3.5.2 A confined aquifer is recharged from an unconfined aquifer through an aquitard as shown in the figure. If the water levels in piezometers A, B, and C are 4.31 m, 4.47 m, and 6.64 m below the ground surface, respectively, determine the permeability of the aquitard. A B C Ground surface Water table Piezometric surface 25 m Unconfined aquifer K=20 m/day Aguiar Leaky Aquifer