EXAMPLE $16.$ A $200mm$ diameter well fully penetraiet confined aquifer of $30m$ depth. For pumpage of $35$ litht second, the steady drawdowns at $100m$ and $300m$ distaiti. from the well are observed as $3\mathrm{.}2m$ and $2\mathrm{.}5m$ respectitifi Estimate the coefficient of permeability in $\frac{m}{d}ay$ at transmissibility of the aquifer in $m^2$ per day.

$($GATE $)$