The peak magnitude of a flood hydrograph during 4-hr study duration over a catchment is 300 m3 / s. The total depth of rainfall is 6 cm; and the infiltration loss during the said 4-hr period is 2 cm. A constant uniform base flow of 20 m3 / s is premised throughout. The peak value of the corresponding 4-hr unit hydrograph is
1
75 m3 / s
2
70 m3 / s
3
50 m3 / s
4
40 m3 / s