SW6190602_Engineering Calculations (Volume Needed)_20190619

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Edgerton Industrial Park Pond #1 Required Storm Volume
slutions
*civi�lengineering I land surveying
Wet Pond
Drainage Area:
17.1 acres
Impervious Area: 559077 sf (12.83 ac)
% Impervious: 75%
1 inch Storm Event:
Rv = 0.05+0.009 1
Rv = runoff coefficient
1= percent impervious
Rv=0.05+0.009*75%
= 0.725
For volume that must be controlled:
Volume=3,630*Rd*Rv*A
Volume = 3,630*(1 inch)*(0.725)*17.1 acres = 45,003 cf
SA/DA ratio is 2.72 for a depth of 3 feet
Required surface area = 17.1 ac * (0.0272) = 0.465 ac or 20,261 sf
Surface area provided = 32,615 sf
409 Chicago Drive, Suite 112, Fayetteville, NC 28306
office 1 910-426-6777 fax [phone] license number I C-2354
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