HomeMy WebLinkAboutSW8060442_COMPLIANCE_20060928STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
?x%F.CJ`}a&
YYYYMMDD
WET DETENTION POND ANALYSIS
FILE NAME: S:IWQSIPOND1060442.WK1
PROJECT #: SW8 060442 REVIEWER:'L .:L ew►s
PROJECT NAME: Commercial hllini Mall Shallotte DATE: 28-Sep-06
Receiving Stream: Sharon Creek Class: SCHQW
Drainage Basin: Lumber....,:.;:. Index No. �c`•25.=-`` -�Z
Site Area -:<> 204 > acres
Drainage Area 88$620E) square feet Area in Acres 2.04
IMPERVIOUS AREAS
Rational C
Buildings
157D0 00 . square feet
Parking .4t765
DO square feet
SW
369,0 00 ` square feet
Street _.,.._::::.432a.40:`squarefeet
TOTAL
SURFACE AREA CALCULATION
% IMPERVIOUS
Des, Depth
TSS, 85 or 90:
74.02%
35
square feet
square feet
square feet
square feet
Rational Cc= 0.05
SA/DA Ratio 7.40%
Req. SA 6578 sf
Prov. SA 6C0>1' sf
VOLUME CALCULATION * place a "1" in the box if Rational is used
Rational ?*
Des. Storm
1:00<
inches
Rv=
0.716
Bottom
:.:-28�msl
Perm. Poo!
3f50.` msl
Design Pool
32 5 msl
Storage met @elev 32.26 msl
Req. Volume
5303
cf
Vol. Prov. at DP
7002
cf
ORIFICE CALCULATION
FOREBAY
Perm. Pool Volume=
Req. Forebay Volume=
Provided Volume=
Percent=
Elevation Area
€......3.150 :�.......:5601.00.�.::::
3250. 7402 00
<10050:
2a10
Inc. Vol.
7001,50
Avg. Head =
0.47 ft
Q2 Area =
1.33
sq. inches
Flow Q2, cfs
0.031 cfs
Q5 Area =
0.53
sq. inches
Flow Q5, cfs
0.012 cfs
Orifice Area
1.23
sq. inches
No. of Orifices
1',
Q=
0.028
cfs
Acc. Vol.
0.00
7001.50
Diameter, inches _ i 25 weir x - in
in x
Drawdown = 2.2 days Surface Area @DP = 7402 sq. ft.
Falling Head Drawdown = 3,9 days
C: 3.324166667 L= -0.095
COMMENTS
Surface Area , Volume and Orifice are within Design Guidelines