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Irrigation Engineering

Irrigation Engineering
The most suitable chemical which can be applied to the water surface for reducing evaporation is

Butyl alcohol
Methyl alcohol
Ethyl alcohol
Cetyl alcohol

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Irrigation Engineering
The best unit duration of storm for a unit hydrograph is

equal to basin lag
one-fourth of basin lag
1 hour
one-half of basin lag

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Irrigation Engineering
Unit of runoff in M.K.S. system is

metre/sec
square metre
cubic metre
cubic metre/sec

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Irrigation Engineering
If V₀ is the critical velocity of a channel, its silt transporting power, according to Kennedy, is proportional to

V₀1/2
V₀7/2
V₀5/2
V₀3/2

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Irrigation Engineering
Bed bars in a canal are provided

To watch the general behavior of canal
To raise the supply level
To measure the discharge
To control the silting

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Irrigation Engineering
The ratio of the discharge over a trapezoidal crest to a rectangular crest of Sarda falls of identical parameters, is

1.084
1.074
1.064
1.054

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