SW6210101_1729 Runoff coefficient_20210204

Grays Creek Safe Storage
Infiltration Basin
SCS curve number
Hydraulic Soi Group :A
AreaSCS CN
Building (sf)59,85798
Sidewalk (sf)45898
Pavement (sf)53,72798
Open space (sf)049
Offsite -open space (sf)25,52649
Total (sf)13956889
Total (ac)3.20
Rational Coefficient
Pre-developmentPost-development
AreaCAreaC
Building (sf)00.95 Building (sf)59,8570.95
Sidewalk (sf)00.95 Sidewalk (sf)4580.95
Pavement (sf)00.95 Pavement (sf)53,7270.95
Open space (sf)139,5680.30 Open space (sf)00.30
Offsite -open space (sf)00.40 Offsite -open space (sf)25,5260.40
Total (sf)1395680.30Total (sf)1395680.85
Total (ac)3.20Total (ac)3.20
1729 Runoff coefficient.xlsPrinted 2/4/2021