Well Hydraulics and Groundwater

Using Sichardt's empirical formula $R = 3000 s_w \sqrt{K}$ (where drawdown $s_w$ is in meters and hydraulic conductivity $K$ is in m/s), for a pumping well with drawdown $s_w = 4.0\text{ m}$ in an aquifer with $K = 0.0001\text{ m/s}$ (so $\sqrt{K} = 0.01$), the radius of influence $R$ in meters is: