20230315 - T5CW Stormwater Report_v1
5430 Wade Park Blvd.
Suite 106
Raleigh, NC 27607
T: 919-929-1173
Firm License #: F-1267
www.pennoni.com
Take 5 Car Wash
8232 Market Street,
Wilmington, NC 28411
STORMWATER MANAGEMENT
CALCULATION PACKET
Prepared By:
Pennoni
5430 Wade Park Blvd; Suite 106
Raleigh, NC 27607
(919) 929-1173
Firm License: F-1267
Project #DRVBR22040
March 15, 2023
Professional Engineer: Ethan Mindrebo, PE (emindrebo@pennoni.com)
NC License # 47736
Preliminary
Table of Contents
General Stormwater Management ........................................................................................ 1
General Project Description ............................................................................................................. 1
Stormwater Management ............................................................................................................... 1
Stormwater Conveyance .................................................................................................................. 1
Existing Wet Retention Pond Permit ...................................................................................... 2
Stormwater Conveyance Summary .............................................................................................. 11
Autodesk Storm & Sanitary Analysis (25-year storm event) ......................................................... 11
Drainage Area Plans ...................................................................................................................... 30
General Project Description/Stormwater Management
GENERAL PROJECT DESCRIPTION
The proposed Take 5 Car Wash site is a 1.51-acre (+/-) site within New Hanover County, NC. The
existing site is a restaurant building located on 8232 Market Street. The site is currently
accessed via an entrance off of an NCDOT maintained road. The site is proposed to be
redeveloped with a Take 5 Car Wash, which will include one conveyor wash bay and three pay
stalls. The proposed development will consist of the demolition and removal of the existing
building and infrastructure within the property limits.
STORMWATER MANAGEMENT
Currently, an existing wet detention pond was permitted with the existing development which
allowed 0.91 Ac (39,426 sf) of impervious area to flow to the pond. The proposed impervious
area is approximately 0.67 Ac (25,755.84 sf). The proposed redevelopment decreases the
impervious cover by 0.24 Ac (13,670 SF). The existing wet retention pond will be adequate in
providing stormwater management and nutrient removal due to the decrease in impervious
area. The permit renewal, which was reissued on November 2, 2022, is attached to this report.
STORMWATER CONVEYANCE
The storm drainage system was designed to direct flow to low points and collected via curb inlets
throughout the site which is conveyed to the existing wet detention pond through conduits. A
triangular ditch has been designed to capture water from the western side of the property and
conveyed to a yard inlet which is connected to the existing wet detention pond. This ditch is 12
inches deep and has a 3:1 side slope. Autodesk Storm and Sanitary Analysis 2017 has been utilized
for designing the stormwater conveyance system. Conveyance design precipitation amounts are
based upon NOAA Atlas 14, Volume 2, Version 3 for the 25-year storm event.
Existing Wet Retention Pond Permit
Post-Construction Stormwater Management Systems Permit No. SW8 980236
Page 1 of 1
Hutson & Nieper Enterprises, LLC. Attn: Louis Nieper, Manager 8232 Market St. Wilmington, NC, 28411 Subject: Permit Renewal Post-Construction Stormwater Management Permit No. SW8 980236 J. Michaels Philly Deli North New Hanover County Dear Mr. Nieper: Effective August 1, 2013 the Post-Construction Stormwater Management Program has been transferred from the Division of Water Quality (“DWQ”) to the Division of Energy, Mineral and Land Resources (“DEMLR”). All previous references to DWQ will remain in older permits issued prior to August 1, 2013 until they are modified. Please note that this permit will now reference DEMLR as the Division responsible for enforcement of the permit. The Division of Energy, Mineral and Land Resources received a complete 8-year Permit Renewal Application for the subject permit on October 31st, 2022. The Division is hereby notifying you that permit SW8 980236 has been renewed, updated, and re-issued on November 2nd, 2022, as attached. As requested, a copy of the current operation and maintenance agreement is also enclosed. Please be aware that the renewal and re-issuance of this stormwater permit does not imply that the site is currently in compliance. This permit shall be effective until May 8th, 2030 and does not supersede any other agency permit that may be required. The project shall be subject to the conditions and limitations as specified therein. This permit does not impose new or increased stormwater control requirements; it clarifies the rules and requirements of this program to provide you with a better understanding of your obligations under this permit. Failure to comply with these requirements will result in future compliance problems. Please note that this permit is not transferable except after notice to and approval by the Division. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing by filing a written petition with the Office of Administrative Hearings (OAH). The written petition must conform to Chapter 150B of the North Carolina General Statutes and must be filed with the OAH within thirty (30) days of receipt of this permit. You should contact the OAH with all questions regarding the filing fee (if a filing fee is required) and/or the details of the filing process at 6714 Mail Service Center, Raleigh, NC 27699-6714, or via telephone at 919-431-3000, or visit their website at www.NCOAH.com. Unless such demands are made this permit shall be final and binding. If you have any questions concerning this permit, please contact Aisia Freeman in the Wilmington Regional Office, at phone # (910) 796-7318 or Aisia.freeman@ncdenr.gov Sincerely, For Brian Wrenn, Director Division of Energy, Mineral and Land Resources Enclosures: Attachment A – Designer’s Certification Form Attachment C – Permitting History Copy of the Renewal Application Documents Copy of the Current Operation and Maintenance Agreement DES/af: \\\Stormwater\Permits & Projects\1998\980236 HD\2022 11 permit 980236 cc: Wilmington Regional Office Stormwater File
Post-Construction Stormwater Management Systems Permit No. SW8 980236
Page 1 of 5
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF ENERGY, MINERAL, AND LAND RESOURCES
POST-CONSTRUCTION STORMWATER MANAGEMENT PERMIT
HIGH DENSITY COMMERCIAL DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO
Hutson & Nieper Enterprises, LLC
J. Michael's Philly Deli, North
8232 Market Street, Wilmington, New Hanover County
FOR THE construction, operation and maintenance of one (1) wet detention pond(s) in compliance with the provisions of 15A NCAC 2H .1000 and Session Law 2008-211, as applicable (hereafter collectively referred to as the "stormwater rules") as outlined in the application, approved stormwater management plans, supplement, calculations, operation and maintenance agreement, recorded documents, specifications, and other supporting data (the “approved plans and specifications”) as attached and/or on file with and approved by the Division of Energy, Mineral and Land Resources (the “Division” or “DEMLR”). The project shall be constructed, operated and maintained in accordance with these approved plans and specifications. The approved plans and specifications are incorporated by reference and are enforceable part of this permit. This permit shall be effective from the date of issuance until May 8th, 2030 and shall be subject to the following specified conditions and limitations. The permit issued shall continue in force and effect until the permittee files a request with the Division for a permit modification, transfer, renewal, or rescission; however, these actions do not stay any condition. The issuance of this permit does not prohibit the Director from reopening and modifying the permit, revoking and reissuing the permit, or terminating the permit for cause as allowed by the laws, rules, and regulations contained in Title 15A NCAC 2H.1000 and NCGS 143-215.1 et.al. I. DESIGN STANDARDS 1. This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described in Section I.8 of this permit. The stormwater control has been designed to handle the runoff from 39,426 square feet of impervious area. 3. For the impervious areas added by the modification and applicable to the Session Law 2008-211 rules, a 50’ wide vegetative buffer must be provided and maintained adjacent surface waters, measured horizontally from and perpendicular to the normal pool of impounded structures, the top of bank of both sides of streams and rivers and the mean high water line of tidal waters.
Post-Construction Stormwater Management Systems Permit No. SW8 980236
Page 2 of 5
4. A vegetated filter strip is not required for this pond as it has been designed for a 90% total suspended solids removal efficiency. 5. The tract will be limited to the amount of built-upon area indicated in this permit, and per approved plans. This permit does not provide any allocation of built-upon area for the future development. 6. All stormwater collection and treatment systems must be located in either dedicated common areas or recorded easements. The final plats for the project will be recorded showing all such required easements, in accordance with the approved plans. 7. The runoff from all built-upon area within the permitted drainage area(s) of this project must be directed into the permitted stormwater control system. 8. The following design criteria have been provided in the wet detention pond and must be maintained at design condition: a. Drainage Area, acres: 1.25 Onsite, subject to 15A NCAC 2H.100, ft2: 53,934 Onsite, subject to SL 2008-211, ft2: 516 Offsite, ft2: none b. Total Impervious Surfaces, ft2: 39,426 Onsite, subject to 15A NCAC 2H.100, ft2: 38,910 Onsite, subject to SL 2008-211, ft2: Offsite, ft2: none c. Design Storm: 15A NCAC 2H.1000, inches: 1.0 SL 2008-211, inches: 1.5 d. Pond Design Depth, feet: 5.0 e. TSS removal efficiency: 90% f. Permanent Pool Elevation, FMSL: 12.5 g. Permanent Pool Surface Area, ft2: 2,835 h. Permitted Storage Volume, ft3: 4,291 i. Temporary Storage Elevation, FMSL: 13.8 j. Controlling Orifice: 1.0“Ø pipe k. Orifice flowrate, cfs: 0.03 l. Permitted Forebay Volume, ft3: 715 m. Fountain Horsepower: N/A, PPV <30000 cf n. Receiving Stream/River Basin: UT to Pages Creek / Cape Fear o. Stream Index Number: 18-87-22 p. Classification of Water Body: "SA" II. SCHEDULE OF COMPLIANCE 1. The stormwater management system shall be constructed in its entirety, vegetated and operational for its intended use prior to the construction of any built-upon surface. 2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 3. The permittee shall, at all times, provide the operation and maintenance necessary to assure the permitted stormwater system functions at the design condition The signed and approved Operation and Maintenance Agreement must be followed in its entirety and maintenance must occur at the scheduled intervals.
Post-Construction Stormwater Management Systems Permit No. SW8 980236
Page 3 of 5
4. Records of maintenance activities must be kept and made available upon request to authorized personnel of the division. The records will indicate the date, activity, name of person performing the work and what actions were taken. 5. Decorative spray fountains will not be allowed in the stormwater treatment system as the permanent pool volume is less than 30,000 cubic feet. 6. The facilities shall be constructed, operated, and maintained in accordance with the provisions of this permit, the approved plans and specifications, and the supporting documents attached to this permit and on file with the Division. . 7. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Any deviations from the approved plans and specifications must be noted on the Certification. A modification may be required for those deviations. 8. No person or entity, including the permittee, shall alter any component shown in the approved plans and specifications. Prior to the construction of any modification to the approved plans, the permittee shall submit to the Director, and shall have received approval for modified plans, specifications, and calculations including, but not limited to, those listed below. For changes to the project or SCM that impact the certifications, a new or updated certification(s), as applicable, will be required and a copy must be submitted to the appropriate DEQ regional office upon completion of the modification. a. Any modification to the approved plans and specifications, regardless of size including the SCM(s), BUA, details, etc. b. Redesign or addition to the approved amount of BUA or to the drainage area. c. Further development, subdivision, acquisition, lease or sale of any, all or part of the project and/or property area as reported in the approved plans and specifications. d. Altering, modifying, removing, relocating, redirecting, regrading, or resizing of any component of the approved SCM(s), the stormwater collection system and/or vegetative conveyance shown on the approved plan. e. The construction of any allocated future BUA. f. The construction of any permeable pavement, #57 stone area, public trails, or landscaping material to be considered a permeable surface that were not included in the approved plans and specifications. g. Other modifications as determined by the Director. 9. If the stormwater system was used as an Erosion Control device, it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility. 10. Access to the stormwater facilities for inspection and maintenance shall be maintained via appropriate recorded easements at all times. 11. Prior to the construction of any permitted future areas shown on the approved plans, the permittee shall submit final site layout and grading plans to the Division for approval. 12. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made.
Post-Construction Stormwater Management Systems Permit No. SW8 980236
Page 4 of 5
III. GENERAL CONDITIONS 1. CORRECTIVE ACTIONS REQUIRED. If the facilities fail to perform satisfactorily, the permittee shall take immediate corrective actions. This includes actions required by this Division and the stormwater rules such as the construction of additional or replacement on-site stormwater systems. These additional or replacement measures shall receive a permit from the Division prior to construction. 2. PERMIT RENEWAL. A permit renewal request must be submitted at least 180 days prior to the expiration date of this permit. The renewal request must include the appropriate application, documentation and the processing fee as outlined in Title 15A NCAC 02H.1045(3). 3. CHANGES TO THE PROJECT NAME, PERMITTEE NAME OR CONTACT INFORMATION. The permittee shall submit a completed Permit Information Update Application Form to the Division within 30 days to making any one of these changes. 4. TRANSFER. This permit is not transferable to any person or entity except after notice to and approval by the Director. Neither the sale of the project and/or property, in whole or in part, nor the conveyance of common area to a third party constitutes an approved transfer of the permit. a. TRANSFER REQUEST. The transfer request must include the appropriate application, documentation and the processing fee as outlined in 15A NCAC 02H.1045(2). This request must be submitted within 90 days of the permit holder meeting one or more of the following: i. A natural person who is deceased; ii. A partnership, limited liability corporation, corporation, or any other business association that has been dissolved; iii. A person or entity who has been lawfully and finally divested of title to the property on which the permitted activity is occurring or will occur through foreclosure, bankruptcy, or other legal proceeding. iv. A person or entity who has sold the property, in whole or in part, on which the permitted activity is occurring or will occur, v. The assignment of declarant rights to another individual or entity; vi. The sale or conveyance of the common areas to a Homeowner’s or Property Owner’s Association, subject to the requirements of NCGS 143-214.7(c2); b. TRANSFER INSPECTION. Prior to transfer of the permit, a file review and site inspection will be conducted by Division personnel to ensure the permit conditions have been met and that the project and the on-site stormwater system complies with the permit conditions. Records of maintenance activities performed to date may be requested. Projects not in compliance with the permit will not be transferred until all permit and/or general statute conditions are met. 5. COMPLIANCE. The permittee is responsible for compliance with the terms and conditions of this permit until the Division approves the transfer request. a. APPROVED PLANS AND SPECIFICATIONS. A copy of this permit, approved plans, application, supplement, operation and maintenance agreement, all applicable recorded documents, and specifications shall be maintained on file by the permittee at all times. b. DIVISION ACCESS. The permittee grants Division Staff permission to enter the property during normal business hours to inspect all components of the permitted project. c. ENFORCEMENT. Any individual or entity found to be in noncompliance with the provisions of a stormwater management permit or the requirements of the stormwater rules is subject to enforcement procedures as set forth in NCGS 143 Article 21. d. ANNUAL CERTIFICATION. The permittee shall electronically submit to the Division an annual certification completed by either the permittee or their designee confirming the projects conformance with permit conditions
Post-Construction Stormwater Management Systems Permit No. SW8 980236
Page 5 of 5
e. OBTAINING COMPLIANCE. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of modified plans and certification in writing to the Director that the changes have been made. f. OTHER PERMITS. The issuance of this permit does not preclude the permittee from complying with and obtaining any other permits or approvals that are required for this development to take place, as required by any statutes, rules, regulations, or ordinances, which may be imposed by any other Local, State or Federal government agency having jurisdiction. Any activities undertaken at this site that cause a water quality violation or undertaken prior to receipt of the necessary permits or approvals to do so are considered violations of NCGS 143-215.1, and subject to enforcement procedures pursuant to NCGS 143-215.6. Permit renewed, updated, and reissued this the 2nd day of November 2022. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION ____________________________________________ For Brian Wrenn, Director Division of Energy, Mineral and Land Resources By Authority of the Environmental Management Commission
Post-Construction Stormwater Management Systems Permit No. SW8 980236
Page 1 of 2
J. Michaels Phill Deli North
Stormwater Permit No. SW8 980236 New Hanover County Designer's Certification
I, ______________________, as a duly registered _______________________ in the State of North Carolina,
having been authorized to observe (periodically/ weekly/ full time) the construction of the project,
_____________________________________________________________________
(Project)
for __________________________________(Project Owner) hereby state that, to the best of my abilities,
due care and diligence was used in the observation of the project construction such that the construction was
observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is included in the Certification. Noted deviations from approved plans and specifications: SEAL Signature ____________________________________ Registration Number __________________________ Date _________________________________________
Post-Construction Stormwater Management Systems Permit No. SW8 980236
Page 2 of 2
Certification Requirements: _____1. The drainage area to the system contains approximately the permitted acreage. _____2. The drainage area to the system contains no more than the permitted amount of built-upon area. _____3. All the built-upon area associated with the project is graded such that the runoff drains to the system. _____4. All roof drains are located such that the runoff is directed into the system. _____5. The outlet structure elevations are per the approved plan. _____6. The outlet structure is located per the approved plans. _____7. Trash rack is provided on the outlet structure. _____8. All slopes are grassed with permanent vegetation. _____9. Vegetated slopes are no steeper than 3:1. _____10. The inlets are located per the approved plans and do not cause short-circuiting of the system. _____11. The permitted amounts of surface area and/or volume have been provided. _____12. Required drawdown devices are correctly sized and located per the approved plans. _____13. All required design depths are provided. _____14. All required parts of the system are provided, such as a vegetated shelf, and a forebay. _____15. The required system dimensions are provided per the approved plans. _____16. All components of the stormwater BMP are located in either recorded common areas, or recorded easements. cc: NCDENR-DEQ Regional Office
Stormwater Conveyance Summary
DO
N
O
T
E
N
T
E
R
DO
N
O
T
E
N
T
E
R
IN-1
MH-1
EX-DI
IN-2
MH-2 IN-3
IN-5
IN-6
IN-8
IN-10
IN-12
YB-1
IN-11IN-9
IN-7
CO-1
CO-2
CO-3
CO-4
IN-4
PR
O
P
.
R
O
O
F
D
R
A
I
N
S
Project Description
REV 0 - 25yr.SPF
Project Options
CFS
Elevation
Rational
User-Defined
Kinematic Wave
YES
NO
Analysis Options
Mar 15, 2023 00:00:00
Mar 16, 2023 00:00:00
Mar 15, 2023 00:00:00
0 days
0 01:00:00 days hh:mm:ss
0 00:05:00 days hh:mm:ss
0 00:05:00 days hh:mm:ss
30 seconds
Number of Elements
Qty
0
17
21
6
0
0
15
0
20
0
20
0
0
0
0
0
0
Rainfall Details
25 year(s)
Outlets .......................................................................
Pollutants ...........................................................................
Land Uses ..........................................................................
Return Period......................................................................
Links....................................................................................
Channels ...................................................................
Pipes .........................................................................
Pumps .......................................................................
Orifices ......................................................................
Weirs .........................................................................
Nodes..................................................................................
Junctions ...................................................................
Outfalls ......................................................................
Flow Diversions .........................................................
Inlets ..........................................................................
Storage Nodes ..........................................................
Runoff (Dry Weather) Time Step .......................................
Runoff (Wet Weather) Time Step ......................................
Reporting Time Step ..........................................................
Routing Time Step .............................................................
Rain Gages ........................................................................
Subbasins...........................................................................
Enable Overflow Ponding at Nodes ...................................
Skip Steady State Analysis Time Periods ..........................
Start Analysis On ...............................................................
End Analysis On .................................................................
Start Reporting On .............................................................
Antecedent Dry Days .........................................................
File Name ...........................................................................
Flow Units ..........................................................................
Elevation Type ...................................................................
Hydrology Method ..............................................................
Time of Concentration (TOC) Method ...............................
Link Routing Method ..........................................................
Subbasin Summary
SN Subbasin Area Weighted Total Total Total Peak Time of
ID Runoff Rainfall Runoff Runoff Runoff Concentration
Coefficient Volume
(ac)(in)(in)(ac-in)(cfs)(days hh:mm:ss)
1 DA-CO-1 0.03 0.9500 0.69 0.65 0.02 0.24 0 00:05:00
2 DA-CO-2 0.04 0.9500 0.69 0.65 0.03 0.31 0 00:05:00
3 DA-CO-3 0.03 0.9500 0.69 0.65 0.02 0.24 0 00:05:00
4 DA-EX-DI 0.01 0.9500 0.69 0.65 0.01 0.11 0 00:05:00
5 DA-IN-1 0.02 0.9500 0.69 0.65 0.02 0.18 0 00:05:00
6 DA-IN-10 0.04 0.7900 0.69 0.54 0.02 0.26 0 00:05:00
7 DA-IN-11 0.12 0.9000 0.69 0.62 0.07 0.89 0 00:05:00
8 DA-IN-12 0.08 0.5400 0.69 0.37 0.03 0.36 0 00:05:00
9 DA-IN-2 0.04 0.9500 0.69 0.65 0.03 0.31 0 00:05:00
10 DA-IN-3 0.05 0.8200 0.69 0.56 0.03 0.34 0 00:05:00
11 DA-IN-4 0.02 0.9500 0.69 0.65 0.01 0.16 0 00:05:00
12 DA-IN-5 0.12 0.9000 0.69 0.62 0.07 0.89 0 00:05:00
13 DA-IN-6 0.06 0.6300 0.69 0.43 0.03 0.31 0 00:05:00
14 DA-IN-7 0.09 0.9400 0.69 0.65 0.06 0.70 0 00:05:00
15 DA-IN-8 0.06 0.7300 0.69 0.50 0.03 0.36 0 00:05:00
16 DA-IN-9 0.10 0.9300 0.69 0.64 0.06 0.77 0 00:05:00
17 DA-YB-1 0.07 0.3500 0.69 0.24 0.02 0.20 0 00:05:00
Node Summary
SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total Total Time
ID Type Elevation (Max)Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded Flooded
Elevation Elevation Attained Depth Attained Flooding Volume
Attained Occurrence
(ft)(ft)(ft)(ft)(ft²)(cfs)(ft)(ft)(ft)(days hh:mm)(ac-in)(min)
1 CO-1 Junction 42.33 44.13 0.00 0.00 0.00 0.24 42.55 0.00 1.58 0 00:00 0.00 0.00
2 CO-2 Junction 42.05 43.34 0.00 0.00 0.00 0.54 42.37 0.00 0.97 0 00:00 0.00 0.00
3 CO-3 Junction 41.48 42.67 0.00 0.00 0.00 0.76 41.86 0.00 0.81 0 00:00 0.00 0.00
4 CO-4 Junction 41.05 42.24 0.00 0.00 0.00 0.76 41.49 0.00 0.75 0 00:00 0.00 0.00
5 MH-1 Junction 39.67 45.43 0.00 0.00 0.00 0.17 39.87 0.00 5.56 0 00:00 0.00 0.00
6 MH-2 Junction 40.96 45.44 0.00 0.00 0.00 0.30 45.44 0.00 0.00 0 00:00 0.00 0.00
Link Summary
SN Element Element From To (Outlet)Length Inlet Outlet Average Diameter or Manning's Peak Design Flow Peak Flow/Peak Flow Peak Flow Peak Flow Total Time Reported
ID Type (Inlet)Node Invert Invert Slope Height Roughness Flow Capacity Design Flow Velocity Depth Depth/Surcharged Condition
Node Elevation Elevation Ratio Total Depth
Ratio
(ft)(ft)(ft)(%)(in)(cfs)(cfs)(ft/sec)(ft)(min)
1 CO-1--CO-2 Pipe CO-1 CO-2 35.02 42.33 42.15 0.5100 12.000 0.0150 0.23 2.21 0.10 2.62 0.22 0.22 0.00 Calculated
2 CO-2--CO-3 Pipe CO-2 CO-3 48.78 42.05 41.58 0.9600 12.000 0.0150 0.54 3.03 0.18 2.93 0.28 0.28 0.00 Calculated
3 CO-3--CO-4 Pipe CO-3 CO-4 33.06 41.48 41.15 1.0000 12.000 0.0150 0.76 3.08 0.25 3.26 0.34 0.34 0.00 Calculated
4 CO-4--IN-3 Pipe CO-4 IN-3 57.79 41.05 40.63 0.7300 12.000 0.0150 0.75 2.63 0.29 2.92 0.37 0.37 0.00 Calculated
5 EX-DI--EX-DI-2 Pipe EX-DI EX-DI-2 137.00 39.44 36.56 2.1000 48.000 0.0150 0.28 180.50 0.00 2.74 0.12 0.03 0.00 Calculated
6 IN-10--IN-12 Pipe IN-10 IN-12 83.43 36.94 36.11 0.9900 15.000 0.0150 4.16 5.58 0.75 5.02 0.80 0.64 0.00 Calculated
7 IN-11--IN-12 Pipe IN-11 IN-12 66.42 36.77 36.11 0.9900 15.000 0.0150 0.87 5.58 0.16 4.35 0.33 0.27 0.00 Calculated
8 IN-12--YB-1 Pipe IN-12 YB-1 24.54 36.01 35.76 1.0200 15.000 0.0150 5.27 5.65 0.93 5.24 0.96 0.77 0.00 Calculated
9 IN-1--EX-DI(BYPASSED)Pipe IN-1 EX-DI 2169.26 41.00 39.44 0.0700 0.000 0.0150 0.01 0.00 0.93 0.00 0.96 0.77 0.00 Calculated
10 IN-1--MH-1 Pipe IN-1 MH-1 18.77 41.00 39.77 6.5500 15.000 0.0150 0.17 14.33 0.01 3.95 0.10 0.08 0.00 Calculated
11 IN-2--IN-4(BYPASSED)Pipe IN-2 IN-4 6300.43 41.25 40.39 0.0100 0.000 0.0150 0.02 0.00 0.01 0.00 0.10 0.08 0.00 Calculated
12 IN-2--MH-2 Pipe IN-2 MH-2 18.94 41.25 41.06 1.0000 15.000 0.0150 0.30 5.61 0.05 2.84 0.19 0.16 0.00 Calculated
13 IN-3--IN-4 Pipe IN-3 IN-4 6.51 40.53 40.49 0.6100 15.000 0.0150 1.06 4.39 0.24 2.95 0.42 0.34 0.00 Calculated
14 IN-4--IN-5 Pipe IN-4 IN-5 59.89 40.39 39.79 1.0000 15.000 0.0150 1.22 5.60 0.22 3.67 0.40 0.32 0.00 Calculated
15 IN-5--IN-6 Pipe IN-5 IN-6 17.11 39.69 39.49 1.1700 15.000 0.0150 2.05 6.05 0.34 4.45 0.50 0.40 0.00 Calculated
16 IN-6--IN-8 Pipe IN-6 IN-8 88.29 39.39 38.46 1.0500 15.000 0.0150 2.33 5.75 0.40 4.47 0.55 0.44 0.00 Calculated
17 IN-7--IN-8 Pipe IN-7 IN-8 6.36 38.41 38.36 0.7900 15.000 0.0150 0.69 4.96 0.14 2.85 0.31 0.25 0.00 Calculated
18 IN-8--IN-10 Pipe IN-8 IN-10 137.05 38.36 37.04 0.9600 15.000 0.0150 3.27 5.49 0.60 4.74 0.69 0.55 0.00 Calculated
19 IN-9--IN-10 Pipe IN-9 IN-10 9.19 37.13 37.04 0.9800 15.000 0.0150 0.76 5.54 0.14 3.17 0.31 0.25 0.00 Calculated
20 MH-1--EX-DI Pipe MH-1 EX-DI 15.10 39.67 39.54 0.8600 15.000 0.0150 0.17 5.19 0.03 1.96 0.15 0.12 0.00 Calculated
Inlet Summary
SN Element Inlet Manufacturer Inlet Number of Catchbasin Max (Rim)Initial Ponded Peak Peak Flow Peak Flow Inlet Allowable Max Gutter Max Gutter
ID Manufacturer Part Location Inlets Invert Elevation Water Area Flow Intercepted Bypassing Efficiency Spread Spread Water Elev.
Number Elevation Elevation by Inlet during Peak during Peak during Peak
Inlet Flow Flow Flow
(ft)(ft)(ft)(ft²)(cfs)(cfs)(cfs)(%)(ft)(ft)(ft)
1 EX-DI FHWA HEC-22 GENERIC N/A On Sag 1 39.44 44.83 0.00 10.00 0.11 N/A N/A N/A 7.00 2.34 44.98
2 EX-DI-2 FHWA HEC-22 GENERIC N/A On Sag 1 36.39 42.47 0.00 10.00 0.00 N/A N/A N/A 7.00 2.00 42.62
3 IN-1 FHWA HEC-22 GENERIC N/A On Grade 1 41.00 45.56 0.00 N/A 0.18 0.18 0.00 100.00 7.00 1.87 45.68
4 IN-10 FHWA HEC-22 GENERIC N/A On Sag 1 36.94 40.73 0.00 10.00 0.26 N/A N/A N/A 7.00 1.86 40.87
5 IN-11 FHWA HEC-22 GENERIC N/A On Sag 1 36.77 39.76 0.00 10.00 0.89 N/A N/A N/A 7.00 2.96 39.92
6 IN-12 FHWA HEC-22 GENERIC N/A On Sag 1 36.01 39.25 0.00 10.00 0.36 N/A N/A N/A 7.00 2.06 39.40
7 IN-2 FHWA HEC-22 GENERIC N/A On Grade 1 41.25 46.14 0.00 N/A 0.31 0.02 0.29 6.34 7.00 2.30 46.19
8 IN-3 FHWA HEC-22 GENERIC N/A On Sag 1 40.53 43.38 0.00 10.00 0.34 N/A N/A N/A 7.00 2.03 43.53
9 IN-4 FHWA HEC-22 GENERIC N/A On Sag 1 40.39 43.58 0.00 10.00 0.16 N/A N/A N/A 7.00 1.61 43.72
10 IN-5 FHWA HEC-22 GENERIC N/A On Sag 1 39.69 43.81 0.00 10.00 0.89 N/A N/A N/A 7.00 2.96 43.97
11 IN-6 FHWA HEC-22 GENERIC N/A On Sag 1 39.39 43.41 0.00 10.00 0.31 N/A N/A N/A 7.00 1.97 43.55
12 IN-7 FHWA HEC-22 GENERIC N/A On Sag 1 38.41 44.07 0.00 10.00 0.70 N/A N/A N/A 7.00 2.67 44.23
13 IN-8 FHWA HEC-22 GENERIC N/A On Sag 1 38.36 42.39 0.00 10.00 0.36 N/A N/A N/A 7.00 2.07 42.54
14 IN-9 FHWA HEC-22 GENERIC N/A On Sag 1 37.13 43.65 0.00 10.00 0.77 N/A N/A N/A 7.00 2.77 43.81
15 YB-1 FHWA HEC-22 GENERIC N/A On Sag 1 34.95 40.43 0.00 10.00 0.20 N/A N/A N/A 7.00 1.73 40.57
Junction Input
SN Element Invert Ground/Rim Ground/Rim Initial Initial Surcharge Surcharge Ponded Minimum
ID Elevation (Max)(Max)Water Water Elevation Depth Area Pipe
Elevation Offset Elevation Depth Cover
(ft)(ft)(ft)(ft)(ft)(ft)(ft)(ft²)(in)
1 CO-1 42.33 44.13 1.80 0.00 -42.33 0.00 -44.13 0.00 0.00
2 CO-2 42.05 43.34 1.29 0.00 -42.05 0.00 -43.34 0.00 0.00
3 CO-3 41.48 42.67 1.19 0.00 -41.48 0.00 -42.67 0.00 0.00
4 CO-4 41.05 42.24 1.19 0.00 -41.05 0.00 -42.24 0.00 0.00
5 MH-1 39.67 45.43 5.76 0.00 -39.67 0.00 -45.43 0.00 0.00
6 MH-2 40.96 45.44 4.48 0.00 -40.96 0.00 -45.44 0.00 0.00
Junction Results
SN Element Peak Peak Max HGL Max HGL Max Min Average HGL Average HGL Time of Time of Total Total Time
ID Inflow Lateral Elevation Depth Surcharge Freeboard Elevation Depth Max HGL Peak Flooded Flooded
Inflow Attained Attained Depth Attained Attained Attained Occurrence Flooding Volume
Attained Occurrence
(cfs)(cfs)(ft)(ft)(ft)(ft)(ft)(ft)(days hh:mm)(days hh:mm)(ac-in)(min)
1 CO-1 0.24 0.24 42.55 0.22 0.00 1.58 42.33 0.00 0 00:05 0 00:00 0.00 0.00
2 CO-2 0.54 0.31 42.37 0.32 0.00 0.97 42.15 0.10 0 00:05 0 00:00 0.00 0.00
3 CO-3 0.76 0.24 41.86 0.38 0.00 0.81 41.58 0.10 0 00:05 0 00:00 0.00 0.00
4 CO-4 0.76 0.00 41.49 0.44 0.00 0.75 41.15 0.10 0 00:05 0 00:00 0.00 0.00
5 MH-1 0.17 0.00 39.87 0.20 0.00 5.56 39.77 0.10 0 00:05 0 00:00 0.00 0.00
6 MH-2 0.30 0.00 45.44 4.48 0.00 0.00 41.09 0.13 0 00:00 0 00:00 0.00 0.00
Pipe Input
SN Element Length Inlet Inlet Outlet Outlet Total Average Pipe Pipe Pipe Manning's Entrance Exit/Bend Additional
ID Invert Invert Invert Invert Drop Slope Shape Diameter or Width Roughness Losses Losses Losses
Elevation Offset Elevation Offset Height
(ft)(ft)(ft)(ft)(ft)(ft)(%)(in)(in)
1 CO-1--CO-2 35.02 42.33 0.00 42.15 0.10 0.18 0.5100 CIRCULAR 12.000 12.000 0.0150 0.5000 0.5000 0.0000
2 CO-2--CO-3 48.78 42.05 0.00 41.58 0.10 0.47 0.9600 CIRCULAR 12.000 12.000 0.0150 0.5000 0.5000 0.0000
3 CO-3--CO-4 33.06 41.48 0.00 41.15 0.10 0.33 1.0000 CIRCULAR 12.000 12.000 0.0150 0.5000 0.5000 0.0000
4 CO-4--IN-3 57.79 41.05 0.00 40.63 0.10 0.42 0.7300 CIRCULAR 12.000 12.000 0.0150 0.5000 0.5000 0.0000
5 EX-DI--EX-DI-2 137.00 39.44 0.00 36.56 0.17 2.88 2.1000 CIRCULAR 48.000 48.000 0.0150 0.5000 0.5000 0.0000
6 IN-10--IN-12 83.43 36.94 0.00 36.11 0.10 0.83 0.9900 CIRCULAR 15.000 15.000 0.0150 0.5000 0.5000 0.0000
7 IN-11--IN-12 66.42 36.77 0.00 36.11 0.10 0.66 0.9900 CIRCULAR 15.000 15.000 0.0150 0.5000 0.5000 0.0000
8 IN-12--YB-1 24.54 36.01 0.00 35.76 0.81 0.25 1.0200 CIRCULAR 15.000 15.000 0.0150 0.5000 0.5000 0.0000
9 IN-1--EX-DI(BYPASSED)2169.26 41.00 0.00 39.44 0.00 1.56 0.0700 Dummy 0.000 0.000 0.0150 0.5000 0.5000 0.0000
10 IN-1--MH-1 18.77 41.00 0.00 39.77 0.10 1.23 6.5500 CIRCULAR 15.000 15.000 0.0150 0.5000 0.5000 0.0000
11 IN-2--IN-4(BYPASSED)6300.43 41.25 0.00 40.39 0.00 0.86 0.0100 Dummy 0.000 0.000 0.0150 0.5000 0.5000 0.0000
12 IN-2--MH-2 18.94 41.25 0.00 41.06 0.10 0.19 1.0000 CIRCULAR 15.000 15.000 0.0150 0.5000 0.5000 0.0000
13 IN-3--IN-4 6.51 40.53 0.00 40.49 0.10 0.04 0.6100 CIRCULAR 15.000 15.000 0.0150 0.5000 0.5000 0.0000
14 IN-4--IN-5 59.89 40.39 0.00 39.79 0.10 0.60 1.0000 CIRCULAR 15.000 15.000 0.0150 0.5000 0.5000 0.0000
15 IN-5--IN-6 17.11 39.69 0.00 39.49 0.10 0.20 1.1700 CIRCULAR 15.000 15.000 0.0150 0.5000 0.5000 0.0000
16 IN-6--IN-8 88.29 39.39 0.00 38.46 0.10 0.93 1.0500 CIRCULAR 15.000 15.000 0.0150 0.5000 0.5000 0.0000
17 IN-7--IN-8 6.36 38.41 0.00 38.36 0.00 0.05 0.7900 CIRCULAR 15.000 15.000 0.0150 0.5000 0.5000 0.0000
18 IN-8--IN-10 137.05 38.36 0.00 37.04 0.10 1.32 0.9600 CIRCULAR 15.000 15.000 0.0150 0.5000 0.5000 0.0000
19 IN-9--IN-10 9.19 37.13 0.00 37.04 0.10 0.09 0.9800 CIRCULAR 15.000 15.000 0.0150 0.5000 0.5000 0.0000
20 MH-1--EX-DI 15.10 39.67 0.00 39.54 0.10 0.13 0.8600 CIRCULAR 15.000 15.000 0.0150 0.5000 0.5000 0.0000
Pipe Results
SN Element Peak Time of Design Flow Peak Flow/Peak Flow Travel Peak Flow Peak Flow Total Time Froude Reported
ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/Surcharged Number Condition
Occurrence Ratio Total Depth
Ratio
(cfs)(days hh:mm)(cfs)(ft/sec)(min)(ft)(min)
1 CO-1--CO-2 0.23 0 00:05 2.21 0.10 2.62 0.22 0.22 0.22 0.00 Calculated
2 CO-2--CO-3 0.54 0 00:05 3.03 0.18 2.93 0.28 0.28 0.28 0.00 Calculated
3 CO-3--CO-4 0.76 0 00:05 3.08 0.25 3.26 0.17 0.34 0.34 0.00 Calculated
4 CO-4--IN-3 0.75 0 00:05 2.63 0.29 2.92 0.33 0.37 0.37 0.00 Calculated
5 EX-DI--EX-DI-2 0.28 0 00:05 180.50 0.00 2.74 0.83 0.12 0.03 0.00 Calculated
6 IN-10--IN-12 4.16 0 00:06 5.58 0.75 5.02 0.28 0.80 0.64 0.00 Calculated
7 IN-11--IN-12 0.87 0 00:05 5.58 0.16 4.35 0.25 0.33 0.27 0.00 Calculated
8 IN-12--YB-1 5.27 0 00:05 5.65 0.93 5.24 0.08 0.96 0.77 0.00 Calculated
9 IN-1--EX-DI(BYPASSED)0.01 0 00:05 0.00 0.93 0.00 0.96 0.77 0.00 Calculated
10 IN-1--MH-1 0.17 0 00:05 14.33 0.01 3.95 0.08 0.10 0.08 0.00 Calculated
11 IN-2--IN-4(BYPASSED)0.02 0 00:05 0.00 0.01 0.00 0.10 0.08 0.00 Calculated
12 IN-2--MH-2 0.30 0 00:05 5.61 0.05 2.84 0.11 0.19 0.16 0.00 Calculated
13 IN-3--IN-4 1.06 0 00:05 4.39 0.24 2.95 0.04 0.42 0.34 0.00 Calculated
14 IN-4--IN-5 1.22 0 00:05 5.60 0.22 3.67 0.27 0.40 0.32 0.00 Calculated
15 IN-5--IN-6 2.05 0 00:05 6.05 0.34 4.45 0.06 0.50 0.40 0.00 Calculated
16 IN-6--IN-8 2.33 0 00:05 5.75 0.40 4.47 0.33 0.55 0.44 0.00 Calculated
17 IN-7--IN-8 0.69 0 00:05 4.96 0.14 2.85 0.04 0.31 0.25 0.00 Calculated
18 IN-8--IN-10 3.27 0 00:05 5.49 0.60 4.74 0.48 0.69 0.55 0.00 Calculated
19 IN-9--IN-10 0.76 0 00:05 5.54 0.14 3.17 0.05 0.31 0.25 0.00 Calculated
20 MH-1--EX-DI 0.17 0 00:05 5.19 0.03 1.96 0.13 0.15 0.12 0.00 Calculated
Inlet Input
SN Element Inlet Manufacturer Inlet Number of Catchbasin Max (Rim)Inlet Initial Initial Ponded Grate
ID Manufacturer Part Location Inlets Invert Elevation Depth Water Water Area Clogging
Number Elevation Elevation Depth Factor
(ft)(ft)(ft)(ft)(ft)(ft²)(%)
1 EX-DI FHWA HEC-22 GENERIC N/A On Sag 1 39.44 44.83 5.39 0.00 0.00 10.00 0.00
2 EX-DI-2 FHWA HEC-22 GENERIC N/A On Sag 1 36.39 42.47 6.08 0.00 0.00 10.00 0.00
3 IN-1 FHWA HEC-22 GENERIC N/A On Grade 1 41.00 45.56 4.56 0.00 0.00 N/A 0.00
4 IN-10 FHWA HEC-22 GENERIC N/A On Sag 1 36.94 40.73 3.79 0.00 0.00 10.00 0.00
5 IN-11 FHWA HEC-22 GENERIC N/A On Sag 1 36.77 39.76 2.99 0.00 0.00 10.00 0.00
6 IN-12 FHWA HEC-22 GENERIC N/A On Sag 1 36.01 39.25 3.24 0.00 0.00 10.00 0.00
7 IN-2 FHWA HEC-22 GENERIC N/A On Grade 1 41.25 46.14 4.89 0.00 0.00 N/A 0.00
8 IN-3 FHWA HEC-22 GENERIC N/A On Sag 1 40.53 43.38 2.85 0.00 0.00 10.00 0.00
9 IN-4 FHWA HEC-22 GENERIC N/A On Sag 1 40.39 43.58 3.19 0.00 0.00 10.00 0.00
10 IN-5 FHWA HEC-22 GENERIC N/A On Sag 1 39.69 43.81 4.12 0.00 0.00 10.00 0.00
11 IN-6 FHWA HEC-22 GENERIC N/A On Sag 1 39.39 43.41 4.02 0.00 0.00 10.00 0.00
12 IN-7 FHWA HEC-22 GENERIC N/A On Sag 1 38.41 44.07 5.66 0.00 0.00 10.00 0.00
13 IN-8 FHWA HEC-22 GENERIC N/A On Sag 1 38.36 42.39 4.03 0.00 0.00 10.00 0.00
14 IN-9 FHWA HEC-22 GENERIC N/A On Sag 1 37.13 43.65 6.52 0.00 0.00 10.00 0.00
15 YB-1 FHWA HEC-22 GENERIC N/A On Sag 1 34.95 40.43 5.48 0.00 0.00 10.00 0.00
Inlet Results
SN Element Peak Peak Peak Flow Peak Flow Inlet Max Gutter Max Gutter Max Gutter Time of Total Total Time
ID Flow Lateral Intercepted Bypassing Efficiency Spread Water Elev.Water Depth Max Depth Flooded Flooded
Inflow by Inlet during Peak during Peak during Peak during Peak Occurrence Volume
Inlet Flow Flow Flow Flow
(cfs)(cfs)(cfs)(cfs)(%)(ft)(ft)(ft)(days hh:mm)(ac-in)(min)
1 EX-DI 0.11 0.11 N/A N/A N/A 2.34 44.98 0.15 0 00:05 0.00 0.00
2 EX-DI-2 0.00 0.00 N/A N/A N/A 2.00 42.62 0.15 0 00:05 0.00 0.00
3 IN-1 0.18 0.18 0.18 0.00 100.00 1.87 45.68 0.12 0 00:05 0.00 0.00
4 IN-10 0.26 0.26 N/A N/A N/A 1.86 40.87 0.14 0 00:05 0.00 0.00
5 IN-11 0.89 0.89 N/A N/A N/A 2.96 39.92 0.16 0 00:05 0.00 0.00
6 IN-12 0.36 0.36 N/A N/A N/A 2.06 39.40 0.15 0 00:05 0.00 0.00
7 IN-2 0.31 0.31 0.02 0.29 6.34 2.30 46.19 0.05 0 00:05 0.00 0.00
8 IN-3 0.34 0.34 N/A N/A N/A 2.03 43.53 0.15 0 00:05 0.00 0.00
9 IN-4 0.16 0.16 N/A N/A N/A 1.61 43.72 0.14 0 00:05 0.00 0.00
10 IN-5 0.89 0.89 N/A N/A N/A 2.96 43.97 0.16 0 00:05 0.00 0.00
11 IN-6 0.31 0.31 N/A N/A N/A 1.97 43.55 0.14 0 00:05 0.00 0.00
12 IN-7 0.70 0.70 N/A N/A N/A 2.67 44.23 0.16 0 00:05 0.00 0.00
13 IN-8 0.36 0.36 N/A N/A N/A 2.07 42.54 0.15 0 00:05 0.00 0.00
14 IN-9 0.77 0.77 N/A N/A N/A 2.77 43.81 0.16 0 00:05 0.00 0.00
15 YB-1 0.20 0.20 N/A N/A N/A 1.73 40.57 0.14 0 00:05 0.00 0.00
Drainage Area Plans
Sign
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24 OAK (DBL)
18 OAK (DBL)
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12 OAK
8 OAK
8 OAK
12 CMYRTLE
12 CMYRTLE
9 OAK
8 OAK
8 OAK
8 OAK
8 OAK 9 OAK
7 LIVE OAK
7 LIVE OAK
12 LIVE OAK8 LIVE OAK12 LIVE OAK
12 LIVE OAK
8 LIVE OAK
24 CMYRTLE
10 CMYRTLE
12 OAK
7 LIVE OAK9 LIVE OAK
8 OAK8 OAK
12 OAK
9 OAK 24 OAK (DBL)
15 LIVE OAK
8 CMYRTLE
BUILDING HEIGHT
66.62'
BUILDING HEIGHT
71.90'
12 LIVE OAK
10 OAK
8 LIVE OAK
CMYRTLE
CMYRTLE
8 PINE
8 PINE
DBL OAK 18
10 CMYRTLE8 CMYRTLE
12 JAP MAPLE LP TANK
TBM A
ELEV= 45.17
TBM B
ELEV= 39.77
GREASE
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UTILITY EASEMENT; BK5255 PG445
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AS SHOWN
DTR
01/18/2022
ESM
SHEET
APPROVED BY
OF20 22
DRAWN BY
DRAWING SCALE
DATE
PROJECT
ALL DOCUMENTS PREPARED BY PENNONI ASSOCIATES
ARE INSTRUMENTS OF SERVICE IN RESPECT OF THE
PROJECT. THEY ARE NOT INTENDED OR REPRESENTED
TO BE SUITABLE FOR REUSE BY OWNER OR OTHERS ON
THE EXTENSIONS OF THE PROJECT OR ON ANY OTHER
PROJECT. ANY REUSE WITHOUT WRITTEN VERIFICATION
OR ADAPTATION BY PENNONI ASSOCIATES FOR THE
SPECIFIC PURPOSE INTENDED WILL BE AT OWNERS
SOLE RISK AND WITHOUT LIABILITY OR LEGAL
EXPOSURE TO PENNONI ASSOCIATES; AND OWNER
SHALL INDEMNIFY AND HOLD HARMLESS PENNONI
ASSOCIATES FROM ALL CLAIMS, DAMAGES, LOSSES AND
EXPENSES ARISING OUT OF OR RESULTING THEREFROM.
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1
1
44
0
S
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H
C
H
U
R
C
H
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T
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E
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T
,
S
U
I
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E
7
0
0
CH
A
R
L
O
T
T
E
,
N
C
2
8
2
0
2
DR
I
V
E
N
B
R
A
N
D
S
PR
E
/
P
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P
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I
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A
R
E
A
TOTAL AREA: 65,575.35 SF (1.51 AC.)
IMPERVIOUS AREA: 38,345.56 SF (0.88 AC.)
PERVIOUS AREA: 27,229.79 SF (0.63 AC.)
PRE-DEVELOPMENT IMPERVIOUS AREA PLAN
POST DEVELOPMENT IMPERVIOUS AREA PLAN
TOTAL AREA: 65,575.35 SF (1.51 AC)
IMPERVIOUS AREA: 25,775.84 SF (0.59 AC)
PERVIOUS AREA: 39,799.51 SF (0.92 AC)
3'R
3'R
10'R
10'R
10'R
15'R
10'R
10
'R20'R
20'R
TAKE 5 CAR WASH
EXPRESS 110' TUNNEL
50'R
10'R
3'
R
2 4'R
2 5 'R
5'
R
5'R
1
0'R
3 'R
24'R
10'R
8'R
3'R
10'R
5'R
5'R
5'R
PROP. PROPERTY LINE
(1.51 AC)
DO NOT
E
N
T
E
R
DO NOT ENTER
2'R
10'R
IN-1
MH-1
EX-DI
IN-2
MH-2
IN-3
IN-5
IN-6
IN-8
IN-10
IN-12
YB-1
IN-11
IN-9
IN-7
CO-1CO-2CO-3CO-4
IN-4
PROP. ROOF DRAINS
4
5
46
40
41 41
4
1
42
4
3
42
43
44
45
4
24
3
44
45
44
44
41
44
46
41
4
4
44
44
43
42
42
43
41
4243
45
46
45
41
42
47
45
40
40
45
45
Ove
r
h
e
a
d
P
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w
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r
GM
CO
CO
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T
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H
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#
1
7
B
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S
10
0
'
R
/
W
8 LIVE OAK
8 PINE
8 PINE
DBL OAK 18
15" CMP
DI
RIM= 45.63
INV (NW)= 39.59
INV (N)= 41.59
INV (SE)= 39.44
INV (S)= 41.45
48" C
M
P
48" CM
P
DI
RIM= 42.47
INV (NW)= 36.56
INV (SE)= 36.39
MH
RIM= 46.93
INV= 40.11
48" CMP
15"
C
M
P
INV= 34.61
RIM= 34.04
INV=31.84 INV= 31.63
INV= 32.59
4
8
"
C
M
P
E
O
I
CI
RIM= 38.18
STRUCTURE
FULL, CANNOT
SEE PIPE
SSMH
RIM= 47.29
INV (IN)= 29.09
INV (OUT)= 28.39
10
"
D
I
P
EO
I
GREASE
TRAP
CI
RIM= 45.73
INV= 41.87
1
5
"
C
P
P
CI
RIM
=
3
9
.
1
0
INV
(
N
W
)
=
3
4
.
7
3
INV
(
N
E
)
=
3
4
.
6
8
48
"
R
C
P
E
O
I
48" CMP
T
O
P
O
F
B
A
N
K
TO
P
O
F
B
A
N
K
B
O
T
T
O
M
O
F
B
A
N
K
BOTTOM
OF BANK
TOP OF BANK
BOTTOM OF BANK
EVIRF
EVIPF
EVIRF
EVIPF
10' WIDE WATER AND SEWER
UTILITY EASEMENT; BK5255 PG445
30.00
2
0
.
0
0
APPROXIMATE DUKE ENERGY PROGRESS
EASEMENTS PER DB6096; PG1312
DRAINAGE TO: CO-1
DRAINAGE AREA: 0.03 AC
IMPERVIOUS: 0.03 AC
PERVIOUS: 0.00 AC
DRAINAGE TO: CO-2
DRAINAGE AREA: 0.04 AC
IMPERVIOUS: 0.04 AC
PERVIOUS: 0.00 AC
DRAINAGE TO: CO-3
DRAINAGE AREA: 0.03 AC
IMPERVIOUS: 0.03 AC
PERVIOUS: 0.00 AC
DRAINAGE TO: IN-3
DRAINAGE AREA: 0.05 AC
IMPERVIOUS: 0.04 AC
PERVIOUS: 0.01 AC
DRAINAGE TO: IN-4
DRAINAGE AREA: 0.02 AC
IMPERVIOUS: 0.02 AC
PERVIOUS: 0.00 AC
DRAINAGE TO: IN-5
DRAINAGE AREA: 0.12 AC
IMPERVIOUS: 0.11 AC
PERVIOUS: 0.01 AC
DRAINAGE TO: IN-6
DRAINAGE AREA: 0.06 AC
IMPERVIOUS: 0.03 AC
PERVIOUS: 0.03 AC
DRAINAGE TO: IN-7
DRAINAGE AREA: 0.09 AC
IMPERVIOUS: 0.088 AC
PERVIOUS: 0.002 AC
DRAINAGE TO: IN-8
DRAINAGE AREA: 0.06 AC
IMPERVIOUS: 0.04 AC
PERVIOUS: 0.02 AC
DRAINAGE TO: IN-9
DRAINAGE AREA: 0.10 AC
IMPERVIOUS: 0.097 AC
PERVIOUS: 0.003 AC
DRAINAGE TO: IN-10
DRAINAGE AREA: 0.04 AC
IMPERVIOUS: 0.03 AC
PERVIOUS: 0.01 AC
DRAINAGE TO: IN-11
DRAINAGE AREA: 0.12 AC
IMPERVIOUS: 0.114 AC
PERVIOUS: 0.006 AC
DRAINAGE TO: IN-12
DRAINAGE AREA: 0.08 AC
IMPERVIOUS: 0.03 AC
PERVIOUS: 0.05 AC
DRAINAGE TO: YB-1
DRAINAGE AREA: 0.07 AC
IMPERVIOUS: 0.00 AC
PERVIOUS: 0.07 AC
U:
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:
--
-
-
NOT FOR CONSTRUCTION CS9202
BY
NO
.
DA
T
E
RE
V
I
S
I
O
N
S
DRVBR22040
AS SHOWN
DTR
01/18/2022
ESM
SHEET
APPROVED BY
OF21 22
DRAWN BY
DRAWING SCALE
DATE
PROJECT
ALL DOCUMENTS PREPARED BY PENNONI ASSOCIATES
ARE INSTRUMENTS OF SERVICE IN RESPECT OF THE
PROJECT. THEY ARE NOT INTENDED OR REPRESENTED
TO BE SUITABLE FOR REUSE BY OWNER OR OTHERS ON
THE EXTENSIONS OF THE PROJECT OR ON ANY OTHER
PROJECT. ANY REUSE WITHOUT WRITTEN VERIFICATION
OR ADAPTATION BY PENNONI ASSOCIATES FOR THE
SPECIFIC PURPOSE INTENDED WILL BE AT OWNERS
SOLE RISK AND WITHOUT LIABILITY OR LEGAL
EXPOSURE TO PENNONI ASSOCIATES; AND OWNER
SHALL INDEMNIFY AND HOLD HARMLESS PENNONI
ASSOCIATES FROM ALL CLAIMS, DAMAGES, LOSSES AND
EXPENSES ARISING OUT OF OR RESULTING THEREFROM.
AL
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PE
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