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Irrigation Engineering

Irrigation Engineering
The stream which does not have any base flow contribution is called

None of these
perennial stream
ephemeral stream
intermittent stream

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

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Irrigation Engineering
Vertical drop fall is satisfactory for a height upto

3.5 m
0.5 m
5.0 m
1.5 m

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Irrigation Engineering
A 70% index of wetness means

rain excess of 30%
rain deficiency of 70%
None of these
rain deficiency of 30%

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Irrigation Engineering
Retrogression of the bed level of a river downstream a weir, occurs due to

Increase of the bed level
Less percentage of silt
Soft soil strata
Heavy impact of water

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Irrigation Engineering
Silt excluders are constructed on the

river bed upstream of head regulator
canal bed downstream of head regulator
canal bed upstream of head regulator
river bed downstream of head regulator

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