Irrigation Engineering
The useful moisture of soil, is equal to its

Field capacity
Difference between filed capacity and permanent wilting point within the root zone of plants
Moisture content at permanent wilting point
Saturation capacity

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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
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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