Irrigation Engineering
Lacy's regime condition is obtained if

Silt charge in the channel is variable
Channel flows in unlimited, incoherent alluvium of the same character as that transported material
Silt grade in the channel is variable
Discharge in the channel is variable

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Irrigation Engineering
An artesian aquifer is the one where

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
None of these

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