HomeMy WebLinkAboutSW8020819_COMPLIANCE_20030423STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
❑CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE'
COMPLIANCE EVALUATION INSPECTION
DOC DATE
WWMMDD
DETENTION POND ANALYSIS FILE NAME: G:IDATAIWPDATAIWQSIPOND1020819.WK1
PROJECT #: SW8 020819 REVIEWER: L. Lewis
PROJECT NAME: Dollar General -Castle Hayne
DATE:
23-Apr-03
Receiving Stream:
Prince George Creek
Class:
C Sw
Drainage Basin:
Cape Fear
Index No.
18-74-53
Site Area
6.90 acres
�
Drainage Area
2407:47 Oil':
square feet
Area =
acres
Offsite =
12240.00 so. ft.
IMPERVIOUS AREAS
Rational C
Buildings 16735.00 square feet
Parking 38173,00 square feet
SW 2386,00 square feet
Future 66940.00 square feet
Offsite square feet
square feet
TOTAL f24234<OD', square feet Rational Cc= 0.10
SURFACE AREA CALCULATION
% IMPERVIOUS
51.60%
SAIDA Ratio
2.81 %
Des. Depth
6
Req. SA
6770 sf
TSS:
90
Prov. SA
:8787: sf
VOLUME CALCULATION
Rational ?*
Des. Storm..a0'<<
inches
Rv=
0.51
Bottom
6.5 msl
Perm. Pool
10sl
'€ m
Design Pool
14.5 msl
Design SA
11129 sf
ORIFICE CALCULATION
* place a "1" in the box if Rational is used
FOREBAY
Perm. Pool Volume=
Req. Forebay Volume=
Provided Volume=
Percent=
SA @ _
Elevation=
30561
6112.2
6038}}.400//
Avg. Head =
0.72 ft
Q2 Area =
2.11
sq. in.
Flow Q2, cfs
0.060 cfs
Q5 Area =
0.84
sq. in.
Flow Q5, cfs
0.024 cfs
Orifice Area
1.77
sq. in.
No. of Orifices
1f
Q=
0.050
cfs
Diameter, inches
1.5Ci
weir H x W
::
in
x
in
Drawdown =
2';
days
COMMENTS
Surface Area , Volume and Orifice are within Design GuidelineE