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Objective Question & Answer

QUESTION

Objective Question

Q.1

The ordinates of a 4 hr Unit Hydrograph of a basin of area 30,000 hectares measured at 1 hour

intervals in m³/sec are 6, 36, 66, 91, 106, 93, 79, 68

If S-curve is derived from the above UH, the ordinate of the S-curve at the end of 6 hr is

A
91 m3 /sec
B
112 m3 /sec
C
129 m3 /sec
D
145 m3 /sec
Answer ( Option C)

129 m3 /sec

Solution

Area = 30,000 Ha                           

Time (hr)

4hr UHG (m3/s)

S-curve additions (m3/s)

S-curve ordinates (m3/S)

0

0

-

0

1

6

-

6

2

36

-

36

3

66

-

66

4

91

0

91

5

106

6

112

6

93

36

129

7

79

66

145
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