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Civil Engineering - Irrigation

Exercise : Irrigation - Section 3
21.
V and R are the regime mean velocity and hydraulic mean depth respectively in metres. Lacey's silt factor f is
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Pick up the correct statement from the following
Escapes are essential safety valves in a canal system
The capacity of escapes should not be less than the capacity of the canal at its location
The escapes must lead the surplus water to natural drainages
The escapes are aligned to take advantage of contours of lower values
All the above.
Answer: Option
Explanation:
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23.
According to Kennedy, the critical velocity (V0) in metres in a channel is the mean velocity which keeps the channel free from silting or scouring. Its value is given by (where m is critical velocity ratio and D is the depth of the channel).
Answer: Option
Explanation:
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24.
According to Lacey, depth of scour in a river depends upon the straightness of the reach. If D is the depth of scour in regime flow in a right angled bend, it is
1.25 D
1.50 D
1.75 D
2.00 D
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
The width of a dowla is generally kept between 30 to 60 cm and its height above the road level should invariably be more than
10 cm
20 cm
30 cm
40 cm
Answer: Option
Explanation:
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