Irrigation Engineering
The structure constructed to allow drainage water to flow under pressure through an inverted syphon below a canal, is called

Syphon
Super-aqueduct
Super passage
Syphon aqueduct

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Irrigation Engineering
An artesian aquifer is the one where

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

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