Answer: B. Cubic metres per second
Run-off is measured in cubic metres per second.
When the rainfall intensity is more than the soil infiltration capacity, the excess water flows on the ground and reaches nearby rivers and streams. This excess amount of water is called runoff. Run-off is measured in Cubic metres per second.
Run-off in calculated by (Rational Method)
where Q = Peak Runoff rate in metre cube per second
C = Runoff co-efficient
I = Rainfall intensity mm/hr
A = Area of Watershed
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