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

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Irrigation Engineering
The intensity of irrigation means

Percentage of culturable commanded area to be irrigated annually
Total depth of water supplied by the number of waterings
Percentage of the mean of culturable commanded area and the gross commanded area to be irrigated annually
Percentage of gross commanded area to be irrigated annually

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