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Hydrology & Irrigation

Method of Superposition

A 2 hr - unit...

Question

A 2 hr - unit hydrograph has a base period of 6 hr. The base period of 8 hr unit hydrograph is

A

1

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B

14

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C

12

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D

8

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Solution

The correct option is C 12
Now since
$∴ T = n \times D$
$8 = n \times 2$
n = 4
$∴ t_{B}^{'} = t_{B} + (n - 1) D$
Here
$t_{B} = 6 h r$
n = 4
D = 2hr
$t_{B}^{'} = 6 + (4 - 1) \times 2$
= 12 hr

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