SW8020826_COMPLIANCE_20030312

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW �JaC�oZ%
DOC TYPE
❑CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

INFILTRATION BASIN ANALYSIS FILENAME: G:IDATAIWPDATAIWQSIINBASIN1020826.WK1
PROJECT NUMBER: 020826 DATE: 12-Mar-03
PROJECT NAME: Donnie F. King, Jr. Property
DRAINAGE BASIN: Cape Fear REVIEWER: L. Lewis
RECEIVING STREAM: Futch Creek CLASS: SA
Index No.: 18-87-19 If ORW, is site within the 575' AEC?
SITE AREA 1.05 acres DRAINAGE AREA:
IMPERVIOUS AREA CALCULATION
Rational C
BUILDINGS
8894 1
PARKING/ASPHALT
CONCRETE
Offsite
56570 1
TOTAL
654t3a'. C
Place a "1" here if Rational
% IMPERVIOUS, I= 27 $
RV= .05+.009 (I)
ELEVATION OF SEASONAL HIGH WATER TABLE
a18' FEET MSL
REPORTED INFILTRATION RATE
INCHES/HOUR
or 0.000139 FPS
SURFACE AREAS AND ELEVATIONS
Elev. (ft) Area, sq ft
Inc. Volume Acc. Volume
BOTTOM 4 1520
0
0 0
TOP 7.3 3872
8896.8
VOLUME 1 DEPTH 1 DRAWDOWN CALCULATION
DESIGN STORM, INCHES
1;5
DESIGN VOLUME
>,$846 CUBIC FEET
TOTAL VOLUME AVAILABLE
:..:.88968' CUBIC FEET
DEPTH OF RUNOFF
;<::«..<330.'' FEET
TIME TO DRAWDOWN
HOURS MUST BE <120
25 YEAR 24 HOUR STORM NIA
Intensity, i = .33 inches 1 hour
Or=CiA=
0.76 CFS
Op through the bottom of the basin=
0.21 CFS Must be > Or
10 YEAR 10 MIN HIGH INTENSITY EVENT
Intensity, i = 6.3 inches I hour
Volume for 10 yr. 10 min. event =
8657.24 CF < 8896.8 CF
COMMENTS
Volume and drawdown are within Design Requirements.

�Donnie F. King Property
HEA Project No.
111312003
Infiltration Basin
Design Summary
Total Drainage Area = 5.44 acres
Impervious Area = 65,464 square feet
1.50 acres
Lot No.
% in Basin
BUA
Impervious
1
90
4,480
4,032
2
100
4,414
4,414
3
65
4,480
2,912
7
50
4,480
2,240
$
1 100
4,480
4,480
9
100
4,480
4,480
10
60
4,480
2,688
11
50
4,480
2,240
12
50
5,480
2,740
24
1001
4,4801
4,480
22R
1001
8,894
8,894
10tal =1 43,ii00J
Road and Curb Area = 21,864 square feet
Percent Impervious = 27.63 %
Soil Type = Autryviile
infiltration Rate = 6 inlhr 0.15 mlhr
SHWT Elevation = 1.8 feet msl (HA -7)
Closest Surface Water = Futch Creek
Classification by EMC =
Design Storm =
RV Value =
Design Storm Volume =
RECEIVED
JAN 16 2003
DWQ
PROD # Lug UZG,?2(a
SA HQW
1.5 inch
0.30 0.05 + 0.009 x 27.63
8,846 ft3 1.5 x 1112 x 5 x 43,560 x 0.30
250 m3
Base Length = 80.0 feet 24.38 meters
Base Width = 19.0 feet 5.79 meters
Surface Area of Bottom = 1520 ft2 141 m2

Donnie F. King Property
HEA Project No.
111312003
Infiltration Basin
Design Summary
Basin Side Slope W 3
:1
Basin Depth = 3.30
feet
1.01
meters
Storage Length = 99.8
feet
30.42
meters
Storage Width = 38.8
feet
11.83
meters
Surface Area at Storage =
3,872
ftZ
360 m2
Storage Volume Provided =
8,897
W
OK
Min, Base Elev. = 3.79
feet, msl
1.16
meters
Base Elevation = 4.0
feet, msl
1.22
meters
Max. Pool Elev. = 7.30
feet, msl
2.23
meters
Minimum Ground Elevation =
7.29
feet
(HA-7)
Drawdown Time = 11.6
hours
OK
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