A 3 hour triangular unit hydrograph (UH) has a time base of 30 hours with peak discharge of 90m3/s. For the same catchment 9 hour unit hydrograph was derived using 3 hour UH. The peak of 9 hour UH will
A
75m3/s
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B
50m3/s
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C
90m3/s
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D
30m3/s
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Solution
The correct option is A75m3/s
For same catchment area,
∴Area of UH1=Area of UH2 12×30×90=12×36×QP QP=75m3/s