Question

Time:
(hour)
9
212. The ordinates of a 3-hour unit hydrograph
for a small catchment are given below:
Unit graph ordinates:
(m/s)
0
0
3
1.5
6
4.5
18.6
12
12.0
15
9.4
18
4.6
21
2.3
24
0.8
27
0
If the design storm produces net rainfall
depths of 4.6 cm and 3.5 cm in successive
unit periods, and if the base flow is 2 m/s
then the peak flood flow (in m's) will
nearly be
a) 270
b130
c) 90
d) 86
LES 93]​

Answer 1

Explanation:

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Answer 2

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C