HomeMy WebLinkAboutSW8040609_COMPLIANCE_20040701STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW XA(/1�a6�
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD
WET DETENTION POND ANALYSIS
FILE NAME: S:kWPDATA\WQSkPOND1040609.jun04.xis
PROJECT #- SW8 040609.jun04 REVIEWER: L. Munn
PROJECT NAME: Southern States Laydown Yard DATE: 01-Jul-04
Receiving Stream: NE Cape Fear River Class: C Sw
Drainage Basin: Cape Fear Index No.
Site Area 9.46 acres
Drainage Area 3571A square feet Area in Acres 8.20
IMPERVIOUS AREAS Rational C
Gravel Areas 283409.00 square feet
square feet
square feet
square feet
square feet
square feet
TOTAL square feet
SURFACE AREA CALCULATION
% IMPERVIOUS 79.36%
Des. Depth 4
TSS: 90
VOLUME CALCULATION
Rational ?*
Des. Storm inches
Rv= 0.764
Bottbm 0.3 msl
Perm. Pool msl
4' 1:1
Design Pool 5 msl
Storage met @elev 4.99 msl
2-- Req. Volume :7 c f
Vol. Prov, at DID 34cf _1
ORIFICE CALCULATION
Avg. Head =
Flow Q2, cfs
Flow Q5, cfs
No, of Orifices
Diameter, inches
Drawdown
Rational Cc= 0.04
SA/DA Ratio 6.94%
Req. SA 24770 sf
Prov. SA sf
* place a "'I " in the box if Rational is used
Perm. Pool Volume= 81901
Req. Forebay Volume= 16380.2
Provided Volume= 16723.00
Percent=
Elevation
4.30
5.00
Area Inc. Vol. Acc. Vol.
33192.00
33192.00 23234.40 23234.40
Q2 Area =
7.09
Q5 Area =
2.84
Orifice Area
3.14
Q=
0.058
7777777r77777=
in
x
Surface Area @DP =
Falling Head Drawdown
COMMENTS
Surface Area , Volume and Orifice are within Design Guidelines.
sq. inches
sq. inches
sq. inches
cfs
in
33192 sq. ft.
6.1 days