SW8041122_COMPLIANCE_20041208

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

WET DETENTION POND ANALYSIS
FILE NAME: S:IWQSIPOND1041122-A.nov04.WK1
PROJECT #: SW8 041122-A.nov04 REVIEWER: L. Lewis
Pond A
PROJECT NAME: Deppe Asphalt Plant DATE: 08-Dec-04
Receiving Stream: Starkey's Creek Class: C
Drainage Basin: White Oak Index No. WOK01 20-10
Site Area 11.01 acres
Drainage Area 244790.40: ; square feet Area in Acres 5.62
IMPERVIOUS AREAS Rational C
Building 650.00 square feet
Asphalt Paving 184994.00 square feet
SW square feet
Future square feet
square feet
square feet
TOTAL :';:;1:;8564;:f square feet Rational Cc= 0.05
SURFACE AREA CALCULATION
% IMPERVIOUS
75.84%
SA/DA Ratio
5.41 %
Des. Depth
5
Req. SA
13240 sf
TSS:
90
Prov. SA
> #5 54> sf
VOLUME CALCULATION
Rational ?*
Des. Storm
:::<:1C11=
.......................................
inches
Rv=
0.733
Bottom
33 msl
Perm. Pool
38 Of. msl
Design Pool
39 msl
Storage met @elev 38.90 msl
Req. Volume
cf
cf
Vol. Prov. at DP
...:.......::153
cf
ORIFICE CALCULATION
" place a "1" in the box if Rational is used
FOREBAY
Perm. Pool Volume=
34373
Req. Forebay Volume=
6874.6
Provided Volume=
8462.00
*Percent=
;.4 fi°70.......
* Forebay depth = pond depth
Elevation Area
Inc. Vol. Acc. Vol.
38.00 15750.00
39.00 17556.00
16653.00 16653.00
Avg. Head =
0.48
ft
Q2 Area =
3.74
sq. inches
Flow Q2, cfs
0.086
cfs
Q5 Area =
1.49
sq. inches
Flow Q5, cfs
0.035
cfs
Orifice Area
2.36
sq. inches
No. of Orifices
>>>;
Q=
0.055
cfs
Diameter, inches
I .a6
weir H x W
in
x
m
Drawdown =
3 2
days
Surface Area a�DP
=
17556 sq. ft.
Falling Head Drawdown =
4.9 days
COMMENTS
Surface Area , Volume and Orifice are within Design Guidelines

WET DETENTION POND ANALYSIS
FILE NAME: S:IWQSIPOND1041122-B.nov04.WK1
PROJECT #: SW8 041122-B.nov04 REVIEWER: L. Lewis
Pond B
PROJECT NAME: Deppe Asphalt Plant DATE: 08-Dec-04
Receiving Stream: Starkey's Creek Class: C
Drainage Basin: White Oak Index No. WOK01 20-10
Site Area 11.01 acres
Drainage Area 2349 L ft0 square feet Area in Acres 5.39
IMPERVIOUS AREAS Rational C
Building 0.00 square feet
Asphalt Paving 186343.00 square feet
SW square feet
Future square feet
square feet
square feet
TOTAL ' 18fi33 00;, square feet Rational Cc= 0.04
SURFACE AREA CALCULATION
% IMPERVIOUS
79.32%
SAIDA Ratio
5.65%
Des. Depth
5
Req. SA
13279 sf
TSS:
90
Prov. SA
:..:.:1:535: sf
VOLUME CALCULATION
Rational ?*
Des. Storm
1>:{7tl>
inches
Rv=
0.764
Bottom
31
msl
Perm. Pool
35 Oft::
msl
Design Pool
37
msl
Storage met @elev 36.92
msl
Req. Volume
1�955
cf
Vol. Prov. at DP
:.........:::.:.:>1.233>
cf
ORIFICE CALCULATION
Avg. Head =
Flow Q2, cfs
Flow Q5, cfs
No. of Orifices
Diameter, inches
Drawdown =
0.48 ft
0.087 cfs
0.035 cfs
weir HxW
days
* place a "1" in the box if Rational is used
FOREBAY
Perm. Pool Volume=
Req. Forebay Volume=
Provided Volume=
*Percent=
34674
6934.8
9258.00
2°la
*forebay depth = pond depth
Elevation Area
Inc. Vol. Acc. Vol.
36.00 15375,00
37.00 17091,00
16233.00 16233.00
Q2 Area = 3.74
sq. inches
Q5 Area = 1.50
sq. inches
Orifice Area 2.36
sq. inches
Q= 0.055
cfs
:... m x
.....::........ in
Surface Area @DP =
17091 sq. ft.
Falling Head Drawdown =
4.8 days
COMMENTS
Surface Area , Volume and Orifice are within Design Guidelines