SW8050902_COMPLIANCE_20050907 (2)

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW /95�d2e;q,
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
ED COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

DETENTION POND ANALYSIS FILE NAME: G:\DATA\WPDATA\WQS\POND1050902.WK1
buildings
gravel
conc. Pavement
TOTAL
SURFACE AREA CALCULATION
% IMPERVIOUS 58.37%
Des. Depth 4
TSS: 90
12500.00 square feet
33434.00 square feet
3679.00 square feet
square feet
square feet
square feet
square feet
0.95
0.85
0.95
iA
0
Rational Cc= 70-.6(
SA/DA Ratio 5.14%
Req. SA 4366 sf
Prov. SA F:':549 sf
VOLUME CALCULATION * place a "1" in the box if Rational is used
Rational ?*
FOREBAY
Des. Storm
ii1p4 inches
Perm. Pool Volume=
12133
Rv=
0.58
Req. Forebay Volume=
2426.6
Bottom
91 msl
Provided Volurne=
2427.00
Perm. Pool
Design Pool
Design SA
1:7
msl
95. . 8 msl
6229 sf
i
�-
Percent=
xp��
Req. Volume
cf
SA @ 5494
6229 6910.00
Prov. Volume689
cf
Elevation= 95
95.8 96.00
ORIFICE CALCULATION
Avg. Head =
0.38
ft
Q2 Area =
1.15
sq. in.
Flow Q2, cfs
0.024
cfs
Q5 Area =
0.46
sq. in.
Flow Q5, cfs;
0.009
cfs
Orifice Area
0.79
sq. in.
No. of Orifices
Q=
0.016
cfs
Diameter, inches
weir H x W
i n
x
in
Drawdown
.. ........
9:
'
days
COMMENTS
Surface Area , Volume and Orifice are within Design Guideline: