Estimate what is the total volume of runoff

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It rains 3.0 in. on a 20.0 acre watershed. What is the volume of rainfall excess if 30% of the watershed area is a lake and infiltration on the soil is estimated at 1.0 in? What is the total volume of runoff? Assume that the lake level is low and does not contribute to rainfall excess. Hint: Lakes are treated as initial abstraction.

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