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Hydrology & Irrigation

Methods of Maximum Flow Calculation-Part-2

An urban area...

Question

An urban area is located in a plain having"average climatic conditions". If impervious area of 7.2 ha has design rainfall intensity of 3 cm/hr then design discharge will be (runoff coefficient = 1, for impervious area)

A

0.6 m^{3}

/s

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B

0.4 m^{3} / s

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C

0.5 m^{3} / s

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D

0.7 m^{3} / s

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Solution

The correct option is A $0.6 m^{3}$ /s
$A = 7.2 h a$
$I = 1$
$R = 3 c m / h r = 30 m m / h r$

$Q = \frac{A I R}{360}$

$= \frac{7.2 \times 1 \times 30}{360}$

$= 0.6 m^{3} / s$

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