Problem $5(10$ Points$)$

For a pumping test of a $8-$m$-$thick confined aquifer shown below, two monitoring wells were

installed within the confined aquifer at distances of $5\mathrm{.}5m$ and $12\mathrm{.}5m$ from the pumping well.

The steady state pumping rate was $0\mathrm{.}2m^3$ per second. The water levels in the monitoring wells

after drawdown are shown in the figure below.

Calculate the permeability of the aquifer.