A pumping test was conducted in an unconfined aquifer using a test well penetrating to the underlying impervious stratum at a depth of 60 ft. Two observation wells were located at distances of 60 ft and 360 ft from the main well. Before the test was started, the static water level in all three wells was at a depth of 15.0ft below the ground surface datum. Upon reaching equilibrium conditions after pumping the test well at a rate o( 550 gpm for 2 days, the water level draw downs were measured as 9.1 ft and 2.4 ft in the observation wells at distances of 60 ft and 360 ft, respectively. Calculate the field coefficient of permeability.
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