SW8000720_COMPLIANCE_20000921

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. sw Sb.YT07a O
DOC TYPE ❑CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
— COMPLIANCE EVALUATION INSPECTION
i DOC DATE- I �y3��Qo2
YYYYMMDD

DETENTION POND ANALYSIS
FILE NAME: S:1WQSIPOND1000720.WK1
PROJECT #: SW8 000720
PROJECT NAME: Cornerstone Baptist Church
REVIEWER: SAV
DATE: 21-Sep-2000
Receiving Stream: Smith Creek Class: C Sw, Chlorides: nla
Drainage Basin: Cape Fear Index No. 18-74-63
Site Area 3.00 acres
Drainage Area30680 00; square feet needs to be verified
Area in Acres 3.00 acres
IMPERVIOUS AREA Rational C-list beside
each item below in E15 to E20
On -Site Buildings 10790.00 square feet
On -Site Parking 41340.00 square feet
On -Site Sidewalks 2000.00 square feet
square feet
square feet
square feet
TOTAL �5413000 Cc= 0.12
% IMPERVIOUS 41.42% Des. Depth 4.1 TSS: 90
SURFACE AREA CALCULATION
Rational ?
SAIDA 3.53%
Req. SA 4613 square feet
Prov. SA „4620 square feet
VOLUME CALCULATION
Bottom
42.80 MSL
Perm, Pool
4690MSL
Design Pool
48.00 MSL
Design SA
5675 square feet
Req. Volume 4604:1 cubic feet
Prov. Volume 5662' cubic feet
ORIFICE CALCULATION
If Rational is used put a
"1" in box E26. If not, leave it blank.
[From plan Contours]
Perm. Pool Volume= 7100
Req. Forebay Volume= 1420
Provided Volume= 1420
Percent= _ _ _000A
Des. Storm :.... . 100' inches
Rv= 0.42279614
SA @ _
Elevation=
Avg. Head = 0.53 ft
Flow Q2, cfs 0.027 Area, in' 1.10
Flow Q5, cfs 0.011 Area, in' 0.44
No. of Orifices 1,' Diameter, in ::1 OQ,'� Area =
Q, cfs = 0.019 Drawdown =
COMMENTS
Surface Area , Volume and Orifice are within Design Guidelines.
0.785 in
days