SW7110105_CURRENT PERMIT_20201103 (2)

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
DOC TYPE
CURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
�QJanO
YYYYM M D D

WAf,'o
ROY COOPER
co„ernor
MICHAEL S. REGAN
Sectetary
BRIAN WRENN
Director
Croatan Church of Christ
Attention: Mr. Peter Povich
3446 Old Airport Road
New Bern, NC 28562
NORTH CAROLINA
Environmental Quality
November 3, 2020
Treasurer
Subject: Stormwater Permit No. SW7110105 Renewal
Croatan Church of Christ
High Density Project
Craven County
Dear Mr. Povich:
The Washington Regional Office received a Stormwater Management Permit
Application for renewal of the subject permit on October 7, 2020. Staff review of the
application has determined that the permit can be reissued. We are forwarding Permit
No. SW7110105 dated November 3, 2020, for the continued operation of the subject
project.
This permit, upon its effective date, will replace all previous State Stormwater permits for
this project. This permit shall be effective from February 22, 2021 until February 21, 2029
and shall be subject to the conditions and limitations as specified therein, and does not
supercede any other agency permit that may be required. Please pay special attention to
the Operation and Maintenance requirements in this permit. Failure to establish an
adequate system for operation and maintenance of the stormwater management system
will result in future compliance problems.
If any parts, requirements, or limitations contained in this permit are unacceptable, you
have the right to request an adjudicatory hearing upon written request within thirty (30)
days following receipt of this permit. This request must be in the form of a written petition,
conforming to Chapter 150E of the North Carolina General Statutes, and filed with the
Office of Administrative Hearings, 6714 Mail Service Center, Raleigh, NC 27699-6714.
Unless such demands are made this permit shall be final and binding.
If you have any questions, or need additional information concerning this matter, please
contact me at [phone].
Sincerely,
Roger K. Thorpe
Environmental Engineer
IrTih �Mm QVF;*�HorthCa,ollna Deparnnen[of [nvinannental Quality I Division of Encryy. Miner al and Lind C esourres
_ Washington Regional Office, 42Washington5quore Niall_`Na fiington.Va;th Carollni-r85U
ow�au ww� 2529-16.o-I8I

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF ENERGY, MINERAL, AND LAND RESOURCES
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY 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
Croatan Church of Christ
Located at 4115 Old Cherry Point Road, New Bern, NC
Craven County
FOR THE
construction, operation and maintenance of a wet detention pond in compliance with the
provisions of 15A,NCAC 2H .1000 (hereafter referred to as the "stormwater rules') and
the approved stormwater management plans and specifications and other supporting
data as attached and on file with and approved by the Division of Energy, Mineral, and
Land Resources (Division) and considered a part of this permit.
This permit shall be effective from February 22, 2021 until February 22, 2029, and shall
be subject to the following specified conditions and limitations:
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 1.7 of this permit. The stormwater control has been
designed to handle the runoff from 42,000 square feet of impervious area.
3. The tract will be limited to the amount of built -upon area indicated in Section 1.7
of this permit, and per approved plans.
4. 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.

5. The runoff from all built -upon area within the permitted drainage area of this
project must be directed into the permitted stormwater control system.
The built -upon areas associated with this project shall be located at least 50 feet
landward of all perennial and intermittent surface waters.
The following design criteria have been provided in the wet detention pond and
must be maintained at design condition:
a.
Drainage Area, ft2:
75,326
b.
Total Impervious Surfaces, ft2:
Design
42,000
C.
Storm, inches:
1.5
d.
Pond Depth - average, feet:
3.5
e.
TSS removal efficiency:
90%
f.
Permanent Pool Elevation, FMSL:
24.50
g.
Permanent Pool Surface Area required, ft2:
4,218
h.
Permanent Pool Surface Area, ft2:
4,234
i.
Min. Volume required, ft3:
5,179
j.
Permitted Storage Volume, ft3:
5,567
k.
Temporary Storage Elevation, FMSL:
25.50
I.
Controlling Orifice:
1.25"0 pipe
M.
Permitted Forebay Volume, ft3:
1,962
n.
Receiving Stream/River Basin:
UT to Neuse River
o.
Stream Index Number:
27-(104)
P.
Classification of Water Body:
"SB;Sw;NSW'
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 time provide the operation and maintenance necessary
to assure the permitted stormwater system functions at optimum efficiency. The
approved Operation and Maintenance Plan must be followed in its entirety and
maintenance must occur at the scheduled intervals including, but not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and re -vegetation of slopes and the vegetated filter strip.
d. Immediate repair of eroded areas.
e. Maintenance of all slopes in accordance with approved plans and
specifications.
f. Debris removal and unclogging of outlet structure, orifice device, level
spreader, filter strip, catch basins and piping.
g. Access to the outlet structure must be available at all times.

4. Records of maintenance activities must be kept for each permitted SCM. The
records will indicate the date, activity, name of person performing the work and
what actions were taken.
5. The permittee shall submit to the Division an annual summary report of the
maintenance inspection records for each SCM. The report shall summarize the
inspection dates, results of the inspections, and the maintenance work performed
at each inspection.
6. Access to the stormwater facilities shall be maintained via appropriate
easements at all times.
7. The facilities shall be constructed as shown on the approved plans. This permit
shall become void unless the facilities are constructed in accordance with the
conditions of this permit, the approved plans and specifications, and other
supporting data.
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.
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. The permittee shall submit to the Director and shall have received approval for
revised plans, specifications, and calculations prior to construction, for any
modification to the approved plans, including, but not limited to, those listed
below:
a. Any revision to any item shown on the approved plans, including the
stormwater management measures, built -upon area, details, etc.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area or to the
drainage area.
e. Further subdivision, acquisition, lease or sale of all or part of the project
area. The project area is defined as all property owned by the permittee,
for which Sedimentation and Erosion Control Plan approval or a CAMA
Major permit was sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the
approved plan.
11. 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.

12. The permittee shall submit final site layout and grading plans for any permitted
future areas shown on the approved plans, prior to construction.
13. A copy of the approved plans and specifications shall be maintained on file by
the Permittee at all times.
III. GENERAL CONDITIONS
This permit is not transferable except after notice to and approval by the Director.
In the event of a change of ownership, or a name change, the permittee must
submit a completed Name/Ownership Change form, to the Division, signed by
both parties, and accompanied by supporting documentation as listed on page 2
of the form. The project must be in good standing with the Division. The approval
of this request will be considered on its merits and may or may not be approved.
2. The permittee is responsible for compliance with all permit conditions until such
time as the Division approves the transfer request.
3. Failure to abide by the conditions and limitations contained in this permit may
subject the Permittee to enforcement action by the Division, in accordance with
North Carolina General Statute 143-215.6A to 143-215.6C.
4. The issuance of this permit does not preclude the Permittee from complying with
any and all statutes, rules, regulations, or ordinances, which may be imposed by
other government agencies (local, state, and federal) having jurisdiction.
5. In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall take immediate corrective action,
including those as may be required by this Division, such as the construction of
additional or replacement stormwater management systems.
6. The permittee grants DEQ Staff permission to enter the property during normal
business hours for the purpose of inspecting all components of the permitted
stormwater management facility.
7. The permit issued shall continue in force and effect until revoked or terminated.
The permit may be modified, revoked and reissued or terminated for cause. The
filing of a request for a permit modification, revocation and re -issuance or
termination does not stay any permit condition.
8. Unless specified elsewhere, permanent seeding requirements for the stormwater
control must follow the guidelines established in the North Carolina Erosion and
Sediment Control Planning and Design Manual.
9. Approved plans and specifications for this project are incorporated by reference
and are enforceable parts of the permit.
10. 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
as allowed by the laws, rules and regulations contained in Title 15A NCAC
21-1.1000, and NCGS 143-215.1 et.al.

11. The permittee shall notify the Division of any name, ownership or mailing address
changes at least 30 days prior to making such changes.
12. This permit shall be effective from February 22, 2021 until February 21, 2029.
Application for permit renewal shall be submitted 180 days prior to the expiration
date of this permit and must be accompanied by the processing fee.
Permit issued this the 3rd day of November 2020.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
For
Brian Wrenn, Director
Division of Energy, Mineral and Land Resources
By Authority of the Environmental Management Commission
Permit Number SW7110105

r DEMLR USE ONLY
Date Received Fee Paid Permit Number
NC DEQ Division of Energy, Mineral and Land Resources
STATE STORMWATER:
PERMIT RENEWAL APPLICATION FORM
In accordance with 15A NCAC 2H.1045(3), the current permit holder shall renew their high density permit 180 days
prior to its expiration. Renewed permits are valid for a period of 8 years per Session Law 2011-398 (SB 781)
Section 60.(c). This application form is for permit renewals only.
A. PROJECT INFORMATION
1. State Stormwater Permit Number: SW7110105
2. Project name: Croatan Church of Christ
RECEIVED XT D 7 219P6
3. Project street address: 4115 Old Chem Point Rd
City: New Bern NC County: Craven —ZIP: 28562
4. What, if any, changes have been made to the project as permitted?
If the project has changed from the original approved plans, please complete SWU-101 for a Major
Modification or Minor Modification Application form available at., https://deg.nc.aov/about/divisions/enerav-
mineral-land-resources/energy-mineral-land-rules/stormwater-program/post-construction.
B. PERMITTEE INFORMATION
If changes to the permittee or project name have been made, please complete either the Permit Update form
or the Permit Transfer form available at: https'///`deq.nc.aov/about/divisions/energy-mineral-land-resources/
energy-mineral-land-rules/stormwater-program/post-construction. State Stormwater Permits do not
automatically transfer with the sale of the property.
1. Current Permit Holder's Company Name/Organization: Croatan Church of Christ
2. Signing Official's Name: Peter Povich
3. Signing Official's Title: Treasurer
4. Mailing Address: 3446 Old Airport Rd
City:
5. Street Address:
NCZIP: 28562
City: State: —ZIP:
6. Phone: [phone] Email: povich suddenlink.net
Stormwater Permit Renewal Form Page 1 of 3 May 11, 2018

Cl
... ;. '`1 - ,t'I

r
C. SUBMITTAL REQUIREMENTS
Submit the application package to the appropriate DEMLR Regional Office (Coastal, SA Waters) or DEMLR
Central Office (Urbanizing Areas Ph 2, USMP, Non -Coastal HQW/ORW). Only applications packages that
include g(( required items listed below will be accepted and reviewed.
Initial each item below to indicate that the required information is provided in the application package:
Pe 1. A permit application processing fee of $505.00 payable to NCDEQ.
2. One original signed hard copy and one electronic copy of this completed form. The signing official
named on this application to represent the current permittee must meet one of the following:
a. Corporation — a principle executive officer of at least the level of vice-president;
b. Limited Liability Company (LLC) — a manager or company official as those terms are defined
in G.S. 57D "North Carolina Limited Liability Company Act;"
c. Public Entity — a principal executive officer, ranking official, or other duly authorized employee;
d. Partnership or limited partnership — the general partner;
e. Sole proprietor; or
f. Letter of authorization signed by one of the signatories noted in a — e above authorizing the
signature of another entity.
3. One hard copy and one electronic copy of recorded documents required by the original permit that have
not yet been received by DEMLR, including: deed restrictions, protective covenants, condominium/
planned community declaration and easements. If the project has been built, include
documentation that the maximum BUA per lot or maximum total BUA has not been exceeded. If the
project has not been built, include a signed agreement that the final recorded deed restrictions and
//��jj protective covenants will be submitted at a later date.
(EF-4. O&M Agreements, Please select one:
I have a copy of the current recorded O&M Agreement for all SCMs, and I will continue to keep
this on file with the permit; or
I do not have a copy of the current recorded O&M Agreement for all SCMs and am requesting a
copy be sent to me. I agree to keep this on file with the permit.
/? 5. Designer Certifications, Please select one:
A copy of the certification(s) confirming that the project was built in accordance with the
approved plans have been previously provided to the Division; or
A copy of the certification(s) confirming that the project was built in accordance with the
approved plans are enclosed; or
The project has not yet been built.
_ 6. [IF APPLICABLE] If the project has been built, one original hard copy and one electronic copy of a
signed, sealed, and dated letter from a licensed professional stating that the SCMs have been
inspected, and that they have been built and maintained in accordance with the permit.
W-b 7. (IF APPLICABLE] When the permittee is a corporation or a limited liability corporation (LLC): Provide
one hard copy and one electronic copy of documentation from the NC Secretary of State, or other
official documentation, which supports the titles and positions held by the persons listed in Section
C.2 per 15A NCAC 2H. 1043(3)(b). hops://www.sosnc.gov/online services/search/by title/
Business Registration
Stormwater Permit Renewal Application Form Page 2 of 3 May 11, 2018

'
� 1
w

D. PERMITTEE'S CERTIFICATION
E T c %Z (bU ( C N , the person legally responsible for the permit, certify that I have a
copy of the Permit and O&M Agreement on site (or I will obtain a copy and it will be kept on site), that I am
responsible for the performance of the maintenance procedures, and the site has been and will be maintained
according to the O&M Agreement and approved plans. I agree to notify DEMLR of any problems with the SCMs
or built -upon area and to submit the proper forms to modify or transfer the permit prior to any changes to the
project, SCMs, or ownership. All information provided on this permit renewal application is, to the best of my
knowledge, corre d complete.
Signature: Date: 2D2'D
NOTARIZATION:
that _
this the
of
a Notary Public for the State of
do hereby certify
personally appeared before me
day of QGT , 20-2CL and acknowledge the due
forgoing instrument. Witness my hand and official seal,
Stormwater Permit Renewal Application Form Page 3 of 3 May 11, 2018

a `1

State Stormwater Management Systems
Permit No, SW7110105
Croatan Church of Christ
Stormwater Permit No. SW7110105
Craven County
Designer's Certification
as a duly registered ro 2 h.@orin the
State of North Carolina, having been authorized to obsery eno Ica weekly/ full
time) the construction of the project,
for ( AP-C" (fn'L-Y,4&) C_ 1s�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 specification:
Page 6 of 7
ocj fl 110
ockVIED
C-438
1983

All

Permit No. SW7110105
Certification Requirements:
✓ 1. The drainage area to the system contains approximately the permitted
acreage.
_ L. 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/bypass structure elevations are per the approved plan_
moo• The outlet structure is located per the approved plans.
7. Trash rack is provided on the outlet/bypass structure.
✓ti. All slopes are grassed with permanent vegetation.
�9. Vegetated slopes are no steeper than 3:1.
,, f0. 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.
✓ 122.. Required drawdown devices are correctly sized per the approved plans.
✓133 All required design depths are provided.
✓44. II 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.
cc: NCDENR-DWQ Washington Regional Office
Craven County Building Inspections
Page 7 of 7

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State Stormwater Management Systems
Permit No. SW7110105
Croatan Church of Christ
Stormwater Permit No. SW7110105
Craven County
Designer's Certification
I, Jv .� �,�s , as a duly registered �M�osy the
State of North Carolina, having been authorized to obsery!no wa weekly/ full
time) the construction of the project,
(Project)
for C 1ba " CLo)i�11 (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 specification:
RECEIVED SEP 3 0 2&V
\\fit ARO
O :o �SSIQy. 9%
SEAL:
M 10147
(Z_
i'p'FtG114
\A .
C-438
1983 J
Page 6 of 7

Permit No. SW7110105
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.
✓ 4.55 The outlet/bypass structure elevations are per the approved plan.
:/6. The outlet structure is located per the approved plans.
VIA--7. Trash rack is provided on the outletibypass structure.
✓6. All slopes are grassed with permanent vegetation.
- . Vegetated slopes are no steeper than 3:1.
,/f0. The inlets are located per the approved plans and do not cause short-
circuiting of the system.
1✓ 1. The permitted amounts of surface area and/or volume have been
provided.
✓ 122 Required drawdown devices are correctly sized per the approved plans.
-�13. All required design depths are provided.
4. II 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.
cc: NCDENR-DWQ Washington Regional Office
Craven County Building Inspections
Page 7 of 7

Permit No.
(fo be provided by DWQ)
LTMWA
TA
O2pF WA7-
NCDENR
C
o
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information.
I: PROJECT INFORMATION
Project name
Croatan Church of Christ
Contact person
Bobby Billingsley, PE
Phone number
252.637,2727
Date
1.6.2011
Drainage area number
1
II. DESIGN INFORMATION , • i¢�i .r . .. e. . __ _.: ..-_ •. � -, ,-- __s L: • ' _... .:...' __ � 'i_1'.,_
Site Characteristics
Drainage area 75,326 ft'
Impervious area, post -development 42,000 ft' (/
%impervious 55.76 %I/
Design rainfall depth 1.5 in t/
Storage Volume: Non -SA Waters
Minimum volume required 5,179 ft3 Insufficient required volume.
Volume provided
Storage Volume: SAWaters
1.5' runoff volume
Pre -development 1-yr, 24-hr runoff
Post -development 1-yr, 24-hr runoff
Minimum volume required
Volume provided
Peak Flow Calculations
Is the preipost control of the 1yr 24hr storm peak flow required?
1-yr, 24-hr rainfall depth
Rational C, pre -development
Rational C, post -development
Rainfall intensity: l-yr, 24-hr stonn
Pre -development 1-yr, 24-hr peak flow
Post -development 1-yr, 24-hr peak flow
PrelPost 1-yr, 24-hr peak flow control
Elevations
Temporary pool elevation
Permanent pool elevation
SHVIT elevation (approx. at the perm. pool elevation)
Top of 1 Oft vegetated shelf elevation
Bottom of 1Oft vegetated shelf elevation
Sediment cleanout, top elevation (bottom of pond)
Sediment cleanout, bottom elevation
Sediment storage provided
Is there additional volume stored above the state -required temp. pool?
Elevation of the top of the additional volume
5,567 fts
OK, volume provided is equal to or in excess of volume required.
ft3
fts
ft3
fta
ft3
JAN 14 2011
Y (Y or N)
3.7 in
0.20 (unitless)
0.55 (unitless)
7.00 in/hr OK
2.42 ft'Isec
7.50 ftslsec
5.08 ft'Isec
25.50 fmsl
24.50 fmsl
23.5 a1- first
25.00 fmsl
24.00 fmsl
19.50 fmsl
18.50 fmsl
1.00 it
N (Y or
N)
fmsl
Form SW401-Wet Detention Basin-Rev.8-9117109 Parts I. & II. Design Summary, Page 1 of 2

Permit No.
no be Provided by DwQ)
Surface Areas
Area, temporary pool
Area REQUIRED, permanent pool
SAIDA ratio
Area PROVIDED, permanent pool, Ap,...
Area, bottom of 10ft vegetated shelf, A...
Area, sediment cleanout, top elevation (bottom of pond), A....
Volumes
Volume, temporary pool
Volume, permanent pool, Vp,,,,, .
Volume, forebay (sum of forebays if more than one forebay)
Forebay %of permanent pool volume
SAIDA Table Data
Design TSS removal
Coastal SAIDA Table Used?
Mountain/Piedmont SAIDA Table Used?
SAIDA ratio
Average depth (used in SAIDA table):
Calculation option 1 used? (See Figure 10-2b)
Volume, permanent pool, Vp,, -.
Area provided, permanent pool, A._,,
Average depth calculated
Average depth used in SAIDA, d., (Round to nearest 0.5ft)
Calculation option 2 used? (See Figure 10-2b)
Area provided, permanent pool, Ap,,,,.
Area, bottom of 10ft vegetated shelf, A.,i,mf
Area, sediment cleanout, top elevation (bottom of pond), Ab,
'Depth' (distance blw bottom of 10ft shelf and top of sediment)
Average depth calculated
Average depth used in SAIDA, d,,, (Round to nearest 0.511)
Drawdown Calculations
Drawdown through orifice?
Diameter of orifice (if circular)
Area of orifice (if -non -circular)
Coefficient of discharge (Co)
Driving head (Ho)
Drawdown through weir?
Weir type
Coefficient of discharge (C„)
Length of weir (L)
Driving head (H)
Pre -development 1-yr, 24-hr peak flow
Post -development 1-yr, 24-hr peak flow
Storage volume discharge rate (through discharge orifice or weir)
Storage volume drawdown time
Additional Information
Vegetated side slopes
Vegetated shelf slope
Vegetated shelf width
Length of flowpath to width ratio
Length to width ratio
Trash rack for overflow & orifice?
Freeboard provided
Vegetated filter provided?
Recorded drainage easement provided?
Capures all mnoff at ultimate buildcut?
Drain mechanism for maintenance or emergencies is:
6,357 ft
4,218 ft
5.60 (unitless)
4,234 it` OK
2,792 ft'
992 ft`
5,567 ft' OK
9,715 fi'
1,962 ft'
20.2% % OK
90 %
Y (Y or N)
N (Y or N)
5.60 (unitless)
(Y or N)
9,715 ft'
4,234 e
It
ft
Y (Y or N)
4,234 fit`
2,792 ft'
Need 3 ft min.
992 fe
4.50 ft
3.40 It OK
3.5 It OK
Y (Y or N)
1.25 in
in'
0.60 (unitless)
1.00 ft
N (Y or N)
(unitless)
(unitless)
ft
it
2.42 ft'/sec
7.50 ft'/sec
0.03 ft'Isec
2.00 days
OK, draws down in 2-5 days.
3:1
OK
10 :1
OK
10.0 ft
OK
3:1
OK
3.0 :1
OK
Y (Y or N)
OK
1.5 It
OK
N (Y or N)
OK
Y (Y or N)
OK
Y (Y or N)
OK
Mechanical Pumps
Farm SW401-Wet Detention Basin-Rev.8-9117/09 Parts I. & II. Design Summary, Page 2 of 2

Permit
(to be provided by DWQ)
III. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Page/ Plan
Initials
/Z t'
Sheet No.
1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build -out,
- Off -site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Basin dimensions,
- Pretreatment system,
- High Flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW),
- Overflow device, and
- Boundaries of drainage easement.
2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
- Outlet structure with trash rack or similar,
- Maintenance access,
- Permanent pool dimensions,
- Forebay and main pond with hardened emergency spillway,
- Basin cross-section,
- Vegetation specification for planting shelf, and
- Filter strip.
7
3. Section view of the wet detention basin (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower,
- Pretreatment and treatment areas, and
- Inlet and outlet structures.
4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin.
7Z�rS
7
5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided.
6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
7. The supporting calculations.
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
N
9. A copy of the deed restrictions (if required).
10. A soils report that is based upon an actual Feld investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
Form SW401-Wet Detention Basin-Rev.8-9/17/09 Part III. Required Items Checklist, Page 1 of 1

SCS Type III Storage Routing
Croatan Church of Christ - Wet Detention Pond
Design Storm = SCS Type III Hydrograph
1 yr Storm
7.00
cfs
flow
1 yr Storm
3.52
in/24 yr
precipitation
C pre
0.2
C post
0.55
Imp. Area
42000
sf
post development
Total Area
75326
sf
Qpre
2.42
cfs
rational method
Pond Storage for I yr/24 hour precipitation
Rv
0.55
V
12193
cf
<=1yr/24 hr Storm Volume
Pond Storage
5567
cf
<=Design
Time
Prec. Ratio
I yr storm (in)
Inflow (ft3)
Storage (ft)
Outflow (ft)
Outflow (cfs)
0.0
0.00000
0.00000
>
• • -.'
0.2
0.00200
0.00704
24.39
24.39
0.00
0.00
0.4
0.00400
0.01408
24.39
48.77
0.00
0.00
0.6
0.00600
0.02112
24.39
73.16
0.00
0.00
0.8
0.00800
0.02816
24.39
97.54
0.00
0.00
1.0
0.01000
0.03520
24.39
121.93
0.00
0.00
1.2
0.01200
0.04224
24.39
146.31
0.00
0.00
1.4
0.01400
0.04928
24.39
170.70
0.00
0.00
1.6
0.01600
0.05632
24.39
195.08
0.00
0.00
1.8
0.01800
0.06336
24.39
219.47
0.00
0.00
2.0
0.02000
0.07040
24.39
243.86
0.00
0.00
2.2
0.02203
0.07755
24.75
268.61
0.00
0.00
2.4
0.02412
0.08490
25.48
294.09
0.00
0.00
2.6
0.02627
0.09247
26.21
320.30
0.00
0.00
2.8
0.02848
0.10025
26.95
347.25
0.00
0.00
3.0
0.03080
0.10842
28.29
375.54
0.00
0.00
3.2
0.03308
0.11644
27.80
403.34
0.00
0.00
3.4
0.03547
0.12485
29.14
432.48
0.00
0.00
3.6
0.03792
0.13348
29.87
462.35
0.00
0.00
3.8
0.04043
0.14231
30.60
492.95
0.00
0.00
4.0
0.04300
0.15136
31.34
524.29
0.00
0.00
4.2
0.04563
0.16062
32.07
556.36
0.00
0.00
4.4
0.04832
0.17009
32.80
589.16
0.00
0.00
4.6
0.05107
0.17977
33.53
622.69
0.00
0.00
4.8
0.05388
0.18966
34.26
656.95
0.00
0.00
5.0
0.05670
0.19958
34.38
691.33
0.00
0.00
5.2
0.05968
0.21007
36.33
727.67
0.00
0.00
5.4
0.06267
0.22060
36.46
764.12
0.00
0.00

5.6
0.06572
0.23133
37.19
801.31
0.00
0.00
5.8
0.06883
0.24228
37.92
839.23
0.00
0.00
6.0
0.07200
0.25344
38.65
877.88
0.00
0.00
6.2
0.07530
0.26506
40.24
918.12
0.00
0.00
6.4
0.07880
0.27738
42.67
960.79
0.00
0.00
6.6
0.08250
0.29040
45.11
1005.90
0.00
0.00
6.8
0.08640
0.30413
47.55
1053.46
0.00
0.00
7.0
0.09050
0.31856
49.99
1103.45
0.00
0.00
7.2
0.09480
0.33370
52.43
1155.88
0.00
0.00
7.4
0.09930
0.34954
54.87
1210.74
0.00
0.00
7.6
0.10400
0.36608
57.31
1268.05
0.00
0.00
7.8
0.10890
0.38333
59.74
1327.79
0.00
0.00
8.0
0.11400
0.40128
62.18
1389.98
0.00
0.00
8.2
0.11943
0.42039
66.21
1456.18
0.00
0.00
8.4
0.12532
0.44113
71.82
1528.00
0.00
0.00
8.6
0.13167
0.46348
77.42
1605.42
0.00
0.00
8.8
0.13848
0.48745
83.03
1688.46
0.00
0.00
9.0
0.14580
0.51322
89.25
1777.71
0.00
0.00
9.2
0.15348
0.54025
93.64
1871.35
0.00
0.00
9.4
0.16167
0.56908
99.86
1971.21
0.00
0.00
9.6
0.17032
0.59953
105.47
2076.67
0.00
0.00
9.8
0.17943
0.63159
111.08
2187.75
0.00
0.00
10.0
0.18900
0.66528
116.68
2304.44
0.00
0.00
10.2
0.19928
0.70147
125.34
2429.78
0.00
0.00
10.4
0.21052
0.74103
137.05
2566.82
0.00
0.00
10.6
0.22272
0.78397
148.75
2715.58
0.00
0.00
10.8
0.23588
0.83030
160.46
2876.03
0.00
0.00
11.0
0.25000
0.88000
172.16
3048.20
0.00
0.00
11.2
0.26644
0.93787
200.45
3248.64
0.00
0.00
11.4
0.28656
1.00869
245.32
3493.96
0.00
0.00
11.6
0.31430
1.10634
338.23
3832.19
0.00
0.00
11.8
0.37330
1.31402
719.37
4551.57
0.00
0.00
12.0
0.50000
1.76000
1544.83
6096.39
1544.83
2.06
12.2
0.62670
2.20598
1544.83
7641.22
1544.83
2.06
12.4
0.68570
2.41366
719.37
8360.59
719.37
0.96
12.6
0.71344
2.51131
338.23
8698.82
338.23
0.45
12.8
0.73336
2.58141
242.83
8941.65
242.83
0.32
13.0
0.75000
2.64000
202.94
9144.59
202.94
0.27
13.2
0.76412
2.68970
172.16
9316.75
172.16
0.23
13.4
0.77728
2.73603
160.46
9477.21
160.46
0.21
13.6
0.78948
2.77897
148.75
9625.96
148.75
0.20
13.8
0.80072
2.81853
137.05
9763.00
137.05
0.18
14.0
0.81100
2.85472
125.34
9888.35
125.34
0.17
14.2
0.82057
2.88841
116.68
10005.03
116.68
0.16
14.4
0.8296
22.92047
111.08
10116.11
111.08
0.15
14.6
0.83833
2.95092
105.47
10221.57
105.47
0.14
14.8
0.84652
2.97975
99.86
10321.43
99.86
0.13

15.0
0.85430
3.00714
94.86
10416.29
94.86
0.13
15.2
0.86152
3.03255
88.03
10504.32
88.03
0.12
15.4
0.86833
3.05652
83.03
10587.36
83.03
0.11
15.6
0.87468
3.07887
77.42
10664.78
77.42
0.10
15.8
0.89057
3.09961
71.82
10736.60
71.82
0.10
16.0
0.88600
3.11872
66.21
10802.80
66.21
0.09
16.2
0.89110
3.13667
62.18
10864.99
62.18
0.08
16.4
0.89600
3.15392
59.74
10924.73
59.74
0.08
16.6
0.90070
3.17046
57.31
10982.04
57.31
0.08
16.8
0.90520
118630
54.87
11036.91
54.87
0.07
17.0
0.90950
3.20144
52.43
11089.33
52.43
0.07
17.2
0.91360
3.21587
49.99
11139.33
49.99
0.07
17.4
0.91750
3.22960
47.55
11186.88
47.55
0.06
17.6
0.92120
3.24262
45.11
11231.99
45.11
0.06
17.8
0.92470
3.25494
42.67
11274.66
42.67
0.06
18.0
0.92800
3.26656
40.24
11314.90
40.24
0.05
18.2
0.93117
3.27772
38.65
11353.55
38.65
0.05
18.4
0.93428
3.28867
37.92
11391.47
37.92
0.05
18.6
0.93733
3.29940
37.19
11428.66
37.19
0.05
18.8
0.94032
3.30993
36.46
11465.12
36.46
0.05
19.0
0.94330
3.32042
36.33
11501.45
36.33
0.05
19.2
0.94612
3.33034
34.38
11535.83
34.38
0.05
19.4
0.94891
3.34023
34.26
11570.10
34.26
0.05
19.6
0.95168
3.34991
33.53
11603.63
33.53
0.04
19.8
0.95437
3.35938
32.80
11636.42
32.80
0.04
20.0
0.95700
3.36864
32.07
11668.49
32.07
0.04
20.2
0.95958
3.37772
31.46
11699.95
31.46
0.04
20.4
0.96211
3.38663
30.85
11730.80
30.85
0.04
20.6
0.96460
339539
30.36
11761.16
30.36
0.04
20.8
0.96704
3.40398
29.75
11790.91
29.75
0.04
21.0
0.96940
3.41229
28.77
11819.68
28.77
0.04
21.2
0.97179
3.42070
29.14
11848.82
29.14
0.04
21.4
0.97410
3.42883
28.17
11876.99
28.17
0.04
21.6
0.97636
3.43679
27.56
11904.54
27.56
0.04
21.8
0.97858
3.44460
27.07
11931.61
27.07
0.04
22.0
0.98080
3.45242
27.07
11958.68
27.07
0.04
22.2
0.98288
3.45974
25.36
11984.04
25.36
0.03
22.4
0.98496
3.46706
25.36
12009.40
25.36
0.03
22.6
0.98700
3.47424
24.87
12034.28
24.87
0.03
22.8
0.98899
3.48124
24.26
12058.54
24.26
0.03
23.0
0.99090
3.48797
23.29
12081.83
23.29
0.03
23.2
0.99284
3.49480
23.65
12105.48
23.65
0.03
23.4
0.99470
1 3.50134
22.68
12128.16
22.68
0.03
23.6
0.99651
3.50772
22.07
12150.21
22.07
0. 33
23.8
0.99828
3.51395
21.58
12171.81
21.58
0.03
24.0
1.00000
3.52000
20.97
12192.78
20.97
0.03

Outflow (cfs)
O N
O lA F+ lli N lA
0.0
0.6
1.2
1.8
2.4
3.0
3.6
4.2
4.8
5.4
6.0
6.6
i
7.2
7.8
n
S
8.4
O O
9.0
9.6
�Nr
10.2
(� O
S
10.8
'1 11.4
N
3
A
12.0
S
rt
12.6
13.2
13.8
M
14.4
Q-
15.0
C
15.6
rt
h
16.2
C
16.8
17.4
18.0
18.6
19.2
19.8
20.4
21.0
21.6
22.2
22.8
23.4
24.0

Permit Number: �W 00 IU5
(7o be provided br UII'Q)
Drainage Area Number:
Wet Detention Basin Operation and Maintenance Agreement
I will keep a maintenance record on this ItMP. This maintenance record will be kept in a
log in a known set location. Any deficient RMP elements noted in the inspection will be
corrected, repaired or replaced immediately. 'these deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the IM1.
The wet detention basin system is defined as the wet detention basin,
pretreatment including forebays and the vegetated filler if one is provide(].
This system (check one):
❑ does ® does not
This system (check one):
❑ does © does not
incorporate a vegetated filter at the outlet.
incorporate pretreatment other than a forebay.
Important maintenance procedures:
- Immediately after the wet detention basin is established, the plants on the
vegetated shelf and perimeter of the basin should lie watered twice weekly if
needed, until the plants become established (amunonly six weeks).
— Plo portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
— Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
— If the basin must be drained for an emergency or to perform maintenance, [lie
flushing of sediment thrOUllh the emergency drain should be minimized to the
maximum extent practical.
— Once it year, a dam safety expert should inspect the embankment.
JAN 14 2011
After the wet detention pond is established, it should be inspected once a month and
within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a
Coastal County). Records of operation and maintenance should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately,
BMP element:
Potentialproblem:
Ilow I will remediate theproblem:
The entire BMP
Trash/debris is resent-
Remove the trash/dehris.
The perimeter of the wet
Areas of bare soil and/or
Regrade the soil if necessary to
detention basin
erosive gullies have funned.
remove the gully, and then plant it
ground cover mid water until it is
established. Provide lime and a
one -lime fertilizer a pplication.
Vegetation is text short or too
Maintain vegetation at a height of
long,.
a i roximateh, sic inches.
Form SW401-Wel Detention Basin Page 1 0I'4

Permit Number:
(Io Ih• prurideal by DII'OI
Urinate Area Number:
DMP element:
Potentialproblem:
How I will remediate theproblem:
The inlet device: pipe or
The pipe is clogged.
Unclog the pipe. Dispose of the
swan'
sedllnllit off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged.
Erosion is occurring in the
Regrade the swale if necessary to
sovale.
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap In avoid
future problems will, erosion.
The forebay
Sediment has accrunulated to
Search for the source of the
a depth greater than the
sediment and renmedy the problem if
original design depth for
possible. Remove the sediment and
sediment storage.
dispose of it in a location where it
will not cause impacts to streams or
the IMP.
Erosion has occurred.
Provide additional erosion
protection such as reinforced turf
malting or riprap if needed to
prevent future erosion problems.
Weeds are present
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than s prayin .
The vegetated shelf
Best professional practices
Prune according to lest professional
show [hat pruning is needed
practices
to maintain optinmal plant
health.
Plants are dead, diseased or
Determine the source of the
(filing.
problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessarv.
Weeds are present.
Remove the weeds, preferably by
hand. If pesticide is used, wile it on
the plants rather than s ravin ,
The main treatment area
Sediment has accumulated to
Search for [he source of the
a depth greater than the
sediment and remedy the problem if
original design sediment
possible. Remove the se liment and
storage depth.
dispow of it in a location where it
will not cause impacts to streams or
the RpIP.
Algal growth covers over
Consull a professional to remove
50". of the area.
and control the algal growth.
Cattails, phragmites or other
invasive pirates cover 50% of
Remove the plants by wiping them
with pesticide (do not spray).
the basin surfam.
Form S%V-pl I -Wet Detention Basin O&M-Rc%-A face 2 of-d

Permit Number:
(to be provi(fcrl by DIPQ)
Drainage Area
BMP element:
Potentialproblem:
How I will remediate theproblem:
The embankment
Shrubs have started to grow
Remove shrubs immedialely.
on the embankment.
Gvidence of muskrat or
Use traps to remove muskrats and
beaver activily is present.
consult a professional to remove
beavers.
A tree has started to grow on
Consult a dam safety specialist to
the embankment.
remove the tree.
An annual inspection by an
Make all needed repairs.
appropriate professional
shows that the embankment
needs repair. if a Iicablc
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose
of the sediment off -site.
The outlet device is damaged
Repair or replace the outlet device.
The receiving water
L'rosion or other signs of
Contact the local NC Division of
damage have occurred at the
Water Qualih, Regional Office, or
outlet.
the 401 Oversight Unit at 919-733-
1786.
The measuring device used to determine the sediment elevation shall be such
that it will give an accurate depth reading and not readily penetrate into
accumulated sediments.
When the permanent pool depth reads 5;0 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 5.0 feet in the forebav, the sediment
shall be removed.
BASIN DIAGRAM
UI( is the h@tnkq
Sediment Removal I:. 19.5 I'e n:mell
______________ Volume
Rotlom IIcvatim IR,S R Min.
SLdimcnt
Storage
Penman ml Pool Elevation 24.5
__-_Sediment Removal Elevation 19.5-_-_ Volume
Bnitmn I:Icvatinn 18S
storage
LOREB,\V
MAIN POND
Pnmi S\VJ01-\Vet Detention Basin O&M-Rcv.d Page 3 of 4

Pennit Numher:
Oo he provided ter
I acknowledge and agree by my signature below that I ante responsible for the
performance ol'the maintenance procedures listed above. I agree to notily DWQ of an}
problems tvilh the system or prior to ;my changes to the system or responsible party.
Project name:Cro:uan Church of Christ
Bit9P drainage urea number: l
Print nanhc:Cnaie Hearne
Title["rnasice - Croatan Church ol'Chrisl
Address:3445 Old Airport Road. New Bern. NC 28562
Date:
Note: The legally responsible party should not be a Iwmemmers assmiation unless more than 5051. of
the lots have been sold and a resident ul'the sutxlivisiun has been n:uncd the president.
I. G � iQ r 1 o —f�) l O Uk )-I . a Notary Public liter the State of
(� O r ect t''Dt 1i r-\Xomuv of _�Q t4Q do hereby certify that
- personal[\, appeared before me this 5 ",
clay of 70k a�d r v _. _;)O Ll_ and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal. /J.�IS�L<.,a� 4&uq,t�
SEAT.
vlv commission expires (-1 vie V�
harm SW401.O'et I )emotion Basin U C\I-Re%'.J
PaLe4 of'4

STORMWATER SUBMITTAL REQUIREMENTS
WET DETENTION POND
Objective
A. Collect all runoff from all BUA (proposed and/or existing and/or offsite) as the case may be,
by any means including piping or swales, and direct it to the pond.
B. Check the proposed pond design to make sure it meets or exceeds the minimum design
criteria for surface area, volume and drawdown.
II. What makes up a complete wet detention pond application package?
A. Two sets of sealed, signed & dated layout & grading plans with appropriate details.
(Additional sets of plans may be requested for projects in certain counties)
B. Completed application with supplement(s), SWU-101, SW401-Wet Pond, and inspection and
maintenance agreements.
C. Deed restriction document, if applicable (for subdivisions & projects with out parcels)
D. Sealed, signed & dated calculations.
E. Estimated seasonal high water table elevation at all pond locations.
F. Chlorides test results must be provided if the project is within ''/z mile of SR waters (Phase II).
(This is only required to test out of SR water treatment requirements)
III. BIMS entry (for DWQ use only)
Enter & track application acknowledged date, review date, add info requested/received dates, permit
issue dates, and drainage area info. Best done after the add info letter is written and before sending
permit up for signature.
IV. Shell documents (for DWQ use only)
Permit shells: s:\wqs\stormwater\shells\highcompond
s:\wqs\stormwater\shells\highsubpond
s:\wqs\stormwater\shells\HDhybrid
Spreadsheet: s:\wqs\stormwater\excel spreadsheets\pond
VI. Review Procedure
A. APPLICATION
1. V�An original signature is required. Photocopied signatures cannot be accepted.
2. ✓A completed wet detention pond supplement and a signed, dated and notarized wet
3. ✓detention pond Inspection and Maintenance Agreement with an original signature.
The numbers on the supplement match up to the numbers used in the calculations and
shown on the plan details.
4. �/Built-upon areas are reported in square feet in Section 111.6.
5. Receiving stream name and classification. This is important because in the non -Phase
I I,counties, a wet pond cannot be used on a project that is within Y2 mile of and draining
to SA waters. For Phase 11, a wet pond is allowed within '/2 mile of SA waters.
6. ✓Section 111.6 is filled in -cannot be left blank. One column must be filled in for each
7. t/proposed wet pond.
If the applicant is a corporation, partnership or LLC, look it up on the Secretary of State
Corporations Database. Make sure corporation is spelled correctly (capitalization and
punctuation matter) and that the person signing the application is at least a vice-
president in the corporation, a General Partner in the partnership, a member in a
member -managed LLC, or the manager of a manager -managed LLC. Need
documentation to support if the Articles of Incorporation do not list the members or
managers of the LLC. If an agent signs, then a letter of authorization is needed from the
sident, vice president, general partner, member or manager.
81 For subdivided projects, a signed and notarized deed restriction statement must be
provided.

Wet Detention Pond, cont.
B. CALCULATIONS
1. The orifice is sized based on drawing down the calculated minimum volume in 2-5
days. The average head to use in the orifice equation is approximately one-third of
the distance between the permanent pool elevation (PPE) and the elevation of the
next available outlet above the permanent pool. The elevation of the next available
outlet must be either the elevation where the minimum volume is provided, or it can
be higher. The temporary pool elevation (TPE) to report on the supplement will be
the elevation of the next available outlet above the PPE. The temporary pool volume
(TPV) to report on the supplement is the volume between the specified PPE and the
TPE.
2. For Phase II projects that are within '/2 mile of and draining to SR waters, the
difference in runoff from the predevelopment and post -development conditions for
the 1 year 24 hour storm must be controlled and treated.
3. For Phase II projects, the discharge rate leaving the pond can be no more than the
pre -development discharge rate for the 1 year 24 hour storm.
4. For Phase II projects draining to SA water, no discharge to surface waters may occur
from wet ponds. The discharge leaving the orifice must be effectively infiltrated prior to
reaching surface waters.
5. The average pond depth is the permanent pool volume divided by the permanent pool
surface area. The result must be between 3 ft. and 7.5 ft. Parts of the pond can be
deeper than 7.5 ft., but in no case can any part of the pond be less than 3 ft deep.
6. If the 85% TSS chart is used a 30' vegetated filter must be provided at the outlet of the
pond. If the 90% TSS chart is used, no filter is required.
7. Use the correct SA/DA TSS chart from the BMP Manual noting that there are different
charts for different areas of the State.
8. Required surface area at permanent pool.
9. Provided surface area at permanent pool (Based on pond dimensions)
10. Required volume calculation based on 1.5" storm for Phase II projects* and 1" storm for
all others projects. *unless the project is Phase 11 and within '/2 mile of and draining to
SR waters then the volume calculation must be based on difference between the pre
and post development conditions for the 1-yr 24-hr storm.
11. Table of elevations, areas, incremental volumes and accumulated volumes for overall
pond and for forebay, to verify volumes provided.
12. Forebay designed to hold 20% of the permanent pool volume. (Range of 18%-22%
OK.)
13. Non -erosive flow for 10 yr. storm in the vegetated filter, if using 85% TSS.
14. The seasonal high water table must be at or below the proposed permanent pool
elevation to assure that the necessary volume will be available above the permanent
pool.
15. Rounding numbers off during the calculation process can result in deficiencies. Do not
round the numbers until you get to the final result.
16. An additional one foot must be excavated below the bottom elevation of the pond. The 1
foot sediment accumulation depth is not included in the average depth calculation.
I-ov = O'C� fi G,S n T"' =U,hS
v 3E

Wet Detention Pond, cont.
C. PLANS- Due to storage space constraints, plan sheets should be kept to a minimum. For
small commercial single wet pond projects, the plan set could consist of only 2 or 3 sheets,
layout, grading and details. For larger projects, show as much information as possible on as
few sheets as possible, without cluttering them up.
1. ��Oevelopment/Project Name
2. Engineer name and firm.
3. � Legend
4. North Arrow
5. V'Location Map with nearest intersection of two major roads shown. Major road is any 1,
2, or 3 digit NC, US or interstate highway.
6. 'Location
standard engineering scale, no off-the-wall stuff.
7.✓ Date
8. ✓Revision number and date, if applicable.
9. ✓Original contours, proposed contours, spot elevations, finished floor elevations, pipe
10✓I Swale inverts, etc.
Existing drainage (piping, swales, ditches, ponds, etc.), including off -site. Include a map
delineating the offsite drainage areas.
11.VP,roperty/Project boundary lines, bearing & distances.
12.� Mean High Water Line or Normal High Water Line, if applicable.
13. The permanent pool elevation must be above the SHWT and above the lowest
elevation of adjacent wetlands. Evaluate the need for a liner and/or berm/slurry wall to
prevent dewatering the wetland.
14 ✓Drainage easement widths, pipe sizes and swale inverts are provided.
15.✓Wetlands delineated, or a note on the plans that none exist. Get a copy of the wetlands
delineation map signed by the Corps of Engineers, or have the applicant include a copy
of the unsigned delineation map submitted to the Corps. Wet ponds may not be located
in wetlands unless a permit to fill those wetlands has been obtained.
16. Details for the roads, parking, cul-de-sacs, including sidewalk width, radii, dimensions &
f slopes.
1ll!(/IApartment / Condo development- Provide a typical building footprint with dimensions
and note all concrete and wood deck areas.
18. The drainage area for each wet pond is clearly delineated and numbered to match up to
the calculations and supplement. Drainage area delineation is best done as a separate
/plan sheet.
19. A pond section detail to include the forebay, a 10 foot wide vegetated shelf, pertinent
elevations for the bottom, permanent pool, temporary pool, and SHWT, 3:1 slopes
above the permanent pool, and the weir elevation between the main pond and the
✓forebay.
20. The 10 vegetated shelf extends 6" below and 6" above the permanent pool elevation.
21. ✓An outlet structure detail showing a trash rack with <_6" square openings, the necessary
orifice invert elevation (i.e., the permanent pool), orifice size and temporary pool
elevation.
22.✓ Dimensions for each line and arc formed by the permanent pool contour.
23. Where the 85% TSS chart was used, a 30 ft. vegetated filter strip is required to be
/shown on the plans & detailed (elevations, inverts, slopes, and flow spreader
V mechanism). Please note that the filter strip is not a ditch.
24., /A forebay is provided for each inlet and located so as to prevent short-circuiting.
25. The pond must have a minimum 1.5:1 length to width ratio and a minimum 3:1 flow path
length. Artificial "baffles" of timber, vinyl, or earth can be used to create a longer flow
path. The top elevation of the baffle should be set at the temporary pool elevation or
higher.
26 A Vegetation plan is specified for the pond, including slopes. Wetlands species are
listed for planting on the 10:1 shelf. Weeping Love Grass is not suitable as a permanent
vegetated cover for pond slopes.
27. All roof drainage must be directed to the pond. Show the roof drain collection lines on
the plan. This is necessary for projects where the buildings back up the property lines
where roof drainage may leave the site prior to going through the pond.

WET DETENTION POND ANALYSIS -ALL RULES
FILE NAME:
S:IWQS\STORMWATERIEXCELSPREADSHEETSIPONDI110105
PROJECT*SW7
110105
REVIEWER:
Sdumpor
Initial Run Date ????
PROJECT NAME:
Croatan Church of Christ
Last modified
21-Feb-11
Receiving Stream:
Neuse River
Class:
SB, Sw NSW
Drainage Basin:
Neuse
Within 112 mile
S N�Y or N
Index No.
27-104
@Drainage Area
feet DA Area 1.73 acres
Buildings 5025.00 square feet
1
user input rec
Street 21254.00 square feet
0.98
formula
SW square feet
Future 14860.00 square feet
0.98
Offsite square feet
Other 861.00 square feet
0.98
_
BUr A at dill. DO) (square feet
TOTAL 42000.00 square feet
SURFACE AREA CALCULATION (with added DA and BUA at different design storm)
Overall % Impervious
1 55.76%
SA/DA Ratio
5.58%
Average Design Depth
1 3.5
feet
Req. SA
4200
sf
TSS, 85 or 90:
90
°h
Prov. SA
4234
sf
TEMPORARY POOL AND FOREBAY VOLUME CALCULATIONS
New BUA
Old BUA
DrainageAream
75326.00
sf
BUA
42000.00
0.00
sf
Post development Rv=
0.552
#DIV/01
unitless
Old BUA Design Storm
inches
Old BUA Design Volume
0
1.5" New BUA Design Storm Volume
5196
1 yr. 24 hour precipitation depth (inches)
from NOAA Chart
Predevelopment Rv value
I
lUse 0.05 it no existing BUA
1 yr. 24 hr. Pre -development volume
0
cubic feet
1 yr. 24 hr. Post -development volume
0
cubic feet
2008 Design Volume 5196 1 cubic feet
Phase 2 Design Volume 5196 cubic feet
Average Head
Flow 02, cfs
Flow 05, cfs
No. of Orifices
Diameter, inches
Drawdown =
1 yr 24 hr intensity, inthr
Runoff Coefficient
1 yr 24 hr peak Q
Orifice flow<lyr24hr T
0.32
feet Q2 Area 4_ 1.60
ds Q5 Area 0.64
cfs Orifice Area 1.23
Av . Flow Q=I 0.023
or weir H x W in x
days '# of end contractions, N =
NOAA chart @ discharge coefficient, C =
unitless Effective weir length, L =
cfs
sq. inches
sq. inches
sq. inches
cfs
0.030
0.012
1
1.25
2.6
3.70
3.31
0.66
0.00
4.21
YES -OK