3. The stream flows due to three successive storms of 2.9, 4.9 and 3.9 cm of 6 hours duration each on a basin are given below. The area of the basin is 118.8
km2. Assuming a constant base flow of 20 cumec, derive a 6-hour unit
hydrograph for the basin. An average storm loss of 0.15 cm/hr can be assumed.
Time (hr)
0
3
6
9
12
15
18
21
24
27
30
33
Discharge(cumec) 20
50
92
140 | 199 202 204 | 144 | 84.5 45.5 29
20