Groundwater Wells and Pumps

In an unconfined aquifer with $K = 20\text{ m/day}$, steady heads at radial distances $r_1 = 10\text{ m}$ and $r_2 = 100\text{ m}$ ($\ln(r_2/r_1) = 2.303$) are $h_1 = 15\text{ m}$ and $h_2 = 17\text{ m}$. Here $h_2^2 - h_1^2 = 289 - 225 = 64\text{ m}^2$. The discharge in $\text{m}^3/\text{day}$ is (rounded off to one decimal place):