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Hydrology & Irrigation

Runoff Produced by Uniform Rainfall

A 6 hour stor...

Question

A 6 hour storm has 6 cm of rainfall and the resulting runoff was 3 cm. If $ϕ - i n d e x$ remains at the same value, which one of the following is the runoff due to 12 cm of rainfall in 9 hours in the catchment?

A

4.5 cm

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B

6.0 cm

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C

7.5 cm

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D

9.0 cm

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Solution

The correct option is C 7.5 cm
$ϕ - i n d e x = \frac{6 - 3}{6} = 0.5 c m / h r Infiltration for 9 hour rainfall = 9 \times 0.5 = 4.5 c m Runoff due to 12 cm rainfall = 12 - 4.5 = 7.5 c m$

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