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A
confined aquifer of uniform thickness (18 m) is completely penetrated by a
pumping well. After a long period of pumping at the constant rate of 0.3 m3 /s,
the water elevations in the observation wells (r1 = 20 m, r2 = 65 m) are
stabilized. The drawdown measured at the observation wells are, respectively,
16.3 m and 3.4 m. Determine the coefficient of permeability, the drawdown at a
distance of 40 m from the well, and the radius of influence.