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Irrigation Engineering

Irrigation Engineering
The depth of rice root zone, is

90 cm
80 cm
50 cm
60 cm

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Irrigation Engineering
For a proportional outlet, the flexibility is

greater than 1
zero
between zero and 1
1

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Irrigation Engineering
Variability of rainfall is
i) largest in regions of high rainfall
ii) largest in coastal areas
iii) largest in regions of scanty rainfall
The correct answer is

only (iii)
only (i)
(i) and (ii)
(ii) and (iii)

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Irrigation Engineering
According to Kennedy, the critical velocity (V₀) in meters in a channel is the mean velocity which keeps the channel free from silting or scouring. Its value is given by (where m is critical velocity ratio and D is the depth of the channel).

V₀ = 0.55 mD0.54
V₀ = 0.55 mD0.64
V₀ = 0.84 mD0.64
V₀ = 0.84 mD0.54

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Irrigation Engineering
While deciding the alignment of a proposed canal taking off from a river at B, three alignments of approximately equal lengths are available. These cross a drainages at C1, C2 and C3 where drainage bed levels C1 > C2 > C3, you will provide at site C3

A syphon
A syphon aqueduct
A super passage
An aqueduct

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Irrigation Engineering
A straight glacis type fall with a baffle platform and a baffle wall is called

Vertical drop-fall
Glacis fall
Inglis fall
Montague type fall

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