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Irrigation Engineering

Irrigation Engineering
According to Khosla’s theory, the exit gradient in the absence of a downstream cutoff is

unity
very large
infinity

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Irrigation Engineering
If average particle size of the silt in millimeters is m, the Lacey's silt factor f is proportional to

m3
m1/3
m2/3
m1/2

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Irrigation Engineering
If the straight sides of a triangular section of a lined canal with circular bottom of radius D, make an angle ? with horizontal, the hydraulic mean depth is

D/5
D
D/2
D/3

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Irrigation Engineering
The minimum size of stone that will remain at rest in a channel of longitudinal slope S and hydraulic mean depth R is given by

11RS
7RS
15 RS
4RS

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Irrigation Engineering
Canals constructed for draining off water from water logged areas, are known

Contour canals
Drains
Valley canals
Inundation canals

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Irrigation Engineering
Useful soil moisture for plant growth, is

Hygroscopic water
Capillary water
Chemical water
Gravity water

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