20211268 Ver 1_ePCN Application_20210820

DWR
mrlslon of Water Resources
Pre -Construction Notification (PCN) Form
For Nationwide Permits and Regional General Permits
(along with corresponding Water Quality Certifications)
June 1, 2021 Ver4.1
Initial Review
Has this project met the requirements for acceptance in to the review process?*
r Yes
r No
Is this project a public transportation project?*
r Yes r No
Change only if needed.
BIMS # Assigned
20211268
Is a payment required for this project?*
r No payment required
r Fee received
r Fee needed - send electronic notification
Reviewing Office*
Mooresville Regional Office - [phone]
'Information for Initial Review
la. Name of project:
Alexander Farms
la. Who is the Primary Contact?*
Alexander Farms MU, LLC
1b. Primary Contact Email:*
jesse@\Mndevelopment.net
Date Submitted
8/20/2021
Nearest Body of Water
McDowell Creek
Basin
Catawba
Water Classification
C
Site Coordinates
Latitude: Longitude:
35.4636-80.8845
A. Processing Information
County (or Counties) where the project is located:
Mecklenburg
Is this a NCDMS Project
r Yes r No
Is this project a public transportation project?*
r Yes r No
Pre -Filing Meeting Information
Version#*
1
What amout is owed?*
r $240.00
IT $570.00
Select Project Reviewer*
Alan Johnson:eads\adjohnson1
1c. Primary Contact Phone:*
[phone]
Is this a courtesy copy notification?*
r Yes r No

ID#
Version
Pre -fling Meeting or Request Date
7/6/2021
Attach documentation of Pre -Filing Meeting Request here:
nick the upload button or drag and drop files here to attach document
DWR Pre -Filing Meeting Request Form.pdf
File type mast be FCF
1a. Type(s) of approval sought from the Corps:
V Section 404 Permit (wetlands, streams and waters, Clean Water Act)
r Section 10 Permit (navigable waters, tidal waters, Rivers and Harbors Act)
Has this PCN previously been submitted?*
r Yes
r No
1b. What type(s) of permit(s) do you wish to seek authorization?
W Nationwide Permit (NWP)
r Regional General Permit (RGP)
r Standard (IP)
1c. Has the NWP or GP number been verified by the Corps?
r Yes r No
Nationwide Permit (NWP) Number:
Nationwide Permit (NWP) Number:
NWP Numbers (for multiple NWPS):
1d. Type(s) of approval sought from the DWR:
fJ 401 Water Quality Certification - Regular
r Non-404 Jurisdictional General Permit
r Individual 401 Water Quality Certification
39 - Commercial/Institutional Developments
29 - Residential Developments
le. Is this notification solely for the record because written approval is not required?
For the record only for DWR 401 Certification:
For the record only for Corps Permit:
49.06KB
r 401 Water Quality Certification - E)press
r Riparian Buffer Authorization
1f. Is this an after -the -fact permit application?*
r Yes r No
1g. Is payment into a mitigation bank or in -lieu fee program proposed for mitigation of impacts?
r Yes r No
1g. Is payment into a mitigation bank or in -lieu fee program proposed for mitigation of impacts?
r Yes r No
1h. Is the project located in any of NC's twenty coastal counties?
r Yes r No
1j. Is the project located in a designated trout watershed?
r Yes r No
B. Applicant Information
1d. Who is applying for the permit?
r Owner fJ Applicant (other than owner)
le. Is there an Agent/Consultant for this project?*
r Yes r No
2. Owner Information
2a. Name(s) on recorded deed:
B4LKN LLP
2b. Deed book and page no.:
r Yes r No
r Yes r No
2c.Contact Person:

Jeanette Stikeleather
2d.Address
Street Address
483 Barber Loop
Address Line 2
city
State / Rmince / Fbgion
Mooresville
NC
Postal / Zip Code
Country
28117
USA
2e. Telephone Number: 2f. Fax Number:
[phone]
2g. Email Address:*
[e-mail]
3. Applicant Information (if different from owner)
3a. Name:
Jesse McInerney
3b. Business Name:
Alexander Farms MU, LLC
3c.Address
Street Address
2165 Louisa Dr.
Address Line 2
Clly
State / Rwince / Region
Belleair Beach
Florida
Postal / Zip Code
(buntry
33786
USA
3d. Telephone Number: 3e. Fax Number:
[phone]
3f. Email Address:*
[e-mail]
4. Agent/Consultant (if applicable)
4a. Name:
Patrick Korn
4b. Business Name:
Terracon Consultants
4c.Address
Street Address
2701 Westport Road
Address Line 2
city
State / Rwince / Region
Charlotte
North Carolina
Postal / Zip Code
Country
28208
USA
4d. Telephone Number: 4e. Fax Number:
[phone]
4f. Email Address:*
[e-mail]
C. Project Information and Prior Project History
1. Project Information
1b. Subdivision name:
(if appropriate)
1c. Nearest municipality/ town:
Cornelius
2. Project Identification

2a. Property Identification Number:
00511105, 00511106, 00541108, 00541101
2b. Property size:
55.58
2c. Project Address
Street Address
18322 West Catawba Ave
Address tine 2
aty
Cornelius
Postal / Zip Code
28031
3. Surface Waters
3a. Name of the nearest body of water to proposed project:*
McDowell Creek
3b. Water Resources Classification of nearest receiving water:*
C
3c. What river basin(s) is your project located in?*
Catawba
3d. Please provide the 12-digit HUC in which the project is located.
030501011401
4. Project Description and History
State / Province / Iagion
North Carolina
Country
USA
4a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this application:*
The site is largely undeveloped, sans a historic farm house and other equipment storage areas. The land was historically used for farming and has been left to naturalize. The
surrounding area is mixed use residential commercial.
4b. Have Corps permits or DWR certifications been obtained for this project (including all prior phases) in the past?*
r Yes r No r Unknown
4f. List the total estimated acreage of all existing wetlands on the property:
0.28
4g. List the total estimated linear feet of all existing streams on the property:
1,265
4h. Explain the purpose of the proposed project:*
The proposed project would consist of developing master infrastructure and grading for commercial, retail, medical, senior housing, grocery, and single family developments to be
completed by others.
41. Describe the overall project in detail, including indirect impacts and the type of equipment to be used:*
The proposed project would consist of developing master infrastructure and grading for commercial, retail, medical, senior housing, grocery, and single family developments to be
completed by others.
The commercial, retail, grocery, and medical development sites would be located along West Catawba Ave and Westmoreland Road. The single family residential would occur on the
northern side of the stream and the senior housing facility would be constructed adjacent and on Wetland 1, Wetland 2, and Stream 1. The roadway infrastructure necessary to reach
the single family housing north of the stream would include a bottomless culvert that is situated outside of the OWHM of the stream, in the bank.
5. Jurisdictional Determinations
5a. Have the wetlands or streams been delineated on the property or proposed impact areas?*
r Yes r No
Comments:
5b. If the Corps made a jurisdictional determination, what type of determination was made?*
r Preliminary r Approved r Not Verified r Unknown r N/A
Corps AID Number:
SAW-2019-00824
5c. If 5a is yes, who delineated the jurisdictional areas?
Name (if known):
Agency/Consultant Company: Terracon Consultants
Other:
O Unknown
5d. List the dates of the Corp jurisdiction determination or State determination if a determination was made bythe Corps or DWR
01 /30/2020
6. Future Project Plans

6a. Is this a phased project?*
r Yes O No
6b. If yes, explain.
This proposed project would be for the development of master infrastructure necessary for the development of multiple future projects. Future projects would not have additional
impacts to aquatic features as all necessary impacts are included in this master infrastructure stage.
Are any other NWP(s), regional general permit(s), or individual permits(s) used, or intended to be used, to authorize any part of the proposed project or related activity?
No
D. Proposed Impacts Inventory
1. Impacts Summary
1a. Where are the impacts associated with your project? (check all that apply):
W Wetlands W Streams -tributaries r Buffers
r Open Waters r Pond Construction
2. Wetland Impacts
2a1 Reason (?) 2b. Impact type * (') 2c. Type of W. 2d. W. name * 2e. Forested * 2f. Type of 2g. Impact
Jurisdicition*(?) area*:=� -A
W1 Grading/Development P ffdplaln
Pool
Wetland 1
No
Corps
0.020
(acres)
ff
Grading/Development
P
rhodplaln Pool
Wetland 2
t
Corps
0.160
(acres)
2g. Total Temporary Wetland Impact
0.000
2g. Total Wetland Impact
0.180
21. Comments:
3. Stream Impacts
2g. Total Permanent Wetland Impact
0.180
3a. Reason for impact (?) 3b.lmpact type * 3c. Type of impact* name * 3e. Stream Type * 3f. Type of 3g. S. width* 3h. Impact
(?) Jurisdiction* length*
Gradin9 /DeveloP ment Permanent Fill E
Perennial Corps 2 347
1
Average (feet) (lirearfeet)
3i. Total jurisdictional ditch impact in square feet:
0
31. Total permanent stream impacts: 3i. Total temporary stream impacts:
347 0
31. Total stream and ditch impacts:
347
3j. Comments:
E. Impact Justification and Mitigation QV
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing the project:
This project avoids impacts to the majority of on site aquatic features and has been redesigned several times to fall under NWP thresholds.
1b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques:
Retention walls and a bottomless culvert that spans the OHWM of the stream are utilized to reduce necessary impacts from the required infrastructure
and grading.
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a. Does the project require Compensatory Mitigation for impacts to Waters of the U.S. or Waters of the State?
r Yes f No

2c. If yes, mitigation is required by (check all that apply):
F DWR W Corps
2d. If yes, which mitigation option(s) will be used for this project?
F Mitigation bank W Payment to in -lieu fee F Permittee Responsible
program Mitigation
4. Complete if Making a Payment to In -lieu Fee Program
4a. Approval letter from in -lieu fee program is attached.
r Yes r No
4b. Stream mitigation requested:
(linear feet)
347
4d. Buffer mitigation requested (DWR only):
(square feet)
4f. Non -riparian wetland mitigation requested:
(acres)
4h. Comments
4c. If using stream mitigation, what is the stream temperature:
warm
4e. Riparian wetland mitigation requested:
(acres)
4g. Coastal (tidal) wetland mitigation requested:
(acres)
F. Stormwater Management and Diffuse Flow Plan (required by DWR)
1. Diffuse Flow Plan
1a. Does the project include or is it adjacent to protected riparian buffers identified within one of the NC Riparian Buffer Protection Rules?
r Yes r No
If no, explain why:
2. Stormwater Management Plan
2a. Is this a NCDOT project subject to compliance with NCDOT's Individual NPDES permit NCS000250?*
r Yes r No
2b. Does this project meet the requirements for low density projects as defined in 15A NCAC 02H .1003(2)?
r Yes r No
2c. Does this project have a stormwater management plan (SMP) reviewed and approved under a state stormwater program or state -approved local government stormwater
program?
r Yes r No
r N/A- project disturbs < 1 acre
3. Stormwater Requirements
3a. Select whether a completed stormwater management plan (SMP) is included for review and approval or if calculations are provided to document the project will not cause
degradation of downstream surface waters.*
r Stormwater Management r Antidegradation
Plan Calculations
Comments
G. Supplementary Information
1. Environmental Documentation
1a. Does the project involve an expenditure of public (federal/state/local) funds or the use of public (federal/state) land?*
r Yes r No
2. Violations (DWR Requirement)
2a. Is the site in violation of DWR Water Quality Certification Rules (15ANCAC 2H .0500), Isolated Wetland Rules (15A NCAC 2H .1300), or DWR Surface Water or Wetland Standards or
Riparian Buffer Rules (15A NCAC 2B .0200)?*
r Yes r No
3. Cumulative Impacts (DWR Requirement)
3a. Will this project result in additional development, which could impact nearby downstream water quality?*

r Yes r No
3b. If you answered "no," provide a short narrative description.
All stormwater from this and future development will be treated on site.
4. Sewage Disposal (DWR Requirement)
4a. Is sewage disposal required by DWR for this project?*
r Yes r Nor N/A
5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a. Will this project occur in or near an area with federally protected species or habitat?*
r Yes r No
5b. Have you checked with the USFWS concerning Endangered Species Act impacts?*
r Yes r No
5c. If yes, indicate the USFWS Field Office you have contacted.
Asheville
5d. Is another Federal agency involved?*
r Yes r No
5e. Is this a DOT project located within Division's 1-8?
r Yes r No
5f. Will you cut any trees in order to conduct the work in waters of the U.S.?
r Yes r No
5g. Does this project involve bridge maintenance or removal?
r Yes r No
5h. Does this project involve the construction/installation of a wind turbine(s)?*
r Yes r No
r Unknown
Si. Does this project involve (1) blasting, and/or (2) other percussive activities that will be conducted by machines, such as jackhammers, mechanized pile drivers, etc.?
r Yes r No
5j. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical Habitat?
IPaC and on site habitat assessment that did not identify suitable habitat for listed species except for the Northern Long Eared bat. However the 4(d)
rule apply for the bat.
6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as an Essential Fish Habitat?*
r Yes r No
6b. What data sources did you use to determine whether your site would impact an Essential Fish Habitat?*
NOAA Essential Fish Habitat Mapper
7. Historic or Prehistoric Cultural Resources (Corps Requirement)
7a. Will this project occur in or near an area that the state, federal or tribal governments have designated as having historic or cultural preservation status?*
r Yes r No
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?*
Consultation with NC SHPO. This project has a property eligible for listing and coordination with the SHPO has commenced and will need input from
the USACE.
8. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA-designated 100-year floodplain?*
r Yes r No
8c. What source(s) did you use to make the floodplain determination?*
Polaris
Miscellaneous
Please use the space below to attach all required documentation or any additional information you feel is helpful for application review. Documents should be combined into one
file when possible, with a Cover Letter, Table of Contents, and a Cover Sheet for each Section preferred.

pick the upload button or drag and drop files here to attach docurrent
4598 - Alexander - Calc Book.pdf
12.18MB
4598-Alexander-Stream and Wetland Impacts.pdf
952.59KB
73197165 J Wilson Alexander Tenant House Report 8-21-19.pdf
4.13MB
Historical Letter - AF - 12.17.19.pdf
98.36KB
Species List_ Asheville Ecological Services Field Office.pdf
621.51 KB
File mist be PDF a 11,9
Comments
Signature
® By checking the box and signing below, I certify that:
• The project proponent hereby certifies that all information contained herein is true, accurate, and complete to the best of my knowledge and belief; and
• 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 have given true, accurate, and complete information on this form;
• I agree that submission of this PCN 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 PCN form.
Full Name:
Patrick R. Korn
Signature
6!�; P-ft"?10 � c�
Date
8/20/2021

United States Department of the Interior
FISH AND WILDLIFE SERVICE
Asheville Ecological Services Field Office
160 Zillicoa Street
Asheville, NC 28801-1082
Phone: [phone] Fax: [phone]
http://www.fws.p,ov/nc-es/es/coupiyfr.html
In Reply Refer To:
Consultation Code: 04EN1000-2021-SLI-1033
Event Code: 04EN1000-2021-E-02378
Project Name: Alexander Farms
August 20, 2021
Subject: List of threatened and endangered species that may occur in your proposed project
location or may be affected by your proposed project
To Whom It May Concern:
The attached species list identifies threatened, endangered, proposed and candidate species, as
well as proposed and final designated critical habitat, that may occur within the boundary of your
proposed project and/or may be affected by your proposed project. Although not required by
section 7, many agencies request species lists to start the informal consultation process and begin
their fulfillment of the requirements under section 7(c) of the Endangered Species Act (Act) of
1973, as amended (16 U.S.C. 1531 et seq.).
This list, along with other helpful resources, is also available on the U.S. Fish and Wildlife
Service (Service) —Asheville Field Office's (AFO) website: https://www.fws.gov/raleigh/species/
cntylist/nc counties.html. The AFO website list includes "species of concern" — species that
could potentially be placed on the federal list of threatened and endangered species in the future.
Also available are:
Design and Construction Recommendations
https://www.fws.gov/asheville/htmis/project review/Recommendations.html
Optimal Survey Times for Federally Listed Plants
https://www.fws.gov/nc-es/plant/plant survey.html
Northern long-eared bat Guidance
https://www.fws.gov/asheville/htmis/project review/NLEB in WNC.html
Predictive Habitat Model for Aquatic Species
https://www.fws.gov/asheville/htmls/Maxent/Maxent.html
New information based on updated surveys, changes in the abundance and distribution of
species, changed habitat conditions, or other factors could require modifications of these lists.

08/20/2021 Event Code: 04EN1000-2021-E-02378
Please note that under 50 CFR 402.12(e) of the regulations implementing section 7 of the Act,
the accuracy of the species lists should be verified after 90 days. This verification can be
completed formally or informally as desired. The Service recommends that verification be
completed by visiting the ECOS-IPaC website or the AFO website (the AFO website dates each
county list with the day of the most recent update/change) at regular intervals during project
planning and implementation for updates to species lists and information. An updated list may
be requested through the ECOS-IPaC system by completing the same process used to receive the
enclosed list or by going to the AFO website.
The purpose of the Act is to provide a means whereby threatened and endangered species and the
ecosystems upon which they depend may be conserved. Under sections 7(a)(1) and 7(a)(2) of
the Act and its implementing regulations (50 CFR 402 et seq.), Federal agencies are required to
utilize their authorities to carry out programs for the conservation of threatened and endangered
species and to determine whether projects may affect threatened and endangered species and/or
designated critical habitat.
A Biological Assessment is required for construction projects (or other undertakings having
similar physical impacts) that are major Federal actions significantly affecting the quality of the
human environment as defined in the National Environmental Policy Act (42 U.S.C. 4332(2)
(c)). For projects other than major construction activities, the Service suggests that a Biological
Evaluation similar to a Biological Assessment be prepared to determine whether the project may
affect listed or proposed species and/or designated or proposed critical habitat. Recommended
contents of a Biological Assessment are described at 50 CFR 402.12 and on our office's website
at https://www.fws.gov/asheville/htmis/project review/assessment guidance.html.
If a Federal agency (or their non-federal representative) determines, based on the Biological
Assessment or Biological Evaluation, that listed species and/or designated critical habitat may be
affected by the proposed project, the agency is required to consult with the Service pursuant to
50 CFR 402. In addition, the Service recommends that candidate species, proposed species, and
proposed critical habitat be addressed within the consultation. More information on the
regulations and procedures for section 7 consultation, including the role of permit or license
applicants, can be found in the "Endangered Species Consultation Handbook" at: http://
www.fws.gov/endangered/esa-library/pdf/TOC-GLOS.PDF.
Though the bald eagle is no longer protected under the Endangered Species Act, please be aware
that bald and golden eagles are protected under the Bald and Golden Eagle Protection Act (16
U.S.C. 668 et seq.), and projects affecting these species may require additional consultation (see
https://www.fws.gov/southeast/our-services/permits/eagles/). Wind energy projects should
follow the wind energy guidelines (http://www.fws.gov/windenerg_y/) for minimizing impacts to
migratory birds (including bald and golden eagles) and bats.
Guidance for minimizing impacts to migratory birds for projects including communications
towers (e.g., cellular, digital television, radio, and emergency broadcast) can be found at: http://
www. fws. gov/migratorybirds/CurrentBirdlssues/Hazards/towers/towers.htm;
http://www.towerkill.com; andhttp://www.fws.gov/migratoDbirds/CurrentBirdlssues/Hazards/
towers/comtow.html.

08/20/2021 Event Code: 04EN1000-2021-E-02378 3
We appreciate your concern for threatened and endangered species. The Service encourages
Federal agencies to include conservation of threatened and endangered species into their project
planning to further the purposes of the Act. Please include the Consultation Tracking Number in
the header of this letter with any request for consultation or correspondence about your project
that you submit to our office.
Attachment(s):
• Official Species List
• Migratory Birds
• Wetlands

08/20/2021 Event Code: 04EN1000-2021-E-02378
Official Species List
This list is provided pursuant to Section 7 of the Endangered Species Act, and fulfills the
requirement for Federal agencies to "request of the Secretary of the Interior information whether
any species which is listed or proposed to be listed may be present in the area of a proposed
action".
This species list is provided by:
Asheville Ecological Services Field Office
160 Zillicoa Street
Asheville, NC 28801-1082
[phone]

08/20/2021 Event Code: 04EN1000-2021-E-02378 2
Project Summary
Consultation Code: 04EN1000-2021-SLI-1033
Event Code: 04EN1000-2021-E-02378
Project Name: Alexander Farms
Project Type: DEVELOPMENT
Project Description: Multiuse Development
Project Location:
Approximate location of the project can be viewed in Google Maps: https:
www. google.com/maps/(a)35.4640237,-80.88366388130336,14z
LU
:11'a-xTY Dr
ILI, I C-I
Counties: Mecklenburg County, North Carolina

08/20/2021 Event Code: 04EN1000-2021-E-02378 3
Endangered Species Act Species
There is a total of 5 threatened, endangered, or candidate species on this species list.
Species on this list should be considered in an effects analysis for your project and could include
species that exist in another geographic area. For example, certain fish may appear on the species
list because a project could affect downstream species.
IPaC does not display listed species or critical habitats under the sole jurisdiction of NOAA
Fisheriesi, as USFWS does not have the authority to speak on behalf of NOAA and the
Department of Commerce.
See the "Critical habitats" section below for those critical habitats that lie wholly or partially
within your project area under this office's jurisdiction. Please contact the designated FWS office
if you have questions.
1. NOAA Fisheries, also known as the National Marine Fisheries Service (NMFS), is an
office of the National Oceanic and Atmospheric Administration within the Department of
Commerce.
Mammals
NAME STATUS
Northern Long-eared Bat Myotis septentrionalis Threatened
No critical habitat has been designated for this species.
Species profile: https:Hecos.fws.gov/ecp/species/9045
Clams
NAME STATUS
Carolina Heelsplitter Lasmigona decorata Endangered
There is final critical habitat for this species. The location of the critical habitat is not available.
Species profile: https:Hecos.fws.gov/ecp/species/3534
Flowering Plants
NAME
STATUS
Michaux's Sumac Rhus michauxii
Endangered
No critical habitat has been designated for this species.
Species profile: https:Hecos.fws.gov/ecp/species/5217
Schweinitz's Sunflower Helianthus schweinitzii
Endangered
No critical habitat has been designated for this species.
Species profile: https:Hecos.fws.gov/ecp/species/3849
Smooth Coneflower Echinacea laevigata
Endangered
No critical habitat has been designated for this species.
Species profile: https:Hecos.fws.gov/ecp/species/3473

08/20/2021 Event Code: 04EN1000-2021-E-02378
Critical habitats
THERE ARE NO CRITICAL HABITATS WITHIN YOUR PROJECT AREA UNDER THIS OFFICE'S
JURISDICTION.

08/20/2021 Event Code: 04EN1000-2021-E-02378
Migratory Birds
Certain birds are protected under the Migratory Bird Treaty Act! and the Bald and Golden Eagle
Protection Act2.
Any person or organization who plans or conducts activities that may result in impacts to
migratory birds, eagles, and their habitats should follow appropriate regulations and consider
implementing appropriate conservation measures, as described below.
1. The Migratory Birds Treat. Act of 1918.
2. The Bald and Golden Eagle Protection Act of 1940.
3. 50 C.F.R. Sec. 10.12 and 16 U.S.C. Sec. 668(a)
The birds listed below are birds of particular concern either because they occur on the USFWS
Birds of Conservation Concern (BCC) list or warrant special attention in your project location.
To learn more about the levels of concern for birds on your list and how this list is generated, see
the FAQ below. This is not a list of every bird you may find in this location, nor a guarantee that
every bird on this list will be found in your project area. To see exact locations of where birders
and the general public have sighted birds in and around your project area, visit the E-bird data
mapping tool (Tip: enter your location, desired date range and a species on your list). For
projects that occur off the Atlantic Coast, additional maps and models detailing the relative
occurrence and abundance of bird species on your list are available. Links to additional
information about Atlantic Coast birds, and other important information about your migratory
bird list, including how to properly interpret and use your migratory bird report, can be found
below.
For guidance on when to schedule activities or implement avoidance and minimization measures
to reduce impacts to migratory birds on your list, click on the PROBABILITY OF PRESENCE
SUMMARY at the top of your list to see when these birds are most likely to be present and
breeding in your project area.
BREEDING
NAME SEASON
Bald Eagle Haliaeetus leucocephalus
This is not a Bird of Conservation Concern (BCC) in this area, but warrants attention
because of the Eagle Act or for potential susceptibilities in offshore areas from certain types
of development or activities.
https:Hecos.fws.gov/ecp/species/1626
Eastern Whip -poor -will Antrostomus voci ferns
This is a Bird of Conservation Concern (BCC) throughout its range in the continental USA
and Alaska.
Breeds Sep 1 to
Jul 31
Breeds May 1
to Aug 20

08/20/2021 Event Code: 04EN1000-2021-E-02378
2
BREEDING
NAME SEASON
Prairie Warbler Dendroica discolor Breeds May 1
This is a Bird of Conservation Concern (BCC) throughout its range in the continental USA to Jul 31
and Alaska.
Red-headed Woodpecker Melanerpes erythrocephalus Breeds May 10
This is a Bird of Conservation Concern (BCC) throughout its range in the continental USA to Sep 10
and Alaska.
Rusty Blackbird Euphagus carolinus Breeds
This is a Bird of Conservation Concern (BCC) only in particular Bird Conservation Regions elsewhere
(BCRs) in the continental USA
Wood Thrush Hylocichla mustelina Breeds May 10
This is a Bird of Conservation Concern (BCC) throughout its range in the continental USA to Aug 31
and Alaska.
Probability Of Presence Summary
The graphs below provide our best understanding of when birds of concern are most likely to be
present in your project area. This information can be used to tailor and schedule your project
activities to avoid or minimize impacts to birds. Please make sure you read and understand the
FAQ "Proper Interpretation and Use of Your Migratory Bird Report" before using or attempting
to interpret this report.
Probability of Presence (■)
Each green bar represents the bird's relative probability of presence in the 10km grid cell(s) your
project overlaps during a particular week of the year. (A year is represented as 12 4-week
months.) A taller bar indicates a higher probability of species presence. The survey effort (see
below) can be used to establish a level of confidence in the presence score. One can have higher
confidence in the presence score if the corresponding survey effort is also high.
How is the probability of presence score calculated? The calculation is done in three steps:
The probability of presence for each week is calculated as the number of survey events in
the week where the species was detected divided by the total number of survey events for
that week. For example, if in week 12 there were 20 survey events and the Spotted Towhee
was found in 5 of them, the probability of presence of the Spotted Towhee in week 12 is
0.25.
2. To properly present the pattern of presence across the year, the relative probability of
presence is calculated. This is the probability of presence divided by the maximum
probability of presence across all weeks. For example, imagine the probability of presence
in week 20 for the Spotted Towhee is 0.05, and that the probability of presence at week 12
(0.25) is the maximum of any week of the year. The relative probability of presence on
week 12 is 0.25/0.25 = 1; at week 20 it is 0.05/0.25 = 0.2.

08/20/2021 Event Code: 04EN1000-2021-E-02378 3
3. The relative probability of presence calculated in the previous step undergoes a statistical
conversion so that all possible values fall between 0 and 10, inclusive. This is the
probability of presence score.
Breeding Season( )
Yellow bars denote a very liberal estimate of the time -frame inside which the bird breeds across
its entire range. If there are no yellow bars shown for a bird, it does not breed in your project
area.
Survey Effort (1)
Vertical black lines superimposed on probability of presence bars indicate the number of surveys
performed for that species in the 10km grid cell(s) your project area overlaps. The number of
surveys is expressed as a range, for example, 33 to 64 surveys.
No Data (—)
A week is marked as having no data if there were no survey events for that week.
Survey Timeframe
Surveys from only the last 10 years are used in order to ensure delivery of currently relevant
information. The exception to this is areas off the Atlantic coast, where bird returns are based on
all years of available data, since data in these areas is currently much more sparse.
probability of presence breeding season I survey effort — no data
SPECIES JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Bald Eagle _ _ J—
Non-BCC ++++ i��� AMAMfibad�, —+rt is il Jill -+ + rt+++
Vulnerable
will Eastern Whip -Poor- ++++ ++++ ++++ ++++ Jill Jill Jill Ill—
++++ ++++ +—++ +++
BCC Rangewide
(CON)
Prairie Warbler BCC Rangewide ++++ ++++ ++++ ++" 11MININ
III��N""' --+— ++++ ++++ +—++ —+++
(CON)
Red-headed ill
JillJill `■■■■'+++ +"Woodpecker +++, +'I I ++++ ++++ — +++
BCC Rangewide
(CON)
Rusty Blackbird ++ 1 1 1 1 1 11-1 1 1 1 1 1 1 4--+ ++++ — — — — --+— ++++ ++++ +—++ ��++
BCC -BCR
Wood Thrush pill"'
BCC Rangewide ++++ ++++ ++++ +++' +'—' ++ ++++ "++ +—++ —+++
(CON)

08/20/2021 Event Code: 04EN1000-2021-E-02378 4
Additional information can be found using the following links:
• Birds of Conservation Concern http://www.fws.gov/birds/management/managed-species/
birds-of-conservation-concern.php
• Measures for avoiding and minimizing impacts to birds http://www.fws.gov/birds/
management/project-assessment-tools-and-guidance/
conservation-measures.php
• Nationwide conservation measures for birds http://www.fws.gov/migratoI3Lbirds/pdf/
management/nationwidestandardconservationmeasures. pdf
Migratory Birds FAQ
Tell me more about conservation measures I can implement to avoid or minimize impacts
to migratory birds.
Nationwide Conservation Measures describes measures that can help avoid and minimize
impacts to all birds at any location year round. Implementation of these measures is particularly
important when birds are most likely to occur in the project area. When birds may be breeding in
the area, identifying the locations of any active nests and avoiding their destruction is a very
helpful impact minimization measure. To see when birds are most likely to occur and be breeding
in your project area, view the Probability of Presence Summary. Additional measures or permits
may be advisable depending on the type of activity you are conducting and the type of
infrastructure or bird species present on your project site.
What does IPaC use to generate the migratory birds potentially occurring in my specified
location?
The Migratory Bird Resource List is comprised of USFWS Birds of Conservation Concern
(BCQ and other species that may warrant special attention in your project location.
The migratory bird list generated for your project is derived from data provided by the Avian
Knowledge Network (AKN). The AKN data is based on a growing collection of survey, banding,
and citizen science datasets and is queried and filtered to return a list of those birds reported as
occurring in the 10km grid cell(s) which your project intersects, and that have been identified as
warranting special attention because they are a BCC species in that area, an eagle (Eagle Act
requirements may apply), or a species that has a particular vulnerability to offshore activities or
development.
Again, the Migratory Bird Resource list includes only a subset of birds that may occur in your
project area. It is not representative of all birds that may occur in your project area. To get a list
of all birds potentially present in your project area, please visit the AKN Phenology Tool.
What does IPaC use to generate the probability of presence graphs for the migratory birds
potentially occurring in my specified location?
The probability of presence graphs associated with your migratory bird list are based on data
provided by the Avian Knowledge Network (AKN). This data is derived from a growing
collection of survey, banding, and citizen science datasets .

08/20/2021 Event Code: 04EN1000-2021-E-02378 5
Probability of presence data is continuously being updated as new and better information
becomes available. To learn more about how the probability of presence graphs are produced and
how to interpret them, go the Probability of Presence Summary and then click on the "Tell me
about these graphs" link.
How do I know if a bird is breeding, wintering, migrating or present year-round in my
project area?
To see what part of a particular bird's range your project area falls within (i.e. breeding,
wintering, migrating or year-round), you may refer to the following resources: The Cornell Lab
of Ornithology All About Birds Bird Guide, or (if you are unsuccessful in locating the bird of
interest there), the Cornell Lab of Ornithology Neotropical Birds guide. If a bird on your
migratory bird species list has a breeding season associated with it, if that bird does occur in your
project area, there may be nests present at some point within the timeframe specified. If "Breeds
elsewhere" is indicated, then the bird likely does not breed in your project area.
What are the levels of concern for migratory birds?
Migratory birds delivered through IPaC fall into the following distinct categories of concern:
1. "BCC Rangewide" birds are Birds of Conservation Concern (BCC) that are of concern
throughout their range anywhere within the USA (including Hawaii, the Pacific Islands,
Puerto Rico, and the Virgin Islands);
2. "BCC - BCR" birds are BCCs that are of concern only in particular Bird Conservation
Regions (BCRs) in the continental USA; and
3. "Non -BCC - Vulnerable" birds are not BCC species in your project area, but appear on
your list either because of the Eagle Act requirements (for eagles) or (for non -eagles)
potential susceptibilities in offshore areas from certain types of development or activities
(e.g. offshore energy development or longline fishing).
Although it is important to try to avoid and minimize impacts to all birds, efforts should be made,
in particular, to avoid and minimize impacts to the birds on this list, especially eagles and BCC
species of rangewide concern. For more information on conservation measures you can
implement to help avoid and minimize migratory bird impacts and requirements for eagles,
please see the FAQs for these topics.
Details about birds that are potentially affected by offshore projects
For additional details about the relative occurrence and abundance of both individual bird species
and groups of bird species within your project area off the Atlantic Coast, please visit the
Northeast Ocean Data Portal. The Portal also offers data and information about other taxa besides
birds that may be helpful to you in your project review. Alternately, you may download the bird
model results files underlying the portal maps through the NOAA NCCOS Integrative Statistical
Modeling and Predictive Mapping of Marine Bird Distributions and Abundance on the Atlantic
Outer Continental Shelf project webpage.
Bird tracking data can also provide additional details about occurrence and habitat use
throughout the year, including migration. Models relying on survey data may not include this
information. For additional information on marine bird tracking data, see the Diving Bird Study
and the nanotag studies or contact Caleb Spiegel or Pam Lorin.

08/20/2021 Event Code: 04EN1000-2021-E-02378
What if I have eagles on my list?
If your project has the potential to disturb or kill eagles, you may need to obtain a permit to avoid
violating the Eagle Act should such impacts occur.
Proper Interpretation and Use of Your Migratory Bird Report
The migratory bird list generated is not a list of all birds in your project area, only a subset of
birds of priority concern. To learn more about how your list is generated, and see options for
identifying what other birds may be in your project area, please see the FAQ "What does IPaC
use to generate the migratory birds potentially occurring in my specified location". Please be
aware this report provides the "probability of presence" of birds within the 10 km grid cell(s) that
overlap your project; not your exact project footprint. On the graphs provided, please also look
carefully at the survey effort (indicated by the black vertical bar) and for the existence of the "no
data" indicator (a red horizontal bar). A high survey effort is the key component. If the survey
effort is high, then the probability of presence score can be viewed as more dependable. In
contrast, a low survey effort bar or no data bar means a lack of data and, therefore, a lack of
certainty about presence of the species. This list is not perfect; it is simply a starting point for
identifying what birds of concern have the potential to be in your project area, when they might
be there, and if they might be breeding (which means nests might be present). The list helps you
know what to look for to confirm presence, and helps guide you in knowing when to implement
conservation measures to avoid or minimize potential impacts from your project activities,
should presence be confirmed. To learn more about conservation measures, visit the FAQ "Tell
me about conservation measures I can implement to avoid or minimize impacts to migratory
birds" at the bottom of your migratory bird trust resources page.

08/20/2021 Event Code: 04EN1000-2021-E-02378
Wetlands
Impacts to NWI wetlands and other aquatic habitats may be subject to regulation under Section
404 of the Clean Water Act, or other State/Federal statutes.
For more information please contact the Regulatory Program of the local U.S. Army Corps of
Engineers District.
Please note that the NWI data being shown may be out of date. We are currently working to
update our NWI data set. We recommend you verify these results with a site visit to determine
the actual extent of wetlands on site.
FRESHWATER FORESTED/SHRUB WETLAND
• PF01A

North Carolina Department of Natural and Cultural Resources
State Historic Preservation Office
Ramona M. Bartos, Administcator
Governor Roy Cooper
Secretary Susi H. Hamilton
December 16, 2019
Bill Green
Terracon
521 Clemson Road
Columbia, SC 29229
[e-mail]
Office of Archives and History
Deputy Secretary Kevin Cherry
Re: Construct Commercial Building, 18322 & 18324 West Catawba Avenue, 8315 Westmoreland Road, and
18500 Caleb Jordan Drive, Cornelius, Mecklenburg County, ER 19-1985
Dear Mr. Green:
Thank you for your letter of November 13, 2019, transmitting the historic structure survey report, "Architectural
Evaluation of the J. Wilson Alexander Farm Tenant House, Mecklenburg County, North Carolina", and its
associated deliverables. We have reviewed the report and offer the following comments.
We concur with the report's findings that the J. Wilson Alexander Farm Tenant House (MK2293), which was placed
on the Stated Study List in 2002, is eligible for listing on the National Register of Historic Places under Criterion A
and Criterion C for the reasons cited in the report.
Demolition of eligible properties or the development of the surrounding landscape that has a negative impact on the
resource's integrity of feeling, setting, and association is considered an adverse effect. We reiterate that work known
to have an adverse effect on historic properties, and performed in preparation of a project, could be considered
"anticipatory" and poses a risk to Section 106 compliance, which could jeopardize permitting or cause a delay in the
process.
The above comments are made pursuant to Section 106 of the National Historic Preservation Act and the Advisory
Council on Historic Preservation's Regulations for Compliance with Section 106 codified at 36 CFR Part 800.
Thank you for your cooperation and consideration. If you have questions concerning the above comment, contact
Renee Gledhill -Earley, environmental review coordinator, at 919-814-6579 or environmental.reviewkncdcr.gov. In
all future communication concerning this project, please cite the above referenced tracking number.
Sincerely,
Ramona M. Bartos
Deputy State Historic Preservation Officer
cc: Steven Alafazanos, WIN Development LLC, [e-mail]
Location: 109 East Jones Street, Raleigh NC 27601 Mailing Address: 4617 Mail Service Center, Raleigh NC 27699-4617 Telephone/Fax: [phone]-6599

ARCHITECTURAL EVALUATION OF THE
J. WILSON ALEXANDER FARM TENANT HOUSE
Mecklenburg County, North Carolina
Terracon Project No. 73197165
August 2019
Prepared For:
Alexander Farms MU, LLC
2165 Louisa Drive
Belleair Beach, Florida 33786-3445
Prepared By:
Terracon Consultants, Inc.
521 Clemson Road
Columbia, South Carolina 29229

ARCHITECTURAL EVALUATION OF THE
J. WILSON ALEXANDER FARM TENANT HOUSE
MECKLENBURG COUNTY, NORTH CAROLINA
DRAFT REPORT
SHPO Review No.: ER 19-1985
Prepared For:
Alexander Farms MU, LLC
2165 Louisa Drive
Belleair Beach, Florida 33786-3445
Prepared By:
Irerracon
521 Clemson Road
Columbia, South Carolina
Project No. 73197165
Author:
Mills Dorn, M.H.P. and William Green, M.A.
William Green, M.A., RPA #10387
Principal Investigator
August 2019

Architectural Evaluation
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
MANAGEMENT SUMMARY
Terracon Consultants, Inc. (Terracon), on behalf of Alexander Farms MU, LLC, has completed an
architectural evaluation of the J. Wilson Alexander Tenant House located at 18324 West Catawba
Avenue in Cornelius, Mecklenburg County, North Carolina (Figures 1 and 2). The tenant house
is located within a proposed multi -family residential development that will require compliance with
Section 106 of the National Historic Preservation Act of 1966, as amended (54 U.S.C. § 300101
et seq.). The lead federal agency for the project is expected to be the U.S. Army Corps of
Engineers (USACE).
Based on a letter from Renee Gledhill -Earley of the North Carolina State Historic Preservation
Office (SHPO) to Ashley Keesling of Terracon dated July 18, 2019, the SHPO requested that an
architectural and historical evaluation of the J. Wilson Alexander Farm Tenant House (MK2293)
(ER No. 19-1985) be conducted. The property is currently listed as a "non -designated property"
with the Charlotte Mecklenburg Historic Landmarks Commission (CMHLC) and requires
additional study to determine whether it is eligible for listing in the National Register of Historic
Places (NRHP) and whether it should be designated as a local historic landmark.
The results of the investigation indicate that the J. Wilson Alexander Tenant House (MK2293), an
early twentieth century tenant house, is eligible for the NRHP under Criterion A for its association
with agriculture and tenant farming in Mecklenburg County, and under Criterion C for being one
of the few surviving examples of an early twentieth century tenant house located in the county.
Based on this, Alexander Farms MU, LLC, should begin consultation with the SHPO and CMHLC
on ways to resolve potential adverse effects to this historic property.
Responsive ■ Resourceful ■ Reliable

L'I'l /.
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Figure 1. Location of the J. Wilson Alexander Farm Tenant House.
Base Map: Lake Norman South (1979) 7.5' USGS topographic quadrangle.
J. Wilson Alexander Farm Tenant House
N
Irerracon TOPOGRAPHIC MAP Figure
w Date: August 2019 J. WILSON ALEXANDER
521 Clemson Rd. Columbia, SC TENANT FARM HOUSE
S PH. [phone] terracon.com MECKLENBURG CO., NC
•
pyright:®2,' National Geo • ra hy, i-cu
Project No. 73197165
Reviewed By: BGG
Drawn By: BGG

Figure 2. Aerial photograph showing the location of the J. Wilson
Alexander Farm Tenant House.
Base Map: ESRI World Imagery.
J. Wilson Alexander Farm Tenant House
N
w E
s
Project No. 73197165
Date: August 2019
Drawn By: BGG
Reviewed By: BGG
Irerracon TOPOGRAPHIC MAP Figure
J. WILSON ALEXANDER
521 Clemson Rd. Columbia, SC TENANT FARM HOUSE 2
PH. [phone] terracon.com MECKLENBURG CO., NC

Architectural Evaluation Irerracon
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
TABLE OF CONTENTS
MANAGEMENT SUMMARY.................................................................................................................... i
TABLE OF CONTENTS.........................................................................................................................
iv
FIGURES................................................................................................................................................ v
1.0 INTRODUCTION........................................................................................................................1
2.0 HISTORIC CONTEXT.................................................................................................................2
2.1 EARLY SETTLEMENT...................................................................................................2
2.2 EIGHTEENTH CENTURY..............................................................................................
3
2.3 NINETEENTH CENTURY.............................................................................................4
2.4 TWENTIETH CENTURY.................................................................................................4
2.5 HISTORY OF THE J. WILSON ALEXANDER TENANT HOUSE .....................................
5
2.5.1 Records Review.................................................................................................
5
2.5.2 Historic Map Review..........................................................................................6
2.5.3 History of the Property and Tenant House..........................................................8
3.0 ARCHITECTURAL EVALUATION..............................................................................................9
4.0 CONCLUSIONS.......................................................................................................................14
5.0 REFERENCES.........................................................................................................................
15
iv
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Architectural Evaluation Irerracon
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
FIGURES
Figure 1. Topographic map showing the location of the J. Wilson Alexander Tenant House ..................... ii
Figure 2. Aerial photograph showing the location of the J. Wilson Alexander Tenant House . .................... iii
Figure 3. Mouzon's (1775) map with a depiction of the approximate location of the tenant house ............. 6
Figure 4. 1865 map of North Carolina and South Carolina showing the approximate location of the tenant
house...................................................................................................................................................... 7
Figure 5. 1911 map of Mecklenburg County showing the approximate location of the location of the tenant
house...................................................................................................................................................... 7
Figure 6. Hicks Crossroads (1949) USGS Topographic map with the location of the tenant house. .
Figure 7. Resource No. MK2293, facing east..................................................................................
Figure 8. Resource No. MK2293, facing northeast..........................................................................
Figure 9. Resource No. MK2293, facing west................................................................................
Figure 10. Resource No. MK2293, facing southeast ..........................
Figure 11. Wellhouse, facing southeast .............................................
Figure 12. Garage, facing northwest .................................................
Figure 13. View from the tenant house to the road, facing northwest.
Figure 14. View from the tenant house to the road, facing southwest.
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Architectural Evaluation
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
1.0 INTRODUCTION
Terracon Consultants, Inc. (Terracon), on behalf of Alexander Farms MU, LLC, has completed an
architectural evaluation of the J. Wilson Alexander Tenant House located at 18324 West Catawba
Avenue in Cornelius, Mecklenburg County, North Carolina (Figures 1 and 2). The tenant house
is located within a proposed multi -family residential development that will require compliance with
Section 106 of the National Historic Preservation Act of 1966, as amended (54 U.S.C. § 300101
et seq.). The lead federal agency for the project is expected to be the U.S. Army Corps of
Engineers (USACE).
Based on a letter from Renee Gledhill -Earley of the North Carolina State Historic Preservation
Office (SHPO) to Ashley Keesling of Terracon dated July 18, 2019, the SHPO requested that an
architectural and historical evaluation of the J. Wilson Alexander Farm Tenant House (MK2293)
(ER No. 19-1985) be conducted. The property is currently listed as a "non -designated property"
with the Charlotte Mecklenburg Historic Landmarks Commission (CMHLC) and requires
additional study to determine whether it is eligible for listing in the National Register of Historic
Places (NRHP) and whether it should be designated as a local historic landmark.
The architecture evaluation was conducted on August 7, 2019, by Architectural Historian Mills
Dorn, M.H.P. This report has been prepared in compliance with the National Historic Preservation
Act of 1966, as amended (16 U.S.C. 470 et seq.); the National Environmental Policy Act of 1969,
as amended (42 U.S.C. 4321 et seq.); procedures for the Protection of Historic Properties (36
CFR Part 800); and 36 CFR Parts 60 through 79, as appropriate. The Principal Investigator and
Architectural Historian for the project meet the Secretary of the Interior's Professional Qualification
Standards (36 CFR Part 61).
Responsive ■ Resourceful ■ Reliable

Architectural Evaluation
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
2.0 HISTORIC CONTEXT
Mecklenburg County, located in the southern Piedmont of the North Carolina, is the most
populous county in the state with more than one million residents. It covers an area of
approximately 546 square miles and is bordered by Iredell County to the north, Cabarrus County
to the northeast, Union County to the southeast, Gaston County to the west, Catawba and Lincoln
counties to the northwest, and Lancaster and York counties, South Carolina, to the south and
southwest.
Mecklenburg County was created in 1762 from parts of Anson County, North Carolina. Within the
county is the largest city in North Carolina, Charlotte. Charlotte was named for Charlotte Sophia,
the wife of King George III. The county name Mecklenburg was named for Queen Charlotte's
home, Mecklenburg-Strelitz in Germany. Within the county are several other communities such
as Cornelius, Mint Hill, Davidson, Huntersville, Mathews, Allen, Paw Creek, Pineville, Newell, and
Caldwell (Martin 2016).
2.1 EARLY SETTLEMENT
The first area to be settled in North Carolina was known as the Albemarle, which extended from
Virginia to the north shore of Albemarle Sound in North Carolina. In 1663, King Charles II granted
the land that is now North and South Carolina to eight men that became the Lords Proprietors of
Carolina. Proprietor John Colleton first communicated with the other Lords Proprietors concerning
the settlement of the Carolinas by Barbadians. English planters from Barbados were restricted by
the amount of land available in Barbados and wanted to acquire more land for farming. While
waiting for acceptance of their settlement proposal, an expedition of 200 Barbadians under
Captain William Hilton on the ship Adventure set out in August 1663, to explore the Carolina
coast. Hilton's expedition was organized to explore from the Cape Fear River southward. As a
result of this expedition, a petition was sent to the Lords Proprietors requesting that the
Barbadians from the expedition be allowed to purchase a tract of one thousand square miles in
Carolina to be called the Corporation of the Barbadian Adventurers. The Proprietors rejected the
proposal, but the account of Hilton's voyage drew great interest in settling Carolina (Thomas 1930:
75-80).
John Vassall of Barbados kept the interest in settling the Lower Cape Fear region alive. Vassall
expressed interest to the Lords Proprietors for settling in Carolina, but the Proprietors chose to
negotiate with Colleton instead. In May of 1664, Vassall led close to 800 settlers from Barbados
to the Lower Cape Fear. Six months later, the settlement was incorporated into Clarendon County
(Lee 1965:41 and Moser and Jones 2010:18). This settlement was spread out along the banks of
the Cape Fear River. The settlement was primarily an agricultural community that also had a
lucrative trade market with Native Americans. This trading center was known as Charles Town,
which was founded approximately 20 miles upstream on the west bank of the Cape Fear River
and to the north of what would be known as Town Creek (Lee 1965:42). The settlement of Charles
2
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Architectural Evaluation
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
Towne was not successful due to lack of support from the Lords Proprietors, continued migration
of settlers, and increased fighting between settlers and Native Americans. John Vassall convinced
some settlers to stay their departure and held the colony together until 1667 when Clarendon
County was deserted. Many of the settlers relocated to Virginia and Massachusetts Bay (Lee
1965:48-52).
Settlement in the Piedmont did not become widespread until shortly before the American
Revolution. Before that time the main travel inland was done by the use of waterways. The fall
line makes travel inland by water very difficult due to the rapids and waterfalls that are located
past the fall line. Interest in migration to the Piedmont arose from the area's capacity for
constructing mills as well as the abundance in materials such as timber. Travel into the area was
done by the use of two major roads, The Great Indian Trading Path and the Great Wagon Road.
These routes started in the Virginia and Pennsylvania and extended into the Piedmont of North
Carolina (Stockard 1902:11).
2.2 EIGHTEENTH CENTURY
Before the settlement of Europeans, the area of Mecklenburg was home to the Catawba Indians.
European settlement in the Piedmont did not become widespread until shortly before the
American Revolution. Before that time the main travel inland was done by the use of waterways.
The fall line made travel inland by water very difficult due to the rapids and waterfalls that are
located past the fall line. Interest in migration to the Piedmont arose from the area's capacity for
mills as well as the abundance in materials such as timber. Travel into the area was done by the
use of two major roads, the Great Indian Trading Path and the Great Wagon Road. These routes
started in the Virginia and Pennsylvania and extended into the Piedmont of North Carolina
(Stockard 1902:11).
The first immigrants into the Piedmont were the Scots -Irish or Ulster Scots, German Lutherans,
Moravians, and English. The Scots -Irish originated from Northern Ireland and settled in
Pennsylvania. In the 1730s many of them started to spread further south into North Carolina. They
settled on small farms growing wheat and tobacco as cash crops to be exported elsewhere in the
colonies and to Europe. Others started gristmills, sawmills, and tanneries along the waterways in
the Piedmont. German Lutherans traveling into the Piedmont travelled the same routes into North
Carolina, starting settlements along the Catawba and Yadkin rivers. Moravians, also German
immigrants, settled in the area that is present day Salem, North Carolina. The Moravians
constructed planned congregational communities (Powell 1989). During the 1750s more
Europeans started to arrive in the area. These settlers established a town on an Indian trading
path between the Yadkin and Catawba rivers. The town was called "The Square," later to become
the City of Charlotte (Martin 2016).
During the American Revolution, Mecklenburg County became a hot bed for resistance against
the British monarchy. A two -week skirmish was fought near the area known as the battle of
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Architectural Evaluation
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
Charlotte. After the end of the battle British General Lord Cornwallis retreated from the area
referring to it as a "hornet's nest" (Martin 2016) After the battle the county passed the Mecklenburg
Declaration of Independence on May 20, 1775 (Martin 2016)
2.3 NINETEENTH CENTURY
Like most in the North Carolina Piedmont many residents in Mecklenburg County participated in
agriculture as an occupation. During 1860 only 1,065 residents lived in the City of Charlotte. Until
the later half of the nineteenth century many operated small farming operations and were not
considered planters or plantation owners. The dividing line between farmers and planters were
the number of slaves they owned. The ownership of over 25 slaves meant that a farmer then
became a planter. Before 1860 the number of planters in the county numbered approximately 17,
after 1860 that number rose to 30. Planter families in the county included Alexander, Ardrey, Bell,
Caldwell, Davidson, Davis, Grier, Johnston, Kirkpatrick, Lawing, Mills, Morris, Morrow, Patterson,
Parks, Potts, Walker, Wallace, and White (Jaycees 1971:1).
During the Civil war there were no major battles in Mecklenburg. The largest effects of the war
were the loss of infrastructure such as railroads that were destroyed to prevent their use by the
Union and the freeing of African -American slaves. These led to a rise in tenant farming in many
areas of Mecklenburg. Cotton continued to be a leading cash crop in the area and farming was
still a much -needed occupation. Many African -Americans met this need and became tenant
farmers in Mecklenburg and the towns within (Brotherton 1993:22)
2.4 TWENTIETH CENTURY
One of the towns within Mecklenburg that became a focal point for tenant farming and cotton
production was the town of Cornelius. In 1905, Cornelius was incorporated; it was the fifth
incorporated town in Mecklenburg County. Before the town was created the area was the center
of one of the largest rural churches in the area, Mount Zion Methodist Church. The church was
constructed after the land was deeded by Alexander Washam in 1828 (Brotherton 1993:23).
Cornelius became home to a bustling cotton industry. In 1891, a cotton mill was constructed by
R.J. Stough with the help of his brother-in-law Joseph Cornelius. The Stough -Cornelius Mill was
constructed and employed 45 people and housed 1,000 spindles. After the creation of the town
six more cotton mills were constructed. Cornelius boomed and became and large cotton
manufacturing and trading town during the 1900s. the area went through many changes during
the rest of the twentieth century. In 1916, a devastating flood impacted the area from a hurricane
that struck North Carolina.
The most recent significant event to impact the area of Cornelius was the construction of Lake
Norman. Construction took place on the dam from 1957-1962, which blocked water from the
Catawba River to create the lake. Lake Norman covers an area of 32,000 acres, part of which
4
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Architectural Evaluation
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
was the town of Cornelius. The construction of this reservoir significantly changed the landscape
surrounding the town and altered the economy, shifting it away from agriculture due to the loss of
land (Brotherton. 1993: v).
2.5 HISTORY OF THE J. WILSON ALEXANDER TENANT HOUSE
After the end of the Civil War many African -Americans that were former slaves were left with no
money or place to live. Land was difficult to come by during this period and with very little if any
money it was difficult for African -Americans to purchase it. A new system, known as tenant
farming or sharecropping, was adopted by the former plantation owners in need of laborers to
continue with farming. This system became dominant in Mecklenburg as well as other areas in
the south. Tenant or sharecropping allowed African Americans to rent houses and land for farming
from white land owners while in turn providing the profits to the land owner for the use of the land.
Once committed to this form of agriculture it was very difficult to exit the practice. It was an
inefficient means of farming single crops and the low pay created debts that tenant and
sharecroppers could not escape (Gray and Stathakis 2002:9-10).
Although not much history has been recorded about the house in particular, the J. Wilson
Alexander Tenant House is one of the last surviving examples of a tenant farming house in
Mecklenburg County as many have been demolished due to the expansion of towns and cities
such as Charlotte. Constructed in 1900, the J. Wilson Alexander Tenant house is simple and
followed the hall -and -parlor plan with a single fire place. An addition was constructed on the rear
of the house around 1910 giving the house a third room and second chimney (Charlotte -
Mecklenburg Historic Landmarks Commission 2019).
2.5.1 Records Review
Background research for the project was conducted on August 1, 2019, using HPOWeb, a
database inventory of previously recorded historic resources in North Carolina. In addition, deed
research was conducted at the Mecklenburg County Register of Deeds and the 2002
comprehensive survey of historic sites, buildings, and districts of African -American Resources of
Mecklenburg County (Gray and Stathakis 2002) was examined for more in-depth information
regarding the J. Wilson Alexander Tenant House. In that survey the J. Wilson Alexander Tenant
House was indicated as possibly being significant and was added to the SHPO's study list as
Resource No. MK2293. The standing structures included a single residential dwelling and two
historic outbuildings. Deed research conducted at the Mecklenburg County Register of Deeds
revealed that the property has been within the Alexander family for many years with the original
property being divided by the Alexander Family. The current property on which the tenant house
is located was acquired by J. Wilson Alexander in 1903, through the division of land owned by Eli
Alexander.
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Architectural Evaluation
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
2.5.2 Historic Map Review
In addition to the records review, eighteenth through twentieth century maps were examined to
determine whether any historic resources were present near the project. On Henry Mouzon's
1775 An Accurate Map of North and South Carolina with their Indian Frontiers the project is west
of the Catawba River, with no settlements near the area. To the west is the location of the
residence of a Colonel Alexander and a mill named Col. Alexander's Mill (Figure 3). On an 1865
map of North Carolina & South Carolina by the U.S. Coast Survey, the area of the structure is
west of an unnamed road and south of the Alexandria Post Office (Figure 4). Spratt's 1911 map
of Mecklenburg County shows a structure south of the J. Wilson Alexander Tenant house labeled
Mrs. Alexander (Figure 5). The 1949 Hicks Crossroads USGS topographic quadrangle shows the
J. Wilson Alexander Tenant House located adjacent to West Catawba Avenue (Figure 6).
w -4 t
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Figure 3. Mouzon's (1775) map showing the approximate location of the tenant house.
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Architectural Evaluation
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
1rerracon
\
r I
Figure 4. 1865 map of North Carolina and South Carolina showing the approximate location of the
tenant house.
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Figure 5. 1911 map of Mecklenburg County showing the location of the tenant house.
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Architectural Evaluation
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
r
Irerracon
Figure 6. Hicks Crossroads (1949) USGS topographic map showing the location of the tenant house.
2.5.3 History of the Property and Tenant House
The J. Wilson Alexander Tenant House is located on the same property as the J. Wilson
Alexander Farm. The Alexanders are of Scots -Irish decent and immigrated to the American
Colonies around 1740, traveling to Chester County, Pennsylvania. Shortly before the American
Revolution the family settled in Mecklenburg County, fighting for the patriot cause during the war.
The family was prominent in the county during this time, having six Alexanders sign the
Mecklenburg Declaration of Independence in 1775 (Partridge 2019).
The property was originally owned by Eli Alexander as part of a larger parcel of land. According
to deed research the property was divided into smaller parcels, one of which is the property
distributed to J. Wilson Alexander in 1903. James Wilson Alexander was born in Mecklenburg
County in 1887 and attended Rutherford College. He became a prominent farmer in Mecklenburg
County and served as chairmen on the Board of Directors of Farmers Company. James Wilson
Alexander was also important for taking part in the improvement of rural roads and providing
electricity and phone service to the rural areas of Mecklenburg County (Wyatt 2019). Very little
information is known about the residents of the tenant house associated with the J. Wilson
Alexander Farm. According to an interview with nearby resident Edith Henderson conducted
during the 2002 African -American Resources survey, the house was occupied by an African -
American farmer named John Norman (Gray and Stathakis 2002).
8
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Architectural Evaluation re
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
3.0 ARCHITECTURAL EVALUATION
An architectural evaluation was conducted to evaluate the J. Wilson Alexander Tennant House
for inclusion in the NRHP and as a local historic landmark with the CMHLC. The J. Wilson
Alexander Tenant House (Resource No. MK2293) is a ca. 1900 one-story vernacular house
located at 18324 W. Catawba Avenue. The property is associated with the J. Wilson Alexander
Farm, which is located south of the tenant house. This parcel has been in the Alexander family
since the 1830s. The tenant house is currently vacant but was once the home of a tenant farmer
named John Norman.
The tenant house is a symmetrical two room house with clapboard siding (Figures 7 through 12).
Roofing materials on the house consist of pressed sheet metal roofing. A partial veranda is
located on the east facade, facing W. Catawba Avenue. An exterior brick chimney is located on
the south elevation of the structure. The windows on the house consist of four over four double
hung sash windows flanking the front entry door and along the sides and rear elevation. A historic
ca. 1910 rear addition is located on the west elevation of the house with a chimney located within
the roof surface. Located north of the house are two historic outbuildings consisting of a wellhouse
and garage. Landscape features consist of large trees.
This structure has remained on its original site of construction and retains its original materials. it
has retained integrity in location, materials, and feeling. However, there is no particular
workmanship style and the historic setting of the house has been disrupted due to the close
proximity of W. Catawba Avenue (Figures 13 and 14).
In regard to the National Register Criteria for Evaluation (National Register Bulletin 15):
Criterion A— Resource No. MK2293 is associated with African -American history and tenant
farming in Mecklenburg County during the late nineteenth and early twentieth century.
Criterion B — Resource No. MK2293 has no known association with the lives of significant
persons in our past.
Criterion C — Resource No. MK2293 represents the characteristics of a ca. 1900 tenant
house in Mecklenburg County and is a small hall -and -parlor form dwelling constructed from
timber framing.
Criterion D — Resource No. MK2293 is unlikely to yield significant information about the
history of Mecklenburg County.
This property displays distinctive architectural features and characteristics of a rural tenant house
in Mecklenburg County and conveys significance through its association with tenant farming in
the county. Based on this evaluation, the J. Wilson Alexander Tenant House (MK2293) is
9
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Architectural Evaluation
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
recommended eligible for inclusion in the NRHP under Criterion A for its association with
agriculture and tenant farming in Mecklenburg County, and under Criterion C for being one of the
few surviving examples of an early twentieth century tenant house located in the county.
Figure 7. Resource No. MK2293, facing east.
Figure 8. Resource No. MK2293, facing northeast.
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Architectural Evaluation
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
Figure 9. Resource No. MK2293, facing west.
Figure 10. Resource No. MK2293, facing southeast.
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Architectural Evaluation Irerracon
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
Figure 13. View from the tenant house to the road, facing northwest.
Figure 14. View from the tenant house to the road, facing southwest.
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Architectural Evaluation
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
4.0 CONCLUSIONS
The results of the investigation indicate that the J. Wilson Alexander Tenant House (MK2293), an
early twentieth century tenant house, is eligible for inclusion in the NRHP under Criterion A for its
association with agriculture and tenant farming in Mecklenburg County, and under Criterion C for
being one of the few surviving examples of an early twentieth century tenant house located in the
county. Based on this, Terracon recommends that Alexander Farms MU, LLC, and the USACE
begin consultation with the SHPO and CMHLC on ways to resolve potential adverse effects to
this historic property.
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Architectural Evaluation
Alexander Farm Tenant House Mecklenburg Co., NC
August 2019 Terracon Project No. 73197165
5.0 REFERENCES
Brotherton, Marvin K.
1993 Lake Norman -Piedmont History, Davidson, North Carolina: Warren Publishing.
Charlotte -Mecklenburg Historic Landmarks Commission
2019 Mecklenburg African American Resources Survey, Charlotte, North Carolina: Charlotte -
Mecklenburg Historic Landmarks Commission, http://landmarks commission.org.
Connor, R. D. W.
1919 History of North Carolina: The colonial and Revolutionary Periods 1584 — 1783, Vol. 1,
New York and Chicago: The Lewis Publishing Company.
Cornelius Jaycees
1971 The History of Cornelius, Cornelius, North Carolina: www.Cornelius.org.
Gray, Stewart, and Paula Stathakis
2002 Survey of African American Resources and sites in Mecklenburg County, Raleigh, North
Carolina: North Carolina Department of Natural and Cultural Resources,
https://www.ncdcr.gov.https://www.ncdcr.gov/about/history/division-historical-
reso u rces/state-h istori c-preservation-office/arch itectu ral-10
Martin, Jonathan
2016 Mecklenburg County (1762). north carol inahistory.org, August 9, 2019.
http://northcarolinahistory.org/encyclopedia/mecklenburg-county-1762/
Partridge, Dennis
2019 Origin of the Alexander Families of Mecklenburg County, North Carolina Genealogy,
northcarolinagenealogy.org. https:Hnorthcarolinagenealogy.org/mecklenburg/
alexander families.htm
Powell, William S.
1989 North Carolina Through Four Centuries. University of North Carolina Press, Chapel Hill.
Ready, Milton
2005 The Tar Heel State. University of South Carolina Press, Columbia.
Wyatt, Deb B.
2019 James Wilson Alexander (15 Sep 1887 — 1 Feb 1972), https:Hfindagrave.com, August 14,
2019, https://www.findagrave. com/memorial/35731992/james-wlson-alexander.
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Charlotte
Raleigh
ColeJenest
& Stone
Shaping the Environment
Realizing the Possibilities
Land Planning
Landscape Architecture
Civil Engineering
Urban Design
200 South Tryon Street, SuiteL400
Charlotte, North Carolina28202
p+ 704 376 1555 f+ 704 376 7851
url+ www.colejeneststone.coni
ALEXANDER FARMS
CJS # 4598
CALCULATIONS FOR:
STORMWATER DETENTION & WATER QUALITY
STORM DRAINAGE ANALYSIS
EROSION CONTROL
DATE:
REV.-
08/02/21
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City of Charlotte
Land Development Division
Post Construction Controls / Detention Worksheet
The following sections help to provide information on volume and peak controls for the site. Attach BMP Inset
tables and Design Procedure Forms for each BMP to show that each is sized appropriately per the design
requirements.
Project Description: Attach brie ex lanation o detention plans and any assumptions if necessary.
Alexander farms is a 54.71 acre mixed -use development in Cornelius within the McDowell/Mt Island Lake protected area.
The stormwater will be controlled with two stormwater ponds. 12.22 acres will be routed to a double sandfilter/detention
pond and 35.48 acres will be routed to a wet pond. The Sand filters and Wet pond will provide optimal water quality
treatment, Channel protection volume, and control peak flows. A small undeveloped portion (DA-3 Post Map-2.0) of the
site are will not be routed to treatment.
PRE -DEVELOPED SUMMARY
Basin area: 51.00 ac (On -site routed areas total). (Delineated on attached drainage area map — total
HydroCAD routed area)
Time of Concentration, Tcpre: 25.1 for DA-1 and 40.8 minutes for DA-2 (Based on the SCS Method) (Tc path
shown on attached PRE MAP-1.0) Reference 3.9.6 of the Charlotte -Mecklenburg Storm Water Design Manual
— SCS Travel Time.
Curve Number, Cnpre: 69 for DA-1 and 70 for DA-2
POST -DEVELOPED SUMMARY
Basin area: 51 ac (12.22 ac to SF, 35.48 ac to wet pond, and 3.31 ac untreated) (Delineated on attached
drainage area POST MAP-2.0)
Time of Concentration, Tcpost: 5 min for treated areas and 11.2 min for DA-4 (stream buffer area). (Based
on the SCS Method) (Tc path shown on attached Post MAP-2.0) Reference 3.9.6 of the Charlotte -Mecklenburg
Storm Water Design Manual — SCS Travel Time.
Runoff Coefficient, Rv- DA-1 to SandFilter and DA-2 to Wetpond combined = 0.50 Water Quality Volume,
WQv (ac-ft)- DA-1 + DA-2 = 1.97
Curve Number, Cnpost: 84 (DA-1 + DA-2 weighted)
Curve Number, CNpost(modified)- 94 (DA-1 + DA-2 weighted
Channel Protection Volume, CPv (ac-ft)- 4.71 (DA-1+DA-2)
CPv Release Rate (cfs) 0.25
Revised: October 2010
Page 1 of 5

DETENTION SUMMARY
Computer Method Used*: HydroCAD
*Land Development Plan Review Staff will verb all detention submittals using HEC-1 for compliance with the City of Charlotte Zoning Ordinance,
Section 12.6. This summary is to accompany all detention analysis and is not intended to replace that requirement.
Pre (cfs)
Post (cfs)
Routed (cfs)
Elevation (Comments)
F
N/A
0.56
52.78
761.85 SF & 750.08 WP
1 yr.
N/A
4.63
86.74
763.04 SF & 751.52 WP
2 yr.
N/A
-
-
-
10 yr.
68.68
54.29
210.47
763.85 SF & 752.72 WP
25 yr.
97.46
95.20
262.75
764.19 SF & 753.27 WP
50 yr.
N/A
124.63
303.59
764.39 SF & 753.81 WP
100 yr.
N/A
149.97
344.59
764.54 SF & 754.27 WP
Note- 2-year storm is required only for sites required detention per Chapter 12 of the zoning ordinance. If a downstream
analysis has been performed, submit complete justification for the results
PRE -DEVELOPED SUB -BASIN CALCULATIONS:
Sub -basin Name/Level: DA-1 (See attached drainage area Pre MAP-1.0)
Type of Flow
Travel Length (ft.)
Slope (%)
Mannings (n)
Time (min.)
Sheet Unpaved
270
3
0.15
18.7
Sheet Paved
Shallow Conc. (Unpaved)
300
5.9
-
1.26
Shallow Conc. Paved
Channel
1,540
-
Assumed 5 ft/sec
5.2
Pipe
TOTAL
N/A
N/A
N/A
Tc Pre = 25.1 minutes
Acreage
Land Use
Soil Type
Hydrologic Group
CN
Weighted CN
(Acreage/rotal Area) x (Cl)
0.24
B it in 7
98
0 5
036
1 Gravel
96
07
9.41
Woods
EnD
B
55
10.2
1328
Grass/open space
EnD
B
61
159
6.27
Woods
CeB2.H B B
C
70
8.6
1.93
Grass/open sace
CeB2 HeB & VaB
C
74
2.8
9.47
Woods
EnB
D
77
14.3
10,03
Grass/open space
EnB
D
80
15.7
51.00
Cvrre = 69
Revised: October 2010
Page 2 of 5

Sub -basin Name/Level: DA-2 (See attached drainage area Pre MAP-1.0)
Type of Flow
Travel Length (ft.)
Slope (%)
Mannings (n)
Time (min.)
Sheet Unpaved
100
2.5
0.6
27.5
Sheet Paved
Shallow Conc. (Unpaved)
203
3.2
-
1.2
Shallow Conc. Paved
Channel
1,818
-
Assumed 2.5 ft/sec
12.1
Pipe
TOTAL
N/A
N'A
N/A
Tc pre = 25.1 minutes
Acreage
Land Use
Soil Type
Hydrologic Group
CN
Weighted CN
(Acreage/rotal Area) x (Cl)
1.8
Impervious
98
18.5
2.82
1 Woods
EnD
B
55
16.3
297
Grass
EnD
B
61
190
0.35
Woods
EnB
D
77
2.8
1.58
Grass
EnB
D
1 80
1 13.3
9.53
CNPre = 70
Revised: October 2010
Page 3 of 5

POST -DEVELOPED SUB -BASIN CALCULATIONS:
Sub -basin Name/Level: DA-1 (see Post MAP-1.0)
Type of Flow
Travel Length (ft.)
Slope (%)
Mannings (n)
Time (min.)
TOTAL
N/A
N/A
N/A
TC post = 5 MIN
Acreage
Land Use
Soil Type
Hydrologic Group
CN
Weighted CN
(Acreage/Total Area) x (Cl)
2.88
Buildinas
98
23.1
3.53
1 Pavement
98
28.3
0.89
Sidewalks
98
7.1
2.46
Landscaped
EnD
B
61
12.3
2.46
Landscaped
EnB
D
80
1 16.1
12.22
CNrost= 87
Sub -basin Name/Level: DA-2 (see Post MAP-1.0)
Type of Flow
Travel Length (ft.)
Slope (%)
Mannings (n)
Time (min.)
TOTAL
N/A
N/A
N/A
Tc = 5 MIN
Acreage
Land Use
Soil Type
Hydrologic Group
CN
Weighted CN
(Acreage/Total Area) x (Cl)
7.13
B ildinas
98
19.7
7.16
1 Pavement
98
19.8
2
Sidewalks
98
5.5
96
Landscaped
EnD
B
61
165
9 6
L ndscaped
EnB
D
80
1 21.6
35.48
CNrost= 83
Revised: October 2010
Page 4 of 5

Sub -basin Name/Level: DA-3 (see Post MAP-1.0)
Type of Flow
Travel Length (ft.)
Slope (%)
Mannings (n)
Time (min.)
Sheet Unpaved
100
2.5
0.6
27.5
Sheet Paved
-
-
-
Shallow Conc. (Unpaved)
203
3.2
-
1.2
Shallow Conc. Paved
-
-
Channel
1,000
-
-
6.7
Pipe
947
-
-
3.2
TOTAL
N/A
N/A
N/A
Tc post = 38.5 MIN
Acreage
Land Use
Soil Type
Hydrologic Group
CN
Weighted CN
(Acreage/Total Area) x (Cl)
1.8
Impervious
98
18.5
2.82
1 Woods
EnD
B
55
16.3
2.97
Grass
EnD
B
61
19.0
0.35
Woods
EnB
D
77
2.8
1.58
Grass
EnB
D
80
1 13.3
9.53
CNpost= 70
Sub -basin Name/Level: DA-4 (see Post MAP-1.0)
Type of Flow
Travel Length (ft.)
Slope (%)
Mannings (n)
Time (min.)
Sheet Unpaved
84
19
0.5
9.2
Sheet Paved
Shallow Conc. (Unpaved)
58
10
-
0.18
Shallow Conc. Paved
Channel
551
-
-
1.9
Pipe
TOTAL
N/A
N/A
N/A
Tc post = 11.2 MIN
Acreage
Land Use
Soil Type
Hydrologic Group
CN
Weighted CN
(Acreage/Total Area) x (Cl)
2.32
Woods
EnB
D
77
53.9
0 99
rass
I EnB
I D
1 80
1 24.0
3.31
CNpost= 78
Revised: October 2010
Page 5 of 5

STORAGE / DISCHARGE CALCULATIONS
*(If applicable) Complete Underground Storage Volume Table
Elevation
Underground *
Above Ground
Total Ace. Volume (cf)
Ace. Volume for all
Structures (cf)
Area (sq. ft.)
Inc. Volume (cf)
Ace. Volume (cf)
(Above and
Underground)
SEE HYDROCAD
STAGE -STORAGE
Elevation /
Orifice 1
Orifice 2
Weir 1
Weir 2/Em.
Outlet
Emergency
Total Q
Stage
In.
In.
Ft.
Spillway
Control Pipe
Spillway
(cfs)
(ft)
Inv.
Inv.
Inv.
(Controlled by
Ilia.
(Free flow out of
Area
Area
Cw=
outlet pipe/struct)
Length
pond)
Co=
Co—
Ft.
Inv.
Ft.
Inv.
Co=
Inv.
Cw=
Cw=
SEE HYDROCAD
STAGE -DISCHARGE
Stage Discharge
Co= orifice coefficient: Cw = weir coefficient. Orifice Area unit shall be square feet (sf).
Underground Storage Volume Table (Ifapplicable)
Provide additional storage volume tables if more structures are used.
Elevation
Ace. Volume (cf)
Underground Structure #
Length (ft.)
Size/dia (ft.)
Upper inv.
Lower inv.
Slope (%)
Ace. Volume (cf)
Underground Structure #
Length (ft.)
Size/dia (ft.)
Upper inv.
Lower inv.
Slope (%)
Ace. Volume (cf)
Underground Structure #
Length (ft.)
Size/dia (ft.)
Upper inv.
Lower inv.
Slope (%)
Ace. Volume (cf)
Underground Structure #
Length (ft.)
Size/dia (ft.)
Upper inv.
Lower inv.
Slope (%)
N/A
13
ENGINEERING & PROPERTY
MANAGEMENT
Revised: October 2010 Land DevIo niortt Rivision
600 East Fourth Street, Chan& --I kh Carolina 28202-2844
Telephone:[phone] Fax:[phone] landpermits.charmeck.org

4.8.7 Design Procedure Form
Design Procedure Form: Sand Filter
BIORETENTION FEASIBILITY
1 Is the use of a sand filter appropriate?
2 Confirm other design criteria and applicability.
Pollutant Removal Effectiveness Required
PRELIMINARY HYDROLOGIC CALCULATIONS
3 Compute site hydrologic input parameters
Development Conditions
Area
CN (SCS curve number)
Adjusted CN (curve number adjusted for 1-inch storm)
Time of concentration
4 Compute,WQv water quality volume requirements
Compute Runoff Coefficient, Rv
Compute WQv Volume requirements
5 Compute WQp peak flow using SCS
Compute modified SCS curve number
6 Compute CPv
Compute S (maximum retention)
Compute 1-yr, 24-hrtotal rainfall depth
Compute Qd (runoff volume)
Compute CPv (chnnnel protection volume)
7 Size Flow Diversion Structure
8 Compute release rates
Compute WQv release rate
Compute CPv release rate
SAND FILTER DESIGN
9 Compute sediment chamber volume
Volpre = (0.20)(WQv)
10 Average height of water above filter bed
Determine Area of Sand ponding/filter area
11 Set design eleveations and dimensions of facility
12 Develop stage -discharge and stage storage
Elevation
NOTES:
With 12.22 totaal drainage acres there will be 2 sand
filters. The Forebay berm will serve as a level spreader
and distribute equal flow to Sand Filter 1 & 2
Optimal
Pre -developed Post -developed
12.22 acres 12.22 acres
69 87
95.38
25.1 min 5 min
0.42 hours 0.08 hours
Rv =
0.59
WQV =
0.60 acre-ft
WQp =
15.84 cfs
CN =
95.4
S = 1.49
Rainfall Depth = 2.58 inches
Qd = 1.38 inches
CPV = 1.40 acre-ft
Release Rate = 0.142 cfs
Release Rate = 0.283 cfs
Volpre = 0.120 acre-ft
hf = 1_0 ft
Af = 2503.4 ft2
Length = 80 ft
Width = 22.0000 ft
Top Elevation = 760 ft
Area (ft) Volume (ft) Acc. Vol Q
(ft) (cfs)
SEE HYDROCAD
STAGE/STORAGE
Ch rl-M.*Wb.q
STORM
WATER
seM;­

Ch rl-M.kWWq
STORM
WATER
seM-
13 Route flows through bioretention area. Resize the footprint
area, if desired. Step is most effective for facilities with flow
diverters. Ensure detention time requirements and
maximum ponding depth requirements are met.
14 Design conveyance to facility
15 Size underdrain system I Length = 420 ft
16 Design emergency overflow I Length of Weir (if used) = 16 ft
17 Prepare vegetation and landscaping plan I Notes:

4.2.7 Design Procedure Form
Design Procedure Form: Wet pond
WET POND FEASIBILITY
1 Is the use of a wet pond appropriate?
2 Confirm other design criteria and applicability.
Pollutant Removal Effectiveness Required
PRELIMINARY HYDROLOGIC CALCULATIONS
3 Compute site hydrologic input parameters
Development Conditions
Area
CN (SCS curve number)
Adjusted CN (curve number adjusted for 1-inch storm)
Time of concentration
4 Compute,WQv water quality volume requirements
Compute Runoff Coefficient, Rv
Compute WQv Volume requirements
NOTES:
Optimal
Pre -developed Post -developed
35.48 acres 35.48 acres
69 83
93.25
25.1 min 5 min
0.42 hours 0.08 hours
Rv = 0.46
WQv = 1.370 acre-ft
5 Compute WQp peak flow using SCS I WQp = 36.25 cfs
Compute modified SCS curve number CN = 93.25
6 Compute CPv
Compute S (maximum retention) S = 2.05
Compute 1-yr, 24-hr total rainfall depth Rainfall Depth = 2.58 inches
Compute Qd (runoff volume) Qd = 1.12 inches
Compute CPv (chnnnel protection volume) CPv = 3.30 acre-ft
Estimate tc (time of concentration) tc = 0.08 hours
Compute approximate storage volume
7 Compute release rates
Compute WQv release rate
Compute CPv release rate
STORM WATER DETENTION BASIN DESIGN
Storage volume = 6.11 acre-ft
Release Rate = 0.167 cfs
Release Rate = 0.666 cfs
8. Pretreatment volume
Volpe = Acres of Impervious Area(0.2")(1'712") WQpre = 0.272 acre-ft
9. Compute Permanent Pool Volume and
Water Quality Extended Volume
Compute WQv/PPv
Compute PPv
Size extended detention — pool volume is greater
of WQv or CPv
10. Conduction grading and determine storage available
for permanent pool (and WQv- ED volume if applicable)
WQv/PPv = 0_3
PPv = 4.57 acre-ft
ED Pool Volume = 3.30 acre-ft
Prepare an elevation -storage table and curve using
the average area method for computing volumes.
Ch rl-M.*Wb.q
STORM
WATER
seM;­

Ch rl-M.*Wb.q
STORM
WATER
seM;­
Elevation
Area
Average
Depth
Incremental Volume
Cumulative
Volume
Area
Volume
above
Permanent
Pool
MSL
acres
acres
ft
acre-ft
acre
acre-ft
SEE HYDROCAD
STAGE -STORAGE
12. WQv Orifice Computations
Average ED release rate
Release Rate =
0.167 cfs
Average head, In = (ED elev. — Permanent pool elev.) / 2
In =
0.8 ft
Area of orifice from orifice equation: Q = CA(2gh)0.5
A =
0.039 ft2
Diameter =
2.68 in
13. Compute release rate for CPv control and
Establish CPv elevation
WSEL =
751.52 ft
Release rate
Release Rate =
1.117 cfs
Average head In = CPv elev. — Permanent pool elev.) / 2
In =
1.5 ft
Area or orifice from orifice equation: Q = CA(2gh)05
A =
0.189 ft2
Diameter =
5.88 in
14. Calculate Qp release rate and water surface elevation
Set up a stage -storage
-discharge relationships.
Peak stage for (WQv), the 1-inch, 6-hour storm
Peak Stage =
750.08 ft
Peak stage for (CPv), the 1-yr, 24-hour storm
Peak State =
752.21 ft
Peak Q10 — Undeveloped
Q10-undev =
68.68 cfs
Peak Q10 — Developed
Q10-dev =
54.29 cfs
Peak Q25 — Undeveloped
Q25-undev =
97.46 cfs
Peak Q25 — Developed
Q25-dev =
95.2 cfs
Size emergency spillway, calculate 50-year WSEL
WSEL50 =
753.81 ft
and set top of embankment elevation
Embankment Elevatio
755.5 ft
15. Investigate potential wet detention basin hazard
Notes:
classification
16. Assess maintenance access and safety features.
17.Attach landscaping plan

HydroCAD Stage -Storage

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE Printed 8/11/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 4
Summary for Pond 36P: SAND FILTER/DETENTION
Inflow Area = 12.217 ac, 0.00% Impervious, Inflow Depth = 3.49" for 50-yr event
Inflow = 80.07 cfs @ 3.15 hrs, Volume= 3.555 of
Outflow = 54.61 cfs @ 3.25 hrs, Volume= 3.554 af, Atten= 32%, Lag= 5.8 min
Primary = 54.61 cfs @ 3.25 hrs, Volume= 3.554 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 764.39' @ 3.25 hrs Surf.Area= 18,320 sf Storage= 62,912 cf
Plug -Flow detention time= 365.4 min calculated for 3.554 of (100% of inflow)
Center -of -Mass det. time= 365.3 min ( 572.4 - 207.2 )
Volume Invert Avail.Storage Storage Description
#1 760.00' 79,733 cf Custom Stage Data (Irregular)Listed below (Recalc)
Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area
(feet) (sq-ft) (feet) (cubic -feet) (cubic -feet)
760.00 10,534 547.0 0 0 10,534
761.00 12,209 569.0 11,361 11,361 12,566
762.00 13,945 588.0 13,067 24,429 14,408
763.00 15,739 607.0 14,833 39,262 16,311
764.00 17,589 626.0 16,655 55,917 18,275
765.00 19,496 644.0 18,534 74,451 20,202
765.25 22,799 676.0 5,281 79,733 23,567
Device Routing Invert Outlet Devices
#1 Primary 756.00' 30.0" Round 30" RCP L= 116.8' Ke= 0.200
Inlet / Outlet Invert= 756.00' / 755.25' S= 0.0064 T Cc= 0.900
n= 0.013 Concrete, trowel finish, Flow Area= 4.91 sf
#2 Device 1 760.00' Sand Filter 1 & 2
Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00
Disch. (cfs) 0.000 0.200 0.257 0.314 0.371 0.428 0.428
#3 Device 1 762.00' 3.0" Vert. CPV control C= 0.600 Limited to weir flow at low heads
#4 Device 1 763.00' Custom Weir/Orifice FLOOD STORM, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 1.75
Width (feet) 9.00 9.00 16.00 16.00
Primary OutFlow Max=54.24 cfs @ 3.25 hrs HW=764.38' (Free Discharge)
L1=30" RCP (Passes 54.24 cfs of 67.18 cfs potential flow)
12=Sand Filter 1 & 2 (Custom Controls 0.39 cfs)
3=CPV control (Orifice Controls 0.36 cfs @ 7.24 fps)
4=Custom Weir/Orifice FLOOD STORM (Weir Controls 53.49 cfs @ 3.53 fps)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE
Printed 8/11/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC
Page 6
Summary for Pond 41 P: WET POND
Inflow Area
= 35.478 ac,
0.00% Impervious, Inflow Depth = 3.10" for 50-yr event
Inflow
= 210.43 cfs @
3.15 hrs, Volume= 9.170 of
Outflow
= 59.67 cfs @
3.41 hrs, Volume= 8.829 af, Atten= 72%, Lag= 15.5 min
Primary
= 59.67 cfs @
3.41 hrs, Volume= 8.829 of
Routing by
Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Starting Elev=
748.50' Surf.Area= 31,630 sf Storage= 209,326 cf
Peak Elev=
753.81' @ 3.41 hrs
Surf.Area= 45,404 sf Storage= 420,275 cf
(210,949 cf above start)
Plug -Flow detention time= 1,594.9
min calculated for 4.023 of (44% of inflow)
Center -of -Mass det. time= 720.9
min ( 931.3 - 210.4 )
Volume
Invert Avail.Storage Storage Description
#1
738.00' 479,780 cf POND STORAGE (Irregular)Listed
below (Recalc)
499,894 cf Overall - 20,114 cf Embedded = 479,780 cf
#2
738.00' 8,046 cf RIP -RAP DISPLACEMENT (Prismatic)Listed below (Recalc) Inside #1
20,114 cf Overall x 40.0% Voids
487,826 cf Total Available Storage
Elevation
Surf.Area
Perim. Inc.Store Cum.Store
Wet.Area
(feet)
(sq-ft)
(feet) (cubic -feet) (cubic -feet)
738.00
13,948
603.0 0 0
13,948
739.00
15,175
623.0 14,557 14,557
15,993
740.00
16,443
644.0 15,805 30,362
18,203
741.00
17,752
664.0 17,093 47,455
20,385
742.00
19,100
681.0 18,422 65,877
22,325
743.00
20,476
694.0 19,784 85,661
23,905
744.00
21,879
708.0 21,174 106,835
25,617
745.00
23,309
721.0 22,590 129,425
27,259
746.00
24,765
734.0 24,033 153,458
28,931
747.00
26,247
747.0 25,502 178,961
30,633
748.00
27,753
759.0 26,996 205,957
32,256
748.50
31,630
791.0 14,835 220,792
36,222
749.00
35,679
823.0 16,817 237,610
40,352
750.00
37,655
854.0 36,663 274,272
44,573
751.00
39,603
879.0 38,625 312,897
48,128
752.00
41,610
903.0 40,602 353,499
51,646
753.00
43,677
928.0 42,639 396,139
55,402
754.00
45,806
952.0 44,737 440,876
59,113
755.00
47,996
977.0 46,897 487,773
63,070
755.25
48,976
983.0 12,121 499,894
64,038
Elevation
Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
738.00
1,820
0 0
748.50
1,820
19,110 19,110
748.51
1,000
14 19,124
749.50
1,000
990 20,114

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE Printed 8/11/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 7
Device
Routing
Invert
Outlet Devices
#1
Primary
747.30'
42.0" Round 42" RCP OUTFALL
L= 52.9' RCP, mitered to conform to fill, Ke= 0.700
Inlet / Outlet Invert= 747.30' / 747.00' S= 0.0057 T Cc= 0.900
n= 0.013 Concrete pipe, bends & connections, Flow Area= 9.62 sf
#2
Device 1
748.50'
2.5" Horiz. INVERTED WATER QUALITY ORIFICE C= 0.600
Limited to weir flow at low heads
#3
Device 1
750.25'
4.3" Vert. 4.25" ORIFICE C= 0.600
Limited to weir flow at low heads
#4
Device 1
751.75'
4' WIDE X 1.25' TALL WEIR X 2.00, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.25
Width (feet) 4.00 4.00
#5
Device 1
754.00'
EMERGENCY WEIR X 4.00, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00
Width (feet) 5.00 5.00
Primary OutFlow Max=59.61 cfs @ 3.41 hrs HW=753.81' (Free Discharge)
L1=42" RCP OUTFALL (Passes 59.61 cfs of 89.17 cfs potential flow)
2=INVERTED WATER QUALITY ORIFICE (Orifice Controls 0.38 cfs @ 11.09 fps)
3=4.25" ORIFICE (Orifice Controls 0.89 cfs @ 8.85 fps)
4=4' WIDE X 1.25' TALL WEIR (Orifice Controls 58.34 cfs @ 5.83 fps)
5=EMERGENCY WEIR ( Controls 0.00 cfs)
Pond 41 P: WET POND
Hydrograph
2210.43
-+--+--'----L--'---'----r--------r------+--+------L--�--
--r--�r--�i--�--r--�r--�i--�--r--�r--�i--7--r--�r-�--r--�r--�i--�--r--r
- -
■ Inflow
■ Primary
CfS
220
--------------
----------
--
---=
jnfto� Arlo#=�=6-4781ao_-
210
---+--+--r----+--+--r----+--r--r
-r -i- -i- + -
200
190
---
-- --
----
--
-------
--
-------
180
170
---
----'--'-------------------------------'�
--r--
----
--r--
------r-------T
---- --r - --
vT-age=
160
-li--y--+--Ir--li--I--r--Ir--li--rt--r--Ir--li--+--r----+--+--r----+--+--r--
150
----------------------------------------------------------------
140
---
-- --
----
--
-------
--
-------+--
---- -- -- ---- -- -----
w 130
u
" 120
---J--1--L--1--1--L--1---1--1--L--1---'--1--L--1--J--1--L--1--1--L--1---
0 110
-1-----
r--r----
--r-------
--r-------7--r----
--r--r------r-----
LL100
----------------------------------------------------------------
90
---
--+--+--i--
--+-----i--
--r-------+--r--i--
--+--+--i----+--i---
59.67 cfs
--------------------------------------------------------------
60
--
--r--
----
--r--
------r-------T--r----
--r-- ---- --r-- --
50
--J--
--L--'--
--L--1---1--1--L--1-----1--L--1--J--1--L--1--
--L--'---
40
--r--r--r--i--r--r--r--i--r--r--r--i--r--r--r-r--r--r--i--r--r--r--
30 ---'--'---'---'---'--'---'---'---'--'---'---'---------------------------'---
20
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)

HydroCAD Stage -Discharge

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE Printed 8/2/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 3
Stage -Discharge for Pond 36P: SAND FILTER/DETENTION
Elevation Primary
(feet)
(cfs)
760.00
0.00
761.00
0.20
762.00
0.26
763.00
0.54
764.00
30.17
765.00
70.23
766.00
74.91

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE Printed 8/2/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 7
Stage -Discharge for Pond 41 P: WET POND
Elevation Primary
(feet)
(cfs)
738.00
0.00
739.00
0.00
740.00
0.00
741.00
0.00
742.00
0.00
743.00
0.00
744.00
0.00
745.00
0.00
746.00
0.00
747.00
0.00
748.00
0.00
749.00
0.12
750.00
0.20
751.00
0.63
752.00
4.19
753.00
37.74
754.00
63.53
755.00
99.71

HYDROCAD ROUTING

1" - 6 HR STORM WATER QUALITY

30S
DA-1 (PRE MAP-1.0)
49L
4HS COMBINED PRE
DEVELOPED
DA-2 (PRE MAP-1.0)
46S /36\P
DA-1 CNm (POST SAND
MAP-2.0) FILTER/DETENTION
61 S 41 P
DA-2 CNm (POST WET POND 42L
MAP-2.0)
47S COMBINED POST
DEVELOPED FLOW
DA-3 Bypass (POST
MAP-2.0)
45S
DA-4 Stream Buffer
(Post Map 2.0)
Subcat Reach on Link Routing Diagram for 4598 - ALEXANDER FARMS STORMWATER CONTROL
Prepared by COLEJENEST & STONE, Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC

4598 - ALEXANDER FARMS STORMWATER CONTRO Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 30S: DA-1 (PRE MAP-1.0)
Runoff = 0.08 cfs @ 5.84 hrs, Volume= 0.010 af, Depth= 0.00"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 1-inch Rainfall=1.00"
Area (sf) CN Description
2,221,641 69 Weighted CN
2,221,641 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
25.1 Direct Entry, TC
Subcatchment 30S: DA-1 (PRE MAP-1.0)
Hydrograph
---i
0.0-- -- --I _I-- -- --I _I-- -- - --I _I-- -- --I _I-- -- -_ ■Runoff
o.o8 0.08 cfs
0.08 I ClQtie -%1 - J �LG
-I-+--+---------+--+-------,--+--I-
i] 1
0.075-+I--+--+--+--I----+--r-----I----+--r-----I---Cnft=e�--
0.07---------------------------------------------�--
0.065--1--1--L--1-----J--+--L- - - -
RunDff Arear2,221,641_ sf_ -
0.06--'----------------------------'-- Rtjnbff-VbFume-0.01 af
0.055
w 0.05-'lRunbff' D6D h=4 00,`•
3 0.045 11 �--i1 1 1 1 1 i
0.04 T-q= 5.,J-Mip
---
0.035
0.03 ---+--+---+----+--+---------+------+--+--+--------+--+--
0.025 -J--1--L----1--J--1--L--1-------1--L--1---1--1--1--L--1--J--1--+--
0.02--1--1--L--1-----J--L--L-----'-- -- -- -------1--L--L-------1--+--
0.015
0.01
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)

4598 - ALEXANDER FARMS STORMWATER CONTRO Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 48S: DA-2 (PRE MAP-1.0)
Runoff = 0.02 cfs @ 5.95 hrs, Volume= 0.004 af, Depth= 0.00"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 1-inch Rainfall=1.00"
Area (sf) CN Description
414,981 70 Weighted CN
414,981 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
40.8 Direct Entry, TC
Subcatchment 48S: DA-2 (PRE MAP-1.0)
Hydrograph
--'----- ' --'--'---'---'--' --'--'---'-- '--' --'--'---'-- ' --'--'---'---'--' -- � -- ■Runoff
0.02r--��---��--�--�--+--��---��--�--r-- --��---��--�--�--��--��---��--�--r--
0.0220.021
-----------------=----------'--
I
I I I I I
C
RaInfaI[=;1_A1)0r--
0.02
--'-- --
--------'--
--
-----'--
--
-------'--
'J�UnbffAJreA�4141981-tf-
0.018
----t--t-------y--t--r-------y--0.019
0.017
0.016
--I--r--r--r--I--r--+--r--r--I--r--
r--I- r--+--r--I-----+- -r
0.015
0.014
----r--r--r----r--r--r--r----r--r--r-----I--r--r--r-}-,I---I/-�-r/�--r--
-----'--'-----------'---'----------------F�unoff
D"t&O.00'� -
3 0.013
0 0.012
LL
i
----7--r--r----r--r--r--r----r--r--r--r----r--r--r-----yip--7--yr�--
--'---'--'---'---'---'--'----------------------------
T�40-8 rhiI
0.01
�1y=�
0.009
----T--r--I
--I--T--T--r--I
-- I - - T-
- r--T--I--- I--T--T--r-
-I- - T- --
0.008
i
--1--1--L--1-----J--L--L-----'--
I
--
--r-------1--L--L-------1--r--
I
0.007
ITrr--ITT
--r-
-�
--ITrrI-ITTTI-IT--r--
0.006
--1--1--L--1-----J--1--L--1---'--
--
--r-------1--1--L--1-----1--r--
I
0.005
--Trr--TT--r--
--Trr-TTT-T--r--
0.004
------r-------
--T--r-------
--T--r-------
--T---------T--r--
0.003
----T--
r
T--
T--
r
T--
r--r 7--T--T------- T--r--
0.002
-----r-------
--T--r-------
--T--r-------
--T---------T--r--
0.001
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)

4598 - ALEXANDER FARMS STORMWATER CONTRO Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 13
Summary for Link 49L: COMBINED PRE DEVELOPED
Inflow Area = 60.529 ac, 0.00% Impervious, Inflow Depth = 0.00" for 1-inch event
Inflow = 0.11 cfs @ 5.85 hrs, Volume= 0.013 of
Primary = 0.11 cfs @ 5.85 hrs, Volume= 0.013 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 49L: COMBINED PRE DEVELOPED
Hydrograph
----
---
--1--L-J--1--L--1--J--L--L-J--1--L--1--J--L--L----J--L--'--J--
+--
-- ---+--
------+--
---- +------ -- +-- ---------- -,--
❑ Inflow
0.11
--r--r-
--t--r----
--r--r-
--7--r------r--r-------r---- --
❑Primary
ifs
0.1 0.11
- ----------
-------
a=
0.105 ,'
-+--+--+-+--+--+-+--+--+--+-+--
.59S
-+----+--+---- S--
0.1
-----------------�,--
---------------�,--
--------�,-------�,-- --
0.095
---+--'--
--+--L--'--
--+--L-
--+--L--'----+--L--'----L----1--
0.09
---+--L-J--+--L----
--+-
-L-J-
-+- -L- --- --r--L----L--L--I--J--
0.085-J--J--'--J--J--L--'--J--J--L-J--J--L--'--J--J--L--'--J--L--'--J--
0.08
-+--+--r-+--+--r-+--+--+--r-+--+--r----+--+--r-+--+--r----+--
0.075 �,
---
-----;--
--�
0.07
---+----
--+--L----
--+--L-
--+--L------+--L------L----J--
0.065
0.06
- --1--1--J--1--L--1--J--1--L-L--+--L----J--1--L--1--L--L----L--
00.055
-,--r----
--T--r----,--r--r----7--r----,--r--r-------r----
--
LL0.05
------------------------------
-1------------
0.045
-+--+--+-+--+--+-+--+--+--+-+--+--+----+--+--+-+--+--+----+--
0.04
- --
-_
- - -, --
-_
- --
, -- --
-_
-
--, ---_ - --, -- ---_ - --, -- --;-----,--
0.035
-J--1--'--J--1--L--'--J--1--L-J--1--L----J--1--L----L--L----L--
0.025
-J--1--'--J--1--L--'--J--1--L-J--J--L----J--1--L----J--L----J--
0.02
+
r-
+
r--
+
r-
7--r------r--r--i----r--i-- --
0.015
--'--'---'---'--'---'---'---'--'---'---'---'--'---'---'--'---'---'---'--'---'---'--
0.01
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)

4598 - ALEXANDER FARMS STORMWATER CONTRO Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 46S: DA-1 CNm (POST MAP-2.0)
Runoff = 15.84 cfs @ 3.16 hrs, Volume= 0.574 af, Depth= 0.56"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 1-inch Rainfall=1.00"
Area (sf) CN Description
532,153 95 Sand Filter CNm
532,153 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, TC
Subcatchment 46S: DA-1 CNm (POST MAP-2.0)
Hydrograph
-----------'---'-----------------'---' ---'-----------------'---' ---'-----'--- ■Runoff
15.84 cfs ----- --------------------- -- ------------------ ------
----
---;--;--;--;-- ;--;--;-0h kr1gtt',e- 1�r-j='inch -
15--------+--+--+--+--r-------+--+--+--+--r--+-------+--+--+--r--r--
14--------- -- -- --------------------- --L-----Rainfall;;1_0011
13- z - - - - - - � RiUr ;off ATe&532 1-53 sf -
-------------------------------------------------------------------
11---------;-- --r-- ---------;----�npffypI I 'e=0. $74 elf -
w 10 -r-------r--r--r--r--r-------r--r--r--t--
Runfi D�pthT�6 -
0 8
_' _ _ I AC:;* 0 -W I i 1-1- -
i 1 1
7-------- -- -- --------------- -- -- --------------- - gN=96
5
r--i---i--r--r--r--r--r--r--i--r--r--r--r--r--r--r--i--r--r--r--r--r--
4 --------+--+--+--+----------+--+--+--+--+--+-------+--+--+--+--+--
3--'---'----1--L----1---1---1--J--1--1--1--L--+-------r----i--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)

4598 - ALEXANDER FARMS STORMWATER CONTRO Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 7
Summary for Subcatchment 61S: DA-2 CNm (POST MAP-2.0)
Runoff = 36.95 cfs @ 3.16 hrs, Volume= 1.332 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
Charlotte 6-hr 1-inch Rainfall=1.00"
Area (sf) CN Description
1,545,417 93 wet pond CNm
1,545,417 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 61S: DA-2 CNm (POST MAP-2.0)
Hydrograph
36.95cfs III---I--�--rt--t--r----- I ---
I--y--rt--rt--t--r--Ir--I---I--�--�--t--r--Ir-
■ Runoff
-11---11---11----r T --T --I-----II----T--T- T
--- 'hlar�ot e�6- =111C -
36 � 1 i r
34------I-- -- -- -- -----------I-- -- -- -------I-Aa--fall I1-."-
I I I I I I I I I I I I I I I I I IDOI
32 _I J---- -- Y
----in
---------------
I I I I I I I I I I I I I I I I I I I L I I I I
30-------I----1--L----1---1---1--J--1---Runof Arlear-t,545,41T I I I I I I I I I I I I
28-------I----1--L----1---1---1--J--1--1--+--L---------J--1--+--+-- --
Ruflof b1Urhe"1-MZ d -
-------I
+I V
24--+---++- +--R+-n--o+f-�e- p1h+ 45h1r--
-
22 ' I -----I-------- ---- - ---- ---'------ T---- -- -- - -u
-------�C=5T6-Ini20 1111 T-T-T -r -
E 18- - - - - -- r-
----- -
16------------� --�---------------- --�--------------�-
I I I I I I I I I I I I I I I I I I I
14------I---------------------I-- -- --
-----------------------------
12------I----1--L----1---1---1--J--1--1--1--L--L--1---1--J--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
10 --------+--+--+--+----------+--+--+--+--+--+-------+--+--+--+--+--
----------+--+--------------+--+--+-----------+----+--+--�--
6--
i
4 - - - - - -II- - 1 - - T - - 1 - - 1 - - - - - - - -II- - 1 - - 1 - - 1 - - T - - 1 - -II - - - - -II- - 1 - - 1 - - T - - 1 - - Ir - -
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)

4598 - ALEXANDER FARMS STORMWATER CONTRO Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 5
Summary for Subcatchment 47S: DA-3 Bypass (POST MAP-2.0)
Runoff = 0.02 cfs @ 5.93 hrs, Volume= 0.004 af, Depth= 0.00"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 1-inch Rainfall=1.00"
Area (sf) CN Description
414,982 70 Weighted CN
414,982 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
38.5 Direct Entry, TC
Subcatchment 47S: DA-3 Bypass (POST MAP-2.0)
Hydrograph
-----'-- 1 -- L-- - --'-- L -- L -- L _ _'---'-- L -- L -- L--'---'-- 1 -- L --L--'---'-- 1 -- L --
---- ----- T- - - ------T--T-------,--T--T---------T-- T-- I - --I - - T --T
-
- ■Runoff
0.02 cfs - --L1-- -- - - -- -- - - -- -- - -- -- --
o.oz
0.023
--�--r--�
--1--1--L--1-----L--L--L-----'--
--1--�--T--r--�
--1--,--r--T--+----1--�}}}}T--
--L--L�T•ar�"e
--1r--AA1-; T-- --
Ir 11-i,�c
0.022
0.021
---T--r
--1--1--L--1-----J--1--L--1---'--
T--T--r
T--r--r
--
--r--'---'-
T-DT-_T 1 TT T --
RainfaI[=;1.�01' _
0.02
TT,__�1_p_ T __ T __
0.019
--1--+--+--1---1--+--+--+--1---1--+-_
11---1---1----
11---1---1--
�1-
p
1Rum6ffAre
—444 Z.4
0.018
--1--?--
--
i 1-98_
0.017
-IV
'�;�p�O�VE�-
0.016
--1-- --
--1---1---1--
--
--1---1--
--
F'A1f-'��
w 0.015
0.014
--1--+--+--1---1--+--+--+--1---1--+--+--+-p--1--+--+--+-------+/�--+--
--'---' --
1 1
1---1---1---1--
1 1
1 1
1---
1
1---1---1---1--
1 1
1 1
11 --1
1
1 -Ri Lmgff DLTtr1�9.007 -
3 0.013
0 0.012
---+--+--1---1--
----------------------------------------------
--+--r--1---1--+--+--+--1---1--+--+-�-.ram--1---1--.+�,--y+�--
T���-1111f11
LL
0.011
i
--1--Y--Y--r--1--Y--+--r--r--1--Y--+--r--1---1--Y--+--r--1---1--+--Y--
0.01
--'---'----------------------'--
" 1------'--
{�-'-----'---
7p-
0.009
--1--Y--r--r--1--
Y--r--1---1--
--r--r--1---1--Y--Y--r--1-
VNY
0.008--
0.007
T
r
T
T
r
--T--r--r
T--T--T--1---1--T--r--
0.006
--1--1--L--1-----J--1--L--1---'--
1
I
I
--
--r-------1--1--L--1-----1--L--
1 1 1 I 1
0.005
--1Trr--1TT--r--�
--1Trr1-1TTT1-1T--r--
0.004
----T--r-----'--
--T--r-----'--
--
--r-----'--
--T---------T--r--
0.003
----T--
r
T--
T--
r
T--
T--
r 7--T--T------- T--r--
0.002
---T--r-----'--
--T--r-----'--
--
--r-----'--
--T---------T--r--
0.001
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)

4598 - ALEXANDER FARMS STORMWATER CONTRO Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment 45S: DA-4 Stream Buffer (Post Map 2.0)
Runoff = 0.17 cfs @ 3.39 hrs, Volume= 0.016 af, Depth= 0.06"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 1-inch Rainfall=1.00"
Area (sf) CN Description
144,081 78 Weighted CN
144,081 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
11.2 Direct Entry, TC
Subcatchment 45S: DA-4 Stream Buffer (Post Map 2.0)
Hydrograph
- -'- - -' - - 1 - - 1 - - 1 - -'- - -'- - 1 - - 1 - - 1 - - 1 - -'- - -'- - 1 - - 1 - - L - -'- - -'- - -' - - 1 - -I - - L - -'- - -
0 -'-- '-- ' --'--'---'---'-- ' --'--'---'---'-- '-- '--'---'---'---'---'--'---'---'--- ■Runoff
0.17 cfs -'----1--L--1-----J--1--1--L--1---'---�-+1�h--L-------(-�1--1--1--L--1---
0.17
0.16---'---'---'--'---'----------------------------'---_ __
0.15 ---'-- -- ----------'-- --1-------'-- -- -- I_RaInfaff-;1.U070.14
--
0.13 --'-- -- --I --'I ------- �, -- �, --'I --'I--',Ryrnoff Are0=',144,8$1-Of -
---------------------------------------------------------------
0.12 ---'-- -------------'--'--'---'----- �r`fff'VY��'rq"1�---0-Cif -
0.11'---'---'---'--'---------------------''' -'---I I II I I I
-- - - -- -R
w u nab 6@t)th=�O.U6in- -
0 0.09---------I--------------------------I-----'��-1�F.� Illrll--
LL 0.08 ww''
0.07 ---i-- li-- li--i --i-----i-- li-- li --i --i --i-- li-- li--i --i-----i-- li-4Y=7V--
0.06
0.05 ---�
----------------------
0.04
0.03
0.02 _
0.01
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)

4598 - ALEXANDER FARMS STORMWATER CONTRO Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 8
Summary for Pond 36P: SAND FILTER/DETENTION
Inflow Area = 12.217 ac, 0.00% Impervious, Inflow Depth = 0.56" for 1-inch event
Inflow = 15.84 cfs @ 3.16 hrs, Volume= 0.574 of
Outflow = 0.25 cfs @ 6.05 hrs, Volume= 0.573 af, Atten= 98%, Lag= 174.0 min
Primary = 0.25 cfs @ 6.05 hrs, Volume= 0.573 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 761.85' @ 6.05 hrs Surf.Area= 13,679 sf Storage= 22,372 cf
Plug -Flow detention time= 1,101.1 min calculated for 0.573 of (100% of inflow)
Center -of -Mass det. time= 1,103.3 min ( 1,315.4 - 212.1 )
Volume Invert Avail.Storage Storage Description
#1 760.00' 79,733 cf Custom Stage Data (Irregular)Listed below (Recalc)
Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area
(feet) (sq-ft) (feet) (cubic -feet) (cubic -feet)
760.00 10,534 547.0 0 0 10,534
761.00 12,209 569.0 11,361 11,361 12,566
762.00 13,945 588.0 13,067 24,429 14,408
763.00 15,739 607.0 14,833 39,262 16,311
764.00 17,589 626.0 16,655 55,917 18,275
765.00 19,496 644.0 18,534 74,451 20,202
765.25 22,799 676.0 5,281 79,733 23,567
Device Routing Invert Outlet Devices
#1 Primary 756.00' 30.0" Round 30" RCP L= 116.8' Ke= 0.200
Inlet / Outlet Invert= 756.00' / 755.25' S= 0.0064 T Cc= 0.900
n= 0.013 Concrete, trowel finish, Flow Area= 4.91 sf
#2 Device 1 760.00' Sand Filter 1 & 2
Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00
Disch. (cfs) 0.000 0.200 0.257 0.314 0.371 0.428 0.428
#3 Device 1 762.00' 3.0" Vert. CPV control C= 0.600 Limited to weir flow at low heads
#4 Device 1 763.00' Custom Weir/Orifice FLOOD STORM, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 1.75
Width (feet) 9.00 9.00 16.00 16.00
Primary OutFlow Max=0.25 cfs @ 6.05 hrs HW=761.85' (Free Discharge)
L1=30" RCP (Passes 0.25 cfs of 52.82 cfs potential flow)
12=Sand Filter 1 & 2 (Custom Controls 0.25 cfs)
3=CPV control ( Controls 0.00 cfs)
4=Custom Weir/Orifice FLOOD STORM ( Controls 0.00 cfs)

4598 - ALEXANDER FARMS STORMWATER CONTRO Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 9
Pond 36P: SAND FILTER/DETENTION
Hydrograph
XF-
1 15.84 cfs ---------------------------------------------- ---------
16 ��� r
14
---r--r--r--r--i--r--r--r--i--r--t--r--r—r--r--i-- i-27311
r r— i--
13 } r ^/' ^Tr
---r--r--r--r----r--r--r----r--t--r--r #DKagee i2 —�LF-
12
11
w10 I I I I I
u — —J--L--L--'---'--1--L--1---1--J--1--L--1-----1--L--1-----L--L--L--'--
0 8
u— — — — — — — — — — — — — —
6--------r---------i --i-----i-- --i-----i-- --i---------r --i --i--
5—
---li----il-----li----il —
--il----li-- --il-----li-- --il-----li----ail --il --li--
--r--r--r--r--i--r--r--r--i--r--T--r--r--i--r--r--r--i--r--r--r--i--
4
--r--r--r--r----r--r--r----r--r--r--r----r--r--r----r--r--r--i--
3
0.25 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)
■ Inflow
■ Primary

4598 - ALEXANDER FARMS STORMWATER CONTRO Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 10
Summary for Pond 41 P: WET POND
Inflow Area = 35.478 ac, 0.00% Impervious, Inflow Depth = 0.45" for 1-inch event
Inflow
= 36.95 cfs @
3.16 hrs, Volume= 1.332 of
Outflow
= 0.21 cfs @
6.12 hrs, Volume= 1.258 af, Atten= 99%, Lag= 177.4 min
Primary
= 0.21 cfs @
6.12 hrs, Volume= 1.258 of
Routing by
Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Starting Elev=
748.50' Surf.Area= 31,630 sf Storage= 209,326 cf
Peak Elev=
750.08' @ 6.12 hrs
Surf.Area=
37,809 sf Storage= 265,217 cf
(55,890 cf above start)
Plug -Flow detention time= (not calculated: initial storage exceeds outflow)
Center -of -Mass det. time= 2,738.1 min
( 2,954.4 - 216.3 )
Volume
Invert Avail.Storage
Storage Description
#1
738.00' 479,780
cf
POND STORAGE (Irregular)Listed
below (Recalc)
499,894 cf Overall - 20,114 cf Embedded = 479,780 cf
#2
738.00' 8,046
cf
RIP -RAP DISPLACEMENT (Prismatic)Listed below (Recalc) Inside #1
20,114 cf Overall x 40.0% Voids
487,826
cf
Total Available Storage
Elevation
Surf.Area
Perim.
Inc.Store Cum.Store
Wet.Area
(feet)
(sq-ft)
(feet)
(cubic -feet) (cubic -feet)
738.00
13,948
603.0
0 0
13,948
739.00
15,175
623.0
14,557 14,557
15,993
740.00
16,443
644.0
15,805 30,362
18,203
741.00
17,752
664.0
17,093 47,455
20,385
742.00
19,100
681.0
18,422 65,877
22,325
743.00
20,476
694.0
19,784 85,661
23,905
744.00
21,879
708.0
21,174 106,835
25,617
745.00
23,309
721.0
22,590 129,425
27,259
746.00
24,765
734.0
24,033 153,458
28,931
747.00
26,247
747.0
25,502 178,961
30,633
748.00
27,753
759.0
26,996 205,957
32,256
748.50
31,630
791.0
14,835 220,792
36,222
749.00
35,679
823.0
16,817 237,610
40,352
750.00
37,655
854.0
36,663 274,272
44,573
751.00
39,603
879.0
38,625 312,897
48,128
752.00
41,610
903.0
40,602 353,499
51,646
753.00
43,677
928.0
42,639 396,139
55,402
754.00
45,806
952.0
44,737 440,876
59,113
755.00
47,996
977.0
46,897 487,773
63,070
755.25
48,976
983.0
12,121 499,894
64,038
Elevation
Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
738.00
1,820
0 0
748.50
1,820
19,110 19,110
748.51
1,000
14 19,124
749.50
1,000
990 20,114

4598 - ALEXANDER FARMS STORMWATER CONTRO Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 11
Device
Routing
Invert
Outlet Devices
#1
Primary
747.30'
42.0" Round 42" RCP OUTFALL
L= 52.9' RCP, mitered to conform to fill, Ke= 0.700
Inlet / Outlet Invert= 747.30' / 747.00' S= 0.0057 T Cc= 0.900
n= 0.013 Concrete pipe, bends & connections, Flow Area= 9.62 sf
#2
Device 1
748.50'
2.5" Horiz. INVERTED WATER QUALITY ORIFICE C= 0.600
Limited to weir flow at low heads
#3
Device 1
750.25'
4.3" Vert. 4.25" ORIFICE C= 0.600
Limited to weir flow at low heads
#4
Device 1
751.75'
4' WIDE X 1.25' TALL WEIR X 2.00, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.25
Width (feet) 4.00 4.00
#5
Device 1
754.00'
EMERGENCY WEIR X 4.00, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00
Width (feet) 5.00 5.00
Primary OutFlow Max=0.21 cfs @ 6.12 hrs HW=750.08' (Free Discharge)
L1=42" RCP OUTFALL (Passes 0.21 cfs of 34.05 cfs potential flow)
2=INVERTED WATER QUALITY ORIFICE (Orifice Controls 0.21 cfs @ 6.05 fps)
3=4.25" ORIFICE ( Controls 0.00 cfs)
4=4' WIDE X 1.25' TALL WEIR ( Controls 0.00 cfs)
5=EMERGENCY WEIR ( Controls 0.00 cfs)
Pond 41 P: WET POND
Hydrograph
36.95
cfs
;--�--r--I---I--,--r--I---I--,--rt--'r--I---I--7--r--I---I--�-w-r--'r--I--
I�rezr
38
------
--
-------
--
-- -----
-Irtflow- 35 78-aY-
36
34
---
---+--+--+-------+--+-------+--+--+----PEa+E[ev—+/-,%.0C��
-- --
-------
--
------- --
-----------C------ r�-�/--/�-�---
-
32
30
-
-------,--,
-----
- r-- Ir--li--
--------,--,
--r--Ir--li--
--rt--Ir----}-1i�-�,7I'--rQ-li-
--------,---,
--�y rA� -li--
--, -- k�ll�t a=2-6�/I��rFfl Ci -
28
-
- -
-
- - -
- -
26
-'--------'---'-----L--L--1--J--1--L--1--J--1--L--1-----------'--
N 24
---+--+--+-------+--+-------+--+--+-------+--+-------+--+--+----
22
---r--r--r--r--i--r--r--r--i--r--r--r--r--i--r--r--r--i--r--r--r--i--
3 20
-
- -
-
- - -
- - - - - - -
M 18
-
- -
-
- - -
- - - - - - -
16
-1--J--1--L--1---'--1--L--1---1--J--1--L--1-----1--L--1-----1--L--
--'--
14
---+--+--+-------+--+-------+--+--+-------+--+-------+--+--+----
12
--
----r--Ir--li--
--r--Ir--li--
--rt--Ir--Ir--li--7--r--Ir--li--
--r--Ir--li--
10
6
�--J--1--L--1---'--1--L--1---1--J--1--L--1---'--1--L--1---'--1--L--�--'--
0.21 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)
■ Inflow
■ Primary

4598 - ALEXANDER FARMS STORMWATER CONTRO Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 12
Summary for Link 42L: COMBINED POST DEVELOPED FLOW
Inflow Area = 60.529 ac, 0.00% Impervious, Inflow Depth > 0.37" for 1-inch event
Inflow = 0.56 cfs @ 3.41 hrs, Volume= 1.851 of
Primary = 0.56 cfs @ 3.41 hrs, Volume= 1.851 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 42L: COMBINED POST DEVELOPED FLOW
Hydrograph
L - -I - -'- - L - -I - - L - -'- - - -I - -L - L - -I - - L - -'- - - -I - -L - -'- - L - - L - -'- - L - -
I� I � � 1 ❑Inflow
0.56 cfS--+----L--L--L------+-- L--L--L-- +--L----L--'- -- ❑ Primary
Inflow Aee&60.5�29'' a
0.55
---+--'--
--+-- --'--
--+-- -
--
-- --'--
--+--
---- -- --'-- --
0.5
--+--'--
--+-- --'--
--+-- -
--+--
--'--
--+--
--'-- -- --'-- --
0.45
-'--
--+-- --'--
--+-- -
--+--
--'--
--+--
--'-- -- --'-- --
0.4
-'--
J--1--L--1--
--+--L-J--1--L--'--
--1--L--1--L--L----L--
0.35
-'-- --
+-- --'--
--+-- -
--+--
--'--
--+--
--'-- -- --'-- --
0 0.3
-'-- --+--
--'--
--+-- -
--+--
--'--
--+--
--'-- -- --'-- --
0.15
-'----+--'--
--+-- --'--
--
--'-- -- --'-- --
0.1
+--+--+----+--+--+-+--+--+--+-+--+--+---
--
0.05
0r1T0
5 10 15 20 25
30
35 40 45
50
55 60 65
76
75 86
85
90
95
100 105 110 115 120
Time (hours)

1 YEAR - 24 HR STORM

30S
DA-1 (PRE MAP-1.0)
49L
4HS COMBINED PRE
DEVELOPED
DA-2 (PRE MAP-1.0)
34S N 36P
DA-1 (POST MAP 2.0) SAND
FILTER/DETENTION
40S N 41 P
DA-2 (POST MAP-2.0) WET POND 42L
47S COMBINED POST
DEVELOPED FLOW
DA-3 Bypass (POST
MAP-2.0)
45S
DA-4 Stream Buffer
(Post Map 2.0)
Subcat Reach on Link Routing Diagram for 4598 - ALEXANDER FARMS STORMWATER CONTROL
Prepared by COLEJENEST & STONE, Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment 30S: DA-1 (PRE MAP-1.0)
Runoff = 16.63 cfs @ 12.30 hrs, Volume= 1.946 af, Depth= 0.46"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Area (sf) CN Description
2,221,641 69 Weighted CN
2,221,641 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
25.1 Direct Entry, TC
Subcatchment 30S: DA-1 (PRE MAP-1.0)
Hydrograph
■Runoff
18 16.63 cfs I + +
17 ---- -----L--L----1---1---1--J--1--L--+--LCha'rCq fgL21I —1--Lr -
16 ---- -----L--L-- --1---1---1--J--1--L--+--L--
,i - ;
15 _ - _ _ vvv�...J... 1 �y�124-hr- a�,n# 58.. -
14 --I------------------------I- -I _I I I I I
13 _iRunff d'Ar'ew=2221- 41-a _
12 ---- ---;-- --r-- --------- ----4-RurtoffiVo[Urhe"1-.9460 -
11 ----
10 - -- -- -- - ---- -- -- -- - Runoff De��th=0.r46,.. L
--r-- ----T--r-
9 --I-- -I-- -- -- -- --------I-- -- ----+--r--'------Tjc=5�1-t-
'� 8-
7- - -- -- -- -- -- --+-- -- -- -- -- --+-- --�- N=6 --
6 ---------------------L--L--------��---------------��--
5 --��-- L--L--L--L--L--L-------J--1--1--L--L--�L-------L--L--L--L--�L--
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)

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 18
Summary for Subcatchment 48S: DA-2 (PRE MAP-1.0)
Runoff = 2.50 cfs @ 12.52 hrs, Volume= 0.392 af, Depth= 0.49"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Area (sf) CN Description
414,981 70 Weighted CN
414,981 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
40.8 Direct Entry, TC
Subcatchment 48S: DA-2 (PRE MAP-1.0)
Hydrograph
� � � � � � � � � � � � � � � � � � � � � � � ❑Runoff
2.50 cfs
Charlotte 24-fir 1 -y'�,r
1 yr/24+hr R'ainfallT2.a8"
2 Ria n';off Are';& 414,98'1 d
KL;npff',VQlL;me=',0.$92 elf
Ru��noff'bepthT0.46'
Tc=40.8 to i h
- -I-- --T- ---I-- T--T- -T----------T--T--T-CN=7b
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)

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 34
Summary for Link 49L: COMBINED PRE DEVELOPED
Inflow Area = 60.529 ac, 0.00% Impervious, Inflow Depth = 0.46" for 1-yr/24-hr event
Inflow = 18.42 cfs @ 12.31 hrs, Volume= 2.338 of
Primary = 18.42 cfs @ 12.31 hrs, Volume= 2.338 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 49L: COMBINED PRE DEVELOPED
Hydrograph
--I--Y--Y--r--r--I--�--Y--r--I--Y--t--r--r--I--t--r--I---I--Y--r--r--I--
❑ Inflow
20
-r--I---I--�--r--�
I
--I--�--T--�--I---I--T--r--I---I--�--r--�--I--
'-
❑Primary
19
18.42
cfs
--I
------'--
--I-----I--
--
-- -
-----'-- --
-- --I-- ---
- ---'-- - --'-- ---I--
-Irtflow Ares
18
--I
+--+-------+--+-------+--+--+--+-+--+--+----+--+--+--+--I--
T.5291-ap-
17
--
rt--r--Ir--li--
--r--Ir--li--y--+--Ir--Ir--li--+--r--li---li--rt--r--Ir--li--
16
'
-- I
�--r--I---I--�--r--T--I--�--T--T--I---I--T--r--I---I--�--r--+--I--
15---I--
14
13
_I
1--L--1-----1--
-----I-- --+--
-------+---------1--L-- --I--
w 12
w
--
rt--r--Ir--li--
--r--Ir--li--y--+--Ir--Ir--li--+--r--li---li--rt--r--Ir--li--
U 11
T--T--I---I--T--T--I
--IT--TT--I---I--T--T--I---I--T--T--T--I--
3 10
- -II-
- -
-------Ii--I
- - -
-II------II- -II------II- -II- -II--
- - - - - -
,li----II-
--I--III--II-
8
-II
1--L--1-----1--L--1---1--J--1--L--1-----+--
-------1--L-- --I--
7
--
+--+--I---I--+--+--I---I--+--+--+--I---I--+--+--I---I--+--+--+--I--
6--I--
i
5
-
- -
- - -
- - - - - -
4
-I--
3
- -I
-----I--
--L--1---1--J--1--L--1---1--1--L--1---1--1--L--L--I--
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)

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 34S: DA-1 (POST MAP 2.0)
Runoff = 25.02 cfs @ 12.00 hrs, Volume= 1.403 af, Depth= 1.38"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Area (sf) CN Description
532,153 87 Drainage Area 1
532,153 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, TC
Subcatchment 34S: DA-1 (POST MAP 2.0)
Hydrograph
28
-- --, --, -- ■Runoff
--�i---�---�---�---'i-- it-- �i--�i--�i---�---�---�---�-- �i--it--i-
26 25.02 cfs
-- ---- -- -- - 1-- --1-- -- + --Carlo�fe'24- -r- - r -
24 y
22 1-yr/24rhr R'ainfallT2.58''
--r- ----+--+--r--r--r--+----+--+--+--+--r--r--r----+--+--+--r--r--
20 --,-- -- , --, --, --,---------- , -- ' RUn',off_ Are';& 532.153_�f -
18 -'-- -------------------'----R"npffV-pI PM
a=1A0$-cf'
N 16
-- -----1--L----1---1---1--J--1--1--+--Rtmaff'Deptlwi-.38L
3 14 1 1 1
-- ---
10 N=87
6
--+- +--+--+--+--+--+--+-+--+--+--+--+--+--+--+-+--+--+--+--+--+--
4
--r- -i--r--r--r--r--r--i---i--r--r--r--+--r--r--r--i--r--r--r--r--r--
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)

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 9
Summary for Subcatchment 40S: DA-2 (POST MAP-2.0)
Runoff = 58.95 cfs @ 12.00 hrs, Volume= 3.301 af, Depth= 1.12"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Area (sf) CN Description
1,545,417 83 WET POND POST
1,545,417 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 40S: DA-2 (POST MAP-2.0)
Hydrograph
----- - - -'-- L -- L -- L -- L--------'-- L -- 1 --I -- L -- L --L--'---'----
65 ■Runoff
58.95 cfs -- - - - - -- -- -- - ^- ---- -
60 --'----L--L--L--1---1---1--J--1--L--L--LI C4i rlgttp-24-I r j-y`r--
I I I I I I I I I I I I I
55 --''-- --''-- - - -' -' --' --' - - - 1 yr/2 hr-Ftatn#aN-2,i58L -
50
-- -- ----------'-- -----Rttntiff'Ar'ea=1,545,41T af--
45
-- - - - - -- Runoff VokiMeT3.301-a�f -
40
-- ---+--+-- ----+--+--+--+Runoff-Dep11� 1-.;'C2[vr-
w I
-I-----+--+--+--+----------+--+--+--+--r--+-----I-- - +--+--r--r--
-L 30 c=5T0 rnip
25 N=8�--
--r- ---r--r--r--r--r-------r--r--r--t--r--r--r----t--r--t--r--r--
20
--I-- ---r--r--r--r--r--r----r--r--r--t--r--r-------r--r--t--r--r--
15 I I I I I I I I I I I I I I I I I
---- ---
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)

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 15
Summary for Subcatchment 47S: DA-3 Bypass (POST MAP-2.0)
Runoff = 2.60 cfs @ 12.48 hrs, Volume= 0.392 af, Depth= 0.49"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Area (sf) CN Description
414,982 70 Weighted CN
414,982 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
38.5 Direct Entry, TC
Subcatchment 47S: DA-3 Bypass (POST MAP-2.0)
Hydrograph
� � � � � � � � � � � � � � � � � � � � � � � ❑Runoff
2.60 cfs
Charlotte 24-fir 1 -y'�,r
1-y►r/24+hr R'ainfallT2.58"
2 - - -- --rt----------'----rt--t--rRUn'offiA',reta=4�1�4,-982-0-
KL;nOff VQlL;me=',0.$92 elf
Ru��noff'bepthT0.46'
LL Tc=38.5 to i h
-�--1--1--�---�---�--J--1--1--L--L--1---1---1--1--L--�-�1�=7b-
1 I I I I I I I I I I I I I I I I I
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)

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 12
Summary for Subcatchment 45S: DA-4 Stream Buffer (Post Map 2.0)
Runoff = 3.51 cfs @ 12.10 hrs, Volume= 0.232 af, Depth= 0.84"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Area (sf) CN Description
144,081 78 Weighted CN
144,081 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
11.2 Direct Entry, TC
Subcatchment 45S: DA-4 Stream Buffer (Post Map 2.0)
Hydrograph
� � � � � � � � � � � � � � � � � � � � � � � ❑Runoff
3.51 cfs
Charlotte 24-fir 1-y'�Ir
-- - -- ;-- ; - - -- -- ; -- 1-Yrf247hr-Rainfall= 2:5$N-
3
RUn';off A,ire';&144,081 i9f
KL;nWVQIL;me='10.232 elf
1- - - - _ 1 - - 1 - - t _ _ I_ _ _ I _ _ _ I - - 1 - - 1 - - 1 - - Y - r - -1ZuY rt I
2
lRoff 1�7epthT0.8"-
Tc=11.'2 tnih
CAN=78
- -'I - -'I - - ; - - 7 - - T - -'I - -'I- - -'I - - 7 - - 7 - - T - - T - -'F - -'1- - -'I - - -'I - - T - - T - - 7 - -'I - -'I- - -'I - -
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 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)

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 21
Summary for Pond 36P: SAND FILTER/DETENTION
Inflow Area = 12.217 ac, 0.00% Impervious, Inflow Depth = 1.38" for 1-yr/24-hr event
Inflow = 25.02 cfs @ 12.00 hrs, Volume= 1.403 of
Outflow = 0.85 cfs @ 14.66 hrs, Volume= 1.401 af, Atten= 97%, Lag= 159.5 min
Primary = 0.85 cfs @ 14.66 hrs, Volume= 1.401 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 763.04' @ 14.66 hrs Surf.Area= 15,816 sf Storage= 39,932 cf
Plug -Flow detention time= 1,132.6 min calculated for 1.400 of (100% of inflow)
Center -of -Mass det. time= 1,133.6 min ( 1,960.2 - 826.7 )
Volume Invert Avail.Storage Storage Description
#1 760.00' 79,733 cf Custom Stage Data (Irregular)Listed below (Recalc)
Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area
(feet) (sq-ft) (feet) (cubic -feet) (cubic -feet)
760.00 10,534 547.0 0 0 10,534
761.00 12,209 569.0 11,361 11,361 12,566
762.00 13,945 588.0 13,067 24,429 14,408
763.00 15,739 607.0 14,833 39,262 16,311
764.00 17,589 626.0 16,655 55,917 18,275
765.00 19,496 644.0 18,534 74,451 20,202
765.25 22,799 676.0 5,281 79,733 23,567
Device Routing Invert Outlet Devices
#1 Primary 756.00' 30.0" Round 30" RCP L= 116.8' Ke= 0.200
Inlet / Outlet Invert= 756.00' / 755.25' S= 0.0064 T Cc= 0.900
n= 0.013 Concrete, trowel finish, Flow Area= 4.91 sf
#2 Device 1 760.00' Sand Filter 1 & 2
Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00
Disch. (cfs) 0.000 0.200 0.257 0.314 0.371 0.428 0.428
#3 Device 1 762.00' 3.0" Vert. CPV control C= 0.600 Limited to weir flow at low heads
#4 Device 1 763.00' Custom Weir/Orifice FLOOD STORM, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 1.75
Width (feet) 9.00 9.00 16.00 16.00
Primary OutFlow Max=0.80 cfs @ 14.66 hrs HW=763.04' (Free Discharge)
L1=30" RCP (Passes 0.80 cfs of 60.00 cfs potential flow)
12=Sand Filter 1 & 2 (Custom Controls 0.32 cfs)
3=CPV control (Orifice Controls 0.23 cfs @ 4.61 fps)
4=Custom Weir/Orifice FLOOD STORM (Weir Controls 0.26 cfs @ 0.68 fps)

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 22
Pond 36P: SAND FILTER/DETENTION
Hydrograph
28 25.02 cfs - - -- --=, -- - - --
26 IinfMo�N►rea= 2T�� 7 af.
24 --i-- ---r-----i-- --r--i --i----T--r-------T--r-----i----r--r--i--
-- ----- -- --------- -- --- --- -
Peak Elevc=763.04' -
--i-------- - - - -
20 -- --------- --+-- ---
8#orage=39,-M cI
1816
--i-- ---r-----i-- --r--i --i----T--r-------T--r-----i----r--r--i--
w
14
u
3
0
i
,
8-
6- ---- ---T-------T--T--T--i-- --T-- -------T--T-------T--T-
-F--li--
---- ----------------------------------------------------------
ii
il
il
0.85 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)
■ Inflow
■ Primary

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 23
Hydrograph for Pond 36P: SAND FILTER/DETENTION
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
760.00
0.00
1.00
0.00
0
760.00
0.00
2.00
0.00
0
760.00
0.00
3.00
0.00
0
760.00
0.00
4.00
0.00
0
760.00
0.00
5.00
0.00
0
760.00
0.00
6.00
0.00
0
760.00
0.00
7.00
0.00
0
760.00
0.00
8.00
0.00
1
760.00
0.00
9.00
0.09
137
760.01
0.00
10.00
0.22
625
760.06
0.01
11.00
0.63
1,923
760.18
0.04
12.00
25.02
19,337
761.63
0.24
13.00
1.66
37,153
762.86
0.51
14.00
1.00
39,735
763.03
0.76
15.00
0.79
39,907
763.04
0.84
16.00
0.61
39,638
763.02
0.71
17.00
0.55
39,384
763.01
0.59
18.00
0.47
39,215
763.00
0.53
19.00
0.41
38,910
762.98
0.53
20.00
0.36
38,393
762.94
0.52
21.00
0.34
37,742
762.90
0.52
22.00
0.32
37,077
762.86
0.51
23.00
0.31
36,395
762.82
0.50
24.00
0.29
35,704
762.77
0.49
25.00
0.00
34,058
762.66
0.47
26.00
0.00
32,418
762.55
0.44
27.00
0.00
30,869
762.45
0.42
28.00
0.00
29,417
762.35
0.39
29.00
0.00
28,073
762.26
0.36
30.00
0.00
26,855
762.17
0.32
31.00
0.00
25,780
762.10
0.28
32.00
0.00
24,808
762.03
0.26
33.00
0.00
23,882
761.96
0.25
34.00
0.00
22,972
761.89
0.25
35.00
0.00
22,075
761.83
0.25
36.00
0.00
21,191
761.76
0.24
37.00
0.00
20,321
761.70
0.24
38.00
0.00
19,464
761.64
0.24
39.00
0.00
18,620
761.57
0.23
40.00
0.00
17,790
761.51
0.23
41.00
0.00
16,972
761.45
0.23
42.00
0.00
16,167
761.38
0.22
43.00
0.00
15,374
761.32
0.22
44.00
0.00
14,595
761.26
0.21
45.00
0.00
13,828
761.20
0.21
46.00
0.00
13,073
761.14
0.21
47.00
0.00
12,331
761.08
0.20
48.00
0.00
11,600
761.02
0.20
49.00
0.00
10,889
760.96
0.19
50.00
0.00
10,217
760.91
0.18
51.00
0.00
9,584
760.85
0.17
52.00
0.00
8,988
760.80
0.16
CPv for entire site = 4.71 AC -FT
(205,078 CF)
1/2 CPv = 2.35 AC -FT (102,539 CF)
SAND FILTER + WET POND SORAGE @
36 HOURS SHALL BE GREATER THAN
OR EQUAL TO 102,539 CF
21,191 CUBIC FEET STORED IN SAND
FILTER AT 36 HOURS

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 24
Hydrograph for Pond 36P: SAND FILTER/DETENTION (continued)
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
53.00
0.00
8,428
760.76
0.15
54.00
0.00
7,900
760.71
0.14
55.00
0.00
7,404
760.67
0.13
56.00
0.00
6,937
760.63
0.13
57.00
0.00
6,499
760.59
0.12
58.00
0.00
6,088
760.55
0.11
59.00
0.00
5,701
760.52
0.10
60.00
0.00
5,338
760.49
0.10
61.00
0.00
4,997
760.46
0.09
62.00
0.00
4,678
760.43
0.09
63.00
0.00
4,378
760.40
0.08
64.00
0.00
4,097
760.38
0.08
65.00
0.00
3,834
760.35
0.07
66.00
0.00
3,587
760.33
0.07
67.00
0.00
3,355
760.31
0.06
68.00
0.00
3,139
760.29
0.06
69.00
0.00
2,936
760.27
0.05
70.00
0.00
2,745
760.26
0.05
71.00
0.00
2,567
760.24
0.05
72.00
0.00
2,401
760.22
0.04
73.00
0.00
2,245
760.21
0.04
74.00
0.00
2,099
760.20
0.04
75.00
0.00
1,962
760.18
0.04
76.00
0.00
1,834
760.17
0.03
77.00
0.00
1,714
760.16
0.03
78.00
0.00
1,602
760.15
0.03
79.00
0.00
1,498
760.14
0.03
80.00
0.00
1,400
760.13
0.03
81.00
0.00
1,308
760.12
0.02
82.00
0.00
1,223
760.12
0.02
83.00
0.00
1,142
760.11
0.02
84.00
0.00
1,068
760.10
0.02
85.00
0.00
998
760.09
0.02
86.00
0.00
932
760.09
0.02
87.00
0.00
871
760.08
0.02
88.00
0.00
814
760.08
0.02
89.00
0.00
760
760.07
0.01
90.00
0.00
710
760.07
0.01
91.00
0.00
664
760.06
0.01
92.00
0.00
620
760.06
0.01
93.00
0.00
579
760.05
0.01
94.00
0.00
541
760.05
0.01
95.00
0.00
506
760.05
0.01
96.00
0.00
472
760.04
0.01
97.00
0.00
441
760.04
0.01
98.00
0.00
412
760.04
0.01
99.00
0.00
385
760.04
0.01
100.00
0.00
360
760.03
0.01
101.00
0.00
336
760.03
0.01
102.00
0.00
314
760.03
0.01
103.00
0.00
293
760.03
0.01
104.00
0.00
274
760.03
0.01
105.00
0.00
256
760.02
0.00

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 25
Hydrograph for Pond 36P: SAND FILTER/DETENTION (continued)
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
106.00
0.00
239
760.02
0.00
107.00
0.00
223
760.02
0.00
108.00
0.00
209
760.02
0.00
109.00
0.00
195
760.02
0.00
110.00
0.00
182
760.02
0.00
111.00
0.00
170
760.02
0.00
112.00
0.00
159
760.02
0.00
113.00
0.00
149
760.01
0.00
114.00
0.00
139
760.01
0.00
115.00
0.00
130
760.01
0.00
116.00
0.00
121
760.01
0.00
117.00
0.00
113
760.01
0.00
118.00
0.00
106
760.01
0.00
119.00
0.00
99
760.01
0.00
120.00
0.00
92
760.01
0.00

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE
Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC
Page 26
Summary for Pond 41 P: WET POND
Inflow Area
= 35.478 ac,
0.00% Impervious, Inflow Depth = 1.12" for
1-yr/24-hr event
Inflow
= 58.95 cfs @
12.00 hrs, Volume= 3.301 of
Outflow
= 0.79 cfs @
23.77 hrs, Volume= 2.832 af, Atten= 99%, Lag= 705.8 min
Primary
= 0.79 cfs @
23.77 hrs, Volume= 2.832 of
Routing by
Stor-Ind method, Time
Span= 0.00-120.00 hrs, dt= 0.05 hrs
Starting Elev=
748.50' Surf.Area= 31,630 sf Storage= 209,326 cf
Peak Elev=
751.52' @ 23.77 hrs Surf.Area= 40,631 sf Storage= 321,504 cf
(112,177 cf above start)
Plug -Flow detention time= (not
calculated: initial storage exceeds outflow)
Center -of -Mass det. time= 2,000.2 min ( 2,842.0 - 841.8 )
Volume
Invert Avail.Storage Storage Description
#1
738.00' 479,780 cf POND STORAGE (Irregular)Listed below (Recalc)
499,894 cf Overall - 20,114 cf Embedded = 479,780 cf
#2
738.00' 8,046 cf RIP -RAP DISPLACEMENT (Prismatic)Listed below (Recalc) Inside #1
20,114 cf Overall x 40.0% Voids
487,826 cf Total Available Storage
Elevation
Surf.Area
Perim. Inc.Store Cum.Store
Wet.Area
(feet)
(sq-ft)
(feet) (cubic -feet) (cubic -feet)
738.00
13,948
603.0 0 0
13,948
739.00
15,175
623.0 14,557 14,557
15,993
740.00
16,443
644.0 15,805 30,362
18,203
741.00
17,752
664.0 17,093 47,455
20,385
742.00
19,100
681.0 18,422 65,877
22,325
743.00
20,476
694.0 19,784 85,661
23,905
744.00
21,879
708.0 21,174 106,835
25,617
745.00
23,309
721.0 22,590 129,425
27,259
746.00
24,765
734.0 24,033 153,458
28,931
747.00
26,247
747.0 25,502 178,961
30,633
748.00
27,753
759.0 26,996 205,957
32,256
748.50
31,630
791.0 14,835 220,792
36,222
749.00
35,679
823.0 16,817 237,610
40,352
750.00
37,655
854.0 36,663 274,272
44,573
751.00
39,603
879.0 38,625 312,897
48,128
752.00
41,610
903.0 40,602 353,499
51,646
753.00
43,677
928.0 42,639 396,139
55,402
754.00
45,806
952.0 44,737 440,876
59,113
755.00
47,996
977.0 46,897 487,773
63,070
755.25
48,976
983.0 12,121 499,894
64,038
Elevation
Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
738.00
1,820
0 0
748.50
1,820
19,110 19,110
748.51
1,000
14 19,124
749.50
1,000
990 20,114

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 27
Device
Routing
Invert
Outlet Devices
#1
Primary
747.30'
42.0" Round 42" RCP OUTFALL
L= 52.9' RCP, mitered to conform to fill, Ke= 0.700
Inlet / Outlet Invert= 747.30' / 747.00' S= 0.0057 T Cc= 0.900
n= 0.013 Concrete pipe, bends & connections, Flow Area= 9.62 sf
#2
Device 1
748.50'
2.5" Horiz. INVERTED WATER QUALITY ORIFICE C= 0.600
Limited to weir flow at low heads
#3
Device 1
750.25'
4.3" Vert. 4.25" ORIFICE C= 0.600
Limited to weir flow at low heads
#4
Device 1
751.75'
4' WIDE X 1.25' TALL WEIR X 2.00, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.25
Width (feet) 4.00 4.00
#5
Device 1
754.00'
EMERGENCY WEIR X 4.00, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00
Width (feet) 5.00 5.00
Primary OutFlow Max=0.79 cfs @ 23.77 hrs HW=751.52' (Free Discharge)
L1=42" RCP OUTFALL (Passes 0.79 cfs of 61.18 cfs potential flow)
2=INVERTED WATER QUALITY ORIFICE (Orifice Controls 0.29 cfs @ 8.36 fps)
3=4.25" ORIFICE (Orifice Controls 0.51 cfs @ 5.02 fps)
4=4' WIDE X 1.25' TALL WEIR ( Controls 0.00 cfs)
5=EMERGENCY WEIR ( Controls 0.00 cfs)
Pond 41 P: WET POND
Hydrograph
65 58.95 cfs -------- --------- -- --------- --------- -- -- ----
--+
60 --i---+--+--+----+--+--+----+ + + --
Irrflo�v- °►r',ezt=�5-478 - a�
55 --i---r--r-------r--r--r----r--+--r--i-
Peakr ECev=751-52.-
50 ,��, --�,-- - �,--�,,--�,---�,-- �,--�,,--�,---�,--+--�,,--Stprlage=321,504 cf _
----------------------------------- --
40 --li-- - --'i-----li-- -- li - -'i---- - - -'i - -'i--- ----'i --'i-----'i-- - -'i --'i --'i--
N
35 --i-- -+--+--i---i--+--+--i---i--+--+--+--i---i--+--+--i---i--+--+--+--i--
3
25 - -I -
20 �i --i-- - -- --i --i-- -- --i--i---- + --i --i --i-- + -------i-- -- --i --i--
15
10 --i-- --------- --------- -- --- - - - - -- --------- - - - - --
----
5 A 0.79 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)
■ Inflow
❑ Primary

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCAD® 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 28
Hydrograph for Pond 41 P: WET POND
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
209,326
748.50
0.00
1.00
0.00
209,326
748.50
0.00
2.00
0.00
209,326
748.50
0.00
3.00
0.00
209,326
748.50
0.00
4.00
0.00
209,326
748.50
0.00
5.00
0.00
209,326
748.50
0.00
6.00
0.00
209,326
748.50
0.00
7.00
0.00
209,326
748.50
0.00
8.00
0.00
209,326
748.50
0.00
9.00
0.00
209,326
748.50
0.00
10.00
0.15
209,451
748.50
0.00
11.00
0.93
211,066
748.56
0.02
12.00
58.89
248,488
749.63
0.17
13.00
4.21
294,616
750.84
0.56
14.00
2.56
304,180
751.08
0.66
15.00
2.03
309,854
751.23
0.70
16.00
1.59
313,811
751.33
0.74
17.00
1.42
316,479
751.39
0.75
18.00
1.23
318,499
751.44
0.77
19.00
1.08
319,913
751.48
0.78
20.00
0.94
320,711
751.50
0.79
21.00
0.88
321,084
751.50
0.79
22.00
0.84
321,342
751.51
0.79
23.00
0.82
321,473
751.51
0.79
24.00
0.77
321,500
751.52
0.79
25.00
0.00
318,899
751.45
0.77
26.00
0.00
316,154
751.38
0.75
27.00
0.00
313,481
751.32
0.73
28.00
0.00
310,879
751.25
0.71
29.00
0.00
308,352
751.19
0.69
30.00
0.00
305,898
751.13
0.67
31.00
0.00
303,518
751.07
0.65
32.00
0.00
301,213
751.01
0.63
33.00
0.00
298,984
750.95
0.61
34.00
0.00
296,833
750.90
0.59
35.00
0.00
294,765
750.85
0.56
36.00
0.00
292,777
750.80
0.54
37.00
0.00
290,867
750.75
0.52
38.00
0.00
289,046
750.70
0.49
39.00
0.00
287,313
750.66
0.47
40.00
0.00
285,665
750.61
0.45
41.00
0.00
284,102
750.57
0.42
42.00
0.00
282,649
750.54
0.39
43.00
0.00
281,303
750.50
0.36
44.00
0.00
280,056
750.47
0.33
45.00
0.00
278,901
750.44
0.31
46.00
0.00
277,829
750.41
0.29
47.00
0.00
276,809
750.38
0.28
48.00
0.00
275,831
750.36
0.27
49.00
0.00
274,894
750.33
0.25
50.00
0.00
273,995
750.31
0.24
51.00
0.00
273,134
750.29
0.23
52.00
0.00
272,308
750.27
0.22
PROVIDED PERMANENT POOL
STORAGE = 209,326 CF = 4.81 AC -FT
PERMANENT POOL VOLUME
REQUIREMENT:
WQv = 1.37 AC -FT
OPTIMAL TREATMENT WQv/PPv = 0.3
PPv SHALL BE = 4.56 OR GREATER
STORAGE IN WET POND @ 36
HOURS: 292,777 CF - 209,326 CF =
83,451 CF
COMBINED STORED VOLUME @ 36
HOURS = SAND FILTER + WET
POND VOLUME
83,451 CF + 21,191 CF = 104,642

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 29
Hydrograph for Pond 41 P: WET POND (continued)
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
53.00
0.00
271,516
750.25
0.22
54.00
0.00
270,738
750.23
0.22
55.00
0.00
269,964
750.20
0.21
56.00
0.00
269,195
750.18
0.21
57.00
0.00
268,431
750.16
0.21
58.00
0.00
267,671
750.14
0.21
59.00
0.00
266,916
750.12
0.21
60.00
0.00
266,165
750.10
0.21
61.00
0.00
265,419
750.09
0.21
62.00
0.00
264,677
750.07
0.21
63.00
0.00
263,940
750.05
0.20
64.00
0.00
263,208
750.03
0.20
65.00
0.00
262,480
750.01
0.20
66.00
0.00
261,757
749.99
0.20
67.00
0.00
261,039
749.97
0.20
68.00
0.00
260,325
749.95
0.20
69.00
0.00
259,616
749.93
0.20
70.00
0.00
258,911
749.91
0.20
71.00
0.00
258,211
749.89
0.19
72.00
0.00
257,516
749.87
0.19
73.00
0.00
256,826
749.86
0.19
74.00
0.00
256,140
749.84
0.19
75.00
0.00
255,460
749.82
0.19
76.00
0.00
254,783
749.80
0.19
77.00
0.00
254,112
749.78
0.19
78.00
0.00
253,445
749.77
0.18
79.00
0.00
252,783
749.75
0.18
80.00
0.00
252,125
749.73
0.18
81.00
0.00
251,472
749.71
0.18
82.00
0.00
250,824
749.70
0.18
83.00
0.00
250,181
749.68
0.18
84.00
0.00
249,542
749.66
0.18
85.00
0.00
248,909
749.64
0.18
86.00
0.00
248,280
749.63
0.17
87.00
0.00
247,655
749.61
0.17
88.00
0.00
247,036
749.59
0.17
89.00
0.00
246,420
749.58
0.17
90.00
0.00
245,810
749.56
0.17
91.00
0.00
245,204
749.54
0.17
92.00
0.00
244,603
749.53
0.17
93.00
0.00
244,007
749.51
0.16
94.00
0.00
243,415
749.49
0.16
95.00
0.00
242,829
749.48
0.16
96.00
0.00
242,247
749.46
0.16
97.00
0.00
241,670
749.45
0.16
98.00
0.00
241,098
749.43
0.16
99.00
0.00
240,531
749.41
0.16
100.00
0.00
239,969
749.40
0.16
101.00
0.00
239,411
749.38
0.15
102.00
0.00
238,859
749.37
0.15
103.00
0.00
238,311
749.35
0.15
104.00
0.00
237,769
749.34
0.15
105.00
0.00
237,232
749.32
0.15

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 30
Hydrograph for Pond 41 P: WET POND (continued)
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
106.00
0.00
236,699
749.31
0.15
107.00
0.00
236,172
749.29
0.15
108.00
0.00
235,649
749.28
0.14
109.00
0.00
235,131
749.26
0.14
110.00
0.00
234,618
749.25
0.14
111.00
0.00
234,110
749.23
0.14
112.00
0.00
233,606
749.22
0.14
113.00
0.00
233,108
749.21
0.14
114.00
0.00
232,614
749.19
0.14
115.00
0.00
232,125
749.18
0.13
116.00
0.00
231,642
749.16
0.13
117.00
0.00
231,164
749.15
0.13
118.00
0.00
230,691
749.14
0.13
119.00
0.00
230,222
749.12
0.13
120.00
0.00
229,759
749.11
0.13

4598 - ALEXANDER FARMS STORMWATER CCharlotte 24-hr 1-yr 1-yr/24-hr Rainfall=2.58"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 31
Summary for Link 42L: COMBINED POST DEVELOPED FLOW
Inflow Area = 60.529 ac, 0.00% Impervious, Inflow Depth > 0.96" for 1-yr/24-hr event
Inflow = 4.63 cfs @ 12.14 hrs, Volume= 4.857 of
Primary = 4.63 cfs @ 12.14 hrs, Volume= 4.857 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 42L: COMBINED POST DEVELOPED FLOW
Hydrograph
---- --------- --+-- -t- -- -- -t- --+-- -t- -- -- -t- --+--
❑ Inflow
5 ❑ Primary
4.63 cfs I of l'�ow Are4=60 T 529 ��� ap
4
m 3
3
LL
2
-t- --t--r----r--t--r------t--r----r--t--r------t--
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)

10 YEAR - 6 HR STORM

30S
DA-1 (PRE MAP-1.0)
49L
4HS COMBINED PRE
DEVELOPED
DA-2 (PRE MAP-1.0)
34S N 36P
DA-1 (POST MAP 2.0) SAND
FILTER/DETENTION
40S N 41 P
DA-2 (POST MAP-2.0) WET POND 42L
47S COMBINED POST
DEVELOPED FLOW
DA-3 Bypass (POST
MAP-2.0)
45S
DA-4 Stream Buffer
(Post Map 2.0)
Subcat Reach on Link Routing Diagram for 4598 - ALEXANDER FARMS STORMWATER CONTROL
Prepared by COLEJENEST & STONE, Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 10-yr Rainfall=3.72"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 30S: DA-1 (PRE MAP-1.0)
Runoff = 61.98 cfs @ 3.46 hrs, Volume= 4.626 af, Depth= 1.09"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 10-yr Rainfall=3.72"
Area (sf) CN Description
2,221,641 69 Weighted CN
2,221,641 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
25.1 Direct Entry, TC
Subcatchment 30S: DA-1 (PRE MAP-1.0)
Hydrograph
� �---'--�--L--L--L--1---1---1--J--1--L--L--L--L--'---'--L--�--L--L--L-- ■Runoff
61.98 cfs
-----+--+--+----+--+--+--i C a'Irfgttp 6ihr'r y- r -
60
r-------T--T--r--r--r--r----T--T--T--T--r--r--r ---- -----
55 kainfall=3.727
----------------------------------
-----------------
50------------' --'-----------'---- Rundff_'Ar�ea=2221 641_sf -
45 Ruilof-Viol1.1llle-626Q1-
-
- ----------1--L----1---1---1--J--1- L
p iA A i/�
w 40------I----+--+--r--------I----+--+--+--rFFuiitJii'-n��7 �.+091n -
3 35
r-------r--r--r--r----------r--r--r--t--r--r--r---�
1z 30 1- T
25 YN =6 N
----------------------------
20
-----'----1--L--L--1---1---1--J--1--L--1--L----1---1--J--L--1--L-- --
15
-----I--+--+--+--+------------+--+--+--+--+-------+----+--+--+--
10 1 1
-
----I-- r -- T -- r -- r--------I-- r -- r -- r -- T -- r --r-----I-- T-- -- T -- r -- r --
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 10-yr Rainfall=3.72"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 7
Summary for Subcatchment 48S: DA-2 (PRE MAP-1.0)
Runoff = 9.33 cfs @ 3.69 hrs, Volume= 0.910 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
Charlotte 6-hr 10-yr Rainfall=3.72"
Area (sf) CN Description
414,981 70 Weighted CN
414,981 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
40.8 Direct Entry, TC
Subcatchment 48S: DA-2 (PRE MAP-1.0)
Hydrograph
■ Runoff
9.33 cfs
--;--;- - - ----;--;- CD arlott66-'hr10=y;r-
9
--rt--r--r----rt--rt--t--r--r- -Rainfall:*.72P�-
7
PM
N 6
w I-Runof# Depths-+01511. -
LL 5 _ T¢=40.'�8 M i i�_
-- - - -- -- -- - -- ------ - -- - --
-
4 CAN=7b
3
---'---'--�--1--L--�--1---1---1--J--1--1--1--L--L--1---1--J--1--1--L--�--
--i--r--r--r--r--r--r--r--i--r--r--r--r--r--r--r--i--r--r--r--r--r--
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 10-yr Rainfall=3.72"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 13
Summary for Link 49L: COMBINED PRE DEVELOPED
Inflow Area = 60.529 ac, 0.00% Impervious, Inflow Depth = 1.10" for 10-yr event
Inflow = 68.68 cfs @ 3.48 hrs, Volume= 5.536 of
Primary = 68.68 cfs @ 3.48 hrs, Volume= 5.536 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 49L: COMBINED PRE DEVELOPED
Hydrograph
'---------------1------1I
❑ Inflow
I
---I -----I
----'I -----1I
-----I ----+I----1---1--+----1---1
-------------1 --
I
-10ow Area=601529111-ap-
10Primary
68
65
60
'
1---1---1--1---1---1---1--1---1---1---1--1---1---1---1---1--1---1---1---1----------
55
'
--
11--J---1
----r--1---1--
--+--i
--1-- --+--
--1---1--+--r--1---1-- --r-- --1--
1
50
'
L--1---1--L--L--1---1--J--1--L--1---1--1--L--1---1--L--L--L--1--
45
N
U
40
1
1 1
1 1
1 1
1 1
1 1
1
1 1 1 1 1 1 1 1 1 1 1
3
0 35
1---1---1
--
1---1---1---1
--
1---1---1---1--
1---1---1---1---1
-- 1---1---1---1 -- 1---1---1--
'
30
1--+--+--r--1---1--+--+--1---1--+--+--+--1---1--+--+--1---1--+--r--+--1--
25
'
1----1---1--1---1---1---1--1---1---1---1--1---1---1---1---1--1---1---1---1----------
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 10-yr Rainfall=3.72"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment 34S: DA-1 (POST MAP 2.0)
Runoff = 57.55 cfs @ 3.15 hrs, Volume= 2.424 af, Depth= 2.38"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 10-yr Rainfall=3.72"
Area (sf) CN Description
532,153 87 Drainage Area 1
532,153 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, TC
Subcatchment 34S: DA-1 (POST MAP 2.0)
Hydrograph
� � � � � � � � � � � � � � � � � � � � � �I �I ■Runoff
57.55 cfs
- - - - - - - - - - - - - 'C�arlo�te', -6-lh r,10=y-r -
55
-- -- - -- -- - - Rai- falfT .72'IF
50 -
------------------------------------------------------------------
45 RU n�off Are'a;532.153 d
-------------------------------------------------------------------
40 Ru n pff, VQ I L; mb=2.424 elf
35 Runoff IDu t-;2.38';..
- -- -- -- -- -- -- -- -- - -- -- -- -- --------------
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 10-yr Rainfall=3.72"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 40S: DA-2 (POST MAP-2.0)
Runoff = 145.45 cfs @ 3.15 hrs, Volume= 6.046 af, Depth= 2.05"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 10-yr Rainfall=3.72"
Area (sf) CN Description
1,545,417 83 WET POND POST
1,545,417 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 40S: DA-2 (POST MAP-2.0)
Hydrograph
� � � � � � � � � � � � � � � � � � � � � � � � ■Runoff
145.45 cfs --,----t--r--'r----1--;--1-r----------=--t--r--------I-- --rt--
----1--J--1--�--L--�--�--J--1--+--L--�---�---C-a1r1o`tfp1_6'�r-'� �1
—1r-
140 r "f y
130------+--+--+--+--+-+--+--+--+--+--+----+--+--+-kainfal]=3,,Z2�-
120-------'- --' --'--------'- - --'--Rti'rrdff Arlea=1F-545141 T Sf -
110 I I I I I I I I I 1
100 - Y--T--Y-- ,--+--Y-- Rlun'ofUVoiurhe#-6-046 cif -
w 90 - -- - -- �'RunQff Qep�h=2-�105!" -
----'-- t
p r--Y--r--r--r--i--r--r--Y--r--r--i---i--r--r--r--i = i
LL 70
6o N=8'
50
40
30
-- r -- Y -- T --
20It
LI1--L---------- --L-- ----------1--+--
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 10-yr Rainfall=3.72"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 47S: DA-3 Bypass (POST MAP-2.0)
Runoff = 9.67 cfs @ 3.66 hrs, Volume= 0.910 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
Charlotte 6-hr 10-yr Rainfall=3.72"
Area (sf) CN Description
414,982 70 Weighted CN
414,982 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
38.5 Direct Entry, TC
Subcatchment 47S: DA-3 Bypass (POST MAP-2.0)
Hydrograph
9.67 cfs -I-- I--;--7--r--F-----I---I--�--�--�--T--r--I�--I---I--�--�--T--r--I�--
■Runoff
9
--rt--r--r--'--rt--rt--t--r--'--- Rainfali-43.7211 -
-- -- -- - -- -- Rtn-offArt';w=4 4i9821.0 -
_7 n-Q-ffV+01 lm'=
--+-- -- --'+-- -- --+R- LI-- 1-- a=0.$10-4f -
Runoff b0t1hT1.�15" -
- - - - - - - - 7 - - 7 - - T - - T - -� - -�- - -�- - 7 - - 7 - - 7 - - T - - T - - - -�- - -�- - - 7 - - T - - T - - T
5 Td=38.5 M i n
4 CAN=7b
3
21
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 10-yr Rainfall=3.72"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 5
Summary for Subcatchment 45S: DA-4 Stream Buffer (Post Map 2.0)
Runoff = 9.10 cfs @ 3.24 hrs, Volume= 0.459 af, Depth= 1.67"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 10-yr Rainfall=3.72"
Area (sf) CN Description
144,081 78 Weighted CN
144,081 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
11.2 Direct Entry, TC
Subcatchment 45S: DA-4 Stream Buffer (Post Map 2.0)
Hydrograph
� � � � � � � � � � � � � � � � � � � � � � ■Runoff
--------1--L-- --------1--J--1--1--1--L--L-------J--1--1--L--'--
Char,lott6 6­hrAO-y'�,r
RainfallT3.72..
711 -- -- i --i -- ----r1�iun;off Area"-144;0S 1-s'f-
--r- F- -- -- I'R rrOffrVpI me=0 5$-#-
^ 6
- -- -- - - - -- -- -- --Runes# Depth:;1:67111
-
3 5
-------- -- -- --------------- -- -- ----------i���J
4 PN=78
3
2
--i---i--r--r--r--r--r--i---i--r--r--r--t--r--r--r--i--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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 10-yr Rainfall=3.72"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 8
Summary for Pond 36P: SAND FILTER/DETENTION
Inflow Area = 12.217 ac, 0.00% Impervious, Inflow Depth = 2.38" for 10-yr event
Inflow = 57.55 cfs @ 3.15 hrs, Volume= 2.424 of
Outflow = 23.85 cfs @ 3.33 hrs, Volume= 2.423 af, Atten= 59%, Lag= 10.5 min
Primary = 23.85 cfs @ 3.33 hrs, Volume= 2.423 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 763.85' @ 3.33 hrs Surf.Area= 17,309 sf Storage= 53,334 cf
Plug -Flow detention time= 523.4 min calculated for 2.422 of (100% of inflow)
Center -of -Mass det. time= 525.8 min ( 735.0 - 209.2 )
Volume Invert Avail.Storage Storage Description
#1 760.00' 79,733 cf Custom Stage Data (Irregular)Listed below (Recalc)
Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area
(feet) (sq-ft) (feet) (cubic -feet) (cubic -feet)
760.00 10,534 547.0 0 0 10,534
761.00 12,209 569.0 11,361 11,361 12,566
762.00 13,945 588.0 13,067 24,429 14,408
763.00 15,739 607.0 14,833 39,262 16,311
764.00 17,589 626.0 16,655 55,917 18,275
765.00 19,496 644.0 18,534 74,451 20,202
765.25 22,799 676.0 5,281 79,733 23,567
Device Routing Invert Outlet Devices
#1 Primary 756.00' 30.0" Round 30" RCP L= 116.8' Ke= 0.200
Inlet / Outlet Invert= 756.00' / 755.25' S= 0.0064 T Cc= 0.900
n= 0.013 Concrete, trowel finish, Flow Area= 4.91 sf
#2 Device 1 760.00' Sand Filter 1 & 2
Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00
Disch. (cfs) 0.000 0.200 0.257 0.314 0.371 0.428 0.428
#3 Device 1 762.00' 3.0" Vert. CPV control C= 0.600 Limited to weir flow at low heads
#4 Device 1 763.00' Custom Weir/Orifice FLOOD STORM, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 1.75
Width (feet) 9.00 9.00 16.00 16.00
Primary OutFlow Max=23.61 cfs @ 3.33 hrs HW=763.85' (Free Discharge)
L1=30" RCP (Passes 23.61 cfs of 64.40 cfs potential flow)
12=Sand Filter 1 & 2 (Custom Controls 0.36 cfs)
3=CPV control (Orifice Controls 0.31 cfs @ 6.32 fps)
4=Custom Weir/Orifice FLOOD STORM (Weir Controls 22.94 cfs @ 3.01 fps)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 10-yr Rainfall=3.72"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 9
Pond 36P: SAND FILTER/DETENTION
Hydrograph
-'----------'--'------------------------------------------'-- ■Inflow
57.55 CIS ■ Primary
I0oW area='�� T '� 7� af.
55 --- -- -------i-- -------i-- -- -------i-- -------i-- -- -- --i--
Peak Elev=763.85'
45---y--rt--r--Ir--li----r--Ir--li--y--+--Ir--Ir i�F�ge=537334,cf-
40 --- ----r--li---li----r--li --li-- --T--Ir--li---li--T--r-----li--T--r--
Ir--li--
35 - ----r--ri-- --r--i --i----T--T--r--T--r-----i----r-- T
--i--
ini----i-- li--i-- - - -i -- li--i --i-----i-- li --i-----i-- li--i--i---i-- li--i - -i --i--
23.85 cfs
----------------------------------------
--J--1--L--1---'-- --L--'---'--J--L--L-------1--L--1-----1--L--L--'--
10--J--1--L--1-----1--L--1---1--J--1--L--1-----1--L--1-----1--L-- ----
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 10-yr Rainfall=3.72"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 10
Summary for Pond 41 P: WET POND
Inflow Area = 35.478 ac, 0.00% Impervious, Inflow Depth = 2.05" for 10-yr event
Inflow
= 145.45 cfs @
3.15 hrs, Volume= 6.046 of
Outflow
= 26.12 cfs @
3.60 hrs, Volume= 5.706 af, Atten= 82%, Lag= 26.7 min
Primary
= 26.12 cfs @
3.60 hrs, Volume= 5.706 of
Routing by
Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Starting Elev=
748.50' Surf.Area= 31,630 sf Storage= 209,326 cf
Peak Elev=
752.72' @ 3.60 hrs
Surf.Area=
43,091 sf Storage= 371,868 cf
(162,542 cf above start)
Plug -Flow detention time= 4,743.9 min
calculated for 0.901 of (15% of inflow)
Center -of -Mass det. time= 1,096.1 min
( 1,308.6 - 212.5 )
Volume
Invert Avail.Storage
Storage Description
#1
738.00' 479,780
cf
POND STORAGE (Irregular)Listed
below (Recalc)
499,894 cf Overall - 20,114 cf Embedded = 479,780 cf
#2
738.00' 8,046
cf
RIP -RAP DISPLACEMENT (Prismatic)Listed below (Recalc) Inside #1
20,114 cf Overall x 40.0% Voids
487,826
cf
Total Available Storage
Elevation
Surf.Area
Perim.
Inc.Store Cum.Store
Wet.Area
(feet)
(sq-ft)
(feet)
(cubic -feet) (cubic -feet)
738.00
13,948
603.0
0 0
13,948
739.00
15,175
623.0
14,557 14,557
15,993
740.00
16,443
644.0
15,805 30,362
18,203
741.00
17,752
664.0
17,093 47,455
20,385
742.00
19,100
681.0
18,422 65,877
22,325
743.00
20,476
694.0
19,784 85,661
23,905
744.00
21,879
708.0
21,174 106,835
25,617
745.00
23,309
721.0
22,590 129,425
27,259
746.00
24,765
734.0
24,033 153,458
28,931
747.00
26,247
747.0
25,502 178,961
30,633
748.00
27,753
759.0
26,996 205,957
32,256
748.50
31,630
791.0
14,835 220,792
36,222
749.00
35,679
823.0
16,817 237,610
40,352
750.00
37,655
854.0
36,663 274,272
44,573
751.00
39,603
879.0
38,625 312,897
48,128
752.00
41,610
903.0
40,602 353,499
51,646
753.00
43,677
928.0
42,639 396,139
55,402
754.00
45,806
952.0
44,737 440,876
59,113
755.00
47,996
977.0
46,897 487,773
63,070
755.25
48,976
983.0
12,121 499,894
64,038
Elevation
Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
738.00
1,820
0 0
748.50
1,820
19,110 19,110
748.51
1,000
14 19,124
749.50
1,000
990 20,114

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 10-yr Rainfall=3.72"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 11
Device
Routing
Invert
Outlet Devices
#1
Primary
747.30'
42.0" Round 42" RCP OUTFALL
L= 52.9' RCP, mitered to conform to fill, Ke= 0.700
Inlet / Outlet Invert= 747.30' / 747.00' S= 0.0057 T Cc= 0.900
n= 0.013 Concrete pipe, bends & connections, Flow Area= 9.62 sf
#2
Device 1
748.50'
2.5" Horiz. INVERTED WATER QUALITY ORIFICE C= 0.600
Limited to weir flow at low heads
#3
Device 1
750.25'
4.3" Vert. 4.25" ORIFICE C= 0.600
Limited to weir flow at low heads
#4
Device 1
751.75'
4' WIDE X 1.25' TALL WEIR X 2.00, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.25
Width (feet) 4.00 4.00
#5
Device 1
754.00'
EMERGENCY WEIR X 4.00, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00
Width (feet) 5.00 5.00
Primary OutFlow Max=26.05 cfs @ 3.60 hrs HW=752.72' (Free Discharge)
L1=42" RCP OUTFALL (Passes 26.05 cfs of 78.29 cfs potential flow)
2=INVERTED WATER QUALITY ORIFICE (Orifice Controls 0.34 cfs @ 9.89 fps)
3=4.25" ORIFICE (Orifice Controls 0.73 cfs @ 7.29 fps)
4=4' WIDE X 1.25' TALL WEIR (Weir Controls 24.98 cfs @ 3.22 fps)
5=EMERGENCY WEIR ( Controls 0.00 cfs)
Pond 41 P: WET POND
Hydrograph
r--_ _ ■Inflow
lT--��--li--�--r--lili
1 145.45 Cfs -- 1 1 1 1 1 1 1 1 1 I I I 1 1 I I I I I I 1 ■ Primary
150 n low A{1 a 5. 8' a o
-�-J--1--L--1--L--L--1--- 1---i L--1---L----�-- --I-- -L- -- -- -- - --
130 1 1 T F 7 1 1 1 1 1 1 1 1I PI ~ T
120---r--r--r--1--r--r--r--1--r--r--1---1--r-1--r--r J �+ 1
1 �7 oragei =, 8V _Cil�
--- -- -- --1-- ----1---1--'----1---1--+- - 8, -1---
110
1 1 1 1 1 1 1 1 1 1 1 1
100
w90----1-- i --r --1-- i--r--i --1-- 7--r--1---1-- T --r--1---1-- i --r --1-- i--r--r __
u
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-1--+--+--r--1--+--+--1---1--+--r--1---1--+--r--1--+--+--r--1--+--+--1---
3 80
o '
-1--L--L--�--1--�--L--1---1--�--L--1--�--L--L--1--L--L--�--1--�--L--1---
M 70
60
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
50
--J--1--L--1--L--L--1---1--L--L--1---1--L--L--1--J--L--L--1--L--L--1---
26.12 cfs --11----11-- ----11-- ----11-- - ---11----11-- ---11---
- - - - T - - r - - - - - - T - - - -I - - 7 - - r - - - - -I - - T - - r - - - - - - T - - r - - - - 7 - - T - - - -
20
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 10-yr Rainfall=3.72"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 12
Summary for Link 42L: COMBINED POST DEVELOPED FLOW
Inflow Area = 60.529 ac, 0.00% Impervious, Inflow Depth > 1.88" for 10-yr event
Inflow = 54.29 cfs @ 3.46 hrs, Volume= 9.499 of
Primary = 54.29 cfs @ 3.46 hrs, Volume= 9.499 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 42L: COMBINED POST DEVELOPED FLOW
Hydrograph
------- � ❑
--�Inf
II--�---�-- �-- �- -
I --�--�---�-- � --�I--�---�-- � --�I--�---�-- �---T--�-- low
1 ------1---'--1--L--11--J--1--L--1-----1--L--1---'--1 +-t
- � [IPrimary54.29 cfs - - - - - - - rtflow-ArearK 529 -p -
50---li----i-----li----i
45-----?--,-----li----i
40------�, --�, ------ --�, ------ --�, --�, --�,-- --�,-----�,-- --�, --�,--
m 35--1--T--T--T-----1 T--T ---- ]--T--T--i-----T--T-----i-- T--it--i--
3 30 -- ----r---------r--r------T--r-------r--r------- r--r----
0
25 --r--r--r-------r--r--r----r--T--r-------r--r-------r--r--r--i--
20 --r--r--r--r----r--r--r----r--r--r--r----r--r--r----r--r--r--
i--
15 -+--+--r--r----+--+--r----+--+--r--r----+--r-------+--r--r--i--
10-+--+--r-------+--+-------+--+--+-------+--+-------+--r--+--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)

25 YEAR - 6 HR STORM

30S
DA-1 (PRE MAP-1.0)
49L
4HS COMBINED PRE
DEVELOPED
DA-2 (PRE MAP-1.0)
34S N 36P
DA-1 (POST MAP 2.0) SAND
FILTER/DETENTION
40S N 41 P
DA-2 (POST MAP-2.0) WET POND 42L
47S COMBINED POST
DEVELOPED FLOW
DA-3 Bypass (POST
MAP-2.0)
45S
DA-4 Stream Buffer
(Post Map 2.0)
Subcat Reach on Link Routing Diagram for 4598 - ALEXANDER FARMS STORMWATER CONTROL
Prepared by COLEJENEST & STONE, Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 25-yr Rainfall=4.38"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment 30S: DA-1 (PRE MAP-1.0)
Runoff = 87.73 cfs @ 3.45 hrs, Volume= 6.460 af, Depth= 1.52"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 25-yr Rainfall=4.38"
Area (sf) CN Descri
2,221,641 69 Weighted CN
2,221,641 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
25.1 Direct Entry, TC
Subcatchment 30S: DA-1 (PRE MAP-1.0)
Hydrograph
'
■Runoff
85---------T--T--T--T---------T--1--+--T-
80
- -----
--
--
--
----------
--
--
--+--T--'�----F a'r�f�fll ;'--
75
70
r-------t--t--r--r--r-------t--t--t--
--------T--
--T--T----------T--
--Runioff'Ar'ea�2,221,641-sf--
+-- r-- r-- r--I--t ----t--r--r--
65
60
r--li---li--T--T--T--T--T--li---li--T--T--T-
r-------r--r--r--r--r--r----r--r--r-
- -F+- -�, t
Rurto V�ohirheT�.46V
r--r--r--I-----r--r--r--r--r--
w 55
- - - - -
- - -,--T--r--r----------T--7--7--T--r
I�a�o#f De pith=11.521.. -
- �. r
50
0 45
-
------i--r--7--r--
--r--r--r--r
T
JC�S-r--r--r--r---
tAlJ -
40
---i---i--r--r--r--r--r--r--i--r--r--r--r--r--r--r--i--r--r-����-
35---------T--T--T--�
---------T--T--T--T--T---------T--T--r--T--
30
---I
7 -
- 7 -
- r -
- T - - - -
- - T -
- 7 -
I I I 1
- 7 - - T - - r - - - - �- - -� - T - - 7 - - T - - r - - - -
25
20
i
i 7--7--r--r--i--r
i- T--7--7--T--r--T--r--i-
T--7--T--r--T--
15
-- - -----
--
-----------------,--
--
------------------ -------,---
10
7 -
- T -
- r -
- T
T -
- 7 -
- 7 - - T - - r - - T T - - 7 - - T - - r - - T - -
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 25-yr Rainfall=4.38"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 8
Summary for Subcatchment 48S: DA-2 (PRE MAP-1.0)
Runoff = 13.09 cfs @ 3.67 hrs, Volume= 1.262 af, Depth= 1.59"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 25-yr Rainfall=4.38"
Area (sf) CN Description
414,981 70 Weighted CN
414,981 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
40.8 Direct Entry, TC
Subcatchment 48S: DA-2 (PRE MAP-1.0)
Hydrograph
� � � � � � � � � � � � � � � � � ❑Runoff
13.09 cfs--- -- -- -- -- -- -- -- -- -- -- - -- -- -- -- -
13 --D1arlotE 6��ir7�-y%' -
12 T F RWnfa11;4.38���
11
-- -- - - - - -- -- ftn'off Area; _t4-981- f -
10
--,--+--r-- -- R�nOffrVQl�me=1.6 �f
---'-- -- -- - -------'-- -- ----------------------------------
8 _Runaf#'Depth:;1_5911. -
LL 7 --- - -- -- - - - - -- -- -- - --, -----' d=4-O.'-in ihr-
6
$ i
4
3
--'---'--�--1--L--�--1---1---1--J--1--1--1--L--L--1---1--J--1--1--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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 25-yr Rainfall=4.38"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 14
Summary for Link 49L: COMBINED PRE DEVELOPED
Inflow Area = 60.529 ac, 0.00% Impervious, Inflow Depth = 1.53" for 25-yr event
Inflow = 97.46 cfs @ 3.47 hrs, Volume= 7.722 of
Primary = 97.46 cfs @ 3.47 hrs, Volume= 7.722 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 49L: COMBINED PRE DEVELOPED
Hydrograph
■ Inflow
97.46
cfs
-r--r--I--r--r--r--I--r--r--r--I--Y--r--I--r--r--r--I--r--r--r--
------------------- -
■ Primary
95
--+--+--+----+--+-------+--r-------+--+----+--+--+----+--+--+--
90
I -
- T - -
- -I - 7 -
- T - -
- - -I - + - - r - -
I - - 1 - - T - - Y - - - - I - - T - - - -
85
---'--'---'---'---'--'---'---'---'--'---'---'---------------------------'---
80
--
--
--
----
--
-------
--
-------+--
----
-- -- ---- -- -----
75
--r--r--r----r--r--r----r--r-------Y--r----r--r--r----r--r--r--
i
70
I
I
I
I I
I
I I
I I
I
I I I I
I I I I I I I I
i
^ 6560
--J--
--L--'--
--L--1---1--1--L--1-----1--L--1--J--1--L--1--
--L--'---
w
�- 55
0
50
---'--'---'---'---'--'---'---'---'--'----------------------------'--'
LL
45
--
--
--
----
--
-------
--
-------+--
----
-- -- ---- -- -----
40
--1--r--'r--'--I--r--'---'--I--r--'---'--7--r----I--r--'r----I--r--'---
35
-----
-------
--
-------
--
-------
---------
------- -- -----
30
--J--1--L--1--1--L--1---1--1--L--1---'--1--L--1--J--1--L--1--1--L--1---
25
--y--+--'r--'i--
--r--'r----rt--r--+----+--r----y--+--'r--'i--
--r--'r--
20
--I--,
--,
------,
---------,
-----I--
--, -----I--,
--,------, --,---
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 25-yr Rainfall=4.38"
Prepared by COLEJENEST & STONE Printed 7/30/2021
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Summary for Subcatchment 34S: DA-1 (POST MAP 2.0)
Runoff = 70.30 cfs @ 3.15 hrs, Volume= 3.041 af, Depth= 2.99"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 25-yr Rainfall=4.38"
Area (sf) CN Description
532,153 87 Drainage Area 1
532,153 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, TC
Subcatchment 34S: DA-1 (POST MAP 2.0)
Hydrograph
---- - -------?-------------------?--?------------------ ---------- ■Runoff
70.30 cfs ----- -- -- ------------ -- -- ----I�-+-------}- -c- -- -- -- --
70-------'----'--------------------------i�a�iQr',i����'�-y -
65
60
55-------'-- --!-r--r----------------rt R ------Unoff Are';a 5 2-t------
50--------- ---
------------- --- -- -- I�np1 ff VpI 1 lg=3:01-
145 IDI I I
RunoffcPthTZ99'`-
40
'---'---'--�--1--L--�--1---1---1--J--1--1--1--L--L--1---1--J--1--1--L--�--
35 Tc "5.'0 to i h
-- -- ------------ -- --T-- --------- -- -- -- -- --
30 1--L-- -- 1--1--1--L-- 1-qN=,87 -
25
7 - - 7 - - r - - 7 7 - - 7 - - 7 - - T - - 7 - - 7 - - 7 - - T - - T - - - -
20
�---�---�--�--1--L--�--1---1---1--J--1--1--1--L--L--1---1--J--1--1--L--�--
15
7 - - 7 - - r - - 7 7 - - 7 - - 7 - - T - - 7 - - 7 7 - - 7 - - T - - T - - 7 - -
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 25-yr Rainfall=4.38"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 5
Summary for Subcatchment 40S: DA-2 (POST MAP-2.0)
Runoff = 181.99 cfs @ 3.15 hrs, Volume= 7.744 af, Depth= 2.62"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 25-yr Rainfall=4.38"
Area (sf) CN Description
1,545,417 83 WET POND POST
1,545,417 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 40S: DA-2 (POST MAP-2.0)
Hydrograph
900
+ ■Runoff
181.99 cfs--J--1--1--L--L--1--J--1--1--L--1------'-- --+-- --------1--1--+--
-Oarlottq "r 2�- -
170-+----+--+--+--+--+-+--+--+--+--+--+----+--+--+----+--+-+--+--��-
160
150 ------ - -rt --t -- r- -r - - --
�rr---- ---- --------t--r--Rurfdff--�A--Mr-a-"r--5r-4--i-5-,-4i-1-7rt--s+f
140-------- r--r-- r---------- T-- --- ----
130 TT--T--+ T-- TiRu ofVokin�e=�7.744-af--
-
-
120
u 110----�-- -- -- ----------�-- -- ----------'RUndfF Qept,=2-6T
3 100----'---- --+ --+--------'---- --+------------+ --� --/+'-
+ 1 1 '1 \i=�' V � � -
° 90
80---1--J--1--+--L--+----J--1--1--L--1------'-- --+---------��8-
70---1--J--1--+--L------J--1--1--L---------- --+-- ----------1--1--
60--- I--+--+--+--+--+----+--+--+--+----------+--+--+--+-------+--+--
50 +--i--+--+--+--+--+--i--+--+--+--+--+--i---i--+--+--+--+--+--i--+--+--
40 r------- rt--
+--r--r----y-- --+--r--r-------y--+--r--r-------rt--+--
30 r--li----rt--r--r--Ir--li-- ----T--r--Ir--li---li-- --r--r--Ir--li---li--rt--T--
20 -------7--+--r--F------I--+--r-----------+--r----------F--+--
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 25-yr Rainfall=4.38"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 7
Summary for Subcatchment 47S: DA-3 Bypass (POST MAP-2.0)
Runoff = 13.56 cfs @ 3.64 hrs, Volume= 1.262 af, Depth= 1.59"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 25-yr Rainfall=4.38"
Area (sf) CN Description
414,982 70 Weighted CN
414,982 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
38.5 Direct Entry, TC
Subcatchment 47S: DA-3 Bypass (POST MAP-2.0)
Hydrograph
--�---�---�--�--1--L--�--1---1---1--J--1--1--1--L--L--1---1--J--1--1--L--�--
15 ■Runoff
13.56 cfs-----,-- --r--r----------------------r--r--r----r--,-----r--r-
---�,---�,---
13
12 RainfallT4.38"
11------i-- -- -- ----------i-- -- --
10
------,-- -------------------,-- --1 Mnpff tfpI4me=1."Z#-
9
+ - - I - - I- - - _ _ _ _ _ _ _ _ _ _ 4 - - _ _ � _ _ � _ _ � - - - - - - _ _ _ � _ _
w Runoff DepthT1.59�"
o 7-
6 -------- --1-- ----------1--J--1--1--1--L--
---- -- 70-
r4Nd
r--r--r--r--r--r--i--r--r--r--r-- r-- r--r--i --r r- =
4
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 25-yr Rainfall=4.38"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 45S: DA-4 Stream Buffer (Post Map 2.0)
Runoff = 11.83 cfs @ 3.24 hrs, Volume= 0.605 af, Depth= 2.19"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 25-yr Rainfall=4.38"
Area (sf) CN Description
144,081 78 Weighted CN
144,081 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
11.2 Direct Entry, TC
Subcatchment 45S: DA-4 Stream Buffer (Post Map 2.0)
Hydrograph
114
■ Runoff
11.83 cfs
- - - - - - - - C4arlotte, -6-h� 24-yjr -
10
9 ;------ --i-- i - ---- —, -- -- Rtrn,off Arta';a=144;081-4-
------;-- -- --; --;-------- -------Itun'ff i'-1 =0:00$O'T-
8
w Runoff DepthT2.�19�"
7
LL 6-;Td=11.2tnih
r--i---i--r--r--r--r--r--r--i--r--r--r--t--r--r--r--i--r--r--t--r--r--
5 N=7$
r--i--r--r--r--r--r--r--r--i--r--r--r--r--r--r--r--i--r--r----r--r--
4
r-
---r--r--r--r--r--r--r----r--r--r--r--r--r--r----r--r--r--r--r
--
3
-- -- --r ---------- -- -- -- --r --r ------- -- -- -- --r --
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 25-yr Rainfall=4.38"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 9
Summary for Pond 36P: SAND FILTER/DETENTION
Inflow Area = 12.217 ac, 0.00% Impervious, Inflow Depth = 2.99" for 25-yr event
Inflow = 70.30 cfs @ 3.15 hrs, Volume= 3.041 of
Outflow = 41.01 cfs @ 3.27 hrs, Volume= 3.041 af, Atten= 42%, Lag= 7.2 min
Primary = 41.01 cfs @ 3.27 hrs, Volume= 3.041 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 764.19' @ 3.27 hrs Surf.Area= 17,950 sf Storage= 59,355 cf
Plug -Flow detention time= 421.2 min calculated for 3.039 of (100% of inflow)
Center -of -Mass det. time= 423.6 min ( 631.6 - 208.0 )
Volume Invert Avail.Storage Storage Description
#1 760.00' 79,733 cf Custom Stage Data (Irregular)Listed below (Recalc)
Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area
(feet) (sq-ft) (feet) (cubic -feet) (cubic -feet)
760.00 10,534 547.0 0 0 10,534
761.00 12,209 569.0 11,361 11,361 12,566
762.00 13,945 588.0 13,067 24,429 14,408
763.00 15,739 607.0 14,833 39,262 16,311
764.00 17,589 626.0 16,655 55,917 18,275
765.00 19,496 644.0 18,534 74,451 20,202
765.25 22,799 676.0 5,281 79,733 23,567
Device Routing Invert Outlet Devices
#1 Primary 756.00' 30.0" Round 30" RCP L= 116.8' Ke= 0.200
Inlet / Outlet Invert= 756.00' / 755.25' S= 0.0064 T Cc= 0.900
n= 0.013 Concrete, trowel finish, Flow Area= 4.91 sf
#2 Device 1 760.00' Sand Filter 1 & 2
Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00
Disch. (cfs) 0.000 0.200 0.257 0.314 0.371 0.428 0.428
#3 Device 1 762.00' 3.0" Vert. CPV control C= 0.600 Limited to weir flow at low heads
#4 Device 1 763.00' Custom Weir/Orifice FLOOD STORM, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 1.75
Width (feet) 9.00 9.00 16.00 16.00
Primary OutFlow Max=39.74 cfs @ 3.27 hrs HW=764.17' (Free Discharge)
L1=30" RCP (Passes 39.74 cfs of 66.09 cfs potential flow)
12=Sand Filter 1 & 2 (Custom Controls 0.38 cfs)
3=CPV control (Orifice Controls 0.34 cfs @ 6.89 fps)
4=Custom Weir/Orifice FLOOD STORM (Weir Controls 39.02 cfs @ 3.32 fps)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 25-yr Rainfall=4.38"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 10
Pond 36P: SAND FILTER/DETENTION
Hydrograph
■ Inflow
70.30 cfS--rt--r-- --r-- ----t--'r--' 7--r-- rt--r--'r- -- ■ Primary
- 1--L-- --L-- J--+ p -
70 -- -� OyV-Q►re- �T� �q��y�i
65 ------ --,------- --,----------+--,---PreakFl Elev-- V4.11.%r-
55 ---- - - - -- S�#QI" gPr=59,356-C
50
41.01 cfs
�- 40
---=-- - - ------------------
3
M 35
30
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 25-yr Rainfall=4.38"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 11
Summary for Pond 41 P: WET POND
Inflow Area = 35.478 ac, 0.00% Impervious, Inflow Depth = 2.62" for 25-yr event
Inflow
= 181.99 cfs @
3.15 hrs, Volume= 7.744 of
Outflow
= 46.53 cfs @
3.44 hrs, Volume= 7.403 af, Atten= 74%, Lag= 17.5 min
Primary
= 46.53 cfs @
3.44 hrs, Volume= 7.403 of
Routing by
Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Starting Elev=
748.50' Surf.Area= 31,630 sf Storage= 209,326 cf
Peak Elev=
753.27' @ 3.44 hrs
Surf.Area=
44,248 sf Storage= 395,968 cf
(186,642 cf above start)
Plug -Flow detention time= 2,388.3 min
calculated for 2.597 of (34% of inflow)
Center -of -Mass det. time= 852.9 min ( 1,064.1 - 211.2 )
Volume
Invert Avail.Storage
Storage Description
#1
738.00' 479,780
cf
POND STORAGE (Irregular)Listed
below (Recalc)
499,894 cf Overall - 20,114 cf Embedded = 479,780 cf
#2
738.00' 8,046
cf
RIP -RAP DISPLACEMENT (Prismatic)Listed below (Recalc) Inside #1
20,114 cf Overall x 40.0% Voids
487,826
cf
Total Available Storage
Elevation
Surf.Area
Perim.
Inc.Store Cum.Store
Wet.Area
(feet)
(sq-ft)
(feet)
(cubic -feet) (cubic -feet)
738.00
13,948
603.0
0 0
13,948
739.00
15,175
623.0
14,557 14,557
15,993
740.00
16,443
644.0
15,805 30,362
18,203
741.00
17,752
664.0
17,093 47,455
20,385
742.00
19,100
681.0
18,422 65,877
22,325
743.00
20,476
694.0
19,784 85,661
23,905
744.00
21,879
708.0
21,174 106,835
25,617
745.00
23,309
721.0
22,590 129,425
27,259
746.00
24,765
734.0
24,033 153,458
28,931
747.00
26,247
747.0
25,502 178,961
30,633
748.00
27,753
759.0
26,996 205,957
32,256
748.50
31,630
791.0
14,835 220,792
36,222
749.00
35,679
823.0
16,817 237,610
40,352
750.00
37,655
854.0
36,663 274,272
44,573
751.00
39,603
879.0
38,625 312,897
48,128
752.00
41,610
903.0
40,602 353,499
51,646
753.00
43,677
928.0
42,639 396,139
55,402
754.00
45,806
952.0
44,737 440,876
59,113
755.00
47,996
977.0
46,897 487,773
63,070
755.25
48,976
983.0
12,121 499,894
64,038
Elevation
Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
738.00
1,820
0 0
748.50
1,820
19,110 19,110
748.51
1,000
14 19,124
749.50
1,000
990 20,114

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 25-yr Rainfall=4.38"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 12
Device
Routing
Invert
Outlet Devices
#1
Primary
747.30'
42.0" Round 42" RCP OUTFALL
L= 52.9' RCP, mitered to conform to fill, Ke= 0.700
Inlet / Outlet Invert= 747.30' / 747.00' S= 0.0057 T Cc= 0.900
n= 0.013 Concrete pipe, bends & connections, Flow Area= 9.62 sf
#2
Device 1
748.50'
2.5" Horiz. INVERTED WATER QUALITY ORIFICE C= 0.600
Limited to weir flow at low heads
#3
Device 1
750.25'
4.3" Vert. 4.25" ORIFICE C= 0.600
Limited to weir flow at low heads
#4
Device 1
751.75'
4' WIDE X 1.25' TALL WEIR X 2.00, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.25
Width (feet) 4.00 4.00
#5
Device 1
754.00'
EMERGENCY WEIR X 4.00, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00
Width (feet) 5.00 5.00
Primary OutFlow Max=46.58 cfs @ 3.44 hrs HW=753.27' (Free Discharge)
L1=42" RCP OUTFALL (Passes 46.58 cfs of 83.96 cfs potential flow)
2=INVERTED WATER QUALITY ORIFICE (Orifice Controls 0.36 cfs @ 10.52 fps)
3=4.25" ORIFICE (Orifice Controls 0.82 cfs @ 8.11 fps)
4=4' WIDE X 1.25' TALL WEIR (Orifice Controls 45.40 cfs @ 4.54 fps)
5=EMERGENCY WEIR ( Controls 0.00 cfs)
Pond 41 P: WET POND
Hydrograph
2 181.99
-+--L--I--�--L--1---1--1--L--1---I--1--L--1--J--1--L--1--�--+--I---
-- --+--II--
--
- -------------
------------ ----------+--II-- -- --I---
■Inflow
■ Primary
CfS
190
_I--T--T--T--II--
--T-------T--T----Inf
-IIVI`Y1r11]` F1e#`=3I:-A78ta0--
�F
180
170
---T--T--IT------T--II
----7--T-----I--T--T----T--T--T----T--T
" T
1CI'
160
150
,'
----------------------------------------------I--I
-1--J--1--L--1--1--L--1---1--1--L--1---
I I
I I
I
I I
I I
I
I--1 _�t}�
I I I ��������T7"I��I•--
140
---+--+--+----+--+-------+--+-------+--+----+--+--+----+--+--I---
130
---
--+--r--I--
--+-----I--
--T-------+--T--I--
--+--r--I----+--I---
120
T -- T -
- T -
T -
- T-
7--
T-
T -- T--I-- T -- T -- T--I-- T -- T - -I---
u 110
_
_ --T
i--r
T -T T
100
- -
--
--I--
=----I--
=----I-- --
--
LL 90
80
��
---J--+--L--I--
I
---+--+--+----+--+-------+--+-------+--+----+--+--+-+--+--+--I---
--L--1---1--1--L--1---1--1--L--1--J--1--L--I--
--+--I---
' .
46.53 cfs -
-- T--T
--I--
--T
--T----T
--T
-------T
--T --I----T--T --I----T--T--
40
30
--J--1--L--1--1--L--1---1--1--L--1-----1--L--1--J--1--L--1--1--L--1---
20
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 25-yr Rainfall=4.38"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 13
Summary for Link 42L: COMBINED POST DEVELOPED FLOW
Inflow Area = 60.529 ac, 0.00% Impervious, Inflow Depth > 2.44" for 25-yr event
Inflow = 95.20 cfs @ 3.33 hrs, Volume= 12.310 of
Primary = 95.20 cfs @ 3.33 hrs, Volume= 12.310 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 42L: COMBINED POST DEVELOPED FLOW
Hydrograph
---- --+--� --I---
-+--I---I- -+ --
-------+-- --I-- --+--� --I----+--I--
95.20 cfs--t--'r--I----r-------rt--r--I---I--7--r--I-- --t--'ram+--I--I-Q-r-I--
95 ----i--'L----1--L-------1--L----#to'I=Vfl'_5`'li"'Y-
90 -- -- -- --I-- -------I---1--I-------+--I--I-- -- ---------1--I--
85 r-1--r--r----r--r--r----r--r--I-----r--r----1--r--r----r--r--r-
80 ------------ --------- --------- ---------------- -- ----
75
70 --+--+--+----+--+-------+--+-------+--+----+--+--+----+--+--I--
65--1--r--r--I-----r--r----7--r--r-1--7--r----1--r--r------r--I-
w 60
1-1-1-11-----1-------------------------------------------
3 50 --+--+--+----+--+-------+--r-------+--+----+--+--+----+--+--I--
0
LL 45
i--r--r--r--i--r--r--r--i--r--r--r--i--r--r--i--r--r--r--i--r--r--r-
40 ------------ --------- --------- ---------------- -- ----
35 -J--1--L--1--1--L--1---1--1--L--1---'--1--L--1--J--1--L--1--1--L--1--
30 --+--+--+----+--+-------+--+-------+--+----+--+--+----+--+--I--
25--1--r--r----1--r-------1--r-------1--r----1--r--r----1--r--I--
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)
❑ Inflow
❑ Primary

50 YEAR - 6 HR STORM

30S
DA-1 (PRE MAP-1.0)
49L
4HS COMBINED PRE
DEVELOPED
DA-2 (PRE MAP-1.0)
34S N 36P
DA-1 (POST MAP 2.0) SAND
FILTER/DETENTION
40S N 41 P
DA-2 (POST MAP-2.0) WET POND 42L
47S COMBINED POST
DEVELOPED FLOW
DA-3 Bypass (POST
MAP-2.0)
45S
DA-4 Stream Buffer
(Post Map 2.0)
Subcat Reach on Link Routing Diagram for 4598 - ALEXANDER FARMS STORMWATER CONTROL
Prepared by COLEJENEST & STONE, Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment 30S: DA-1 (PRE MAP-1.0)
Runoff = 109.12 cfs @ 3.44 hrs, Volume= 8.073 af, Depth= 1.90"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 50-yr Rainfall=4.92"
Area (sf) CN Description
2,221,641 69 Weighted CN
2,221,641 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
25.1 Direct Entry, TC
Subcatchment 30S: DA-1 (PRE MAP-1.0)
Hydrograph
�
�---+--+--+--+--+--�--+--+--+--+--�---�---�--+--+--+--�---�---�--+--+--
■Runoff
109.12cfs
-----J--1--1--L--
-----
-------'---'---------------'---------------------------'---
--
--r--r--r----r--
--1--J--1--1--L--1------�
--r--r---------
la 'IO--fiyhr 1 50- r-
110
105
1
95
-----+--+--+--+--+----+--+--+--+----------+--+-a��J?4.�r_
90
85
------------------------;--+--
--lJ'ndffAr6a=�2'CrC41rCf-
$0
-----;--;--;--;--;----;--;--;--;--I_R'�unoffVoILr1rteTBJ-07�-if-
I
w 70
65
---
------,--
- - ; -
- --+--
--
------------,--
--'
----;-----+--}--------
--
--------,--
'Mmdff-Depth' gw. -
-
o--
60
--i--
--
- r
--
--r
--
------
--
- r --
----
--
--
r r
-- --
- ---
--
---
--
r
-- -- - ----
r r r r r
LL-
50
45
r--r-r--r----r--r--r--r--r--r----r--r--r--r---
r-
- r-
- r-
-
r�`-
Yaa=a+ ja
r-
40
---'---'---'--'---'---'---'---'---'---'--'---'----------------------------'---
35
-----+--+--+--+--+----+--+--+--+----------+--+--+----------+--+--
25
---1--J--1--
--L--L----J--
--1--L--1------'--
-- -- ----------1--L--
20
15
r--r-r--r--r--r--r--i--r--r--r--r--r--r--i--r--r--r--r--r--i--r--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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE Printed 7/30/2021
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Summary for Subcatchment 48S: DA-2 (PRE MAP-1.0)
Runoff = 16.22 cfs @ 3.66 hrs, Volume= 1.570 af, Depth= 1.98"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 50-yr Rainfall=4.92"
Area (sf) CN Description
414,981 70 Weighted CN
414,981 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
40.8 Direct Entry, TC
Subcatchment 48S: DA-2 (PRE MAP-1.0)
Hydrograph
1844-------1--L----1---1---1--J--1--1--+--1--L-------J----+--L--1-- ■Runoff
16.22 cfs C } c
16-
15 _
14 ----- -- --T --i---------- -- -- --i --i - Rai faltT 2i.r-
-- -- ------------ -- -- -p- � -- --- / --- - -- ----;-�-/�-,-
13
12---1---1--+--+--+--+------------�-- +-----+--�
i�nQ #fVQIL;me=�: �- -
10
--Runoff Depttv=l-.96
3 9-------- -- -- ------------ -- -- -- ----------i --
LL - -- -- Td=40.8 to i �
------- -------- -- - -- _
- - - - - - - - - - - - - -
7
---- -- CAN 70--
6--------y--rt--t--r--'r-------y--rt--rt--+--r--'r-------y----+--t--r--
5-------- -- -- ----+------- -- -- -- ----+------- -- -- -- --+--
4
--'---'--�--1--L--L--1---1---1--J--1--1--+--L--L--1---'--1--�--+--L--1--
3--1---1--1--1--L----1---1---1--J--1--1--+--L--+-------J--1--+--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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE Printed 7/30/2021
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Summary for Link 49L: COMBINED PRE DEVELOPED
Inflow Area = 60.529 ac, 0.00% Impervious, Inflow Depth = 1.91" for 50-yr event
Inflow = 121.31 cfs @ 3.46 hrs, Volume= 9.643 of
Primary = 121.31 cfs @ 3.46 hrs, Volume= 9.643 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 49L: COMBINED PRE DEVELOPED
Hydrograph
❑Inflow
---------------------I-------r�
----------I-_-----I--- ❑ Primary
121.31 cfs
--r--r--r--j1f1OWAFe#-QQ.5g9!a0--
120rI rI -
110I I I I I I I I I I I I
--I-- --I-------I-------I--; --I--
--J--1--L--1--1--L--1---1--1--L--1-----1--L--1--J--1--L--1--1--L--1---
100 I I I I I I I I I I I I I I I I I I I I I I I
--+--+--+----+--+-------+--+-------+--+----+--+--+----+--+--I---
90 I I I I I I I I I I I I I I I I I I I I I I
80 I--y--+--r--I--�--r--r--I--rt--r--r--I--+--r--I--y--+--r--I--�--r--r--
N I I I I I I I I I I I I I I I I I I I I I I
V I I I I I I I I I I I I
i
70---I--;-----I--;
3 I I I I I I I I I I I I I I I I I I I I I I
p____________I__I__I___I__I__I__I___I__I__I
LL 60
50 -- -- -- --I-- ---------'---------+-- --I-- -- -- --I-- -- --I---
40 --r--r--r----r--r--r----r--r-------r--r----r--r--r----r--r--r--
30
20
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 34S: DA-1 (POST MAP 2.0)
Runoff = 80.07 cfs @ 3.15 hrs, Volume= 3.555 af, Depth= 3.49"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 50-yr Rainfall=4.92"
Area (sf) CN Description
532,153 87 Drainage Area 1
532,153 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, TC
Subcatchment 34S: DA-1 (POST MAP 2.0)
Hydrograph
--'---'�---'�--,--�--r--r--'�---'�---'�--�--�--�--T--r--'r--'�---'�--�--�--7--r--'r-- ■Runoff
80.07 cfs----------- -- --------I-- -- ----+--r--'-----I-- -- -- --r--' --
80 - -- -- -- --' -- ----+--C4arlo�te-6-1hir 50-yT
75-------'----1--L----1---1---1--J--1--1--1--L-------'-- - 1--1--L--L
70- RainfallT4.92"
65-------,-- -------------------�, -- -- -, RUnoff A---0a-,r32 1-53 .4f
60
- --r-- ---R --- - _Ql me '3.$5$ �f -
55----------+--+--r--r---------�--�-
50--------- -- -- ------------ -- -- ----RLmoff�D"th:*.49"-
3 45---'---'--L--1--L--L--1---1---1--J--1--1--1--L--L-----'--1 1-L--L--
FL
40-
-- ------------ -- -- ----------- --- -- -- --
35 CN87 -
30
-- -- ------------ -- -- -- -- --------- -- -- -- -- --
25 -------1--+--+--r--r-------------+--r--r-----------+--r--r--
20------------------------'--'---------------------�--
15 ---1--J--1--1--L--L--L--1---1--J--1--1--1--L--L--1---1--J--1--1--L--L--
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 5
Summary for Subcatchment 40S: DA-2 (POST MAP-2.0)
Runoff = 210.43 cfs @ 3.15 hrs, Volume= 9.170 af, Depth= 3.10"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 50-yr Rainfall=4.92"
Area (sf) CN Description
1,545,417 83 WET POND POST
1,545,417 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 40S: DA-2 (POST MAP-2.0)
Hydrograph
'---'-- I'--'---'---'---'---'-- I'-- I'--'---'---'---'-- I'--'---'---'---'---'-- I'--'--- ■Runoff
210.43 cfs--;-- ----r--+----;-- ----r----------;--;-;�----------;--;--
200
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
190-1---1--+--+--+--r--+--1--+--+--+--+--1---1---1--+--+- a1 11s4A22' -
180---- - - -- -- 1, -- 1, --�,-----�,-- i1 -- ----------�-- -- --;------------- --
-1---1--J--1--i--L--+----r---i--i--L-- L
160 �u�ndff Aj`�a�'Fy545, 9 J si -
160-r--1--r--r--r--r--r--1--r--r--r--r--r-a-1---1--r--rr�-l-r--r--i---y--rtn--�,+1--
150-----'i'i---'i --'i --'i --'i-------;-- +i _I
--li Runoff ViV1i�,-9.117 C�
140 ------ -- -- --L-- ---- ----+--L--1---1---1-- ----r-----I---1---+--
w 130-----;--;--T--;--'r----;----------- ------IRLmGffrDepth =, 3 W' -
120-------'-- -- ----------'-- -- ----------'-- -- -- --------
------
- tc 5-, Ok
LL 100 1---1----7--r--r--r--1------+--r--1---1---1--,--r--r--1---1--�-�_
90 ---'---'--L--L--L--'---'---'--L--L--L----------L--L--L-----'-
80---1----------I--L---------------+--L---------- ----r---------- --+--
70 1 1 1 1 1 1 1
r--r--r--r--r--1--r--r--+--r--i --1- 1- r--r--r--i --r 1- r--+--
60------'-- -- ----------'-- -- ----------'-- -- ----------'-- -- --
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
50 ---1--+--+--+--+--+--1--+--+--+--+--1---1---1--+--+--+--1---1---1--+--+--
40 1 1 1
r--r--r--r--r--1--r--r--+--r--i --1- 1- r-- r - -r--i --r 1- r--+--
30-------L-- L--L------------'--L------------' --'--------'-- --' --
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
20--1--+--+--+--+--+--1--+--+--+--+--1---1---1--+--+--+--1---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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 7
Summary for Subcatchment 47S: DA-3 Bypass (POST MAP-2.0)
Runoff = 16.80 cfs @ 3.63 hrs, Volume= 1.570 af, Depth= 1.98"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 50-yr Rainfall=4.92"
Area (sf) CN Description
414,982 70 Weighted CN
414,982 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
38.5 Direct Entry, TC
Subcatchment 47S: DA-3 Bypass (POST MAP-2.0)
Hydrograph
---------------------------------------------------
� � � � � � � � � � � � � � � � � � � ■Runoff
16.80 cfs - -- -- - -- -- --T T F- -- --
16------',-- -------------------',-- -- ----Cltarlo�te, 6�hi r', 5-0-yr -
15------------, --,----------------- --r----rRainfalP4.92i" -
14
--- _F T---- Rfunrofif Area 4T �982 f -
13-----r--r--�1-------I--I--I�-+--r + -I -�� �- +--r-�+f--
12 �r-------y--rt--r--r--�r-------�--rt--'iR-qnpfi�Vl i@=1-070-cj
11 -----+--+--PM
+--+--+----------+--+--+--+--+p--+-------+--+--+--+--+--
10 RunQf# Depth-:a-98�� -
+-+--+--+--+--+--+--+--+-+--+--+--+--+-
0 9--------+--+--+--+----------+--+--+--+--+--+--I-- - +
LL 8 �=38.51nih
6------'----1--L----1---1---1--J--1--1--+--L--L-------J----+--L--L--
5--------L-1--L----1---1---1--J--1--1--+--L--+-------J--1--+--L-- --
4
3
2
1 I I 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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 45S: DA-4 Stream Buffer (Post Map 2.0)
Runoff = 13.99 cfs @ 3.24 hrs, Volume= 0.729 af, Depth= 2.64"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 50-yr Rainfall=4.92"
Area (sf) CN Description
144,081 78 Weighted CN
144,081 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
min) (feet) (ft/ft) (ft/sec) (cfs)
11.2 Direct Entry, TC
Subcatchment 45S: DA-4 Stream Buffer (Post Map 2.0)
Hydrograph
--'---'�---'�---'�---'� --'� --'� --'�--'�---'�---'�---'� ---'� --'-� --'� --'�--'�---'�---'�---'� ---'� --'� --'� -- ■Runoff
13.99 cfs-----r----r--r----------r-- r--r--r--r--'r--I ---
I----,--r--r--r--
14----I'i---I'i-- I'i-- I'i-----I'i---I'i---------''-- -- --'--G4arlo�te�-h� 50-yjr -
13 I I I I y1 ,.I1 IQ I
r-
------t--t--r--r--r-------t--t--t-- t--r--r--I Rai ffall:4.J2Pc
12
-----------------------------
11--------=-- --! --! --------- -- -- R�j�n�o�fff`Are�';ja�;144,08'1_i9if
-pI
9-
8- w----------- --T------------,-- ----T--RunoffD�pthT2.6414-
3 I'---;---;--�--1--L--�--1---1---1--J--1--1--1--L--L--1---1--J--1--1--L--�--
LL
7 - - - - - - - - - - Td=11.'2 tnii�_
-- ------------ -- -- ----------- --- -- -- -- ------ - -- - -- -
------';-- --i-- ------------J--1--1--1--L--' -------J--1-PN=78-
5 I 1 I
T - - T - - T - - T T - - T - - T - - T - - T - - T - - T - - T - - T - - T - -
4 I I I
'---'---'---1--1--L1---1---1--J--1--1--1--L--L--1---1--J--1--1--L--�--
3
2
1 I I 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 ss 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 9
Summary for Pond 36P: SAND FILTER/DETENTION
Inflow Area = 12.217 ac, 0.00% Impervious, Inflow Depth = 3.49" for 50-yr event
Inflow = 80.07 cfs @ 3.15 hrs, Volume= 3.555 of
Outflow = 54.61 cfs @ 3.25 hrs, Volume= 3.554 af, Atten= 32%, Lag= 5.8 min
Primary = 54.61 cfs @ 3.25 hrs, Volume= 3.554 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 764.39' @ 3.25 hrs Surf.Area= 18,320 sf Storage= 62,912 cf
Plug -Flow detention time= 365.4 min calculated for 3.554 of (100% of inflow)
Center -of -Mass det. time= 365.3 min ( 572.4 - 207.2 )
Volume Invert Avail.Storage Storage Description
#1 760.00' 79,733 cf Custom Stage Data (Irregular)Listed below (Recalc)
Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area
(feet) (sq-ft) (feet) (cubic -feet) (cubic -feet)
760.00 10,534 547.0 0 0 10,534
761.00 12,209 569.0 11,361 11,361 12,566
762.00 13,945 588.0 13,067 24,429 14,408
763.00 15,739 607.0 14,833 39,262 16,311
764.00 17,589 626.0 16,655 55,917 18,275
765.00 19,496 644.0 18,534 74,451 20,202
765.25 22,799 676.0 5,281 79,733 23,567
Device Routing Invert Outlet Devices
#1 Primary 756.00' 30.0" Round 30" RCP L= 116.8' Ke= 0.200
Inlet / Outlet Invert= 756.00' / 755.25' S= 0.0064 T Cc= 0.900
n= 0.013 Concrete, trowel finish, Flow Area= 4.91 sf
#2 Device 1 760.00' Sand Filter 1 & 2
Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00
Disch. (cfs) 0.000 0.200 0.257 0.314 0.371 0.428 0.428
#3 Device 1 762.00' 3.0" Vert. CPV control C= 0.600 Limited to weir flow at low heads
#4 Device 1 763.00' Custom Weir/Orifice FLOOD STORM, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 1.75
Width (feet) 9.00 9.00 16.00 16.00
Primary OutFlow Max=54.24 cfs @ 3.25 hrs HW=764.38' (Free Discharge)
L1=30" RCP (Passes 54.24 cfs of 67.18 cfs potential flow)
12=Sand Filter 1 & 2 (Custom Controls 0.39 cfs)
3=CPV control (Orifice Controls 0.36 cfs @ 7.24 fps)
4=Custom Weir/Orifice FLOOD STORM (Weir Controls 53.49 cfs @ 3.53 fps)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 10
Pond 36P: SAND FILTER/DETENTION
Hydrograph
-
80.07 cfs
---
T--T--T-----II--
-T-------T-
--T--II
-T-
- -----
----T--
-T-
T
- r--------T--T-------T-- T-- r- - -i--
-- IT - - - - - -- T--T-------T--T--IT--II--
■Inflow
■ Primary
8
I
---+--+--r--r--r----+--+
I I
I I
I I
--+--+--
I
I I I
I
I I I I I I I I
+ r I--
-Ifl\N-�1re= 2T21�
80
75
---+--+--+--+-+--+--+--+-+--+--+--+---GQn+EFc�/
F7�Fa7a%,-
70
65
- ,-
---
-- --
-----'--
--
-----'--
--+--'
I_forage=_62r9'L2 Cf T
54.61 cfs-J--1--L-----1--1--L--L----J--1--L----J--i--
-L--IL----
-------i-
5s
w 50
3 45
LL 40
35
30
-�iT--T--T--T--�i--T--T--��--�i--T--T--�+--�i
--I--T--T--T--I---I--T--T-------T--T--T--I--
-�--T--T--�r--�i--T--T--�+--�i--
25
i----T--T---------+--I
20
I--�--�--r--r--I--�--+--I---I--�--T--r--r--I--T--r--I---I--�--r--r--I--
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE
Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC
Page 11
Summary for Pond 41 P: WET POND
Inflow Area
= 35.478 ac,
0.00% Impervious, Inflow Depth = 3.10" for 50-yr event
Inflow
= 210.43 cfs @
3.15 hrs, Volume= 9.170 of
Outflow
= 59.67 cfs @
3.41 hrs, Volume= 8.829 af, Atten= 72%, Lag= 15.5 min
Primary
= 59.67 cfs @
3.41 hrs, Volume= 8.829 of
Routing by
Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Starting Elev=
748.50' Surf.Area= 31,630 sf Storage= 209,326 cf
Peak Elev=
753.81' @ 3.41 hrs
Surf.Area= 45,404 sf Storage= 420,275 cf
(210,949 cf above start)
Plug -Flow detention time= 1,594.9
min calculated for 4.023 of (44% of inflow)
Center -of -Mass det. time= 720.9
min ( 931.3 - 210.4 )
Volume
Invert Avail.Storage Storage Description
#1
738.00' 479,780 cf POND STORAGE (Irregular)Listed
below (Recalc)
499,894 cf Overall - 20,114 cf Embedded = 479,780 cf
#2
738.00' 8,046 cf RIP -RAP DISPLACEMENT (Prismatic)Listed below (Recalc) Inside #1
20,114 cf Overall x 40.0% Voids
487,826 cf Total Available Storage
Elevation
Surf.Area
Perim. Inc.Store Cum.Store
Wet.Area
(feet)
(sq-ft)
(feet) (cubic -feet) (cubic -feet)
738.00
13,948
603.0 0 0
13,948
739.00
15,175
623.0 14,557 14,557
15,993
740.00
16,443
644.0 15,805 30,362
18,203
741.00
17,752
664.0 17,093 47,455
20,385
742.00
19,100
681.0 18,422 65,877
22,325
743.00
20,476
694.0 19,784 85,661
23,905
744.00
21,879
708.0 21,174 106,835
25,617
745.00
23,309
721.0 22,590 129,425
27,259
746.00
24,765
734.0 24,033 153,458
28,931
747.00
26,247
747.0 25,502 178,961
30,633
748.00
27,753
759.0 26,996 205,957
32,256
748.50
31,630
791.0 14,835 220,792
36,222
749.00
35,679
823.0 16,817 237,610
40,352
750.00
37,655
854.0 36,663 274,272
44,573
751.00
39,603
879.0 38,625 312,897
48,128
752.00
41,610
903.0 40,602 353,499
51,646
753.00
43,677
928.0 42,639 396,139
55,402
754.00
45,806
952.0 44,737 440,876
59,113
755.00
47,996
977.0 46,897 487,773
63,070
755.25
48,976
983.0 12,121 499,894
64,038
Elevation
Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
738.00
1,820
0 0
748.50
1,820
19,110 19,110
748.51
1,000
14 19,124
749.50
1,000
990 20,114

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 12
Device
Routing
Invert
Outlet Devices
#1
Primary
747.30'
42.0" Round 42" RCP OUTFALL
L= 52.9' RCP, mitered to conform to fill, Ke= 0.700
Inlet / Outlet Invert= 747.30' / 747.00' S= 0.0057 T Cc= 0.900
n= 0.013 Concrete pipe, bends & connections, Flow Area= 9.62 sf
#2
Device 1
748.50'
2.5" Horiz. INVERTED WATER QUALITY ORIFICE C= 0.600
Limited to weir flow at low heads
#3
Device 1
750.25'
4.3" Vert. 4.25" ORIFICE C= 0.600
Limited to weir flow at low heads
#4
Device 1
751.75'
4' WIDE X 1.25' TALL WEIR X 2.00, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.25
Width (feet) 4.00 4.00
#5
Device 1
754.00'
EMERGENCY WEIR X 4.00, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00
Width (feet) 5.00 5.00
Primary OutFlow Max=59.61 cfs @ 3.41 hrs HW=753.81' (Free Discharge)
L1=42" RCP OUTFALL (Passes 59.61 cfs of 89.17 cfs potential flow)
2=INVERTED WATER QUALITY ORIFICE (Orifice Controls 0.38 cfs @ 11.09 fps)
3=4.25" ORIFICE (Orifice Controls 0.89 cfs @ 8.85 fps)
4=4' WIDE X 1.25' TALL WEIR (Orifice Controls 58.34 cfs @ 5.83 fps)
5=EMERGENCY WEIR ( Controls 0.00 cfs)
Pond 41 P: WET POND
Hydrograph
2210.43
-+--+--'----L--'---'----r--------r------+--+------L--�--
--r--�r--�i--�--r--�r--�i--�--r--�r--�i--7--r--�r-�--r--�r--�i--�--r--r
- -
■ Inflow
■ Primary
CfS
220
--------------
----------
--
---=
jnfto� Arlo#=�=6-4781ao_-
210
---+--+--r----+--+--r----+--r--r
-r -i- -i- + -
200
190
---
-- --
----
--
-------
--
-------
180
170
---
----'--'-------------------------------'�
--r--
----
--r--
------r-------T
---- --r - --
vT-age=
160
-li--y--+--Ir--li--I--r--Ir--li--rt--r--Ir--li--+--r----+--+--r----+--+--r--
150
----------------------------------------------------------------
140
---
-- --
----
--
-------
--
-------+--
---- -- -- ---- -- -----
w 130
u
" 120
---J--1--L--1--1--L--1---1--1--L--1---'--1--L--1--J--1--L--1--1--L--1---
0 110
-1-----
r--r----
--r-------
--r-------7--r----
--r--r------r-----
LL100
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90
---
--+--+--i--
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--r-------+--r--i--
--+--+--i----+--i---
59.67 cfs
--------------------------------------------------------------
60
--
--r--
----
--r--
------r-------T--r----
--r-- ---- --r-- --
50
--J--
--L--'--
--L--1---1--1--L--1-----1--L--1--J--1--L--1--
--L--'---
40
--r--r--r--i--r--r--r--i--r--r--r--i--r--r--r-r--r--r--i--r--r--r--
30 ---'--'---'---'---'--'---'---'---'--'---'---'---------------------------'---
20
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)

4598 - ALEXANDER FARMS STORMWATER CONTROLCharlotte 6-hr 50-yr Rainfall=4.92"
Prepared by COLEJENEST & STONE Printed 7/30/2021
HydroCADO 10.10-4b s/n 08470 © 2020 HydroCAD Software Solutions LLC Page 13
Summary for Link 42L: COMBINED POST DEVELOPED FLOW
Inflow Area = 60.529 ac, 0.00% Impervious, Inflow Depth > 2.91" for 50-yr event
Inflow = 124.63 cfs @ 3.28 hrs, Volume= 14.682 of
Primary = 124.63 cfs @ 3.28 hrs, Volume= 14.682 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 42L: COMBINED POST DEVELOPED FLOW
Hydrograph
--1--L--1--L--L--'---'--L--L--'---'--L--L----J--+--L----L--L--'---
❑ Inflow
- � � � � � � � � � �
--+---+-----+--+-+--+--+--�--Infrow',A�e#=G�'',.-5�9'aao--
❑ Primary
124.63
cfs
120
'7 T' ' ' 'T F'-1 T F'-T T'
110
100
90
--L--+--L----L--+------L--r-------+--r----L--+--L----L--+-- --
u
'
---'--'---L--'---'--'---'---'---'--'---'---'----------------L----------'---
70
--+--+--+----+--+-------+--r-------+--+----+--+--+----+--+--+--
0
- 60
'
I +--r- ---I T --r +--r------+--r----7--+
50
I--L--L--L--'--L--L--'---'--L--L--'--L--L--L--'--L--L--L--'--L--L--'---
'
--L--L--L----L--L-------L--L-------+--L----L--L--L----L--L--i---
30
- 1 - - + - - F - -I- - 7 - - + I 7 - - T I + - - F - -I- - 1 - - + - - F - -I- - 7 - - +
20
--------------------------------------------------------------
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)

STORM DRAINAGE ANALYSIS

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EROSION CONTROL

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
SB-1 - Ditch 1
Trapezoidal
Bottom Width (ft)
= 2.00
Side Slopes (z:1)
= 3.00, 3.00
Total Depth (ft)
= 1.75
Invert Elev (ft)
= 766.00
Slope (%)
= 1.50
N-Value
= 0.030
Calculations
Compute by:
Known Q
Known Q (cfs)
= 33.19
Elev (ft) Section
768.00
767.50
767.00
766.50
766.00
765.50
2 4 6
Thursday, Aug 5 2021
Highlighted
Depth (ft)
= 1.22
Q (cfs)
= 33.19
Area (sqft)
= 6.91
Velocity (ft/s)
= 4.81
Wetted Perim (ft)
= 9.72
Crit Depth, Yc (ft)
= 1.22
Top Width (ft)
= 9.32
EGL (ft)
= 1.58
8 10 12 14 16 18
Reach (ft)
Depth (ft)
2.00
1.50
1.00
0.50
MI
_n r1n

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
SB-1 - Ditch 2
Trapezoidal
Bottom Width (ft)
= 1.50
Side Slopes (z:1)
= 3.00, 3.00
Total Depth (ft)
= 1.50
Invert Elev (ft)
= 769.00
Slope (%)
= 1.80
N-Value
= 0.030
Calculations
Compute by:
Known Q
Known Q (cfs)
= 3.37
Elev (ft)
771.00
770.50
770.00
769.50
769.00
768.50
0 2 4 6
Section
8
Reach (ft)
Thursday, Aug 5 2021
Highlighted
Depth (ft)
= 0.43
Q (cfs)
= 3.370
Area (sqft)
= 1.20
Velocity (ft/s)
= 2.81
Wetted Perim (ft)
= 4.22
Crit Depth, Yc (ft)
= 0.41
Top Width (ft)
= 4.08
EGL (ft)
= 0.55
10 12 14 16
Depth (ft)
2.00
1.50
1.00
0.50
_n r1n

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
SB-2 - Ditch 2
Trapezoidal
Bottom Width (ft)
= 1.50
Side Slopes (z:1)
= 3.00, 3.00
Total Depth (ft)
= 1.50
Invert Elev (ft)
= 769.00
Slope (%)
= 1.80
N-Value
= 0.030
Calculations
Compute by:
Known Q
Known Q (cfs)
= 29.99
Elev (ft)
771.00
770.50
770.00
769.50
769.00
768.50
0 2 4 6
Section
8
Reach (ft)
Friday, Aug 6 2021
Highlighted
Depth (ft)
= 1.18
Q (cfs)
= 29.99
Area (sqft)
= 5.95
Velocity (ft/s)
= 5.04
Wetted Perim (ft)
= 8.96
Crit Depth, Yc (ft)
= 1.22
Top Width (ft)
= 8.58
EGL (ft)
= 1.58
10 12 14 16
Depth (ft)
2.00
1.50
1.00
0.50
_n r1n

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
SB-2 - Ditch 2
Trapezoidal
Bottom Width (ft)
= 1.50
Side Slopes (z:1)
= 3.00, 3.00
Total Depth (ft)
= 2.00
Invert Elev (ft)
= 756.00
Slope (%)
= 1.20
N-Value
= 0.030
Calculations
Compute by:
Known Q
Known Q (cfs)
= 27.33
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Friday, Aug 6 2021
= 1.24
= 27.33
= 6.47
= 4.22
= 9.34
= 1.17
= 8.94
= 1.52
Elev (ft) Section Depth (ft)
759.00
758.50
3.00
2.50
758.00
757.50
2.00
1.50
757.00
756.50
1.00
0.50
756.00
7rr F^
0.00
0 50
2 4 6 8 10
Reach (ft)
12 14 16
18

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
SB-3 - Ditch 1
Trapezoidal
Bottom Width (ft)
= 2.00
Side Slopes (z:1)
= 3.00, 3.00
Total Depth (ft)
= 1.50
Invert Elev (ft)
= 760.00
Slope (%)
= 2.60
N-Value
= 0.030
Calculations
Compute by:
Known Q
Known Q (cfs)
= 3.24
Elev (ft)
762.00
761.50
761.00
760.50
760.00
759.50
0 2 4 6
Section
8
Reach (ft)
Friday, Aug 6 2021
Highlighted
Depth (ft)
= 0.35
Q (cfs)
= 3.240
Area (sqft)
= 1.07
Velocity (ft/s)
= 3.04
Wetted Perim (ft)
= 4.21
Crit Depth, Yc (ft)
= 0.36
Top Width (ft)
= 4.10
EGL (ft)
= 0.49
10 12 14 16
Depth (ft)
2.00
1.50
1.00
0.50
_n r1n

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
SB-3 - Ditch 2
Trapezoidal
Bottom Width (ft)
= 1.50
Side Slopes (z:1)
= 3.00, 3.00
Total Depth (ft)
= 2.00
Invert Elev (ft)
= 760.00
Slope (%)
= 1.00
N-Value
= 0.030
Calculations
Compute by:
Known Q
Known Q (cfs)
= 13.86
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Friday, Aug 6 2021
= 0.96
= 13.86
= 4.20
= 3.30
= 7.57
= 0.85
= 7.26
= 1.13
Elev (ft) Section Depth (ft)
763.00
762.50
3.00
2.50
762.00
761.50
2.00
1.50
761.00
760.50
1.00
0.50
760.00
7FQ F^
0.00
0 50
2 4 6 8 10
Reach (ft)
12 14 16
18

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
SB-4- Ditch 1
Trapezoidal
Bottom Width (ft)
= 1.50
Side Slopes (z:1)
= 3.00, 3.00
Total Depth (ft)
= 1.50
Invert Elev (ft)
= 754.50
Slope (%)
= 1.00
N-Value
= 0.030
Calculations
Compute by:
Known Q
Known Q (cfs)
= 7.12
Elev (ft)
Section
Friday, Aug 6 2021
Highlighted
Depth (ft)
= 0.71
Q (cfs)
= 7.120
Area (sqft)
= 2.58
Velocity (ft/s)
= 2.76
Wetted Perim (ft)
= 5.99
Crit Depth, Yc (ft)
= 0.61
Top Width (ft)
= 5.76
EGL (ft)
= 0.83
Depth (ft)
757.00
c.,)v
756.50
756.00
2.00
1.50
755.50
1.00
755.00
0.50
754.50
7rA nn
0.00
_n r1n
0
2 4 6
8
Reach (ft)
10 12 14 16

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
SB-5- Ditch 1
Trapezoidal
Bottom Width (ft)
= 1.50
Side Slopes (z:1)
= 3.00, 3.00
Total Depth (ft)
= 1.50
Invert Elev (ft)
= 754.50
Slope (%)
= 1.50
N-Value
= 0.030
Calculations
Compute by:
Known Q
Known Q (cfs)
= 3.24
Elev (ft)
Section
Friday, Aug 6 2021
Highlighted
Depth (ft)
= 0.44
Q (cfs)
= 3.240
Area (sqft)
= 1.24
Velocity (ft/s)
= 2.61
Wetted Perim (ft)
= 4.28
Crit Depth, Yc (ft)
= 0.41
Top Width (ft)
= 4.14
EGL (ft)
= 0.55
Depth (ft)
757.00
c.Z)v
756.50
756.00
2.00
1.50
755.50
1.00
755.00
0.50
754.50
7rA nn
0.00
_n r1n
0
2 4 6
8
Reach (ft)
10 12 14 16

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
SB-5- Ditch 2
Trapezoidal
Bottom Width (ft)
= 1.50
Side Slopes (z:1)
= 3.00, 3.00
Total Depth (ft)
= 1.50
Invert Elev (ft)
= 754.50
Slope (%)
= 1.00
N-Value
= 0.030
Calculations
Compute by:
Known Q
Known Q (cfs)
= 9.31
Elev (ft)
Section
Friday, Aug 6 2021
Highlighted
Depth (ft)
= 0.80
Q (cfs)
= 9.310
Area (sqft)
= 3.12
Velocity (ft/s)
= 2.98
Wetted Perim (ft)
= 6.56
Crit Depth, Yc (ft)
= 0.70
Top Width (ft)
= 6.30
EGL (ft)
= 0.94
Depth (ft)
757.00
c.,)v
756.50
756.00
2.00
1.50
755.50
1.00
755.00
0.50
754.50
7rA nn
0.00
_n r1n
0
2 4 6
8
Reach (ft)
10 12 14 16

13' r
MINIMUM VALUES
STRUCTURE: FES-BP-8 Appendices
Do= 2.0'
W= 1 5'
3Do= 6'
d50= 6"
Qfun= 1 2.31 cfs
dm 9"
La I
t= 13.5"
in_ ---IT
2.31 cfs Discharge (ft3/sec)
10-yr storm
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw t 0.5 diameter).
6" min.
Rev. 12/93
8.06.3

1E
MINIMUM VALUES
STRUCTURE: FES-BP-8 Appendices
Do= 2.0'
W= 1 5'
3Do= 6'
d50= 6"
Qfun= 1 2.31 cfs
dm 9"
La I
t= 13.5"
in_ ---IT
IMM
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw t 0.5 diameter).
6" min.
Rev. 12/93
8.06.3

01FINI i1
MINIMUM VALUES
STRUCTURE: FES-BP-8 Appendices
Do= 2.0'
W= 1 5'
3Do= 6'
d50= 6"
Qfun= 1 2.31 cfs
dm 9"
La I
t= 13.5"
in_ ---IT
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw t 0.5 diameter).
6" min.
Rev. 12/93
8.06.3

21'min
IMINIMUM VALUES
STRUCTURE: FES-BP-8 Appendices
D,—
W= 15'
3Do=
d50= 6"
Qf.ii= 1 2.31 cfs
d..= 9.1
L.= I
t= 13.5"
-4— t��I
Outlet W = Do + La
pipe I
diameter (Do)
�—La ----I
-���Tl a ii I �water -� 0. 5DO
�)K -
xfl
0 7
50
54.34 ds 1 0-yr 3
Discharge (ft
Curves may not be extrapolated.
a
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter).
Rev. 12/93
8.06.3

23
IMINIMUM VALUES
STRUCTURE: FES-BP-8 Appendices
D,-
W= 15'
3Do=
d50= 6"
Qf.ii= 1 2.31 cfs
d..= 9.1
L.= I
t= 13.5"
in- ---IT
12
3
8" min.
3 5 10 20 50 100 200 500 1000
26.05 cfs Discharge (ft3/sec)
1 0-yr
storm
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter).
Rev. 12/93
8.06.3

23
MINIMUM VALUES
STRUCTURE: FES-BP-8 Appendices
Do= 2.0'
W= 1 5'
3Do= 6'
d50= 6"
Qfun= 1 2.31 cfs
dm 9"
La I
t= 13.5"
in_ ---IT
12
3
8" min.
3 5 10 20 50 100 200 500 1000
Discharge (ft3/sec)
69.35 cfs
10-yr storm
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw t 0.5 diameter).
Rev. 12/93
8.06.3

23
STRUCTURE: FES'BP'8 Appendices
3D"~
Jm~
Vf.ii~ 1 2.
J=~ 9.1
U
3
8" min.
3 5 lU 20 50 100 200 500 1000
Diocharge(ftYeen)
47.90 cfs
Curves may not beextrapolated. 10-V[storm
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter).
Rev. 12/93

20
IMINIMUM VALUES
STRUCTURE: FES-BP-8 Appendices
D,-
W= 15'
3Do=
d50= 6"
Qf.ii= 1 2.31 cfs
d..= 9.1
L.= I
t= 13.5"
in- ---IT
12
3
7" min.
3 5 10 20 50 100 200 500 1000
ni,zrhnrqe (ft3/SeC)
36.33 cfs
1 0-yr storm
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter).
Rev. 12/93
8.06.3

Contact Name*
Patrick Korn
Contact Email Address*
[e-mail]
Project Owner*
WIN Development
Project Name*
Alexander Farms
Project County*
Mecklenburg
Owner Address:*
Street Address
2165 Louisa Drive
Address Line 2
aty
Bellair Beach
Postal / Zip axle
33786
Is this a transportation project?*
C Yes c: No
Type(s) of approval sought from the DWR:
W 401 Water Quality Certification - F- 401 Water Quality Certification -
Regular Express
F- Individual Permit F- Modification
F- Shoreline Stabilization
Does this project have an existing project ID#?*
c: Yes C No
Please list all existing project ID's associated with this projects.*
SAW-2019-00314
State / Province / Pegion
Florida
Country
Pinellas
Do you know the name of the staff member you would like to request a meeting with?
Please give a brief project description below and include location information.*
The proposed project would consist of the development of
abandoned agricultural land in support of multi and single family
residential and commercial structures. Associated infrastructure
would include access roads, parking spaces, landscaped areas, and
stormwvater piping, inlets, and retention ponds. The project area is
located at the corner of Westmoreland Road and West Catawba
Avenue, Cornelius, NC 28031.
By digitally signing below, I certify that I have read and understood that per the Federal Clean Water Act Section
401 Certification Rule the following statements:
This form completes the requirement of the Pre -Filing Meeting Request in the Clean Water Act Section 401 Certification
Rule.

• I understand by signing this form that Icannot submit myapplication until 30 calendar days after this pre -filing
meeting request.
• I also understand that DWR is not required to respond or grant the meeting request.
Your project's thirty -day clock started upon receipt of this application. You will receive notification regarding meeting location
and time if a meeting is necessary. You will receive notification when the thirty -day clock has expired, and you can submit an
application.
Signature *
Submittal Date 7/6/2021

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
TIM BAUMGARTNER
Director
Jesse McInerney
Alexander Farms MU, LLC
2165 Louisa Dr.
Belleair Beach, FL 33786
Project: Alexander Farms
NORTH CAROLINA
Environmental Quality
August 20, 2021
Expiration of Acceptance: 2/20/2022
County: Mecklenburg
The purpose of this letter is to notify you that the NCDEQ Division of Mitigation Services (DMS) is willing to
accept payment for compensatory mitigation for impacts associated with the above referenced project as
indicated in the table below. Please note that this decision does not assure that participation in the DMS in -
lieu fee mitigation program will be approved by the permit issuing agencies as mitigation for project impacts.
It is the responsibility of the applicant to contact permitting agencies to determine if payment to the DMS will
be approved. You must also comply with all other state, federal or local government permits, regulations or
authorizations associated with the proposed activity including G.S. § 143-214.11.
This acceptance is valid for six months from the date of this letter and is not transferable. If we have not
received a copy of the issued 404 Permit/401 Certification within this time frame, this acceptance will
expire. It is the applicant's responsibility to send copies of the permits to DMS. Once DMS receives a copy
of the permit(s) an invoice will be issued based on the required mitigation in that permit and payment must
be made prior to conducting the authorized work. The amount of the in -lieu fee to be paid by an applicant is
calculated based upon the Fee Schedule and policies listed on the DMS website.
Based on the information supplied by you in your request to use the DMS, the impacts for which you are
requesting compensatory mitigation credit are summarized in the following table. The amount of mitigation
required and assigned to DMS for this impact is determined by permitting agencies and may exceed the
impact amounts shown below.
River Basin
Impact Location
8-di it HUC
Impact Type
Impact Quantity
Catawba
03050101
Warm Stream
347
Catawba
03050101
Riparian Wetland
0.18
Upon receipt of payment, DMS will take responsibility for providing the compensatory mitigation. The
mitigation will be performed in accordance with the In -Lieu Fee Program instrument dated July 28, 2010.
Thank you for your interest in the DMS in -lieu fee mitigation program. If you have any questions or need
additional information, please contact [e-mail].
Sincerely,
FOR James. B Stanfill
Asset Management Supervisor
cc: Patrick Korn, agent
D Q'North Carolina Department of Environmental Quality I Division of Mitigation Services
P217 West Jones Street 11652 Mail Service Center I Raleigh, North Carolina 27699-1652
�+oRrw crww.i+va i
daft /'� 919.707.8976