SW6220101_Design Calculations (Curve Number)_20220119

Woodshire Subdivision Phase 7
Wet Pond
SCS curve number
Hydraulic Soil Group:
B
Area
SCS CN
Lots (sf)
244,000
98
Sidewalk (sf)
15,984
98
Pavement (sf)
107,814
98
Pond area (sf)
12,435
98
Open space (sf)
449,056
69
Offsite -open space (sf)
0
69
Offsite -impervious (sf)
15,963
98
Total (sf)
845252
83
Total (ac)
19.40
Rational Coefficient
Pre -development
Post -development
Area
C
Area
C
Building (sf)
0
0.95
Building (sf)
244,000
0.95
Sidewalk (sf)
0
0.95
Sidewalk (sf)
15,984
0.95
Pavement (sf)
0
0.95
Pavement (sf)
107,814
0.95
Open space (sf)
829,289
0.30
Pond area (sf)
12,435
0.95
Offsite -open space (sf)
0
0.40
Open space (sf)
449,056
0.30
Offsite -impervious (sf)
15,963
0.95
Offsite -open space (sf)
0
0.30
Offsite -impervious (sf)
15,963
0.95
Total (sf)
845252
0.31
Total (ac)
19.40
Total (sf)
845252
0.60
Total (ac)
19.40
1070-Runoff coefficient.xls Printed 1/19/2022