DETENTION CALCULATION SHEET
Name of development | |
Weighted C Value (A) | |
Maximum Allowable Discharge (B) | cfs |
Development Area (C) | Acres |
Storm Recurrence Interval | 25 Year |
Time (hour) (D) | Rainfall inch/hour (E) | I*C (E)*(A) (F) | Outlet CPS/ac (B) | Inflow (F)-(B) (G) | Storage (G)/12 (H) | Required Storage (D)*(C)*(H) |
Time (hour) (D) | Rainfall inch/hour (E) | I*C (E)*(A) (F) | Outlet CPS/ac (B) | Inflow (F)-(B) (G) | Storage (G)/12 (H) | Required Storage (D)*(C)*(H) |
0.08 | 7.40 | |||||
0.17 | 5.80 | |||||
0.25 | 4.70 | |||||
0.33 | 4.18 | |||||
0.42 | 3.65 | |||||
0.50 | 3.25 | |||||
0.58 | 2.95 | |||||
0.67 | 2.77 | |||||
0.75 | 2.60 | |||||
0.83 | 2.48 | |||||
0.92 | 2.30 | |||||
1.00 | 2.12 | |||||
1.25 | 1.78 | |||||
1.50 | 1.55 | |||||
2.00 | 1.25 | |||||
2.50 | 1.06 | |||||
3.00 | 0.88 | |||||
3.50 | 0.78 | |||||
4.00 | 0.70 | |||||
Maximum Storage Required in far right hand column | Ac-Ft | |||||
Maximum multiplied by 43,560 = Detention Volume Required | CFT | |||||