Irrigation Engineering
Effective precipitation for a crop may be defined as

Total precipitation minus the loss due to infiltration
Total precipitation minus the loss due to evaporation
Total precipitation during the crop period
Available water stored in soil within root zone of the crop

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Irrigation Engineering
A water-logged land is found suitable for cultivation due to

Absence of aeration of soil from root zone of the plant
None of these
Regular supply of water to plants from the water table by capillary action
Ease of tillage for preparation of the field for optimum condition of germination

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Irrigation Engineering
For designing the venturi head,

Minimum throat width should not be less than 60 cm
Width of the throat should not be less than one-third of the bed width of main canal
Length of the throat should be 2.5 times the depth measured to F.S.L. in the main canal
All listed here

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