Given a 28-acre watershed with the following land use mix: 8 acres of SFR (38% impervious)...

Given a 28-acre watershed with the following land use mix: 8 acres of SFR (38% impervious) on HSG-B soils, 5 acres of SFR (30% impervious) on HSG-C soils, and 15 acres of open space (park and playground) in fair condition on HSG-C soils. Watershed time of concentration is 21 minutes. The design return period 24-hour rainfall depth is 5.25 inches.

The runoff-weighted average curve number (CN) =
The area-weighted unit hydrograph peak rate factor (PRF) =

c) The runoff volume from a rainfall of 3.25 inches (watershed inches) =

d) The runoff volume from a rainfall of 0.47 inches (watershed inches) =

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Ally Wells answered 4 months ago

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