Analysis of the Field Pumping Tests Considering Well Loss and Leakage

The authors developed a formulation and solution for discharge of each aquifer in a multi-layered aquifer-aquitard system including the resistance of a well casing and leakage between each aquifer. Numerical solutions for two field pumping tests are carried out. One is unsteady flow caused by pumping up from a two-layered confined aquifer system. Another is an unsteady flow caused by pumping up from a well in a peddy field area considering leakage through an aquitard.The observed drawdown in a well and seepage rate into a well from each aquifer determined by vertical velocity measurement in a well are in good agreement with predicted results.