An unconfined aquifer is homogeneous and isotropic. Given a pumping rate of 2000 m3 /day, a steady-state radial flow in the unconfined aquifer is achieved. The well radius is 15 cm. Groundwater head inside the well is 10 m. Groundwater head 100 m away from the pumping well is 30 m. Calculate groundwater level at 25 m away from the pumping well