SW8000526_COMPLIANCE_20000921

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW ROQ, ov
DOC TYPE
❑CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
�J0�2I
YYYYMMDD

DETENTION POND ANALYSIS
PROJECT#: SW8 000526
PROJECT NAME: Expostar Portable Displays
Receiving Stream: Smith Creek
Drainage Basin: Cape Fear
FILE NAME: S:1WQS\POND1000526.WK1
REVIEWER: Lewis
DATE: 21 -Sep-2000
Class: C—SW Chlorides: n/a
Index No. 18-74-63
Site Area 1.79 acres
Drainage Area square feet needs to be verified
Area in Acres 1.79 acres
Building 19167.00 square feet
Parking 27878.00 square feet
SW 1307.00 square feet
square feet
square feet
square feet
TOTAL 7
% IMPERVIOUS 62.01%
RFACE AREA CALCULATION
Rational C-list beside
each item below in Ell 5 to E20
Cc=
Des. Depth 6.0 TSS
0.08
90
Rational ? If Rational is used put a
SA/DA 3.50% "1" in box E26. If not, leave it blank.
Req. SA 2729 square feet
Prov. SA feet [From plan Contours]
VOLUME CALCULATION
Perm. Pool Volume= 18437
Req, Forebay Volume= 3687.4
Bottom
46.00
MSL
Provided Volume= 3702
Perm. Pool
MSL
Percent=
Design Pool
52.70
MSL
Design SA
6419
square feet
inches
Des. Storm 100
Req. Volume
......... cubic feet
Rv= 0.61
Prov. Volume
cubic feet
SA @
Elevation=
ORIFICE CALCULATION
Avg. Head =
0,33
ft
Flow Q2, cfs
0.023
Area, in 2
1.19
Flow Q5, cfs
0.009
Area, in 2
0.48
No. of Orifices
Diameter, in.
Area = 0.785 in2
Q, cfs =
0.015
Drawdown = 3 0 days
COMMENTS
Surface Area , Volume and Orifice are within Design Guidelines