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Question

1 h triangular unit hydrograph of a watershed has the peak discharge of 60 m3/s at 10 h and time base of 30h. The ϕindex is 0.4 cm/h and base flow is 15 m3/s

If there is rainfall of 5.4 cm in 1 hour the ordinate of the flood hydrograph at 15th hour is

A
225 m3/s
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B
240 m3/s
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C
249 m3/s
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D
258 m3/s
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Solution

The correct option is B 240 m3/s

Rainfall in 1 h = 5.4 cm
Effective rainfall in 1 h
=5.4ϕ=5.40.4=5 cm

Ordinate of flood hydrograph = 5 [ordinate of UH at 15th hour] + base flow
=5×45+15=240 m3/s

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