SW6210501_1736-PIPE CALCS_20210518

1736-Rolling Springs Section 7
*Cross pipe calculations use 25-year storm
intensity
Tc = 4.5 min + 20.3 min = 24.8 min, use 30 min
Kerby: L = 500 ft, s = 0.045, n = 0.4
Kirpich: L = 540 ft, s = 0.02
DA=5.08ac
C = 0.35
1 = 4.34 in/hr
Q = 7.72 cfs
Pipe 2
Tc = 4.5 min + 20.3 min = 24.8 min, use 30 min
Kerby: L = 500 ft, s = 0.045, n = 0.4
Kirpich: L = 540 ft, s = 0.02
DA = 4.70 ac
C = 0.35
1 = 4.34 in/hr
Q = 7.14 cfs