Irrigation Engineering
Lacey's equation for calculating flood discharge in rivers, is

V = 10.8 R2/3 S1/3
V = 10.8 R1/3 S2/3
V = 10.8 R2/3 S1/2
V = 10.8 R1/2 S1/2

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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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