SW6230705_Design Calculations_20230831 (31)

SERENTIY
SCM#15
SCS curve number
Hydraulic Soil Group: A
Area SCS CN
Building(sf) 190,000 98
Sidewalk(sf) 23,771 98
Pavement(sf) 75,097 98
Pond(sf) 20,000 98
Open space(sf) 394,169 49
Offsite-open space(sf) 0 49
Offsite-impervious(sf) 0 98
Total(sf) 703037 71
Total(ac) 16.14
Rational Coefficient
Pre-development Post-development
Area C Area C
Building(sf) 0.95 Building(sf) 190,000 0.95
Sidewalk(sf) 0.95 Sidewalk(sf) 23,771 0.95
Pavement(sf) 0.95 Pavement(sf) 75,097 0.95
Open space(sf) 721,945 0.30 Pond(sf) 20,000 0.95
Offsite-open space(sf) 0.40 Open space(sf) 394,169 0.30
Offsite-impervious(sf) 0.95 Offsite-open space(sf) 0 0.30
Offsite-impervious(sf) 0 0.95
Total(sf) 721945 0.30
Total(ac) 16.57 Total(sf) 703037 0.59
Total(ac) 16.14
01 Coefficient-15.xls Printed 7/7/2023