A culvert is designed for a peak flow Q_p on the basis of rational formula. If a storm of the same intensity as used in design but of duration twice larger occurs, then the resulting peak discharge will be

Question

Question

This question was previously asked in

BPSC AE Paper 6 (Civil) 11 Nov 2022 Official Paper

Answer 1

Explanation:
Rational method:
According to the Rational method, the stormwater or runoff is defined by
\(Q=K\times A\times I\times R\)

where Q is expressed in liter per second,

'K' i a constant,

'A' is the catchment area in hectares,' I' is the impermeability factor

and 'R' is the intensity of rainfall in mm per hour.'

There is no term for duration of rainfall in the rational formula. So peak discharge will not change.