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Irrigation Engineering

Irrigation Engineering
Wetted perimeter of a regime channel for a discharge of 64 cumecs as per Lacey’s theory will be

91m
38m
15m
19m

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Irrigation Engineering
Lacey's equation for calculating flood discharge in rivers, is

V = 10.8 R2/3 S1/3
V = 10.8 R2/3 S1/2
V = 10.8 R1/3 S2/3
V = 10.8 R1/2 S1/2

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Irrigation Engineering
V and R are the regime mean velocity and hydraulic mean depth respectively in meters. Lacey's silt factor f is

3V²/4R
2V²/√3 R
5V²/2R
2V²/5R

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Irrigation Engineering
In a concrete canal the approximate permissible velocity of water should not exceed

2 m/sec
1 m/sec
0.5 m/sec
1.5 m/sec

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Irrigation Engineering
In North Indian Plains, optimum depth of kor watering for wheat, is

13.5 cm
17.5 cm
19.0 cm
23.0 cm

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Irrigation Engineering
Vertical drop fall is satisfactory for a height upto

1.5 m
3.5 m
5.0 m
0.5 m

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