SW6091007_HISTORICAL FILE_20091117

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. SW 1Q22gl U 7
DOC TYPE ❑ CURRENT PERMIT
❑ APPROVED PLANS
I HISTORICAL FILE
(❑ COMPLIANCE EVALUATION. INSPECTION
DOC DATE'>�lll /7
YYYYMMDD

763 Comtech Drive, Pembroke, NC 28372
P.O. Box 1149 metcon
Tel. [phone] • Fax. [phone]
CONSTRUCTION
www.metconconstruction.net BUILDINGS • HIGHWAYS • PUBLIC UTILITIES
November 13, 2009
Belinda S.-Henson --
Regional Supervisor
Surface Water Protection Section
Dear'Ms.'Henson
In regard to NOV dated October 21, 2009, work was started in late Dec. 2003. When
Storage Unit Project was started site was established at less than one acre. Due to
unforeseen clearing and grubbing issues site was cleared beyond the one acres limit that -
was established in the beginning.
Once additional work was realized, the process to obtain a Storm Water Management
Permit was started and finally approved on May 26, 2009. During this time great effort
was placed on protecting the land surface with managing any run off and capturing any
sediment.'
While the permit was being reviewed it was determined that the site was in a high quality
water zone. During this time a different engineering firm was hired in order to expedite
all paper work, and testing. On October 30, 2009 a Storm Water Management Plan was
submitted to Mr. Lawyer. I hope this plan finds good favor and all issues are resolved.
Sincerely,
Greg Hunt
h4
Metcon";'Inc
Senior Project Manager----....,,

Anderson E.
P.O. Box 1736
305 North Chippewa
Lumberton, N.C. 28359
Licensure No.: C-0793
October 30, 2009
NCDENR-Land Quality Section
Attention: Mike Lawyer
225 Green Street, Suite 714
Fayetteville, NC 28301-5043
Ref: Metcon Storage Units —
Comtech Storage Soluti
Mike,
Please find enclosed
1)
Two copies
2)
One copy of
3)
One copy of
4)
One copy of
5)
One 8.5 x'1
6)
Two sets of
7)
Two sets of
8)
Application
I trust that this is suffic
additional information,
Supplement
Sincerely,
ANDERSON ENGIN ERING &
Wesley . Anderson
WMA/rrc
Enclosures
and
cc: Aaron Thomas, Metcon, Inc.
ineerin2 & Assoc., P.A.
your
Larry Anderson, P.E.
President
* ,,;10
you require any
National Society of
Professional Engineers®
NSPEdMeff* .
Phone: [phone] • Fax: [phone] • Email: [e-mail]

DWQUSE ONLY
Date Received
Fee Paid
Permit Number
0 3o a9
S
1wGtr9h'7
Applicable Rules:
(select all that apply)
❑ Coastal SW -1995 ❑ Coastal SW - 2008 ❑ Ph II - Post Construction
❑ Non -Coastal SW- HQW/ORW Waters ❑ Universal Stormwater Management Plan
❑ Other WQ M mt Plan:
State of North Carolina DENR—FRO
Department of Environment and Natural Resources ILd� IfY�3
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM DWQ
This forth may be photocopied for use as an original
I. GENERAL INFORMATION
1. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Comtech Storage Solutions, Com Tech Park
2. Location of Project (street address):
805 Comtech Drive
City:Pembroke County:Robeson Zip:28372
3. Directions to project (from nearest major intersection):
From NC Hwy 711 W (toward Pembroke), turn left onto Comtech Drive. Office is 0.7 mi on Left.
4. Latitude:34° 38' 42.57" N Longitude:79* 10' 01.99" W of the main entrance to the project.
H. PERMIT INFORMATION:
1. a. Specify whether project is (check one): ®New []Modification
b.If this application is being submitted as the result of a modification to an existing permit, list the existing
permit number , its issue date (if known) and the status of
construction: []Not Started ❑Partially Completed* ❑ Completed* *provide a designer's certification
2. Specify the type of project (check one):
❑Low Density ®High Density ❑Drains to an Offsite Stormwater System ❑Other
3. If this application is being submitted as the result of a previously returned application or a letter from DWQ
requesting a state stormwater management permit application, list the stormwater project number, if
assigned, and the previous name of the project, if different than currently
proposed,
4. a. Additional Project Requirements (check applicable blanks; information on required state permits can be
obtained by contacting the Customer Service Center at 1-877-623-6748):
❑LAMA Major ®Sedimentation/Erosion Control: 5.0 ac of Disturbed Area
❑NPDES Industrial Stormwater ❑404/401 Permit: Proposed Impacts
b.If any of these permits have already been acquired please provide the Project Name, Project/Permit Number,
issue date and the type of each permit:NCDENR Erosion Control, Project ID: ROBES-2009-018, issued 5-26-09
5 AC approved disturbed area.

III. CONTACT INFORMATION
1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee,
designated government official, individual, etc. who owns the Drolect):
Applicant/Organization:Township Developers
Signing Official &
b.Contact information for person listed in item la above:
Street Address:763 Comtech Drive
City:Pembroke State:NC Zip:28372
Mailing Address (if applicable):PO Box 1241
City:Pembroke State:NC Zip:28372
Phone: (910 ) 521-8013
Email:[e-mail]
Fax: (910 ) 521-8014
c. Please check the appropriate box. The applicant listed above is:
® The property owner (Skip to Contact Information, item 3a)
❑ Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below)
❑ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and
2b below)
❑ Developer* (Complete Contact Information, item 2a and 2b below.)
2. a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. (This is the
person who owns the property that the project is located on):
Property Owner/Organization:
Signing Official & Title:
b.Contact information for person listed in item 2a above:
Street Address:
City: State: Zip:
Mailing Address (if applicable):
City: State: Zip:
Phone:
Fax:
3. a. (Optional) Print the name and title of another contact such as the project's construction supervisor or other
person who can answer questions about the project:
Other Contact Person/Organization:Aaron Thomas
Signing Official & Title:Member/Manager
b.Contact information for person listed in item 3a above:
Mailing Address:Box 1241
City:Pembroke State:NC Zip:28372
Phone: (910 ) 521-8013
Email:[e-mail]
Fax: (910 ) 521-8014
4. Local jurisdiction for building permits: Town of Pembroke
Point of Contact:McDuffie Cummings, Manager Phone #: (910 ) 521-9758

IV. PROJECT INFORMATION
1. In the space provided below, briefly summarize how the stormwater runoff will be treated.
Stormwater will be collected and treated by the installation of a wet detention basin The basin will be
designed in accordance with NCDENR, DWO Best Management Practices A forebay will be included
2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved:
❑ Approval of a Site Specific Development Plan or PUD Approval Date:
❑ Valid Building Permit Issued Date:
❑ Other: Date:
b.Identify the regulation(s) the project has been designed in accordance with:
❑ Coastal SW -1995 ❑ Ph II - Post Construction
3. Stormwater runoff from this project drains to the Lumber River basin.
4. Total Property Area: 5 acres 5. Total Coastal Wetlands Area: 0 acres
6. Total Surface Water Area: 0.3 acres
y rf . �
7. Total Property Area (4) - Total Coastal Wetlands Area (5) -Total Surface Water Area (6) =Total Project dK b1r o(ts
Aree:4.7 acres s A !�
Total prgect area shall be calculated to exclude the following the normal pool of impounded structures, the area a'y
between the banks of streams and rivers, the area below the Nonnal High Water (NHW) line or Mean High Water e(A4-ce-
(MHW) line, and coastal wetlands landward from the NHW (or MHW) line. The resultant project area is used to /s f-
calculate overall percent built upon area (BUA). Non -coastal wetlands landward of the NHW (or MHW) line may
be included in the total project area.
8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = 24.47 %
9. How many drainage areas does the project have?1 (For high density, count 1 for each proposed engineered
stormwater BMP. For low density and other projects, use 1 for the whole property area)
10. Complete the following information for each drainage area identified in Project Information item 9. If there
are more than four drainage areas in the project, attach an additional sheet with the information for each area
provided in the same format as below.
BasinInformahon '
'&� _
-Draina e Area'] '
.Drama 'eAiea ."
_
Dfaiii e Area' -;
_
Diainaoe Aiea
Receiving Stream Name
Lumber
Stream Class *
WS-IV,B,Sw,hgw
Stream Index Number *
14-(7)
Total Drainage Area (so
204732
On -site Drainage Area (so
204732
Off -site Drainage Area (sf)
0
Proposed Impervious Area** s
50.094
% Impervious Area** total
24.47
Im" ` rv�ousa>;;Surface'Ar'ea ::
-Draiiia e'Are`a Y,
Drairia e A ea -
Di•aina e Area'
Draina e Area '="`
On -site Buildings/Lots (sf)
13939.20
On -site Streets (so
0
On -site Parking (so
36154.8
On -site Sidewalks (so
0
Other on -site (so
0
Future (so
0
Off -site (so
0
Existing BUA*** (so
0
Total (so:
50094
* Stream Class and Index Number can be determined at: http:lAl2o.enr.state.nc.nslbimslreports/rmortsWB html
** Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.

'Report only that amount of existing BUA that will remain after development. Do not report any existing BUA that
is to be removed and which will be replaced by new BUA.
11. How was the off -site impervious area listed above determined? Provide documentation. n/a
Projects in Union County: Contact DWQ Central Office staff to check if the project is located within a Threatened &
Endangered Species watershed that may be subject to more stringent .slormwater requirements as per NCAC 02B .0600.
V. SUPPLEMENT AND O&M FORMS
The applicable state stormwater management permit supplement and operation and maintenance (O&M) forms
must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded
fromhttr)://h2o.enr.stite.nc.us/su/bmo forms.htm.
VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. A detailed application instruction sheet and BMP
checklists are available from http://h2o.enr.state.nc.us/su/bmp forms.htm. The complete application
package should be submitted to the appropriate DWQ Office. (The appropriate office may be found by locating
project on the interactive online map at http:/ /h2o.enr.state.nc.us/su/msi_maps.htm.)
Please indicate that the following required information have been provided by initialing in the space provided for
each item. All original documents MUST be signed and initiated in blue ink. Download the latest versions for
each submitted application package from hft://h2o.enr.state.nc.us/su/`­bmp-forms.htm.
Initials
1. Original and one copy of the Stormwater Management Permit Application Form. wit"
2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants N/p I1111-
Form. (if required as per Part VII below)
3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M _ /AN
agreement(s) for each BMP.
4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to
http://www.envhelp.org/12ages/onestol2express.html for information on the Express program
and the associated fees. Contact the appropriate regional office Express Permit Coordinator for
additional information and to schedule the required application meeting.)
5. A detailed narrative (one to two pages) describing the stormwater treatment/managementfor
the project. This is required in addition to the brief summary provided in the Project
Information, item 1.
6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the
receiving stream drains to class SA waters within 1/2 mile of the site boundary, include the 1/2
mile radius on the map.
7. Sealed, signed and dated calculations.
8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including:
a. Development/Project name.
b. Engineer and firm.
c. Location map with named streets and NCSR numbers.
d. Legend.
e. North arrow.
f. Scale.
g. Revision number and dates.
h. Identify all surface waters on the plans by delineating the normal pool elevation of
impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal
waters, and any coastal wetlands landward of the MHW or NHW lines.
• Delineate the vegetated buffer landward from the normal pool elevation of impounded
structures, the banks of streams or rivers, and the MHW (or NHW) of tidal waters.
i. Dimensioned property/project boundary with bearings & distances.
j. Site Layout with all BUA identified and dimensioned.
k. Existing contours, proposed contours, spot elevations, finished floor elevations.
1. Details of roads, drainage features, collection systems, and stormwater control measures.
m. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a
qualified person. Provide documentation of qualifications and identify the person who
made the determination on the plans.
n. Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations.

o. Drainage areas delineated (included in the main set of plans, not as a separate document).
p. Vegetated buffers (where required).
9. Copy of any applicable soils report with the associated SHWT elevations (Please identify _
elevations in addition to depths) as well as a map of the boring locations with the existing
elevations and boring logs. Include an 8.5"xl1" copy of the NRCS County Soils map with the
project area clearly delineated. For projects with infiltration BMPs, the report should also
include the soil type, expected infiltration rate, and the method of determining the infiltration rate.
(Infiltration Devices submitted to WiRO: Schedule a site visit for DWQ to verify the SFIWT prior
to submittal, [phone].)
10. A copy of the most current property deed. Deed book: Page No: _
11. For corporations and limited liability corporations (LLC): Provide documentation from the NC
Secretary of State or other official documentation, which supports the titles and positions held
by the persons listed in Contact Information, item la, 2a, and/or 3a per NCAC 2I-I.1003(e). The
corporation or LLC must be listed as an active corporation in good standing with the NC
Secretary of State, otherwise the application will be returned.
http://www.secretary.state.ne.us/Corporations/­CSearch.aspx
VIL DEED RESTRICTIONS AND PROTECTIVE COVENANTS
For all subdivisions, outparcels, and future development, the appropriate property restrictions and protective
covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed
BUA allocations vary, a table listing each lot number, lot size, and the allowable built -upon area must be provided
as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and
protective covenants forms can be downloaded from
httl2://h2o enr state nc us/su/bml2 forms htmtldeed restrictions. Download the latest versions for each submittal.
In the instances where the applicant is different than the property owner, it is the responsibility of the property
owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring
that the deed restrictions are recorded.
By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and
protective covenants for this project, if required, shall include all the items required in the permit and listed
on the forms available on the website, that the covenants will be binding on all parties and persons claiming
under them, that they will run with the land, that the required covenants cannot be changed or deleted
without concurrence from the NC DWQ and that they will be recorded prior to the sale of any lot.
VIII. CONSULTANT INFORMATION AND AUTHORIZATION
Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as a
consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as
addressing requests for additional information).
Consulting Engineer:Larry W. Anderson PE
Consulting Firm: Anderson Engineering and Associates, PA
Mailing Address:PO Box 1736
City:Lumberton State:NC Zip:28359
Phone: (910 ) 671-9530 Fax: [phone]
IX. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out, complete this
section)
I, (print or hjpe name of person listed in Contact Information, item 2a) n/a , certify that I
own the property identified in this permit application, and thus give permission to (print or (i/pe name of person
listed in Contact Infonnation, itenn In) with (print or type nanne of organization listed in
Contact Infonnation, item Ib) to develop the project as currently proposed. A copy of
the lease agreement or pending property sales contract has been provided with the submittal, which indicates the
party responsible for the operation and maintenance of the stormwater system.

As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated
agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults on their
lease agreement, or pending sale, responsibility for compliance with the DWQ Stormwater permit reverts back to
me, the property owner. As the property owner, it is my responsibility to notify DWQ immediately and submit a
completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater treatment
facility without a valid permit. I understand that the operation of a stormwater treatment facility without a valid
permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement action including
the assessment of civil penalties of up to $25,000 per day, pursuant to NCGS 143-215.6.
Date:
a Notary Public for the State of , County of
do hereby certify that personally appeared
before me this _ day of and acknowledge the due execution of the application for
a stormwater permit. Witness my hand and official seal,
SEAL
My commission
X. APPLICANT'S CERTIFICATION
I, (print or hjpe name of person listed in Contact Information, item 2) Aaron Thomas
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of the
applicable stormwater Aes under 1�CAC 211,;1000,51.2006-246 (Ph. II - Post Construction) or SL 2008-211.
Date: 10 —2q — 0�
I, M eAom-le W. M i kker a Notary Public for the State of f3 0VVA CAmb n0. , County of
'?%okpe5on do hereby certify that Ag r on -Chomas personally appeared
before me this I day of 0tiblxv- 10OR and acknowledge the due exxe�cutiio�n" of the application for
a stormwater permit. Witness my hand and official seal, "t � as` � � -1 r ll.xwu�-
W.
%AOTAQA .
o '�'�i30,lc ci
SEAL
My commission expires

Comtech Storage Solutions
C/O TWP Developers, LLC
mm
Narrative:
It is proposed to install a stormwater treatment BMP at Comtech Storage Solutions in
Pembroke to control runoff and treat all stormwater prior to discharge. The project site is
located in the Lumber River Drainage Basin, and is subject to High Quality Water Standards. The
BMP will be a wet detention pond and will be designed for 90%TSS removal. Designs are in
accordance with the latest version of the NCDENR BMP Manual. A forebay will be utilized for
primary settlement and initial treatment. The Basin will be approximately 7 feet deep with a
permanent pool of 3 feet. A dewatering device is proposed to limit detention time to 3.38
days. Details of the dewatering device are shown on the plans. A secondary spillway will be
provided for emergency situations. The secondary spillway will be constructed of concrete and
rip rap.
The installation of the basin, as designed, will begin promptly upon approval of the enclosed
Stormwater Management Plan. After the basin is in place and functioning as designed, the
system will be certified by the Designer. The basin will be permanent, and will remain open for
cleaning, debris removal, and maintenance.

"STORMWATER RETENTION CALCULATIONS
Project: COMTech Storage Solutions By: SJP
Date: 10-29-2009 Job #: N/A
STAGE -STORAGE FUNCTION (ABOVE PERMANENT POOL)
�:LF.I:fry.
Yr� u
S
Z
CONTOUR CONTOUR AREA
INCR. VOL.
ACCUM. VOL.
STAGE
In S
In Z
Z est
[FTZj
[FT']
[FT']
[FT]
[FT]
154.50 0
0
0.0
155.00 9258.86
2315
2315
0.5
7.7470
-0.6931
0.49
156.00 10508.30
9884
12198
1.5
9.4091
0.4055
1.58
157.00 11814.29
11161
23360
2.5
10.0588
0.9163
2.51
158.00 13176.83
12496
35855
3.5
10.4872
1.2528
3.40
Constant (y-Intercept)
8.76043
Ks =
6377
Slope (X Coefficient)
1.41407
b =
1.41000
Standard Error of Coefficient
0.06623
R2 =
0.99798
STAGE -STORAGE FUNCTION
log -log plot
0.0000�-
8.0000
t �
t Seriesl
: Linear (Seriesl)
-
-1.0000 -0.5000 0.0000 0.5000 1.0000 1.5000
In Z
Asphalt Area =
0.83 ac
Building Area (Root) =
0.32 ac
Pervious Area =
3.55 ac
Pond Area =
0.30 ac
Total Drainage Area =
5.00 ac

STORMWATER RETENTION CALCULATIONS
Project: COMTech Storage Solutions By: SJP
Date: 10-29-2009 Job #: N/A
Runoff Coefficient, C:
Pre -Development
ID
Area (ac) C`
C x A
Unimproved cleared area
5.00 0.35
1.75
Wooded, deep ground litter
0.00 0.10
0.00
Total 5.00
1.75
C� = 0.35
TREATED RUNOFF
ID
Area (ac)
C.
C x A
Roof, inclined
0.32
1.00
0.32
Street, driveway, sidewalk
0.83
0.95
0.79
Lawn, dense soil, flat 2%
3.55
0.17
0.60
Commercial, Generalized
0.00
0.85
0.00
Total 4.70
1.71
C, = 0.36
'Source: Elements of Urban Stormwater Design by H. Rooney Malcolm, P.E. - Exhibit 1
Storm Intensit
o.3es
L = 650 ft
L3 1
H = 2.75 ft
I\ fj 11
T� = 9.39 min
T -
128
Say 9 min
Design Storm: 10 year
Location: Lumberton, NC
Duration Intensity
[min] [in/hr]
5 8.10
9 110
10 6.48
So, 110 = 6.80
TREATED QP = C x 110 x A = 11.51 cfs

STORMWATER RETENTION CALCULATIONS
Project: COMTech Storage Solutions By: SJP
Date: 10-29-2009 Job #: N/A
Estimate Volume of Runoff. V•
P1,10 = 2.58 in
SCS CURVE NUMBER:
Soil Type: Rains Sandy Loam
Storm: 1-hr 10 yr
Location: Pembroke, NC
Hydrologic Soil Group: B/D
ID
Area (ac)
CN*
CN x A
Impervious - Roof
0.32
98
31.36
Impervious - Parking lot, Sidewalk
0.83
98
81.34
Lawn, Good condition
3.55
80
284.00
Commercial & Business 85% Impervious
0.00
95
0.00
Total 4.70 39E
CNeff= 84
*Source: NC Erosion and Sediment Control Planning and Design Manual - Tables 8.03(e) - (9)
- 1000
S-CN-10
S = 1.90 in
V=Q*xA=
E(P-0.2�S�Z
P+0.8•S
Q. = 1.18 in
20104 cf
Imp. Area
ID
Area (ac)
% Imp
(ac)
Impervious - Roof
0.32
100%
0.32
Impervious - Parking lot, Sidewalk
0.83
100%
0.83
Lawn, Grass Medians
3.55
0%
0.00
Commercial & Business 85% Impervious
0.00
85%
0.00
Total
4.70
1.1 s
Time to Peak. T.:
T V
° 1.39•Q�
SIMPLE METHOD
RD =
1.0 in
Rv=0.05+0.9*IA
IA=
24%
V=3630*RD*Rv*A
Rv=
0.27 in/in
V =
4610 cf
Tp = 4.8 min (Using Simple Method)

STORMWATER RETENTION CALCULATIONS
Project: COMTech Storage Solutions By: SJP
Date: 10-29-2009 Job #: N/A
Allowable Discharge (Pre -development Conditions
Qa11= Qpre = Cpre x 110 x A
Cpre = 0.35
ho = 6.80 cfs
A = 5.00 ac
Qa11 = Qpre = 11.91 cfs
Peak Inflow* =
12198.30
cfs
Peak Pond Outflow* =
0.05
cfs
Peak Elevation* =
155.31
ft
Top of Pond El. [ft] = 158.00
Peak Storage* =
4742
cf
Storage Avail.[cf] = 35855
Allowed
Actual
cfs
cfs
0.05
<
11.91 OKI
*See Storm Routing on Next Page
OK!
OK!
STORM ROUTING
Pipe (Orifice)
V-Notch:
Input Data:
N
1
Q = C[tan(0/2)]H5i2
op
11.51 cfs
Cd
0.6
C = 2.5
Tp
5 min
D
1.5
0 = 0 degrees
AT
1 min
Zi
154.50
0 = 0.0000 radians
Weir:
Invert = 154.50 feet
Ks
6377
Cw
3.0
b
1.41
L
10.0
ft
Zcr
156.00
ft
INFLOW STORAGE STAGE ORIFICE V-NOTCH WEIR OUTFLOW
0
0.00
0
154.50
0
0.00
0.00
0.00
1
1.10
0
154.50
0.00
0.00
0.00
0.00
2
3.98
66
154.54
0.00
0.00
0.00
0.00
3
7.53
304
154.62
0.01
0.00
0.00
0.01
4
10.41
756
154.72
0.02
0.00
0.00
0.02
5
1151
1379
154.84
0.03
0.00
0.00
0.03
6
10.41
2068
154.95
0.04
0.00
0.00
0.04
7
8.10
2691
155.04
0.04
0.00
0.00
0.04
8
6.24
3174
155.11
0.04
0.00
0.00
0.04
9
4.81
3546
155.16
0.05
0.00
0.00
0.05
10
3.71
3832
155.20
0.05
0.00
0.00
0.05
11
2.86
4052
155.22
0.05
0.00
0.00
0.05
12
2.21
4220
155.25
0.05
0.00
0.00
0.05
13
1.70
4350
155.26
0.05
0.00
0.00
0.05
14
1.31
4449
155.27
0.05
0.00
0.00
0.05
15
1.01
4525
155.28
0.05
0.00
0.00
0.05
16
0.78
4582
155.29
0.05
0.00
0.00
0.05
17
0.60
4626
155.30
0.05
0.00
0.00
0.05

STORMWATER RETENTION CALCULATIONS
Project: COMTech Storage Solutions By: SJP
Date: 10-29-2009 Job M N/A
18
0.46
4659
155.30
0.05
0.00
0.00
0.05
19
0.36
4684
155.30
0.05
0.00
0.00
0.05
20
0.28
4702
155.31
0.05
0.00
0.00
0.05
21
0.21
4716
155.31
0.05
0.00
0.00
0.05
22
0.16
4726
155.31
0.05
0.00
0.00
0.05
23
0.13
4732
155.31
0.05
0.00
0.00
0.05
24
0.10
4737
155.31
0.05
0.00
0.00
0.05
25
0.08
4740
155.31
0.05
0.00
0.00
0.05
26
0.06
4741
155.31
0.05
0.00
0.00
0.05
27
0.04
F ;z4742
155i31 0 OS ter;;
0.00
0.00
Om05
28
0.03
4741
155.31
0.05
0.00
0.00
0.05
29
0.03
4740
155.31
0.05
0.00
0.00
0.05
30
0.02
4739
155.31
0.05
0.00
0.00
0.05
31
0.02
4737
155.31
0.05
0.00
0.00
0.05
32
0.01
4735
155.31
0.05
0.00
0.00
0.05
33
0.01
4732
155.31
0.05
0.00
0.00
0.05
34
0.01
4730
155.31
0.05
0.00
0.00
0.05
35
0.01
4727
155.31
0.05
0.00
0.00
0.05
36
0.00
4725
155.31
0.05
0.00
0.00
0.05
37
0.00
4722
155.31
0.05
0.00
0.00
0.05
38
0.00
4719
155.31
0.05
0.00
0.00
0.05
39
0.00
4716
155.31
0.05
0.00
0.00
0.05
40
0.00
4713
155.31
0.05
0.00
0.00
0.05
41
0.00
4710
155.31
0.05
0.00
0.00
0.05
42
0.00
4707
155.31
0.05
0.00
0.00
0.05
43
0.00
4704
155.31
0.05
0.00
0.00
0.05
44
0.00
4701
155.31
0.05
0.00
0.00
0.05
45
0.00
4698
155.31
0.05
0.00
0.00
0.05
46
0.00
4695
155.30
0.05
0.00
0.00
0.05
47
0.00
4692
155.30
0.05
0.00
0.00
0.05
48
0.00
4689
155.30
0.05
0.00
0.00
0.05
49
0.00
4686
155.30
0.05
0.00
0.00
0.05
50
0.00
4683
155.30
0.05
0.00
0.00
0.05
51
0.00
4680
155.30
0.05
0.00
0.00
0.05
52
0.00
4677
155.30
0.05
0.00
0.00
0.05
53
0.00
4674
155.30
0.05
0.00
0.00
0.05
54
0.00
4671
155.30
0.05
0.00
0.00
0.05
55
0.00
4668
155.30
0.05
0.00
0.00
0.05
56
0.00
4665
155.30
0.05
0.00
0.00
0.05
57
0.00
4662
155.30
0.05
0.00
0.00
0.05
58
0.00
4659
155.30
0.05
0.00
0.00
0.05
59
0.00
4656
155.30
0.05
0.00
0.00
0.05
60
0.00
4653
155.30
0.05
0.00
0.00
0.05
61
0.00
4649
155.30
0.05
0.00
0.00
0.05
62
0.00
4646
155.30
0.05
0.00
0.00
0.05
63
0.00
4643
155.30
0.05
0.00
0.00
0.05
64
0.00
4640
155.30
0.05
0.00
0.00
0.05
65
0.00
4637
155.30
0.05
0.00
0.00
0.05
66
0.00
4634
155.30
0.05
0.00
0.00
0.05
67
0.00
4631
155.30
0.05
0.00
0.00
0.05
68
0.00
4628
155.30
0.05
0.00
0.00
0.05
69
0.00
4625
155.30
0.05
0.00
0.00
0.05
70
0.00
4622
155.30
0.05
0.00
0.00
0.05

STORMWATER RETENTION CALCULATIONS
Project: COMTech Storage Solutions By: SJP
Date: 10-29-2009 Job M N/A
71
0.00
4619
155.30
0.05
0.00
0.00
0.05
72
0.00
4616
155.30
0.05
0.00
0.00
0.05
73
0.00
4613
155.29
0.05
0.00
0.00
0.05
74
0.00
4610
155.29
0.05
0.00
0.00
0.05
75
0.00
4607
155.29
0.05
0.00
0.00
0.05
76
0.00
4604
155.29
0.05
0.00
0.00
0.05
77
0.00
4601
155.29
0.05
0.00
0.00
0.05
78
0.00
4598
155.29
0.05
0.00
0.00
0.05
79
0.00
4595
155.29
0.05
0.00
0.00
0.05
80
0.00
4592
155.29
0.05
0.00
0.00
0.05
81
0.00
4589
155.29
0.05
0.00
0.00
0.05
82
0.00
4586
155.29
0.05
0.00
0.00
0.05
83
0.00
4583
155.29
0.05
0.00
0.00
0.05
84
0.00
4580
155.29
0.05
0.00
0.00
0.05
85
0.00
4577
155.29
0.05
0.00
0.00
0.05
86
0.00
4574
155.29
0.05
0.00
0.00
0.05
87
0.00
4571
155.29
0.05
0.00
0.00
0.05
88
0.00
4568
155.29
0.05
0.00
0.00
0.05
89
0.00
4565
155.29
0.05
0.00
0.00
0.05
90
0.00
4562
155.29
0.05
0.00
0.00
0.05
91
0.00
4559
155.29
0.05
0.00
0.00
0.05
92
0.00
4556
155.29
0.05
0.00
0.00
0.05
93
0.00
4553
155.29
0.05
0.00
0.00
0.05
94
0.00
4550
155.29
0.05
0.00
0.00
0.05
95
0.00
4547
155.29
0.05
0.00
0.00
0.05
96
0.00
4544
155.29
0.05
0.00
0.00
0.05
97
0.00
4541
155.29
0.05
0.00
0.00
0.05
98
0.00
4538
155.29
0.05
0.00
0.00
0.05
99
0.00
4535
155.29
0.05
0.00
0.00
0.05
100
0.00
4532
155.28
0.05
0.00
0.00
0.05
101
0.00
4529
155.28
0.05
0.00
0.00
0.05
102
0.00
4526
155.28
0.05
0.00
0.00
0.05
103
0.00
4523
155.28
0.05
0.00
0.00
0.05
104
0.00
4520
155.28
0.05
0.00
0.00
0.05
105
0.00
4517
155.28
0.05
0.00
0.00
0.05
106
0.00
4513
155.28
0.05
0.00
0.00
0.05
107
0.00
4510
155.28
0.05
0.00
0.00
0.05
108
0.00
4507
155.28
0.05
0.00
0.00
0.05
109
0.00
4504
155.28
0.05
0.00
0.00
0.05
110
0.00
4501
155.28
0.05
0.00
0.00
0.05
111
0.00
4498
155.28
0.05
0.00
0.00
0.05
112
0.00
4495
155.28
0.05
0.00
0.00
0.05
113
0.00
4492
155.28
0.05
0.00
0.00
0.05
114
0.00
4489
155.28
0.05
0.00
0.00
0.05
115
0.00
4486
155.28
0.05
0.00
0.00
0.05
116
0.00
4483
155.28
0.05
0.00
0.00
0.05
117
0.00
4480
155.28
0.05
0.00
0.00
0.05
118
0.00
4478
155.28
0.05
0.00
0.00
0.05
119
0.00
4475
155.28
0.05
0.00
0.00
0.05
120
0.00
4472
155.28
0.05
0.00
0.00
0.05

STORMWATER RETENTION CALCULATIONS
Project: COMTech Storage Solutions By: SJP
Date: 10-29-2009 Job #: N/A;'
Y@tlo<
DRAWDOWN TIME:
C A 2 HH�TVOLJME * 1MIN * 1HR # 1DAY
= Q 60S 60MIN 24IIR
CD = 0.6
A = 0.0123 sf
g = 32.2 ft/sec2
TPE = 156.00 fmsl
PPE = 154.50 fmsl
Ho= 1.5 ft
Hd3 = 0.5 ft
0 = 0.0418 cfs
VOLUME = 12198 cf
T = 3.38 days

STAGE -STORAGE FUNCTION (TOTALI
S Z
CONTOUR INCR. ACCUM.
CONTOUR AREA VOL. VOL. STAGE In S In Z Z est
149.00
0
0
0.0
150.00
2418.01
1209
1209
1.0
151.00
3053.18
2736
3945
2.0
152.00
3737.18
3395
7340
3.0
153.00
4480.06
4109
11448
4.0
154.00
5231.10
4856
16304
5.0
154.50
7018.87
3062
19366
5.5
155.00
9258.86
4069
23436
6.0
156.00
10508.30
9884
33319
7.0
157.00
11814.29
11161
44481
8.0
158.00
13176.83
12496
56976
9.0
Constant (y-Intercept)
7.06565
Slope (X Coefficient)
1.68836
Standard Error of Coefficient
0.07563
R2 =
0.99610
STAGE -STORAGE FUNCTION (FOREBAY
7.0976
0.0000
1.02
8.2801
0.6931
2.05
8.9011
1.0986
2.96
9.3456
1.3863
3.85
9.6992
1.6094
4.75
9.8713
1.7047
5.26
10.0620
1.7918
5.89
10.4139
1.9459
7.25
10.7028
2.0794
8.60
10.9504
2.1972
9.96
Ks = 1171
b = 1.69000
S
Z
CONTOUR
INCR.
ACCUM.
CONTOUR
AREA
VOL.
VOL.
STAGE
In S
In Z
Z est
[FT2]
[FTC]
[FT)
[FT]
[FT]
149.00
0
0
0.0
150.00
345.39
173
173
1.0
5.1515
0.0000
1.00
151.00
560.40
453
626
2.0
6.4387
0.6931
2.01
152.00
795.39
678
1303
3.0
7.1728
1.0986
2.98
153.00
1060.70
928
2232
4.0
7.7104
1.3863
3.99
154.00
1305.85
1183
3415
5.0
8.1359
1.6094
5.02
154.50
1705.90
753
4168
5.5
8.3351
1.7047
5.59
Constant (y-Intercept)
5.15098
Ks =
173
Slope (X Coefficient)
1.84949
b =
1.85000
Standard Error of Coefficient
0.00861
R2 =
0.99996
Drainage Area
4.7
Total Drainage Area
4.7
% of Total
100%
Required % of Perm.
Pool Volume
20%
% OF
TOTAL PERMANENT POOL VOLUME
22.0%
OK!

12.00
10.00
ME
tll
w
� 6.00
0
LL
4.00
M4111
� ��
Chainsaw Routing Results - 10 Year Design Storm
0 10 20 30 40 50 60 70 80 90 100
Time [min]
t Inflow
—a— Discharge

STORMWATER RETENTION CALCULATIONS
Project: COMTech Storage Solutions By: SJP
Date: 10-29-2009 Job #: N/A
STAGE -STORAGE FUNCTION (ABOVE PERMANENT POOL)
CONTOUR CONTOUR AREA
154.50 0
155.00 9258.86
2315
156.00 10508.30
9884
157.00 11814.29
11161
158.00 13176.83
12496
Constant (y-Intercept)
Slope (X Coefficient)
Standard Error of Coefficient
RZ =
S
Z
ACCUM.VOL.
STAGE
[FT']
[FT]
0
0.0
2315
0.5
12198
1.5
23360
2.5
35855
3.5
8.76043
1.41407
0.06623
0.99798
Asphalt Area =
0.83 ac
Building Area (Roof) =
0.32 ac
Pervious Area =
3.55 ac
Pond Area =
0.30 ac
Total Drainage Area =
5.00 ac
'l y,.ncce,ny.a
In S In Z
7.7470
-0.6931
0.49
9.4091
0.4055
1.58
10.0588
0.9163
2.51
10.4872
1.2528
3.40
Ks =
6377
b =
1.41000

STORMWATER RETENTION CALCULATIONS
Project: COMTech Storage Solutions By: SJP rx
Date: 10-29-2009 Job #: N/A
Runoff Coefficient, C:
Pre -Development
ID Area (ac) C. C x A
Unimproved cleared area 5.00 0.35 1.75
Wooded, deep ground litter 0.00 0.10 0.00
Total 5.00 1.75
C, = 0.35
TREATED RUNOFF
ID
Area (ac)
C'
C x A
Roof, inclined
0.32
1.00
0.32
Street, driveway, sidewalk
0.83
0.95
0.79
Lawn, dense soil, flat 2%
3.55
0.17
0.60
Commercial, Generalized
0.00
0.85
0.00
Total 4.70
1.71
C� = 0.36
'Source: Elements of Urban Stormwater Design by H. Rooney Malcolm, P.E. - Exhibit 1
Storm Intensit
o.3ss
L - 650 ft
3
L
H = 2.75 ft
H
T� = 9.39 min
T - 128
Say 9 min
Design Storm: 10 year
Location: Lumberton, NC
Duration
Intensity
[min)
[in/hr]
5
8.10
9
I10
10
6.48
So, 110 = 6.80
TREATED Qo = C x 110 x A = 11.51 cfs

STORMWATER RETENTION CALCULATIONS e
t' .r
� Project: COMTech Storage Solutions By: SJP
Date: 10-29-2009 Job #: N/A =
Estimate Volume of Runoff V:
P1,10 = 2.58 in
SCS CURVE NUMBER:
Soil Type: Rains Sandy Loam
Storm: 1-hr 10 yr
Location: Pembroke, NC
Hydrologic Soil Group: B/D
ID Area (ac) CN` CN x A
Impervious - Roof 0.32 98 31.36
Impervious - Parking lot, Sidewalk 0.83 98 81.34
Lawn, Good condition 3.55 80 284.00
Commercial & Business 85% Impervious 0.00 95 0.00
Total 4.70 396.70
CN,, = 84
`Source: NC Erosion and Sediment Control Planning and Design Manual - Tables 8.03(e) - (g)
- 1000
S-CN-10
S = 1.90 in
V=Q'xA=
E�P-0.2•S�Z
P+0.8•S
Q.= 1.18 in
20104 cf
Imp. Area
ID
Area (ac)
% Imp
(ac)
Impervious - Roof
0.32
100%
0.32
Impervious - Parking lot, Sidewalk
0.83
100%
0.83
Lawn, Grass Medians
3.55
0%
0.00
Commercial & Business 85% Impervious
0.00
85%
0.00
Total
4.70
1.15
Time to Peak. T,,:
F
ad
SIMPLE METHOD Rp =
1.0 in
RV=0.05+0.9•IA IA=
24%
V=3630•RD*RV*A RV=
0.27 in/in
V =
4610 cf
Tp = 4.8 min (Using Simple Method)

STORMWATER RETENTION CALCULATIONS °a
Project: COMTech Storage Solutions By: SJP r r
Date: 10-29-2009 Job #: N/A
Allowable Discharge (Pre -development Conditions
Qan = Qp, = Cp,e x [lox A
CM = 0.35
ho = 6.80 cfs
A = 5.00 ac
Qan = Qpre = 11.91 cfs
Peak Inflow* = 12198.30 cfs
Peak Pond Outflow* = 0.05 cfs
Peak Elevation* = 155.31 ft Top of Pond El. [ft] = 158.00 OK!
Peak Storage* = 4742 cf Storage Avail.[cf] = 35855 OK!
Actual Allowed
cfs cfs
0.05 < 11.91 OKI
*See Storm Routing on Next Page
STORM ROUTING
Pipe (Orifice):
Input Data:
N
Qp
11.51 cfs
Cd
Tp
5 min
D
AT
1 min
Zi
Weir:
Ks
6377
Cw
b
1.41
L
Zcr
V-Notch:
1
Q = C[tan(0/2)]H112
0.6
C = 2.5
1.5
0 = 0 degrees
154.50
0 = 0.0000 radians
Invert = 154.50 feet
3.0
10.0
ft
156.00
ft
INFLOW STORAGE STAGE ORIFICE V-NOTCH WEIR
u
u.uu
0
154.50
0
0.00
0.00
0.00
1
1.10
0
154.50
0.00
0.00
0.00
0.00
2
3.98
66
154.54
0.00
0.00
0.00
0.00
3
7.53
304
154.62
0.01
0.00
0.00
0.01
4
10.41
756
154.72
0.02
0.00
0.00
0.02
5
: s _ 11 51's=ems�
1379
154.84
0.03
0.00
0.00
0.03
6
10.41
2068
154.95
0.04
0.00
0.00
0.04
7
8.10
2691
155.04
0.04
0.00
0.00
0.04
8
6.24
3174
155.11
0.04
0.00
0.00
0.04
9
4.81
3546
155.16
0.05
0.00
0.00
0.05
10
3.71
3832
155.20
0.05
0.00
0.00
0.05
11
2.86
4052
155.22
0.05
0.00
0.00
0.05
12
2.21
4220
155.25
0.05
0.00
0.00
0.05
13
1.70
4350
155.26
0.05
0.00
0.00
0.05
14
1.31
4449
155.27
0.05
0.00
0.00
0.05
15
1.01
4525
155.28
0.05
0.00
0.00
0.05
16
0.78
4582
155.29
0.05
0.00
0.00
0.05
17
0.60
4626
155.30
0.05
0.00
0.00
0.05

STORMWATER
RETENTION
CALCULATIONS
Project: COMTech
Storage Solutions
By: SJP
O
Date: 10-29-2009
Job M N/A
18
0.46
4659
155.30
0.05
0.00
0.00
0.05
19
0.36
4684
155.30
0.05
0.00
0.00
0.05
20
0.28
4702
155.31
0.05
0.00
0.00
0.05
21
0.21
4716
155.31
0.05
0.00
0.00
0.05
22
0.16
4726
155.31
0.05
0.00
0.00
0.05
23
0.13
4732
155.31
0.05
0.00
0.00
0.05
24
0.10
4737
155.31
0.05
0.00
0.00
0.05
25
0.08
4740
155.31
0.05
0.00
0.00
0.05
26
0.06
4741
155.31
0.05
0.00
0.00
0.05
27
0.04
x':4742 rn 155?31 i . 0 OS ; 3
0.00
0 00
L^y O OS j
28
0.03
4741
155.31
0.05
0.00
0.00
0.05
29
0.03
4740
155.31
0.05
0.00
0.00
0.05
30
0.02
4739
155.31
0.05
0.00
0.00
0.05
31
0.02
4737
155.31
0.05
0.00
0.00
0.05
32
0.01
4735
155.31
0.05
0.00
0.00
0.05
33
0.01
4732
155.31
0.05
0.00
0.00
0.05
34
0.01
4730
155.31
0.05
0.00
0.00
0.05
35
0.01
4727
155.31
0.05
0.00
0.00
0.05
36
0.00
4725
155.31
0.05
0.00
0.00
0.05
37
0.00
4722
155.31
0.05
0.00
0.00
0.05
38
0.00
4719
155.31
0.05
0.00
0.00
0.05
39
0.00
4716
155.31
0.05
0.00
0.00
0.05
40
0.00
4713
155.31
0.05
0.00
0.00
0.05
41
0.00
4710
155.31
0.05
0.00
0.00
0.05
42
0.00
4707
155.31
0.05
0.00
0.00
0.05
43
0.00
4704
155.31
0.05
0.00
0.00
0.05
44
0.00
4701
155.31
0.05
0.00
0.00
0.05
45
0.00
4698
155.31
0.05
0.00
0.00
0.05
46
0.00
4695
155.30
0.05
0.00
0.00
0.05
47
0.00
4692
155.30
0.05
0.00
0.00
0.05
48
0.00
4689
155.30
0.05
0.00
0.00
0.05
49
0.00
4686
155.30
0.05
0.00
0.00
0.05
50
0.00
4683
155.30
0.05
0.00
0.00
0.05
51
0.00
4680
155.30
0.05
0.00
0.00
0.05
52
0.00
4677
155.30
0.05
0.00
0.00
0.05
53
0.00
4674
155.30
0.05
0.00
0.00
0.05
54
0.00
4671
155.30
0.05
0.00
0.00
0.05
55
0.00
4668
155.30
0.05
0.00
0.00
0.05
56
0.00
4665
155.30
0.05
0.00
0.00
0.05
57
0.00
4662
155.30
0.05
0.00
0.00
0.05
58
0.00
4659
155.30
0.05
0.00
0.00
0.05
59
0.00
4656
155.30
0.05
0.00
0.00
0.05
60
0.00
4653
155.30
0.05
0.00
0.00
0.05
61
0.00
4649
155.30
0.05
0.00
0.00
0.05
62
0.00
4646
155.30
0.05
0.00
0.00
0.05
63
0.00
4643
155.30
0.05
0.00
0.00
0.05
64
0.00
4640
155.30
0.05
0.00
0.00
0.05
65
0.00
4637
155.30
0.05
0.00
0.00
0.05
66
0.00
4634
155.30
0.05
0.00
0.00
0.05
67
0.00
4631
155.30
0.05
0.00
0.00
0.05
68
0.00
4628
155.30
0.05
0.00
0.00
0.05
69
0.00
4625
155.30
0.05
0.00
0.00
0.05
70
0.00
4622
155.30
0.05
0.00
0.00
0.05

STORMWATER RETENTION CALCULATIONS
Project: COMTech Storage Solutions By: SJP
Date: 10-29-2009 Job #: N/A
yFRtN
71
0.00
4619
155.30
0.05
0.00
0.00
0.05
72
0.00
4616
155.30
0.05
0.00
0.00
0.05
73
0.00
4613
155.29
0.05
0.00
0.00
0.05
74
0.00
4610
155.29
0.05
0.00
0.00
0.05
75
0.00
4607
155.29
0.05
0.00
0.00
0.05
76
0.00
4604
155.29
0.05
0.00
0.00
0.05
77
0.00
4601
155.29
0.05
0.00
0.00
0.05
78
0.00
4598
155.29
0.05
0.00
0.00
0.05
79
0.00
4595
155.29
0.05
0.00
0.00
0.05
80
0.00
4592
155.29
0.05
0.00
0.00
0.05
81
0.00
4589
155.29
0.05
0.00
0.00
0.05
82
0.00
4586
155.29
0.05
0.00
0.00
0.05
83
0.00
4583
155.29
0.05
0.00
0.00
0.05
84
0.00
4580
155.29
0.05
0.00
0.00
0.05
85
0.00
4577
155.29
0.05
0.00
0.00
0.05
86
0.00
4574
155.29
0.05
0.00
0.00
0.05
87
0.00
4571
155.29
0.05
0.00
0.00
0.05
88
0.00
4568
155.29
0.05
0.00
0.00
0.05
89
0.00
4565
155.29
0.05
0.00
0.00
0.05
90
0.00
4562
155.29
0.05
0.00
0.00
0.05
91
0.00
4559
155.29
0.05
0.00
0.00
0.05
92
0.00
4556
155.29
0.05
0.00
0.00
0.05
93
0.00
4553
155.29
0.05
0.00
0.00
0.05
94
0.00
4550
155.29
0.05
0.00
0.00
0.05
95
0.00
4547
155.29
0.05
0.00
0.00
0.05
96
0.00
4544
155.29
0.05
0.00
0.00
0.05
97
0.00
4541
155.29
0.05
0.00
0.00
0.05
98
0.00
4538
155.29
0.05
0.00
0.00
0.05
99
0.00
4535
155.29
0.05
0.00
0.00
0.05
100
0.00
4532
155.28
0.05
0.00
0.00
0.05
101
0.00
4529
155.28
0.05
0.00
0.00
0.05
102
0.00
4526
155.28
0.05
0.00
0.00
0.05
103
0.00
4523
155.28
0.05
0.00
0.00
0.05
104
0.00
4520
155.28
0.05
0.00
0.00
0.05
105
0.00
4517
155.28
0.05
0.00
0.00
0.05
106
0.00
4513
155.28
0.05
0.00
0.00
0.05
107
0.00
4510
155.28
0.05
0.00
0.00
0.05
108
0.00
4507
155.28
0.05
0.00
0.00
0.05
109
0.00
4504
155.28
0.05
0.00
0.00
0.05
110
0.00
4501
155.28
0.05
0.00
0.00
0.05
111
0.00
4498
155.28
0.05
0.00
0.00
0.05
112
0.00
4495
155.28
0.05
0.00
0.00
0.05
113
0.00
4492
155.28
0.05
0.00
0.00
0.05
114
0.00
4489
155.28
0.05
0.00
0.00
0.05
115
0.00
4486
155.28
0.05
0.00
0.00
0.05
116
0.00
4483
155.28
0.05
0.00
0.00
0.05
117
0.00
4480
155.28
0.05
0.00
0.00
0.05
118
0.00
4478
155.28
0.05
0.00
0.00
0.05
119
0.00
4475
155.28
0.05
0.00
0.00
0.05
120
0.00
4472
155.28
0.05
0.00
0.00
0.05

STORMWATER RETENTION CALCULATIONS
Project: COMTech Storage Solutions By: SJP
Date: 10-29-2009 Job #: N/A
DRAWDOWN TIME:
Q=CD'4 2gH„
CD =
A=
9=
TPE =
PPE =
Ho =
H J3 =
Q=
VOLUME =
T=
T _ VOLUME # IMIN * IHR * ]DAY
Q 60S 60MIN 24HR
0.6
0.0123
32.2
156.00
154.50
1.5
0.5
0.0418
12198
3.38
sf
ft/sec2
fmsl
fmsl
ft
ft
cfs
cf
days

STAGE -STORAGE FUNCTION (TOTAL)
S Z
CONTOUR INCR. ACCUM.
CONTOUR AREA VOL. VOL. STAGE In S In Z Z est
r,21 1LT31 ,,31 I- err
149.00
0
0
0.0
150.00
2418.01
1209
1209
1.0
151.00
3053.18
2736
3945
2.0
152.00
3737.18
3395
7340
3.0
153.00
4480.06
4109
11448
4.0
154.00
5231.10
4856
16304
5.0
154.50
7018.87
3062
19366
5.5
155.00
9258.86
4069
23436
6.0
156.00
10508.30
9884
33319
7.0
157.00
11814.29
11161
44481
8.0
158.00
13176.83
12496
56976
9.0
Constant (y-Intercept)
Slope (X Coefficient)
Standard Error of Coefficient
R2 =
STAGE -STORAGE FUNCTION (FOREBAY)
7.0976
0.0000
1.02
8.2801
0.6931
2.05
8.9011
1.0986
2.96
9.3456
1.3863
3.85
9.6992
1.6094
4.75
9.8713
1.7047
5.26
10.0620
1.7918
5.89
10.4139
1.9459
7.25
10.7028
2.0794
8.60
10.9504
2.1972
9.96
7.06565 Ks = 1171
1.68836 b = 1.69000
0.07563
0.99610
S
Z
CONTOUR
INCR.
ACCUM.
CONTOUR
AREA
VOL.
VOL.
STAGE
In S
In Z
Z est
[FT2]
[FTC]
[FT3]
[FT]
[FT]
149.00
0
0
0.0
150.00
345.39
173
173
1.0
5.1515
0.0000
1.00
151.00
560.40
453
626
2.0
6.4387
0.6931
2.01
152.00
795.39
678
1303
3.0
7.1728
1.0986
2.98
153.00
1060.70
928
2232
4.0
7.7104
1.3863
3.99
154.00
1305.85
1183
3415
5.0
8.1359
1.6094
5.02
154.50
1705.90
753
4168
5.5
8.3351
1.7047
5.59
Constant (y-Intercept)
5.15098 Ks =
173
Slope (X Coefficient)
1.84949 b =
1.85000
Standard Error of Coefficient
0.00861
R2 =
0.99996
Drainage Area
4.7
Total Drainage Area
4.7
% of Total
100%
Required % of Perm. Pool Volume
20%
% OF TOTAL PERMANENT POOL VOLUME
22.0% OKI

12.00
10.00
1:11iI41
EKili7
2.00
M M
Chainsaw Routing Results - 10 Year Design Storm
0 10 20 30 40 50 60
Time [min]
70 80 90 100
I Inflow
—M— Discharge