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Irrigation Engineering

Irrigation Engineering
The water utilizable by plants is available in soils mainly in the form of

gravity water
chemical water
hydroscopic water
capillary water

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Irrigation Engineering
For diversion of flood water of rivers, the type of canal constructed, is

Inundation canal
Perennial canal
Canal
Ridge canal

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Irrigation Engineering
If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be

1 – (0.9)°l0
1/(1+ 0.9010)
1/(1-0.9°10)
1 + (0.9)010

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Irrigation Engineering
A runoff river plant is

a high head scheme
a medium head scheme
a low head scheme
None of these

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Irrigation Engineering
Regime conditions in a channel may occur if

Channel flows uniformly in incoherent alluvium as that transported in suspension
Silt grade and silt charge are constant
Discharge is constant
All listed here

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Irrigation Engineering
According to Kennedy, the critical velocity (V₀) in meters 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).

V₀ = 0.55 mD0.54
V₀ = 0.84 mD0.64
V₀ = 0.55 mD0.64
V₀ = 0.84 mD0.54

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