SW6230603_Design Calculations_20240816 (6)

Aberdeen US 15-501 DG
Infiltration Basin
SCS curve number
Hydraulic Soil Group: A
Area SCS CN
Building(sf) 10,640 98
Sidewalk(sf) 98
Pavement(sf) 23,377 98
Pond(sf) 98
Open space(sf) 28,801 69
Offsite-open space(sf) 69
Offsite-impervious(sf) 3,734 98
Total(sf) 66552 85
Total(ac) 1.53
Rational Coefficient
Pre-development Post-development
Area C Area C
Building(sf) 0.95 Building(sf) 10,640 0.95
Sidewalk(sf) 0.95 Sidewalk(sf) 0.95
Pavement(sf) 0.95 Pavement(sf) 23,377 0.95
Open space(sf) 62,818 0.30 Pond(sf) 0.95
Offsite-open space(sf) 2,709 0.40 Open space(sf) 28,801 0.30
Offsite-impervious(sf) 1,025 0.95 Offsite-open space(sf) 0.30
Offsite-impervious(sf) 3,734 0.95
Total(sf) 66552 0.31
Total(ac) 1.53 Total(sf) 66552 0.67
Total(ac) 1.53
1938-Runnoff coefficient calcs.xls Printed 8/16/2024