SW8010628_COMPLIANCE_20011102

I
STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW _ _10L-- _
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYM M D D

DETENTION POND ANALYSIS
FILE NAME: S:\WQS\POND1010628.WK1
PROJECT#: SW8 010628
PROJECT NAME: Heatherton Park
REVIEWER: L.Lewis
DATE: 02-Nov-2001
Receiving Stream: Sandy Run Branch Class: SC NSW
Drainage Basin: White Oak Index No. '119-10-1
Site Area - 4,.05 acres
:Drainage Area PFM76-50Wl square feet Area in Acre 3.16
IMPERVIOUS AREAS
Rational C
Buildings
28055.00 square feet 1.00
Parking
38637.00 square feet 1.00
SW
square feet 1.00
square feet
square feet
square feet
TOTAL
square feet Rational Cc= 0.59
SURFACE AREA CALCULATION
% IMPERVIOUS 48.45%
Des. Depth 3.5
TSS: 90
SA/DA Ratio 4.85%
Req. SA 6669 sf
.::....7.4 :�301 sf
Prov. SA .
VOLUME CALCULATION * place a "'I " in the box if Rational is used i
Rational ?*
Des. Storm
X..: ....... ..... .. VIOG.
inches
Rv=
0.49
Bottom
38.25 msl
Perm. Pool
E 41;-,'.76-.jmsI
Design Pool
42.5 rnsl
Design SA
8300 sf
Req. Volume575
cf
Prov. Volume
5899<1cf
ORIFICE CALCULATION
Avg. Head =
Flow Q2, efs.
Flow 05, cfs
No. of Orifices
Diameter, inches
Drawdown =
0.35 ft
0.032 cfs
0.013 cfs
or weir H x W
days
YOUTWEVA
Perm. Pool Volume= 17308
Req, Forebay Volume= 3461.6
Provided Volume= 3682.00
Percent= 2 3%
Q2 Area = 1.64 in'
Q5 Area = 0.66 in 2
Orifice Area 1.48 in'
Q= 0.029 cfs
Lin x .... .. .. .. .. .. ..
COMMENTS
Surface Area , Volume and Orifice are not within Design Guideli
r,

DETENTION POND ANALYSIS
FILE NAME: S:IWQSIPOND1010628.WK1
PROJECT #: SW8 010628
PROJECT NAME: Heatherton Park
REVIEWER: L.Lewis
DATE: 12-Sep-2001
Receiving Stream: Sandy Run Branch Class: SC NSW
Drainage Basin: White Oak Index No. _ _ 19-10-1
Site Area 4.05 acres
Drainage Area [ f176418 OO square feet Area in Acre 4.05
IMPERVIOUS AREAS
Rational C
Buildings 27081.00 square feet 1.00
Parking 30600.00 square feet 1.00
SW 5919.00 square feet 1.00
square feet
square feet
square feet
TOTAL 6.360000 square feet Rational Cc= 0.49
SURFACE AREA CALCULATION
% IMPERVIOUS 36.05%
Des. Depth 3
TSS: 85
SAIDA Ratio 3.04%
Req. SA 5371 sf
Prov. SA 3362' sf
VOLUME CALCULATION * place a "1" in the box if Rational is used
Rational ?*
Des. Storm
.i00'
inches
Rv=
0.37
Bottom
38 msl
Perm. Pool
41 17> msl
Design Pool
42.5 msl
Design SA
4558 sf
Req. Volume
5505
cf
Prov. Volume
='S26T>cf
ORIFICE CALCULATION
FOREBAY .
Perm. Pool Volume=
Req. Forebay Volume=
Provided Volume=
Percent=
N
Avg. Head =
0.58 ft Q2 Area =
1.25 in2
Flow Q2, cfs
0.032
cfs Q5 Area =
0.50 in
Flow Q5, cfs
0.013
cfs Orifice Area
12.57 in
No. of Orifices
Q=
0.320 cfs
Diameter, inches
:; 4 00
or weir H x W in
x in
Drawdown =
0 2
—_
days
--
COMMENTS
Surface Area , Volume and Orifice are not within Design Guideli