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Irrigation Engineering

Irrigation Engineering
If D is the depth of scour below original bed, then the width of launching apron is generally taken as

1.2 D
2.0 D
2.5 D
1.5 D

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Irrigation Engineering
The main function of a divide wall is to

control the silt entry in the canal
provide smooth flow at sufficiently low velocity
prevent river floods from entering the canal
separate the undersluices from weir proper

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Irrigation Engineering
In a Sarda type fall, the rectangular crest, may be used for discharge up to

20 cumecs
14 cumecs
6 cumecs
10 cumecs

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Irrigation Engineering
In a barrage, the crest level is kept

High with large gates
Low with no gates
High with no gates
Low with large gates

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Irrigation Engineering
For a flood control reservoir, the effective storage is equal to

useful storage + surcharge storage -valley storage
useful storage – valley storage
useful storage + surcharge storage + valley storage
useful storage + surcharge storage

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Irrigation Engineering
The state of the soil when plants fail to extract sufficient water for their requirements, is

None of these
Ultimate utilization point
Maximum saturated point
Permanent wilting point

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