Environmental Engineering Reference
In-Depth Information
WORKSHEET 7. CALCULATION OF RUNOFF VOLUMES (PRV and EDV) FOR CG-2
ONLY
PROJECT:
DRAINAGE AREA:
Total Site Area: acres
Protected Site Area: acres
Managed Area: acres
Total Impervious Area acres
2 Inch Runoff - Multiply Total
Impervious Area by 2 inch
Runoff
Capture
Volume
(ft
3
)
Area
(ac)
Cover Type
Roof
Pavement
Other Impervious
TOTAL:
1 Inch Rainfall -
Cover Type
Area
(sf)
Area
(ac)
Runoff
(in)
Runoff Volumes
(ft
3
)
TOTAL:
1. Total Runoff Capture Volume (ft
3
) = Total Impervious Area (ft
2
) x 2 inch x 1/12
2. PRV (ft
3
) = Total Impervious Area (ft
2
) x 1 inch x 1/12
3. EDV (ft
3
) = Total Impervious Area (ft
2
) x 1 inch x 1/12
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