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Irrigation Engineering

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

capillary water
hydroscopic water
chemical water
gravity water

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Irrigation Engineering
Main purpose of mean water training for rivers is

All of these
To provide sufficient depth of water in navigable channels, during low water periods
To preserve the channel in good shape by efficient disposal of suspended and bed load
Flood control

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Irrigation Engineering
When surface of transpiration is submerged under water, then potential evapotranspiration is

equal to or less than evapotranspi-ration
much less than evapotranspiration
much more than evapotranspiration
equal to evapotranspiration

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Irrigation Engineering
A river training work is generally required when the river is

Meandering
All of these
Aggrading
Degrading

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Irrigation Engineering
If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor downstream of the crest-wall, is given by the equation

t = (h - 1)/(G + t)
t = (h + 1)/(G + t)
t = (h - 1)/(G - t)
t = (h + 1)/G

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Irrigation Engineering
If D is the depth of water upstream of the throat above its sill, B is the width of the throat, to achieve critical flow in an open venturi flume, the theoretical maximum flow Q, is

Q = 1.71 BD
Q = 1.71 BD3/2
Q = 1.71 BD1/2
Q = 1/71 BD2/3

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