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Irrigation Engineering

Irrigation Engineering
Useful soil moisture for plant growth, is

Gravity water
Chemical water
Capillary water
Hygroscopic water

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Irrigation Engineering
In case of a trapezoidal notch fall

Top length of the piers should not be less than their thickness
Splay downstream from the notch section is 22½°
Splay upstream from the notch section is 45°
All listed here

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Irrigation Engineering
The state of the soil when plants fail to extract sufficient water for their requirements, is

Ultimate utilization point
Permanent wilting point
Maximum saturated point
None of these

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Irrigation Engineering
If H and d are the water depth and drop in the bed level at a Sarda fall, the width B of the trapezoidal crest, is given by

B = 0.33 √(H + d)
B = 0.22 √(H + d)
B = 0.44 √(H + d)
B = 0.55 √(H + d)

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Irrigation Engineering
Process of meandering is due to

Relative erodibility of the bed and banks
All listed here
Discharge and hydraulic properties of streams
Sediment load of streams

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Irrigation Engineering
The best unit duration of storm for a unit hydrograph is

one-half of basin lag
equal to basin lag
1 hour
one-fourth of basin lag

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