ABSTRACT
This chapter aims to provide available pumping test analysis of nonlinear flow. Nonlinear flow is seldom, if ever, considered in groundwater movement, except for flow in the immediate vicinity of pumped wells. An interest has arisen for evaluation of the aquifer parameters with nonlinear flow. Traditionally aquifer tests are interpreted on the basis of linear flow through the whole aquifer. Unsteady-state nonlinear flow in confined aquifers during a pumping test was solved by Z. Sen with the Forchheimer flow equation. The term "two-regime flow" has been coined by P. Huyokom and C. R. Dudgeon where a turbulent flow may exist in the immediate vicinity of a well due to either screen resistance or gravel pack material or at high gradients in the aquifer material itself. Aquifer parameter determination from large time-distance-drawdown data in non-Darcian flow can be achieved by straight line matching procedure on semilogarithmic paper.
