SW8020532_COMPLIANCE_20020731

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. I SW e)6aC�3Z
DOC TYPE I ❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE r� -7
YYYYMM DD

WET DETENTION POND ANALYSIS
FILE NAME:
PROJECT #: SW8 020532
PROJECT NAME: HQ Armory @Camp Lejeune
G:\DATAIWPDATA\WQSXPOND\020532.WK1
REVIEWER: L. Lewis
DATE: 31-Jul-02
Receiving Stream: New River Class: SC NSW
Drainage Basin: White Oak Index No. 19-(15.5)
Site Area 0.75 acres
Drainage Area 38918'00 square feet Area in Acres 0.87 acres
Offsite = 0.12 acres
IMPERVIOUS AREAS
Building
Parking
Sidewalks
Gravel
Offsite
TOTAL
SURFACE AREA CALCULATION
% IMPERVIOUS 77.61%
Des. Depth 4
TSS: 90
VOLUME CALCULATION
Rational C
7352.00
square feet
1,00
972.00
square feet
1.00
1000.00
square feet
1.00
14854.00
square feet
1.00
5328.00
square feet
1.00
square feet
20$03 00,
square feet
Rational ?*
1
Des. Storm�==00'--:inches
Rv=
0.748
Bottom
2.59 msl
Perm. Pool
6 56, m s I
...................................
Design Pool
7.26 msl
Storage met @elev 7.26 msl
Req. Volume
672
cf
Vol. Prov, at DP
_:67>
cf
ORIFICE CALCULATION
Avg. Head =
Flow Q2, cfs
Flow Q5, cfs
No. of Orifices
Diameter, inches
Drawdown =
0.33 ft
0.015 cfs
0.006 cfs
weir Hx.W
days
Rational Cc= 0.84
SA/DA Ratio 6.76%
Req. SA 2570 sf
Prov. SA sf
* place a "1" in the box if Rational is used
FOREBAY
Perm. Pool Volume=
Req. Forebay Volume=
0
Provided Volume=
Percent=
Elevation Area
Inc. Vol. Acc. Vol.
6.56 2799.00
0.00 0.00
8.20 4822.00
6249.22 6249.22
Q2 Area =
Q5 Area =
Orifice Area
Q=
f :<I in
COMMENTS
Surface Area , Volume and Orifice are within Design Guidelines
0.81 sq. inches
0.32 sq. inches
0.79 sq. inches
0.015 cfs
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