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Irrigation Engineering

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

4RS
15 RS
7RS
11RS

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Irrigation Engineering
In case of a trapezoidal notch fall

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

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Irrigation Engineering
For supplying water to rabi crop, kharif crop and sugarcane, the channel is designed for a capacity equal to the greater of the water requirement of

rabi or kharif or sugarcane
rabi and sugarcane or kharif and sugarcane
rabi and kharif or sugarcane
rabi or kharif

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Irrigation Engineering
An aggrading river is a

scouring river
neither silting nor scouring river
silting river
both silting and scouring river

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

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

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Irrigation Engineering
The ratio of the rate of change of discharge of an outlet and parent channel, is known as

Sensitivity
Efficiency
Flexibility
Modular limit

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