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The impermeability factor is also called as ____________

(a) Coefficient of impermeability

(b) Runoff coefficient

(c) Coefficient of permeability

(d) Precipitation factor

This question was addressed to me in my homework.

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

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Best answer
The correct choice is (b) Runoff coefficient

The explanation is: The impermeability factor is also called as runoff coefficient and it includes Kuichling’s impermeability factor and Fruhlings factor.

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