SW8050611_COMPLIANCE_20051025

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

WET DETENTION POND ANALYSIS
FILENAME: S:IWQSIPOND1050611.WK1
PROJECT : SWS 050611 REVIEWER: L. Lewis
PROJECT NAME: Country Boy Riders Motorcycle Club DATE: 25-Oct-05
Receiving Stream: Oulhite Oak Creek (Branch) Class: C Sw
Drainage Basin: Cape Fear Index No. CPF20 18-68-18-5
Site Area 3.82 acres
Drainage Area "63990 square feet Area in Acres 3.82
IMPERVIOUS AREAS
Rational C
Buildings
5000.00
square feet
Streets
16550.00
square feet
Parking
12620,00
square feet
SW
1080.00
square feet
square feet
square feet
square feet
TOTAL �2U10. square feet Rational Cc= 0.16
SURFACE AREA CALCULATION
IMPERVIOUS
21.18%
SAIDA Ratio
1,79%
Des. Depth
3
Req. SA
2986 sf
TSS:
85
Prov. SA
45 sf
VOLUME CALCULATION
Rational ?*
Des. Storm
1
inches
Rv=
0.241
Bottom
45 msl
Perm. Pool
msl
Design Pool
49 msl
Storage met @elev 48.85 msl
Req. Volume
337,.:
cf
Vol. Prov. at DP
cf
ORIFICE CALCULATION
Avg. Head =
Flow Q2, cfs
Flow Q5, cfs
No. of Orifices
Diameter, inches
Drawdown =
0,49 ft
0.019 cfs
0,008 cfs
C: 3.335277778
weir HxW
days
* place a "1" in the box if Rational is used
FOREBAY
Perm, Pool Volume=
7898
Req. Forebay Volume=
1579.6
Provided Volume=
1640.00
Percent=
8°l�
Elevation Area
Inc. Vol. Acc. Vol.
48,00 3560.00
0.00
49.00 4288.00
3924.00 3924,00
Q2 Area =
0.83
Q5 Area =
0.33
Orifice Area
0.59
Q=
0.014
.......................
in
x
Surface Area @DP =
Falling Head Drawdown =
L= -0.098
COMMENTS
Surface Area , Volume and Orifice are within Design Guidelines