 2
Peak Elev=719.85' Storage=295,148 cf
Inflow=275.48 cfs 14.093 of
Primary=46.52 cfs 13.150 of Secondary=41.83 cfs 0.931 of
Outflow=88.35 cfs 14.081 of
Pond 8P: POND 3
Peak EIev=705.68' Storage=192,492 cf
Inflow=151.86 cfs 7.645 of
Primary=12.42 cfs 7.603 of Secondary=0.00 cfs 0.000 of
Outflow=12.42 cfs 7.603 of
Pond 10P: POND 4
Peak EIev=683.79' Storage=87,443 cf
Inflow=103.72 cfs 5.183 of
Primary=38.26 cfs 5.153 of Secondary=3.78 cfs 0.030 of
Outflow=42.04 cfs 5.183 of
Pond 13P: POND 1
Peak EIev=708.98' Storage=328,617 cf
Inflow=315.46 cfs 16.138 of
Primary=90.65 cfs 16.022 of Secondary=8.78 cfs 0.107 of
Outflow=99.43 cfs 16.129 of
Pond 15P: POND 6
Peak EIev=681.33' Storage=148,261 cf
Inflow=139.51 cfs 7.078 of
Primary=33.85 cfs 7.066 of Secondary=0.00 cfs 0.000 of
Outflow=33.85 cfs 7.066 of

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 2
Summary for Pond 2P: POND 2
Inflow Area = 27.080 ac, 79.03% Impervious, Inflow Depth = 6.25" for 100yr-24hr event
Inflow = 275.48 cfs @ 11.95 hrs, Volume= 14.093 of
Outflow = 88.35 cfs @ 12.08 hrs, Volume= 14.081 af, Atten= 68%, Lag= 7.8 min
Primary = 46.52 cfs @ 12.08 hrs, Volume= 13.150 of
Secondary = 41.83 cfs @ 12.08 hrs, Volume= 0.931 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 719.85' @ 12.08 hrs Surf.Area= 40,338 sf Storage= 295,148 cf
Plug -Flow detention time= 337.0 min calculated for 14.075 of (100% of inflow)
Center -of -Mass det. time= 338.3 min ( 1,112.0 - 773.7 )
Volume Invert
Avail.Storage Storage Description
#1 710.00'
301,329 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
710.00
20,568
0 0
711.00
22,310
21,439 21,439
712.00
24,113
23,212 44,651
713.00
25,975
25,044 69,695
714.00
27,897
26,936 96,631
715.00
29,879
28,888 125,519
716.00
31,920
30,900 156,418
717.00
34,021
32,971 189,389
718.00
36,183
35,102 224,491
719.00
38,404
37,294 261,784
720.00
40,686
39,545 301,329
Device Routing
Invert
Outlet Devices
#1 Primary
709.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 709.39' / 709.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
710.00'
6.0" Vert. 6" Orifice C= 0.600
#3 Device 1
715.00'
36.0" W x 6.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1
718.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
718.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=46.47 cfs @ 12.08 hrs HW=719.83' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Inlet Controls 46.47 cfs @ 14.79 fps)
2=6" Orifice (Passes < 2.93 cfs potential flow)
3=Orifice/Grate (Passes < 46.35 cfs potential flow)
=Top of OS (Passes < 104.13 cfs potential flow)
Secondary OutFlow Max=40.93 cfs @ 12.08 hrs HW=719.83' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway (Weir Controls 40.93 cfs @ 3.08 fps)

TriWest Building 2 SWM Type 1124-hr 100yr-24hr Rainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 3
'0=6 1 q1 AZOINIVIA
Hydrograph
-----------I----
275.48 Cfs r-y--r-
-------I------------------------I--
--r-y--r-y--r-y--r-y--r----r-y--r-y--r-y--
-- - ----
■Inflow
- - -- - --
- -- - -- - --I-
1 o—27'080 atv
N Outflow
■ Primary
300
- - J--L-J--L-
-- -J--L-----J--L-J--L--I--
Il1�eC
-J--L---L-J--
BeyV=�+7,1�'1e9.85_'
N Secondary
280
-
260
240
-;- --' - --'
- - -- - --
- --I - --' -;--'
- -- - -- - --I--
xPe'al�_
---IrStorate=295 .1114 -cf -
-- - -- --I-- - -- - -- - --
220
- - -- - --
- -- - -- - --I--
-- - -- --I-- - -- - -- - --
200
w 180
- -I--I- -I--I-
I I I I
-- -I--I- --I-
I I I I I I
-I--I- -I--I- -I-- -I--I- -- -I-
I I I I I I I I I I I I
w
160
-
0 140
FL88.35
Cfs-r-y--r-
--r-y--r-y--I--
--r-y--r----r-y--r-y--r- --
100
80
46.52 Cfs------'---r-------------'�---r------r-�--
60
41.83 Cfs
40
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 2P: POND 2
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
710.00
0.00
0.00
0.00
2.50
0.00
0
710.00
0.00
0.00
0.00
5.00
1.03
3,914
710.19
0.10
0.10
0.00
7.50
2.40
15,761
710.74
0.66
0.66
0.00
10.00
5.88
41,856
711.88
1.21
1.21
0.00
12.50
20.56
249,723
718.68
45.51
43.56
1.95
15.00
6.05
134,727
715.31
6.99
6.99
0.00
17.50
3.86
130,586
715.17
4.10
4.10
0.00
20.00
2.62
128,324
715.09
2.91
2.91
0.00
22.50
2.35
127,123
715.05
2.43
2.43
0.00
25.00
0.00
119,821
714.81
2.02
2.02
0.00
27.50
0.00
102,277
714.20
1.88
1.88
0.00
30.00
0.00
86,013
713.61
1.73
1.73
0.00
32.50
0.00
71,082
713.05
1.58
1.58
0.00
35.00
0.00
57,539
712.52
1.43
1.43
0.00
37.50
0.00
45,438
712.03
1.26
1.26
0.00
40.00
0.00
34,835
711.59
1.09
1.09
0.00
42.50
0.00
25,781
711.19
0.92
0.92
0.00
45.00
0.00
18,324
710.86
0.74
0.74
0.00
47.50
0.00
12,507
710.59
0.55
0.55
0.00
50.00
0.00
8,362
710.40
0.36
0.36
0.00
52.50
0.00
5,872
710.28
0.21
0.21
0.00
55.00
0.00
4,419
710.21
0.13
0.13
0.00
57.50
0.00
3,506
710.17
0.08
0.08
0.00
60.00
0.00
2,890
710.14
0.06
0.06
0.00
62.50
0.00
2,450
710.12
0.04
0.04
0.00
65.00
0.00
2,123
710.10
0.03
0.03
0.00
67.50
0.00
1,870
710.09
0.02
0.02
0.00
70.00
0.00
1,670
710.08
0.02
0.02
0.00
72.50
0.00
1,507
710.07
0.02
0.02
0.00
75.00
0.00
1,373
710.07
0.01
0.01
0.00
77.50
0.00
1,260
710.06
0.01
0.01
0.00
80.00
0.00
1,164
710.06
0.01
0.01
0.00
82.50
0.00
1,081
710.05
0.01
0.01
0.00
85.00
0.00
1,009
710.05
0.01
0.01
0.00
87.50
0.00
946
710.05
0.01
0.01
0.00
90.00
0.00
890
710.04
0.01
0.01
0.00
92.50
0.00
841
710.04
0.01
0.01
0.00
95.00
0.00
796
710.04
0.00
0.00
0.00
97.50
0.00
756
710.04
0.00
0.00
0.00
100.00
0.00
720
710.03
0.00
0.00
0.00
102.50
0.00
687
710.03
0.00
0.00
0.00
105.00
0.00
657
710.03
0.00
0.00
0.00
107.50
0.00
629
710.03
0.00
0.00
0.00
110.00
0.00
604
710.03
0.00
0.00
0.00
112.50
0.00
580
710.03
0.00
0.00
0.00
115.00
0.00
559
710.03
0.00
0.00
0.00
117.50
0.00
538
710.03
0.00
0.00
0.00
120.00
0.00
520
710.03
0.00
0.00
0.00
Type 1124-hr 100yr-24hr Rainfall=7.43"
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 5
Stage -Discharge for Pond 2P: POND 2
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
710.00
0.00
0.00
0.00
710.10
0.03
0.03
0.00
710.20
0.11
0.11
0.00
710.30
0.23
0.23
0.00
710.40
0.36
0.36
0.00
710.50
0.47
0.47
0.00
710.60
0.56
0.56
0.00
710.70
0.63
0.63
0.00
710.80
0.70
0.70
0.00
710.90
0.76
0.76
0.00
711.00
0.82
0.82
0.00
711.10
0.87
0.87
0.00
711.20
0.92
0.92
0.00
711.30
0.97
0.97
0.00
711.40
1.01
1.01
0.00
711.50
1.06
1.06
0.00
711.60
1.10
1.10
0.00
711.70
1.14
1.14
0.00
711.80
1.18
1.18
0.00
711.90
1.21
1.21
0.00
712.00
1.25
1.25
0.00
712.10
1.29
1.29
0.00
712.20
1.32
1.32
0.00
712.30
1.35
1.35
0.00
712.40
1.39
1.39
0.00
712.50
1.42
1.42
0.00
712.60
1.45
1.45
0.00
712.70
1.48
1.48
0.00
712.80
1.51
1.51
0.00
712.90
1.54
1.54
0.00
713.00
1.57
1.57
0.00
713.10
1.60
1.60
0.00
713.20
1.62
1.62
0.00
713.30
1.65
1.65
0.00
713.40
1.68
1.68
0.00
713.50
1.70
1.70
0.00
713.60
1.73
1.73
0.00
713.70
1.76
1.76
0.00
713.80
1.78
1.78
0.00
713.90
1.81
1.81
0.00
714.00
1.83
1.83
0.00
714.10
1.86
1.86
0.00
714.20
1.88
1.88
0.00
714.30
1.90
1.90
0.00
714.40
1.93
1.93
0.00
714.50
1.95
1.95
0.00
714.60
1.97
1.97
0.00
714.70
1.99
1.99
0.00
714.80
2.02
2.02
0.00
714.90
2.04
2.04
0.00
715.00
2.06
2.06
0.00
715.10
3.00
3.00
0.00
715.20
4.69
4.69
0.00
715.30
6.87
6.87
0.00
715.40
9.45
9.45
0.00
715.50
12.38
12.38
0.00
715.60
14.70
14.70
0.00
715.70
16.54
16.54
0.00
715.80
18.15
18.15
0.00
715.90
19.61
19.61
0.00
716.00
20.94
20.94
0.00
716.10
22.19
22.19
0.00
716.20
23.36
23.36
0.00
716.30
24.47
24.47
0.00
716.40
25.53
25.53
0.00
716.50
26.55
26.55
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
716.60
27.52
27.52
0.00
716.70
28.46
28.46
0.00
716.80
29.37
29.37
0.00
716.90
30.24
30.24
0.00
717.00
31.10
31.10
0.00
717.10
31.92
31.92
0.00
717.20
32.73
32.73
0.00
717.30
33.51
33.51
0.00
717.40
34.28
34.28
0.00
717.50
35.03
35.03
0.00
717.60
35.76
35.76
0.00
717.70
36.48
36.48
0.00
717.80
37.18
37.18
0.00
717.90
37.87
37.87
0.00
718.00
38.55
38.55
0.00
718.10
40.87
40.87
0.00
718.20
42.27
42.27
0.00
718.30
42.54
42.54
0.00
718.40
42.81
42.81
0.00
718.50
43.08
43.08
0.00
718.60
44.13
43.34
0.79
718.70
45.83
43.61
2.23
718.80
48.02
43.87
4.15
718.90
50.60
44.13
6.48
719.00
53.68
44.39
9.30
719.10
57.19
44.64
12.55
719.20
60.68
44.90
15.78
719.30
64.40
45.15
19.25
719.40
68.33
45.41
22.92
719.50
72.46
45.66
26.80
719.60
76.88
45.91
30.98
719.70
81.52
46.16
35.36
719.80
86.13
46.40
39.72
719.90
90.88
46.65
44.23
720.00
95.67
46.89
48.78

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 6
Stage -Area -Storage for Pond 2P: POND 2
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
710.00
20,568
0
710.10
20,742
2,066
710.20
20,916
4,148
710.30
21,091
6,249
710.40
21,265
8,367
710.50
21,439
10,502
710.60
21,613
12,654
710.70
21,787
14,824
710.80
21,962
17,012
710.90
22,136
19,217
711.00
22,310
21,439
711.10
22,490
23,679
711.20
22,671
25,937
711.30
22,851
28,213
711.40
23,031
30,507
711.50
23,212
32,819
711.60
23,392
35,150
711.70
23,572
37,498
711.80
23,752
39,864
711.90
23,933
42,248
712.00
24,113
44,651
712.10
24,299
47,071
712.20
24,485
49,510
712.30
24,672
51,968
712.40
24,858
54,445
712.50
25,044
56,940
712.60
25,230
59,453
712.70
25,416
61,986
712.80
25,603
64,537
712.90
25,789
67,106
713.00
25,975
69,695
713.10
26,167
72,302
713.20
26,359
74,928
713.30
26,552
77,573
713.40
26,744
80,238
713.50
26,936
82,922
713.60
27,128
85,625
713.70
27,320
88,348
713.80
27,513
91,090
713.90
27,705
93,850
714.00
27,897
96,631
714.10
28,095
99,430
714.20
28,293
102,250
714.30
28,492
105,089
714.40
28,690
107,948
714.50
28,888
110,827
714.60
29,086
113,725
714.70
29,284
116,644
714.80
29,483
119,582
714.90
29,681
122,541
715.00
29,879
125,519
715.10
30,083
128,517
715.20
30,287
131,535
715.30
30,491
134,574
715.40
30,695
137,633
715.50
30,900
140,713
715.60
31,104
143,813
715.70
31,308
146,934
715.80
31,512
150,075
715.90
31,716
153,236
716.00
31,920
156,418
716.10
32,130
159,621
716.20
32,340
162,844
716.30
32,550
166,089
716.40
32,760
169,354
716.50
32.971
172.641
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
716.60
33,181
175,948
716.70
33,391
179,277
716.80
33,601
182,626
716.90
33,811
185,997
717.00
34,021
189,389
717.10
34,237
192,801
717.20
34,453
196,236
717.30
34,670
199,692
717.40
34,886
203,170
717.50
35,102
206,669
717.60
35,318
210,190
717.70
35,534
213,733
717.80
35,751
217,297
717.90
35,967
220,883
718.00
36,183
224,491
718.10
36,405
228,120
718.20
36,627
231,772
718.30
36,849
235,445
718.40
37,071
239,141
718.50
37,294
242,860
718.60
37,516
246,600
718.70
37,738
250,363
718.80
37,960
254,148
718.90
38,182
257,955
719.00
38,404
261,784
719.10
38,632
265,636
719.20
38,860
269,510
719.30
39,089
273,408
719.40
39,317
277,328
719.50
39,545
281,271
719.60
39,773
285,237
719.70
40,001
289,226
719.80
40,230
293,237
719.90
40,458
297,272
720.00
40,686
301,329

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 7
Summary for Pond 8P: POND 3
Inflow Area = 15.260 ac, 72.15% Impervious, Inflow Depth = 6.01" for 100yr-24hr event
Inflow = 151.86 cfs @ 11.95 hrs, Volume= 7.645 of
Outflow = 12.42 cfs @ 12.46 hrs, Volume= 7.603 af, Atten= 92%, Lag= 30.5 min
Primary = 12.42 cfs @ 12.46 hrs, Volume= 7.603 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 705.68' @ 12.46 hrs Surf.Area= 61,032 sf Storage= 192,492 cf
Plug -Flow detention time= 615.9 min calculated for 7.600 of (99% of inflow)
Center -of -Mass det. time= 614.4 min ( 1,394.6 - 780.2 )
Volume Invert
Avail.Storage Storage Description
#1 702.00'
503,002 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
702.00
43,792
0 0
703.00
48,320
46,056 46,056
704.00
52,961
50,641 96,697
705.00
57,717
55,339 152,036
706.00
62,582
60,150 212,185
707.00
67,552
65,067 277,252
708.00
72,628
70,090 347,342
709.00
77,809
75,219 422,561
710.00
83,074
80,442 503,002
Device Routing
Invert
Outlet Devices
#1 Primary
701.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 701.39' / 701.00' S= 0.0050 T Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
702.00'
8.0" Vert. 8" Orifice C= 0.600
#3 Device 1
705.00'
36.0" W x 6.0" H Vert. Orifice/Grate X 2.00 C= 0.600
#4 Device 1
708.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
708.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=12.42 cfs @ 12.46 hrs HW=705.68' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Passes 12.42 cfs of 27.03 cfs potential flow)
2=8" Orifice (Orifice Controls 3.08 cfs @ 8.81 fps)
3=Orifice/Grate (Orifice Controls 9.34 cfs @ 3.11 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=702.00' TW=0.00' (Dynamic Tailwater)
5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type 1124-hr 100yr-24hr Rainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 8
Pond 8P: POND 3
Hydrograph
151.86
CfS
r---r-r--r-
--r-,--r-r--r-
--r----r---r-,--r-r--
■Inflow
-,-
r- --r-
--r-
--r-
--r-
--r-
--r-,--r
--r---r-7--�r/----r-7-C-r---/-�r-----
artfaow Are-a=,'��r260ra
■Outflow
■ Primary
170
r--r-
■Secondary
- -
---r- Pedk I=-Iew=7'05- 6
150
140
- -
7--r-7--r-r--r-7--r--1
--r-
--r-r--r-
--r-
1
rSt�r�--r--I--r-rA-.fir-r--r-r--
--r---orage;-19--2,492lcam -
130
- -
--r-
--r-
--r-
--r-
-- - --r-r--r----r-r--r-r--r-r--
120
- -
r--r-
--r-
--r-
--r-
--r-r--r---r--li--r- --r---r-r--
110
- -
--r-
--r-
--r-
--r-
-- - --r---r----r- --r- --r- --
100
w
-,-
-
-r-r--r
-r --r
---r-r--r-
--r---r----r---r-,--r- --
v 90
- -
--r-
--r-
--r-
--r-
--r- --r---r--li--r- --r- --r- --
0 80
-,-
r--r-
--r-
--r
-r--r
-,----r--r-r--r----r-r--r-,--r-r--
70
-r-
r-
-r-r-
-r
-,--r-r--r-r----r--r-r--r----r-r--r-r--r-r--
60
-,-
r--
r- r--r
- r--r
-r--r
-,--r-r--r---r----r---r-,--r-r--
50
- -
r--r-
--r-
--r-
--r-
--r-r--r---r--li--r- --r---r-r--
40
19 A9
rfq--r-
--r-r--r-r--r-r--r-r--r-r--r----r-r--r-r--r-r--
30
12.42 cfs
20
0.00 Cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM
Prepared by OAK Engineering, PLLC
HvdroCAD® 10.00-26 s/n 10066 © 2020 HvdroCAD Software Solutions LLC
Hydrograph for Pond 8P: POND 3
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
702.00
0.00
0.00
0.00
2.50
0.00
0
702.00
0.00
0.00
0.00
5.00
0.41
1,237
702.03
0.00
0.00
0.00
7.50
1.14
7,811
702.18
0.11
0.11
0.00
10.00
3.02
22,067
702.49
0.66
0.66
0.00
12.50
11.43
192,422
705.68
12.41
12.41
0.00
15.00
3.37
165,593
705.23
5.02
5.02
0.00
17.50
2.16
155,017
705.05
3.00
3.00
0.00
20.00
1.47
146,375
704.90
2.69
2.69
0.00
22.50
1.31
135,037
704.70
2.59
2.59
0.00
25.00
0.00
119,544
704.42
2.43
2.43
0.00
27.50
0.00
98,728
704.04
2.19
2.19
0.00
30.00
0.00
80,065
703.68
1.95
1.95
0.00
32.50
0.00
63,623
703.36
1.70
1.70
0.00
35.00
0.00
49,471
703.07
1.44
1.44
0.00
37.50
0.00
37,669
702.82
1.18
1.18
0.00
40.00
0.00
28,263
702.63
0.92
0.92
0.00
42.50
0.00
21,357
702.48
0.63
0.63
0.00
45.00
0.00
16,716
702.37
0.42
0.42
0.00
47.50
0.00
13,554
702.30
0.29
0.29
0.00
50.00
0.00
11,315
702.26
0.21
0.21
0.00
52.50
0.00
9,669
702.22
0.16
0.16
0.00
55.00
0.00
8,418
702.19
0.12
0.12
0.00
57.50
0.00
7,439
702.17
0.10
0.10
0.00
60.00
0.00
6,656
702.15
0.08
0.08
0.00
62.50
0.00
6,015
702.14
0.06
0.06
0.00
65.00
0.00
5,484
702.12
0.05
0.05
0.00
67.50
0.00
5,036
702.11
0.05
0.05
0.00
70.00
0.00
4,653
702.11
0.04
0.04
0.00
72.50
0.00
4,323
702.10
0.03
0.03
0.00
75.00
0.00
4,036
702.09
0.03
0.03
0.00
77.50
0.00
3,783
702.09
0.03
0.03
0.00
80.00
0.00
3,560
702.08
0.02
0.02
0.00
82.50
0.00
3,361
702.08
0.02
0.02
0.00
85.00
0.00
3,183
702.07
0.02
0.02
0.00
87.50
0.00
3,022
702.07
0.02
0.02
0.00
90.00
0.00
2,876
702.07
0.02
0.02
0.00
92.50
0.00
2,744
702.06
0.01
0.01
0.00
95.00
0.00
2,623
702.06
0.01
0.01
0.00
97.50
0.00
2,512
702.06
0.01
0.01
0.00
100.00
0.00
2,410
702.05
0.01
0.01
0.00
102.50
0.00
2,316
702.05
0.01
0.01
0.00
105.00
0.00
2,229
702.05
0.01
0.01
0.00
107.50
0.00
2,148
702.05
0.01
0.01
0.00
110.00
0.00
2,072
702.05
0.01
0.01
0.00
112.50
0.00
2,002
702.05
0.01
0.01
0.00
115.00
0.00
1,936
702.04
0.01
0.01
0.00
117.50
0.00
1,875
702.04
0.01
0.01
0.00
120.00
0.00
1,817
702.04
0.01
0.01
0.00
Type 1124-hr 100yr-24hr Rainfall=7.43"
Printed 11/2/2022

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 10
Stage -Discharge for Pond 8P: POND 3
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
702.00
0.00
0.00
0.00
702.10
0.04
0.04
0.00
702.20
0.13
0.13
0.00
702.30
0.28
0.28
0.00
702.40
0.47
0.47
0.00
702.50
0.68
0.68
0.00
702.60
0.87
0.87
0.00
702.70
1.02
1.02
0.00
702.80
1.15
1.15
0.00
702.90
1.27
1.27
0.00
703.00
1.37
1.37
0.00
703.10
1.47
1.47
0.00
703.20
1.56
1.56
0.00
703.30
1.65
1.65
0.00
703.40
1.74
1.74
0.00
703.50
1.82
1.82
0.00
703.60
1.89
1.89
0.00
703.70
1.96
1.96
0.00
703.80
2.04
2.04
0.00
703.90
2.10
2.10
0.00
704.00
2.17
2.17
0.00
704.10
2.23
2.23
0.00
704.20
2.30
2.30
0.00
704.30
2.36
2.36
0.00
704.40
2.42
2.42
0.00
704.50
2.47
2.47
0.00
704.60
2.53
2.53
0.00
704.70
2.59
2.59
0.00
704.80
2.64
2.64
0.00
704.90
2.69
2.69
0.00
705.00
2.74
2.74
0.00
705.10
3.40
3.40
0.00
705.20
4.57
4.57
0.00
705.30
6.06
6.06
0.00
705.40
7.82
7.82
0.00
705.50
9.80
9.80
0.00
705.60
11.38
11.38
0.00
705.70
12.64
12.64
0.00
705.80
13.75
13.75
0.00
705.90
14.75
14.75
0.00
706.00
15.67
15.67
0.00
706.10
16.53
16.53
0.00
706.20
17.34
17.34
0.00
706.30
18.11
18.11
0.00
706.40
18.85
18.85
0.00
706.50
19.55
19.55
0.00
706.60
20.23
20.23
0.00
706.70
20.88
20.88
0.00
706.80
21.52
21.52
0.00
706.90
22.13
22.13
0.00
707.00
22.72
22.72
0.00
707.10
23.30
23.30
0.00
707.20
23.87
23.87
0.00
707.30
24.41
24.41
0.00
707.40
24.95
24.95
0.00
707.50
25.48
25.48
0.00
707.60
25.99
25.99
0.00
707.70
26.49
26.49
0.00
707.80
26.99
26.99
0.00
707.90
27.47
27.47
0.00
708.00
27.95
27.95
0.00
708.10
30.07
30.07
0.00
708.20
33.55
33.55
0.00
708.30
36.77
36.77
0.00
708.40
37.08
37.08
0.00
708.50
37.39
37.39
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
708.60
38.48
37.70
0.79
708.70
40.22
38.00
2.23
708.80
42.45
38.30
4.15
708.90
45.07
38.60
6.48
709.00
48.19
38.89
9.30
709.10
51.73
39.18
12.55
709.20
55.26
39.47
15.78
709.30
59.01
39.76
19.25
709.40
62.97
40.05
22.92
709.50
67.13
40.33
26.80
709.60
71.59
40.62
30.98
709.70
76.26
40.90
35.36
709.80
80.90
41.18
39.72
709.90
85.68
41.45
44.23
710.00
90.50
41.73
48.78

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 11
Stage -Area -Storage for Pond 8P: POND 3
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
702.00
43,792
0
702.10
44,245
4,402
702.20
44,698
8,849
702.30
45,150
13,341
702.40
45,603
17,879
702.50
46,056
22,462
702.60
46,509
27,090
702.70
46,962
31,764
702.80
47,414
36,483
702.90
47,867
41,247
703.00
48,320
46,056
703.10
48,784
50,911
703.20
49,248
55,813
703.30
49,712
60,761
703.40
50,176
65,755
703.50
50,641
70,796
703.60
51,105
75,883
703.70
51,569
81,017
703.80
52,033
86,197
703.90
52,497
91,424
704.00
52,961
96,697
704.10
53,437
102,016
704.20
53,912
107,384
704.30
54,388
112,799
704.40
54,863
118,261
704.50
55,339
123,772
704.60
55,815
129,329
704.70
56,290
134,934
704.80
56,766
140,587
704.90
57,241
146,288
705.00
57,717
152,036
705.10
58,204
157,832
705.20
58,690
163,676
705.30
59,176
169,570
705.40
59,663
175,511
705.50
60,150
181,502
705.60
60,636
187,541
705.70
61,123
193,629
705.80
61,609
199,766
705.90
62,095
205,951
706.00
62,582
212,185
706.10
63,079
218,468
706.20
63,576
224,801
706.30
64,073
231,183
706.40
64,570
237,615
706.50
65,067
244,097
706.60
65,564
250,629
706.70
66,061
257,210
706.80
66,558
263,841
706.90
67,055
270,522
707.00
67,552
277,252
707.10
68,060
284,033
707.20
68,567
290,864
707.30
69,075
297,746
707.40
69,582
304,679
707.50
70,090
311,663
707.60
70,598
318,697
707.70
71,105
325,782
707.80
71,613
332,918
707.90
72,120
340,105
708.00
72,628
347,342
708.10
73,146
354,631
708.20
73,664
361,971
708.30
74,182
369,364
708.40
74,700
376,808
708.50
75.219
384.304
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
708.60
75,737
391,851
708.70
76,255
399,451
708.80
76,773
407,102
708.90
77,291
414,806
709.00
77,809
422,561
709.10
78,336
430,368
709.20
78,862
438,228
709.30
79,388
446,140
709.40
79,915
454,105
709.50
80,442
462,123
709.60
80,968
470,194
709.70
81,495
478,317
709.80
82,021
486,492
709.90
82,547
494,721
710.00
83,074
503,002

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 12
Summary for Pond 10P: POND 4
Inflow Area = 10.550 ac, 69.48% Impervious, Inflow Depth = 5.90" for 100yr-24hr event
Inflow = 103.72 cfs @ 11.95 hrs, Volume= 5.183 of
Outflow = 42.04 cfs @ 12.06 hrs, Volume= 5.183 af, Atten= 59%, Lag= 6.7 min
Primary = 38.26 cfs @ 12.07 hrs, Volume= 5.153 of
Secondary = 3.78 cfs @ 12.06 hrs, Volume= 0.030 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 683.79' @ 12.07 hrs Surf.Area= 24,787 sf Storage= 87,443 cf
Plug -Flow detention time= 126.1 min calculated for 5.181 of (100% of inflow)
Center -of -Mass det. time= 126.8 min ( 910.0 - 783.2 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
120,639 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
4,560
0 0
678.00
5,909
5,235 5,235
679.00
7,780
6,845 12,079
680.00
10,667
9,224 21,303
681.00
14,076
12,372 33,674
682.00
17,710
15,893 49,567
683.00
21,571
19,641 69,208
684.00
25,659
23,615 92,823
685.00
29,973
27,816 120,639
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
24.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 T Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#2 Device 1
677.00'
8.0" Vert. 8" Orifice C= 0.600
#3 Device 1
682.50'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#4 Secondary
683.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=38.18 cfs @ 12.07 hrs HW=683.76' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Inlet Controls 38.18 cfs @ 12.15 fps)
2=8" Orifice (Passes < 4.26 cfs potential flow)
1
3=Top of OS (Passes < 74.02 cfs potential flow)
Secondary OutFlow Max=3.37 cfs @ 12.06 hrs HW=683.76' TW=0.00' (Dynamic Tailwater)
4=Emergency Spillway (Weir Controls 3.37 cfs @ 1.29 fps)

TriWest Building 2 SWM Type 1124-hr 100yr-24hr Rainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 13
'0=6 1 gM11111 191MI !
Hydrograph
' 103.72 CfS
- --
- --
- --
- --
- --dry-
-- -- ---CC��-//-�� - --
IN Inflow
IN Outflow
---
----------
y--Ir-
--
------
----�Ha/1�-�o
/-
�-
IN Primary
115
- -
--r-
--r-
--r-
--r
r. r
dJi�
Secondary
110
-
--r-
--r---i-
--r---I
-
105
I-
100
95
i
�
i �
i
i i
� i
i
i �
i
}} ^i � i � wwi f
90
- -
J--L-J--L-1--L-J--L-
-------�-Stor
- - -- - --L- --
85
-,-
--r-
--r-
--r-
--r-,----
--r-
--r----r---r-,--r- --
80
-�-
J--L-J--L-�--�-J--L-�--'--J--L-J--L--'--�-J--L-�--L-J--
75
---
-----------------------------------------------------
70
- -
--
- --
- --
- --
- ----
--
-
-- ---- - -- - -- - --
w65
---
-----------------------------------------------------
60
42.04 Cfs
° so
LL
38.26 cfs
--
- --
- --
- --
- ----
--
-
-- ---- - -- - -- - --
45
-----------------------------------------------------
40
--
- --
- --
- --
- ----
--
-
-- ---- - -- - -- - --
35
30
--r-
--r-
--r-
--r-
--r-
--r-
--r--i--r- --r- --r- --
25
---'
--'--'
--'--'
--'--'
--'--'
--'--'
--'--'
--'--' --'--' --'--' --'--
20
15
10
3.78 cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 14
Hydrograph for Pond 10P: POND 4
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.23
539
677.12
0.05
0.05
0.00
7.50
0.72
2,175
677.45
0.57
0.57
0.00
10.00
1.98
5,027
677.96
1.34
1.34
0.00
12.50
7.84
64,793
682.79
12.16
12.16
0.00
15.00
2.32
54,282
682.26
3.73
3.73
0.00
17.50
1.48
38,408
681.32
3.36
3.36
0.00
20.00
1.01
21,843
680.05
2.77
2.77
0.00
22.50
0.90
9,207
678.61
1.90
1.90
0.00
25.00
0.00
1,991
677.41
0.49
0.49
0.00
27.50
0.00
538
677.12
0.05
0.05
0.00
30.00
0.00
297
677.06
0.02
0.02
0.00
32.50
0.00
204
677.04
0.01
0.01
0.00
35.00
0.00
155
677.03
0.00
0.00
0.00
37.50
0.00
125
677.03
0.00
0.00
0.00
40.00
0.00
104
677.02
0.00
0.00
0.00
42.50
0.00
89
677.02
0.00
0.00
0.00
45.00
0.00
78
677.02
0.00
0.00
0.00
47.50
0.00
70
677.02
0.00
0.00
0.00
50.00
0.00
63
677.01
0.00
0.00
0.00
52.50
0.00
57
677.01
0.00
0.00
0.00
55.00
0.00
52
677.01
0.00
0.00
0.00
57.50
0.00
48
677.01
0.00
0.00
0.00
60.00
0.00
45
677.01
0.00
0.00
0.00
62.50
0.00
42
677.01
0.00
0.00
0.00
65.00
0.00
39
677.01
0.00
0.00
0.00
67.50
0.00
37
677.01
0.00
0.00
0.00
70.00
0.00
35
677.01
0.00
0.00
0.00
72.50
0.00
33
677.01
0.00
0.00
0.00
75.00
0.00
31
677.01
0.00
0.00
0.00
77.50
0.00
30
677.01
0.00
0.00
0.00
80.00
0.00
29
677.01
0.00
0.00
0.00
82.50
0.00
27
677.01
0.00
0.00
0.00
85.00
0.00
26
677.01
0.00
0.00
0.00
87.50
0.00
25
677.01
0.00
0.00
0.00
90.00
0.00
24
677.01
0.00
0.00
0.00
92.50
0.00
23
677.01
0.00
0.00
0.00
95.00
0.00
22
677.00
0.00
0.00
0.00
97.50
0.00
22
677.00
0.00
0.00
0.00
100.00
0.00
21
677.00
0.00
0.00
0.00
102.50
0.00
20
677.00
0.00
0.00
0.00
105.00
0.00
20
677.00
0.00
0.00
0.00
107.50
0.00
19
677.00
0.00
0.00
0.00
110.00
0.00
18
677.00
0.00
0.00
0.00
112.50
0.00
18
677.00
0.00
0.00
0.00
115.00
0.00
17
677.00
0.00
0.00
0.00
117.50
0.00
17
677.00
0.00
0.00
0.00
120.00
0.00
16
677.00
0.00
0.00
0.00

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 15
Stage -Discharge for Pond 10P: POND 4
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.13
0.13
0.00
677.30
0.28
0.28
0.00
677.40
0.47
0.47
0.00
677.50
0.68
0.68
0.00
677.60
0.87
0.87
0.00
677.70
1.02
1.02
0.00
677.80
1.15
1.15
0.00
677.90
1.27
1.27
0.00
678.00
1.37
1.37
0.00
678.10
1.47
1.47
0.00
678.20
1.56
1.56
0.00
678.30
1.65
1.65
0.00
678.40
1.74
1.74
0.00
678.50
1.82
1.82
0.00
678.60
1.89
1.89
0.00
678.70
1.96
1.96
0.00
678.80
2.04
2.04
0.00
678.90
2.10
2.10
0.00
679.00
2.17
2.17
0.00
679.10
2.23
2.23
0.00
679.20
2.30
2.30
0.00
679.30
2.36
2.36
0.00
679.40
2.42
2.42
0.00
679.50
2.47
2.47
0.00
679.60
2.53
2.53
0.00
679.70
2.59
2.59
0.00
679.80
2.64
2.64
0.00
679.90
2.69
2.69
0.00
680.00
2.74
2.74
0.00
680.10
2.80
2.80
0.00
680.20
2.85
2.85
0.00
680.30
2.89
2.89
0.00
680.40
2.94
2.94
0.00
680.50
2.99
2.99
0.00
680.60
3.04
3.04
0.00
680.70
3.08
3.08
0.00
680.80
3.13
3.13
0.00
680.90
3.17
3.17
0.00
681.00
3.22
3.22
0.00
681.10
3.26
3.26
0.00
681.20
3.30
3.30
0.00
681.30
3.35
3.35
0.00
681.40
3.39
3.39
0.00
681.50
3.43
3.43
0.00
681.60
3.47
3.47
0.00
681.70
3.51
3.51
0.00
681.80
3.55
3.55
0.00
681.90
3.59
3.59
0.00
682.00
3.63
3.63
0.00
682.10
3.67
3.67
0.00
682.20
3.71
3.71
0.00
682.30
3.75
3.75
0.00
682.40
3.78
3.78
0.00
682.50
3.82
3.82
0.00
682.60
5.51
5.51
0.00
682.70
8.57
8.57
0.00
682.80
12.53
12.53
0.00
682.90
17.20
17.20
0.00
683.00
22.50
22.50
0.00
683.10
28.35
28.35
0.00
683.20
34.71
34.71
0.00
683.30
36.77
36.77
0.00
683.40
37.08
37.08
0.00
683.50
37.39
37.39
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
38.48
37.70
0.79
683.70
40.22
38.00
2.23
683.80
42.45
38.30
4.15
683.90
45.07
38.60
6.48
684.00
48.19
38.89
9.30
684.10
51.73
39.18
12.55
684.20
55.26
39.47
15.78
684.30
59.01
39.76
19.25
684.40
62.97
40.05
22.92
684.50
67.13
40.33
26.80
684.60
71.59
40.62
30.98
684.70
76.26
40.90
35.36
684.80
80.90
41.18
39.72
684.90
85.68
41.45
44.23
685.00
90.50
41.73
48.78

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 16
Stage -Area -Storage for Pond 10P: POND 4
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
4,560
0
677.10
4,695
463
677.20
4,830
939
677.30
4,965
1,429
677.40
5,100
1,932
677.50
5,235
2,449
677.60
5,369
2,979
677.70
5,504
3,523
677.80
5,639
4,080
677.90
5,774
4,650
678.00
5,909
5,235
678.10
6,096
5,835
678.20
6,283
6,454
678.30
6,470
7,091
678.40
6,657
7,748
678.50
6,845
8,423
678.60
7,032
9,117
678.70
7,219
9,829
678.80
7,406
10,560
678.90
7,593
11,310
679.00
7,780
12,079
679.10
8,069
12,871
679.20
8,357
13,693
679.30
8,646
14,543
679.40
8,935
15,422
679.50
9,224
16,330
679.60
9,512
17,267
679.70
9,801
18,232
679.80
10,090
19,227
679.90
10,378
20,250
680.00
10,667
21,303
680.10
11,008
22,386
680.20
11,349
23,504
680.30
11,690
24,656
680.40
12,031
25,842
680.50
12,372
27,062
680.60
12,712
28,316
680.70
13,053
29,605
680.80
13,394
30,927
680.90
13,735
32,283
681.00
14,076
33,674
681.10
14,439
35,100
681.20
14,803
36,562
681.30
15,166
38,060
681.40
15,530
39,595
681.50
15,893
41,166
681.60
16,256
42,774
681.70
16,620
44,418
681.80
16,983
46,098
681.90
17,347
47,814
682.00
17,710
49,567
682.10
18,096
51,357
682.20
18,482
53,186
682.30
18,868
55,054
682.40
19,254
56,960
682.50
19,641
58,905
682.60
20,027
60,888
682.70
20,413
62,910
682.80
20,799
64,971
682.90
21,185
67,070
683.00
21,571
69,208
683.10
21,980
71,385
683.20
22,389
73,603
683.30
22,797
75,863
683.40
23,206
78,163
683.50
23.615
80.504
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
24,024
82,886
683.70
24,433
85,309
683.80
24,841
87,772
683.90
25,250
90,277
684.00
25,659
92,823
684.10
26,090
95,410
684.20
26,522
98,041
684.30
26,953
100,714
684.40
27,385
103,431
684.50
27,816
106,191
684.60
28,247
108,994
684.70
28,679
111,841
684.80
29,110
114,730
684.90
29,542
117,663
685.00
29,973
120,639

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 17
Summary for Pond 13P: POND 1
Inflow Area = 31.010 ac, 78.30% Impervious, Inflow Depth = 6.25" for 100yr-24hr event
Inflow = 315.46 cfs @ 11.95 hrs, Volume= 16.138 of
Outflow = 99.43 cfs @ 12.08 hrs, Volume= 16.129 af, Atten= 68%, Lag= 7.8 min
Primary = 90.65 cfs @ 12.08 hrs, Volume= 16.022 of
Secondary = 8.78 cfs @ 12.08 hrs, Volume= 0.107 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 708.98' @ 12.08 hrs Surf.Area= 60,531 sf Storage= 328,617 cf
Plug -Flow detention time= 255.5 min calculated for 16.122 of (100% of inflow)
Center -of -Mass det. time= 256.8 min ( 1,030.5 - 773.7 )
Volume
Invert Avail.Storage Storage Description
#1
701.00'
393,227 cf Custom
Stage Data (Prismatic)Listed below (Recalc)
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
701.00
22,606
0
0
702.00
30,532
26,569
26,569
703.00
33,334
31,933
58,502
704.00
36,378
34,856
93,358
705.00
39,732
38,055
131,413
706.00
43,988
41,860
173,273
707.00
49,187
46,588
219,861
708.00
54,818
52,003
271,863
709.00
60,624
57,721
329,584
710.00
66,662
63,643
393,227
Device Routing Invert Outlet Devices
#1 Primary 700.39' 36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 700.39' / 700.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1 701.00' 10.0" Vert. 8" Orifice C= 0.600
#3 Device 1 706.00' 36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1 708.00' 48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary 708.50' 10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=90.55 cfs @ 12.08 hrs HW=708.97' TW=0.00' (Dynamic Tailwater)
L1=Culvert (Inlet Controls 90.55 cfs @ 12.81 fps)
2=8" Orifice (Passes < 7.22 cfs potential flow)
3=Orifice/Grate (Passes < 46.86 cfs potential flow)
=Top of OS (Passes < 49.83 cfs potential flow)
Secondary OutFlow Max=8.35 cfs @ 12.08 hrs HW=708.97' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway (Weir Controls 8.35 cfs @ 1.78 fps)

TriWest Building 2 SWM Type 1124-hr 100yr-24hr Rainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 18
'0=6 1 gM10 141i
Hydrograph
315.46 CfS
r-y--r-
--r-y--r-y--r-y--r-y--r----r-y--r-y--r-y-
■ inflow
IN Outflow
- -
--r-
--r-
--r-
--r-
--r
r r r
-1 nflo-rw Are ea=311.040 a -
■Primary
-,-
--r-
--r-
--r-
--r-,----
i
--r-
,1
--r----ram-r-,--r- --
■ Secondary
340
---
-------------r-
--
- --
- --
-PeA-E]C�y�lf=7-08y98' -
320
300
I-
�1,
280
-
----------
--I
------
--------Slora'te=328
-ef
260
240
220
200
180
0 160
LL
99.43 cfs
--
- --
- --
- --
- ----
--
- -- ---- - -- - -- - --
140
90.65 cfs
--
- --
- --
- --
- ----
--
- -- ---- - -- - -- - --
120
100
--r-
--r-
--r-
--r-1--i--
--r-
--r--i--r---r-1--r- --
80
--r-
--r-
--r-
--r-
--r-
--r-
--r--i--r- --r- --r- --
60
40
8.78 cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 19
Hydrograph for Pond 13P: POND 1
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
701.00
0.00
0.00
0.00
2.50
0.00
0
701.00
0.00
0.00
0.00
5.00
1.18
4,439
701.19
0.14
0.14
0.00
7.50
2.75
16,389
701.65
1.26
1.26
0.00
10.00
6.73
38,629
702.39
2.59
2.59
0.00
12.50
23.55
278,828
708.13
47.78
47.78
0.00
15.00
6.93
182,502
706.21
8.47
8.47
0.00
17.50
4.42
171,975
705.97
5.60
5.60
0.00
20.00
3.01
155,892
705.60
5.37
5.37
0.00
22.50
2.69
134,560
705.08
5.03
5.03
0.00
25.00
0.00
106,017
704.34
4.49
4.49
0.00
27.50
0.00
69,428
703.32
3.63
3.63
0.00
30.00
0.00
40,976
702.46
2.69
2.69
0.00
32.50
0.00
21,295
701.82
1.68
1.68
0.00
35.00
0.00
11,029
701.45
0.69
0.69
0.00
37.50
0.00
6,844
701.29
0.31
0.31
0.00
40.00
0.00
4,830
701.21
0.16
0.16
0.00
42.50
0.00
3,690
701.16
0.10
0.10
0.00
45.00
0.00
2,970
701.13
0.07
0.07
0.00
47.50
0.00
2,477
701.11
0.05
0.05
0.00
50.00
0.00
2,120
701.09
0.03
0.03
0.00
52.50
0.00
1,851
701.08
0.03
0.03
0.00
55.00
0.00
1,641
701.07
0.02
0.02
0.00
57.50
0.00
1,473
701.06
0.02
0.02
0.00
60.00
0.00
1,336
701.06
0.01
0.01
0.00
62.50
0.00
1,221
701.05
0.01
0.01
0.00
65.00
0.00
1,125
701.05
0.01
0.01
0.00
67.50
0.00
1,042
701.05
0.01
0.01
0.00
70.00
0.00
970
701.04
0.01
0.01
0.00
72.50
0.00
908
701.04
0.01
0.01
0.00
75.00
0.00
853
701.04
0.01
0.01
0.00
77.50
0.00
804
701.04
0.01
0.01
0.00
80.00
0.00
761
701.03
0.00
0.00
0.00
82.50
0.00
722
701.03
0.00
0.00
0.00
85.00
0.00
686
701.03
0.00
0.00
0.00
87.50
0.00
654
701.03
0.00
0.00
0.00
90.00
0.00
625
701.03
0.00
0.00
0.00
92.50
0.00
598
701.03
0.00
0.00
0.00
95.00
0.00
574
701.03
0.00
0.00
0.00
97.50
0.00
551
701.02
0.00
0.00
0.00
100.00
0.00
530
701.02
0.00
0.00
0.00
102.50
0.00
511
701.02
0.00
0.00
0.00
105.00
0.00
492
701.02
0.00
0.00
0.00
107.50
0.00
476
701.02
0.00
0.00
0.00
110.00
0.00
460
701.02
0.00
0.00
0.00
112.50
0.00
445
701.02
0.00
0.00
0.00
115.00
0.00
431
701.02
0.00
0.00
0.00
117.50
0.00
418
701.02
0.00
0.00
0.00
120.00
0.00
406
701.02
0.00
0.00
0.00

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 20
Stage -Discharge for Pond 13P: POND 1
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
701.00
0.00
0.00
0.00
701.10
0.04
0.04
0.00
701.20
0.15
0.15
0.00
701.30
0.33
0.33
0.00
701.40
0.56
0.56
0.00
701.50
0.82
0.82
0.00
701.60
1.11
1.11
0.00
701.70
1.39
1.39
0.00
701.80
1.64
1.64
0.00
701.90
1.83
1.83
0.00
702.00
2.01
2.01
0.00
702.10
2.17
2.17
0.00
702.20
2.32
2.32
0.00
702.30
2.47
2.47
0.00
702.40
2.60
2.60
0.00
702.50
2.73
2.73
0.00
702.60
2.86
2.86
0.00
702.70
2.98
2.98
0.00
702.80
3.09
3.09
0.00
702.90
3.20
3.20
0.00
703.00
3.30
3.30
0.00
703.10
3.41
3.41
0.00
703.20
3.51
3.51
0.00
703.30
3.60
3.60
0.00
703.40
3.70
3.70
0.00
703.50
3.79
3.79
0.00
703.60
3.88
3.88
0.00
703.70
3.97
3.97
0.00
703.80
4.05
4.05
0.00
703.90
4.14
4.14
0.00
704.00
4.22
4.22
0.00
704.10
4.30
4.30
0.00
704.20
4.38
4.38
0.00
704.30
4.46
4.46
0.00
704.40
4.54
4.54
0.00
704.50
4.61
4.61
0.00
704.60
4.69
4.69
0.00
704.70
4.76
4.76
0.00
704.80
4.83
4.83
0.00
704.90
4.90
4.90
0.00
705.00
4.97
4.97
0.00
705.10
5.04
5.04
0.00
705.20
5.11
5.11
0.00
705.30
5.18
5.18
0.00
705.40
5.24
5.24
0.00
705.50
5.31
5.31
0.00
705.60
5.37
5.37
0.00
705.70
5.44
5.44
0.00
705.80
5.50
5.50
0.00
705.90
5.56
5.56
0.00
706.00
5.62
5.62
0.00
706.10
6.60
6.60
0.00
706.20
8.33
8.33
0.00
706.30
10.55
10.55
0.00
706.40
13.17
13.17
0.00
706.50
16.14
16.14
0.00
706.60
19.41
19.41
0.00
706.70
22.78
22.78
0.00
706.80
25.36
25.36
0.00
706.90
27.56
27.56
0.00
707.00
29.54
29.54
0.00
707.10
31.35
31.35
0.00
707.20
33.04
33.04
0.00
707.30
34.63
34.63
0.00
707.40
36.14
36.14
0.00
707.50
37.57
37.57
0.00
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
707.60
38.95
38.95
0.00
707.70
40.27
40.27
0.00
707.80
41.55
41.55
0.00
707.90
42.78
42.78
0.00
708.00
43.97
43.97
0.00
708.10
46.79
46.79
0.00
708.20
50.94
50.94
0.00
708.30
55.95
55.95
0.00
708.40
61.66
61.66
0.00
708.50
67.97
67.97
0.00
708.60
75.60
74.81
0.79
708.70
84.36
82.14
2.23
708.80
93.62
89.47
4.15
708.90
96.59
90.11
6.48
709.00
100.05
90.75
9.30
709.10
103.94
91.39
12.55
709.20
107.80
92.02
15.78
709.30
111.90
92.65
19.25
709.40
116.20
93.27
22.92
709.50
120.69
93.89
26.80
709.60
125.48
94.50
30.98
709.70
130.48
95.12
35.36
709.80
135.45
95.72
39.72
709.90
140.55
96.33
44.23
710.00
145.70
96.93
48.78

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 21
Stage -Area -Storage for Pond 13P: POND 1
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
701.00
22,606
0
701.10
23,399
2,300
701.20
24,191
4,680
701.30
24,984
7,138
701.40
25,776
9,676
701.50
26,569
12,294
701.60
27,362
14,990
701.70
28,154
17,766
701.80
28,947
20,621
701.90
29,739
23,555
702.00
30,532
26,569
702.10
30,812
29,636
702.20
31,092
32,731
702.30
31,373
35,855
702.40
31,653
39,006
702.50
31,933
42,185
702.60
32,213
45,393
702.70
32,493
48,628
702.80
32,774
51,891
702.90
33,054
55,183
703.00
33,334
58,502
703.10
33,638
61,851
703.20
33,943
65,230
703.30
34,247
68,639
703.40
34,552
72,079
703.50
34,856
75,550
703.60
35,160
79,050
703.70
35,465
82,582
703.80
35,769
86,143
703.90
36,074
89,735
704.00
36,378
93,358
704.10
36,713
97,013
704.20
37,049
100,701
704.30
37,384
104,422
704.40
37,720
108,178
704.50
38,055
111,966
704.60
38,390
115,789
704.70
38,726
119,644
704.80
39,061
123,534
704.90
39,397
127,457
705.00
39,732
131,413
705.10
40,158
135,407
705.20
40,583
139,445
705.30
41,009
143,524
705.40
41,434
147,646
705.50
41,860
151,811
705.60
42,286
156,018
705.70
42,711
160,268
705.80
43,137
164,561
705.90
43,562
168,895
706.00
43,988
173,273
706.10
44,508
177,698
706.20
45,028
182,175
706.30
45,548
186,703
706.40
46,068
191,284
706.50
46,588
195,917
706.60
47,107
200,602
706.70
47,627
205,338
706.80
48,147
210,127
706.90
48,667
214,968
707.00
49,187
219,861
707.10
49,750
224,807
707.20
50,313
229,811
707.30
50,876
234,870
707.40
51,439
239,986
707.50
52.003
245.158
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
707.60
52,566
250,386
707.70
53,129
255,671
707.80
53,692
261,012
707.90
54,255
266,409
708.00
54,818
271,863
708.10
55,399
277,374
708.20
55,979
282,943
708.30
56,560
288,570
708.40
57,140
294,255
708.50
57,721
299,998
708.60
58,302
305,799
708.70
58,882
311,658
708.80
59,463
317,575
708.90
60,043
323,551
709.00
60,624
329,584
709.10
61,228
335,677
709.20
61,832
341,830
709.30
62,435
348,043
709.40
63,039
354,317
709.50
63,643
360,651
709.60
64,247
367,045
709.70
64,851
373,500
709.80
65,454
380,015
709.90
66,058
386,591
710.00
66,662
393,227

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 22
Summary for Pond 15P: POND 6
Inflow Area = 13.860 ac, 74.39% Impervious, Inflow Depth = 6.13" for 100yr-24hr event
Inflow = 139.51 cfs @ 11.95 hrs, Volume= 7.078 of
Outflow = 33.85 cfs @ 12.11 hrs, Volume= 7.066 af, Atten= 76%, Lag= 9.3 min
Primary = 33.85 cfs @ 12.11 hrs, Volume= 7.066 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 681.33' @ 12.11 hrs Surf.Area= 41,336 sf Storage= 148,261 cf
Plug -Flow detention time= 247.7 min calculated for 7.063 of (100% of inflow)
Center -of -Mass det. time= 248.5 min ( 1,025.6 - 777.0 )
Volume Invert
Avail.Storage Storage Description
#1 677.00'
270,951 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
677.00
27,493
0 0
678.00
30,495
28,994 28,994
679.00
33,652
32,074 61,068
680.00
36,914
35,283 96,351
681.00
40,232
38,573 134,924
682.00
43,608
41,920 176,844
683.00
47,039
45,324 222,167
684.00
50,528
48,784 270,951
Device Routing
Invert
Outlet Devices
#1 Primary
676.39'
36.0" Round Culvert L= 78.4' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 676.39' / 676.00' S= 0.0050 '/' Cc= 0.900
n= 0.012, Flow Area= 7.07 sf
#2 Device 1
677.00'
10.0" Vert. 8" Orifice C= 0.600
#3 Device 1
680.00'
36.0" W x 8.0" H Vert. Orifice/Grate X 3.00 C= 0.600
#4 Device 1
682.00'
48.0" x 48.0" Horiz. Top of OS C= 0.600 Limited to weir flow at low heads
#5 Secondary
682.50'
10.0' long x 10.0' breadth Emergency Spillway
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64
Primary OutFlow Max=33.78 cfs @ 12.11 hrs HW=681.32' TW=0.00' (Dynamic Tailwater)
1­1=Culvert (Passes 33.78 cfs of 61.36 cfs potential flow)
2=8" Orifice (Orifice Controls 5.19 cfs @ 9.52 fps)
3=Orifice/Grate (Orifice Controls 28.59 cfs @ 4.77 fps)
=Top of OS ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=677.00' TW=0.00' (Dynamic Tailwater)
T 5=Emergency Spillway ( Controls 0.00 cfs)

TriWest Building 2 SWM Type 1124-hr 100yr-24hr Rainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD® 10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Pane 23
'0=6 1 gMMR09]kiI1I:
.....
Outflow
LIn
i ••i
Secondary
M Seco nda]ry
•
140
Peak EjeV*681.33
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TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 24
Hydrograph for Pond 15P: POND 6
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
677.00
0.00
0.00
0.00
2.50
0.00
0
677.00
0.00
0.00
0.00
5.00
0.45
1,541
677.06
0.01
0.01
0.00
7.50
1.13
7,620
677.27
0.28
0.28
0.00
10.00
2.87
18,166
677.64
1.22
1.22
0.00
12.50
10.46
128,217
680.83
24.84
24.84
0.00
15.00
3.08
96,364
680.00
4.22
4.22
0.00
17.50
1.97
81,296
679.58
3.87
3.87
0.00
20.00
1.34
63,478
679.07
3.38
3.38
0.00
22.50
1.20
46,921
678.57
2.82
2.82
0.00
25.00
0.00
30,842
678.06
2.11
2.11
0.00
27.50
0.00
16,538
677.58
1.06
1.06
0.00
30.00
0.00
10,133
677.36
0.46
0.46
0.00
32.50
0.00
7,100
677.25
0.24
0.24
0.00
35.00
0.00
5,407
677.19
0.15
0.15
0.00
37.50
0.00
4,344
677.16
0.10
0.10
0.00
40.00
0.00
3,620
677.13
0.07
0.07
0.00
42.50
0.00
3,099
677.11
0.05
0.05
0.00
45.00
0.00
2,705
677.10
0.04
0.04
0.00
47.50
0.00
2,399
677.09
0.03
0.03
0.00
50.00
0.00
2,154
677.08
0.02
0.02
0.00
52.50
0.00
1,954
677.07
0.02
0.02
0.00
55.00
0.00
1,787
677.06
0.02
0.02
0.00
57.50
0.00
1,646
677.06
0.01
0.01
0.00
60.00
0.00
1,525
677.06
0.01
0.01
0.00
62.50
0.00
1,421
677.05
0.01
0.01
0.00
65.00
0.00
1,330
677.05
0.01
0.01
0.00
67.50
0.00
1,250
677.05
0.01
0.01
0.00
70.00
0.00
1,179
677.04
0.01
0.01
0.00
72.50
0.00
1,115
677.04
0.01
0.01
0.00
75.00
0.00
1,058
677.04
0.01
0.01
0.00
77.50
0.00
1,006
677.04
0.01
0.01
0.00
80.00
0.00
960
677.03
0.00
0.00
0.00
82.50
0.00
917
677.03
0.00
0.00
0.00
85.00
0.00
878
677.03
0.00
0.00
0.00
87.50
0.00
842
677.03
0.00
0.00
0.00
90.00
0.00
809
677.03
0.00
0.00
0.00
92.50
0.00
778
677.03
0.00
0.00
0.00
95.00
0.00
750
677.03
0.00
0.00
0.00
97.50
0.00
723
677.03
0.00
0.00
0.00
100.00
0.00
699
677.03
0.00
0.00
0.00
102.50
0.00
676
677.02
0.00
0.00
0.00
105.00
0.00
654
677.02
0.00
0.00
0.00
107.50
0.00
634
677.02
0.00
0.00
0.00
110.00
0.00
615
677.02
0.00
0.00
0.00
112.50
0.00
597
677.02
0.00
0.00
0.00
115.00
0.00
580
677.02
0.00
0.00
0.00
117.50
0.00
564
677.02
0.00
0.00
0.00
120.00
0.00
549
677.02
0.00
0.00
0.00

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 25
Stage -Discharge for Pond 15P: POND 6
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
677.00
0.00
0.00
0.00
677.10
0.04
0.04
0.00
677.20
0.15
0.15
0.00
677.30
0.33
0.33
0.00
677.40
0.56
0.56
0.00
677.50
0.82
0.82
0.00
677.60
1.11
1.11
0.00
677.70
1.39
1.39
0.00
677.80
1.64
1.64
0.00
677.90
1.83
1.83
0.00
678.00
2.01
2.01
0.00
678.10
2.17
2.17
0.00
678.20
2.32
2.32
0.00
678.30
2.47
2.47
0.00
678.40
2.60
2.60
0.00
678.50
2.73
2.73
0.00
678.60
2.86
2.86
0.00
678.70
2.98
2.98
0.00
678.80
3.09
3.09
0.00
678.90
3.20
3.20
0.00
679.00
3.30
3.30
0.00
679.10
3.41
3.41
0.00
679.20
3.51
3.51
0.00
679.30
3.60
3.60
0.00
679.40
3.70
3.70
0.00
679.50
3.79
3.79
0.00
679.60
3.88
3.88
0.00
679.70
3.97
3.97
0.00
679.80
4.05
4.05
0.00
679.90
4.14
4.14
0.00
680.00
4.22
4.22
0.00
680.10
5.22
5.22
0.00
680.20
6.97
6.97
0.00
680.30
9.21
9.21
0.00
680.40
11.84
11.84
0.00
680.50
14.83
14.83
0.00
680.60
18.11
18.11
0.00
680.70
21.50
21.50
0.00
680.80
24.10
24.10
0.00
680.90
26.31
26.31
0.00
681.00
28.30
28.30
0.00
681.10
30.13
30.13
0.00
681.20
31.83
31.83
0.00
681.30
33.44
33.44
0.00
681.40
34.95
34.95
0.00
681.50
36.40
36.40
0.00
681.60
37.79
37.79
0.00
681.70
39.12
39.12
0.00
681.80
40.41
40.41
0.00
681.90
41.65
41.65
0.00
682.00
42.86
42.86
0.00
682.10
45.68
45.68
0.00
682.20
49.84
49.84
0.00
682.30
54.87
54.87
0.00
682.40
60.59
60.59
0.00
682.50
66.90
66.90
0.00
682.60
74.54
73.75
0.79
682.70
76.87
74.64
2.23
682.80
79.57
75.42
4.15
682.90
82.66
76.18
6.48
683.00
86.24
76.94
9.30
683.10
90.23
77.69
12.55
683.20
94.21
78.43
15.78
683.30
98.41
79.16
19.25
683.40
102.82
79.89
22.92
683.50
107.41
80.61
26.80
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
683.60
112.31
81.33
30.98
683.70
117.40
82.04
35.36
683.80
122.46
82.74
39.72
683.90
127.67
83.44
44.23
684.00
132.90
84.13
48.78

TriWest Building 2 SWM Type 1124-hr 100yr-24hrRainfall=7.43"
Prepared by OAK Engineering, PLLC Printed 11/2/2022
HvdroCAD®10.00-26 s/n 10066 ©2020 HvdroCAD Software Solutions LLC Paae 26
Stage -Area -Storage for Pond 15P: POND 6
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
677.00
27,493
0
677.10
27,793
2,764
677.20
28,093
5,559
677.30
28,394
8,383
677.40
28,694
11,237
677.50
28,994
14,122
677.60
29,294
17,036
677.70
29,594
19,981
677.80
29,895
22,955
677.90
30,195
25,960
678.00
30,495
28,994
678.10
30,811
32,059
678.20
31,126
35,156
678.30
31,442
38,285
678.40
31,758
41,445
678.50
32,074
44,636
678.60
32,389
47,859
678.70
32,705
51,114
678.80
33,021
54,400
678.90
33,336
57,718
679.00
33,652
61,068
679.10
33,978
64,449
679.20
34,304
67,863
679.30
34,631
71,310
679.40
34,957
74,789
679.50
35,283
78,301
679.60
35,609
81,846
679.70
35,935
85,423
679.80
36,262
89,033
679.90
36,588
92,675
680.00
36,914
96,351
680.10
37,246
100,058
680.20
37,578
103,800
680.30
37,909
107,574
680.40
38,241
111,382
680.50
38,573
115,222
680.60
38,905
119,096
680.70
39,237
123,003
680.80
39,568
126,943
680.90
39,900
130,917
681.00
40,232
134,924
681.10
40,570
138,964
681.20
40,907
143,037
681.30
41,245
147,145
681.40
41,582
151,286
681.50
41,920
155,462
681.60
42,258
159,670
681.70
42,595
163,913
681.80
42,933
168,189
681.90
43,270
172,500
682.00
43,608
176,844
682.10
43,951
181,221
682.20
44,294
185,634
682.30
44,637
190,080
682.40
44,980
194,561
682.50
45,324
199,076
682.60
45,667
203,626
682.70
46,010
208,210
682.80
46,353
212,828
682.90
46,696
217,480
683.00
47,039
222,167
683.10
47,388
226,888
683.20
47,737
231,645
683.30
48,086
236,436
683.40
48,435
241,262
683.50
48.784
246.123
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
683.60
49,132
251,018
683.70
49,481
255,949
683.80
49,830
260,915
683.90
50,179
265,915
684.00
50,528
270,951