$46$ Drawdown at a $0\mathrm{.}20-$m$-$diameter, fully penetrating well, which has been pumping at the rate of $1,000\frac{m^3}{?}$ day for a long enough time that steady$-$state conditions have been reached, is determined to be $0\mathrm{.}70m.$ The aquifer is unconfined and $10\mathrm{.}0m$ thick. An observation well $10m$ away has been drawn down by $0\mathrm{.}20m.$ Determine the hydraulic conductivity of the aquifer.