Question

A well is constructed in a confined aquifer. The aquifer has a uniform thickness of 50 ft overlain by a aquitard and the bottom is 115 ft below ground surface (bgs). A pumping test weas used to determine the hydraulic conductivity of the aquifer. The initial piezometric (potentiometric) surface of the confined aquifer was 49 ft bgs at the pumping well and the observation wells. After water was pumped at a rate of 0.46 cu ft/sec for several days, the water levels in the wells stabilized with the following drawdown levels: 21.0 ft at the pumping well, 12.1 ft at observation well 1 (30 ft from the pumping well), and 7.9 ft at observation well 2 (100 ft from the pumping well). Estimate:

1. The hydraulic conductivity of the aquifer.

2. The pumping rate required to create a drawdown to the physical top of the confined

   aquifer. Assume the pumping well radius is 1 ft, and that the cone of depression extends to 700 ft, at this pumping rate.

Answer 1