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Irrigation Engineering

Irrigation Engineering
A raingauge should preferably be fixed

in a closed space
near the building
under the tree
in an open space

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Irrigation Engineering
If d1 is the depth of cutting, d2 is the height of the bank from bed level r2 : 1 and r1 : 1 are the slopes in filling and cutting respectively, the horizontal distance n between the bed and bank, is

x = r2 d2
x = d1 / r1
x = r1 d1
x = d2 / r2

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

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Irrigation Engineering
The amount of irrigation water required to meet the evapotranspiration needs of the crop during its full growth is called

consumptive irrigation requirement
consumptive use
net irrigation requirement
effective rainfall

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

2.0 D
2.5 D
1.2 D
1.5 D

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Irrigation Engineering
The sensitivity of a rigid module is

1
infinity
between zero and one
zero

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