Duration of infiltration period, t = (Volume of runoff to be infiltrated (cf) × 12 in/ft3)/(Infiltration area (sf)) × Recharge rate (in/hr)
Basin
infiltration volume (cf)
Basin Surface Area (sf)
Recharge Rate (in/hr)
t (hr)
Surface #1
34901
4231
3.1
31.9
Surface #2
18586
2628
1.05
80.8
Subsurface (TYP)
3080
533
3.25
21.3