19970656 Ver 1_Staff Comments_19980203

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Project No. DWQ 970656
Project Name: Partners Equity-Factory Stores of America
DESIGN PARAMETERS:
ELEVATIONS
Bottom of Basin ( 130
Permanent Pool (ft 134
Temporary Pool (f 136.5
AREAS
Permanent Pool S 52500
Drainage Area (ac) 46
Impervious Area ( 34.5
VOLUMES
CALCULATION OF DESIGN REQUIREMENTS:
% Impervious: 75.0%
Permanent Pool Depth:
Temporary Pool Depth:
Required Surface Area:
Permanent Pool (c 0 equired Temporary Pool:
Temporary Pool (c 148104
Forebay (cu ft) 0 Drawdown Rate:
HER PARAMETERS
SA/DA 2.36 Draw-Down Time:
Orifice Diameter ( 4
4.0 ft. ok
2.5 ft. -
47289 sq. f ok
121061 cu. f ok
0.47 cfs -
3.6 days ok
Forebay: ###### %
#DIV/0!
NOTES:
*This spreadsheet is designed to perform a quick preliminary check of design requirements and should not be considered
a complete evaluation of any project.
*All design parameters entered into this spreadsheet should be verified to be accurate based upon submitted plans and specs.
*This spreadsheet is designed to calculate the draw-down time using the average temporary pool depth and the orifice
equation to estimate the change in driving head over time.
*The correct, not the reported, SA/DA value should be entered into the SA/DA block above.
*For impervious areas that do not fall neatly into the categories provided in table I.1 of the BMP Manual, a linear interpolation
subroutine is provided below. The SA/DA value it computes must be physically entered in the SA/DA space above.