SW1200501_Calcs (Design Volume) (2)_20201109

1 of 1
Total
101495101495
Whole Site Area (sf)
Post-Development
Built Upon Area Summary (sf)
Impervious (Proposed Road)Impervious (Existing)Total
4046
1499419040
10/28/2020
Runoff coefficient \[(storm runoff (in)/ storm rainfall(in)\] unitlessImpervious Fraction \[impervious portion of drainage area (ac)/ drainage area (ac)\], unitlessVolume of Runoff for
the design storm (cf)Design storm rainfall depth (in)Watershed area (acres)
0.187
0.2183
cu.ft.
1
2.33
1847
NCDEQ Stormwater Design ManualSection B, Simple Method for Runoff Volume0.05+0.9*Ia =DA-IMP/DA19040/101495=3630 * Rd * Rv * A
Stormwater Runoff Volume Calculation - Bio Cell #2Reference:Simple Method (Proposed Conditions)Rv =Ia =V=Rd =A =V min. =
P:\\2019\\19.00154-BuncombeBOE-Fairview Elem Car Rider Lane\\Design\\Calcs\\Stormwater\\20-1030 Resubmittal\\Simple Method Runoff Volume-Cell 2_10-28-20