The peak of a 4 hour flood hydrograph is 240 m3/sec . If the rainfall excess is 80 mm and base flow which is constant is 40 m3/sec, then the peak of 4-hours unit hydrograph will be
A. 20 m3/sec
B. 25 m3/sec
C. 30 m3/sec
D. 35 m3/sec
Answer: Option B
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Peak of direct runoff = 240-40 = 200 m3/sec
Peak of unit hydrograph = 200/8 = 25 m3/sec