Groundwater, Darcy & Well Drawdown

Worked: a supply well in an unconfined aquifer

K = 50 ft/day. Observation wells 50 ft and 200 ft away show saturated thicknesses of 80 ft and 86 ft at steady state. Q = π × 50 × (86² − 80²)/ln(200/50) = π × 50 × 996/1.386 = 112,900 ft³/day = 1.31 cfs, about 590 gpm.