Irrigation Engineering
Effective precipitation for a crop may be defined as

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

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Irrigation Engineering
For designing the venturi head,

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

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