Godwin Tract - Godwin Tract volumes required

4D SITE
SOLUTIONS, INC.

ENGINEERING

LAND
SURVEYING

CONSTRUCTION
LAYOUT

GPS SERVICES

LAND
DEVELOPMENT

409 CHICAGO
DRIVE

SUITE 112

FAYETTEVILLE
NC 28306

PHONE
910 426-6777

FAX
910 426-5777

Godwin Tract Required Storm Volume

Infiltration #1

Drainage Area:

10.63 acres

Impervious Area: 205,417 sf (4.72 ac)
% Impervious: 44.4%

1 inch Storm Event:

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

Rv=0.05+0.009*44.4%
= 0.4496

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

Volume = 3,630*(1 inch)*(0.4496)*10.63 acres = 17,349 cf