SW6220501_Design Calculations (Curve Number)_20220621

SOUTHVIEW PARK
WET POND
SCS curve number
Hydraulic Soil Group: A
Area SCS CN
Building (sf)
31,720
98 3965sf per lot
Sidewalk (sf)
3,716
98
Pavement (sf)
14,979
98
Pond (sf)
7,917
98
Open space (sf)
40,094
49
Offsite -open space (sf)
0
49
Offsite -impervious (sf)
14,609
98
Total (sf)
113035
81
Total (ac)
2.59
Rational Coefficient
Pre -development
Post -development
Area
C
Area
C
Building (sf)
0
0.95
Building (sf)
31,720
0.95
Sidewalk (sf)
0
0.95
Sidewalk (sf)
3,716
0.95
Pavement (sf)
0
0.95
Pavement (sf)
14,979
0.95
Open space (sf)
113,035
0.30
Pond (sf)
7,917
0.95
Offsite -open space (sf)
0
0.40
Open space (sf)
40,094
0.30
Offsite -impervious (sf)
0
0.95
Offsite -open space (sf)
0
0.30
Offsite -impervious (sf)
14,609
0.95
Total (sf)
113035
0.30
Total (ac)
2.59
Total (sf)
113035
0.72
Total (ac)
2.59
1722 Runoff coefficient.xls Printed 6/21/2022