Question

1. The runoff data at a stream gauging station for a flood are given below.

The drainage area is 40 km². The duration of rainfall was 3 hours.

Derive the 3-hour unit hydrograph for the basin and plot the same.

State the peak of the unit hydrograph you derive

time (hours)	discharge, Cumsec)
2	50
5	53
8	75
11	120
14	225
17	290
20	270
23	145
2	110
5	90
8	80
11	70
14	60
17	55
20	50
23	50

Answer 1