A I 6-cm-diameter perforated casing is sunk in a sandy stratum a depth of 13 in below the water table to an impervious stratum. Two observation wells were installed at 20 m and 40 in distance from the test well. During steady-state pumping of 2000 liters t minute, the water level In the two wells was lower by 145 and 125 cm. respectively. Determine the coefficient of permeability of the previous stratum.

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