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A tube-well of $20\text{ cm}$ diameter fully penetrates a horizontal, homogeneous and isotropic confined aquifer of infinite horizontal extent. The aquifer is of $30 \text{ m}$ uniform thickness. A steady pumping at the rate of $\text{40 litres/s}$ from the well for a long time results in a steady drawdown of $4\text{ m}$ at the well face. The subsurface flow to the well due to pumping is steady, horizontal and Darcian and the radius of influence of the well is $245\text{ m}$. The hydraulic conductivity of the aquifer (in $\text{m/day}, \textit{round off to integer}$) is ________________
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