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Irrigation Engineering

Irrigation Engineering
The main function of a diversion head works of a canal from a river, is

To store water
To raise water level
To control floods
To remove silt

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Irrigation Engineering
The downstream expansion head of a guide bank is extended to subtend an angle at the centre, equal to

30°
90°
60°
45°

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Irrigation Engineering
A fall in a canal bed is generally provided, if

None of these
Designed bed slope exceeds the ground slope
Ground slope is practically the same as the designed bed slope
Ground slope exceeds the designed bed slope

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

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Irrigation Engineering
Under the same conditions, which of the following shapes of water surface will give the highest rate of evaporation ?

convex water surface
independent of shape of water surface
flat water surface
concave water surface

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Irrigation Engineering
An aggrading river is a

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

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