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Irrigation Engineering

Irrigation Engineering
The depth of rice root zone, is

50 cm
80 cm
90 cm
60 cm

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Irrigation Engineering
The uplift pressure on the roof of an inverted syphon, is maximum when

Canal is running dry
Drain in running dry
Canal is running with F.S.L.
Drain is running with H.F.L.

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Irrigation Engineering
Which of the following is a flexible outlet ?

submerged pipe outlet
Gibb’s outlet
None of these
Kennedy’s gauge outlet

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

6 cumecs
20 cumecs
14 cumecs
10 cumecs

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Irrigation Engineering
If H and d are the water depth and drop in the bed level at a Sarda fall, the width B of the trapezoidal crest, is given by

B = 0.22 √(H + d)
B = 0.33 √(H + d)
B = 0.44 √(H + d)
B = 0.55 √(H + d)

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Irrigation Engineering
River training for depth is achieved by

both (A) and (B)
groynes
construction of dykes or leavees
groynes and bandalling

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