SW6210101_1729 Volumes Required_20210330

GCSS Required Storm Volume

Infiltration Basin #1

Drainage Area:

3.20 acres 139,568 sf

Impervious Area: 114,042 sf (2.61ac)
% Impervious: 81.7%

1 inch Storm Event:

Rv = 0.05+0.009 I
Rv = runoff coefficient
I= percent impervious

Rv=0.05+0.009*81.7%
= 0.7853

For volume that must be controlled:
Volume=3,630*Rd*Rv*A

Volume required = 3,630*(1 inch)*(0.7853)*3.20acres = 9,122cf

Volume provided = 12,683 cf