Irrigation Engineering
Generally the weir is aligned at right angles to the direction of the main river current because

It is economical
All of these
It ensures less length of the weir
It gives better discharging capacity

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Irrigation Engineering
An artesian aquifer is the one where

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

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