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_______ is defined as the percentage of rain water in the form of runoff.

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_______  is defined as the percentage of rain water in the form of runoff.

(a) Storm water flow

(b) Coefficient of permeability

(c) Impermeability factor

(d) Coefficient of consolidation

I got this question during an online exam.

My question is from Rational Method topic in division Water Supply for Building, Collection and Conveyance of Sewage, Waste Water Flow Rate of Environmental Engineering

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Right choice is (c) Impermeability factor

To elaborate: Impermeability factor is defined as the percentage of rain water in the form of runoff. The storm water flow depends on the imperviousness of the surface and if it is more, more runoff takes place.

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