SW6200403_1356-Runoff coefficient calcs_4/30/2020

Fayetteville Clinton Road Dollar General
Storm Water Control
SCS curve number
Hydraulic Soil Group :A
Area SCS CN
Building (sf) 9,005 98
Building (sf) 9,005 98 Pavement (sf) 23,909 98
Pavement (sf) 23,909 98 Open space (sf) 35,734 39
Pond (sf) 4,883 98 Offsite -open space (sf) 39
Open space (sf) 34,743 39 Offsite -impervious (sf) 98
Offsite -open space (sf) 39
Offsite -impervious (sf) 98
Total (sf)72540 70
Total (ac)1.67
Rational Coefficient
Predevelopment Postdevelopment
Area C Area C
Impervious (sf) 0.95 Building (sf) 9,005 0.95
Open space (sf) 72,540 0.30 Pavement (sf) 23,909 0.95
Pond (sf) 4,883 0.95
Open space (sf) 34,743 0.3
Offsite -open space (sf) 0.3
Offsite -impervious (sf) 0.95
Total (ac)72540 0.30 Total (ac)72540 0.64
Total (ac)1.67 Total (ac)1.67
1356-Runoff coefficient calcs.xls Printed 4/30/2020