HomeMy WebLinkAboutSW8000425_COMPLIANCE_20000628STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
El CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
F2 COMPLIANCE EVALUATION INSPECTION
DOC DATE
z;-Y)O(22,�,
YYYYMMDD
DETENTION POND ANALYSIS
FVLE NAME S 1WQSIPOND1000425 WK1
PROJECT # SW8 000425
PROJECT NAME Chisom Storage
Receiving Stream
Drainage Basin
Site Area
Drainage Area
Spring -
Branch -Cape Fear
REVIEWER SAV
DATE 28-Jun-2000
Class C Sw Chlorides nla
Index No /F 9y -(3
2 30 acres
91476 00 square feet needs to be verified
Area in Acres 2 10 acres
IMPERVIOUS AREA Rational C-list beside
each item below in E15 to E20
On -Site Buildings 3484800 square feet
On -Site Streets 3920400 square feet
square feet
square feet
square feet
__ _ _ square feet
TOTAL f 74052.00 Cc= 004
% IMPERVIOUS 80 95% Des Depth 6 0 TSS 90
SURFACE AREA CALCULATION
Rational
SA/DA 4 66%
Req SA 4260 square feet
Prov SA 5880 square feet
_ Ilf Rational is used put a
1" in box E26 If not, leave it blank
[From plan Contours]
VULUML UALUULA i 1UN Herm Fooi voiume= Iduuu
Req Forebay Volume= 3600
Bottom 2200 MSL Provided Volume= 4000
Perm Pool r 2800 MSL Percent= L -_ 22%
Design Pool 2900 MSL
Design SA 6825 square feet Des Storm 1 00 inches
Req Volume �5935 cubic feet Rv= 077857143
Prov Volume v 6353 cubic feet SA @ -
Elevation=
ORIFICE CALCULATION
Avg Head = 0 48 ft
Flow Q2, cfs 0 034 Area, in 1 48
Flow Q5, cfs 0 014 Area, in 0159
No of Orifices 1 Diameter, in 1 00 Areay= 0 785 iC2001011
Q, cfs = 0 018 Drawdown = E W 3 8 days
COMMENTS
Surface Area , Volume and Orifice are within Design Guidelines