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 3/sec
(B) 25 m3/sec
(C) 30 m3/sec
(D) 35 m3/sec
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