Irrigation Engineering
An artesian aquifer is the one where

water surface under the ground is at atmospheric pressure
None of these
water is under pressure between two impervious strata
water table serves as upper surface of zone of saturation

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Irrigation Engineering
For designing the venturi head,

All listed here
Length of the throat should be 2.5 times the depth measured to F.S.L. in the main canal
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

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