SW8960315_COMPLIANCE_19971120

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.-
SW*_67��
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE, -
YYYYM MDD

STORMWATER SUBMITTAL REQUIREMENTS
DETENTION POND
A. Site Plan
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Development/Project Name
Designers seal, signature, name and firm.
Legend
North Arrow
Location Map with direction, distance to named streets, NCSR numbers.
Scale
Date
Revision number and date.
Original contours, proposed contours, spot elevations, finished floor elevations.
Existing drainage, including off -site. Provide a map of any offsite areas.
Property/Project boundary lines, dimensioned.
Mean High Water Line, if project is adjacent surface waters.
Drainage easements, catch basins, pipe sizes, inverts.
Wetlands delineated, or a note on the plans that none exist. Ponds may not be located
in a wetland.
Details of the road, parking, cul-de-sacs, including sidewalks, curb and gutter..
Drainage area to each pond delineated.
Dimensions of the permanent pool.
Vegetated filter detail if using 85% TSS. This is NOT a connector ditch.
Dimensions of the road, parking cul-de-sacs, sidewalks, and curb and gutter.
Unit footprint with dimensions and concrete wood deck areas noted.for apartments
or condo development.
Forebay at each inlet. (Prefer one inlet)
Inlets located such that entire pond is used for treatment and no short-circuiting.
Pond/forebay section detail with:
Bottom elevation
Permanent pool elevation PP
Storage pool elevation SP
Slopes: 3:1 above permancnt pool
Vegetated shelf located below permanent pool, 6:1 slope, with begin and end
elevations around main pond. (Not required inside forebay)
1~orebay bottom elevation, 3:1 slopes,
Forebay weir elevation between PP and DP.
Outlet structure detail with trash rack and orifice size specified. Maximum trash rack
opening size•is 4". ,
25. Note on plans that all roof drains must be directed so as to be picked up by the pond.
26. A 3:1 L:W ratio has been provided for the pond.
Maximum avT era.ie pond depth of 6'. -(Parts of pond may be deeper -up to 7.5')
28: Vegetation requirements for pond slopes and wetland species for the 6:1 shelf are listed.
Weeping Love.grass is not suitable for use in North Carolina.

STORMWATER SUBMITTAL REQUIREMENTS
DETENTION POND (cont)
B. Calculations
1. 85% or 90% TSS Chart noted.
2. Pond depth.
3. SA/DA ratio calculation.
4. Required surface area at permanent pool.
5. Provided surface area at permanent pool (Based on pond dimensions)
6. Provided surface area at temporary design pool.
7. Required volume calculation.
8. Provided volume calculation.
9. Orifice size based on required 1" volume, using average head to design pool elevation.
10. Designer=s seal.
11. Built -upon area to each pond.
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.
C. Supporting Documentation
1. Completed permit application and supplement.
a. Is the person who signed the landowner or a leasee? Must be landowner.
b. All sections and blanks completely filled in.
C. Check signature per .1003 (e). Make sure title is provided.
d. If agent signs, signatory authorization from owner.
C. Wet detention supplement sheet provided.
f. Mailing address & phone of applicant- no CIO.
g. Verify water body classification.
h. Justifications for not meeting a design requirement.
i. If a modification, include Designer=s Certification.
j. Hand initial design requirements.
2. Proposed deed restrictions
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