Irrigation Engineering
Effective precipitation for a crop may be defined as

Total precipitation minus the loss due to evaporation
Total precipitation minus the loss due to infiltration
Available water stored in soil within root zone of the crop
Total precipitation during the crop period

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Irrigation Engineering
An artesian aquifer is the one where

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

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