How much water run off is there per foot of asphalt? (Flooding question).

How much water run off is there per foot of asphalt? (Flooding question).
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answer:Calculating how much storm water runoff leaves your parcel is simply a matter of multiplying the percent impervious surface times either the annual precipitation or amount of an individual storm event. I want to pretend I said that, but I stole it from this PDF So how much does it rain on average in a year is one thing you calculate. You also calculate how much it rains in rare storm events.
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