TN-18 : Parameterization of hydrogeological factors in groundwater study

Abstract

Walton has presented a relationship of transmissivity with specific capacity for wells having negligible storage. These graphs are used for estimation of transmissivity provided storage coefficient is known a priori. In the present report similar graphs have been presented considering well storage and variation of pumping rate with drawdown. The following cases have been considered: Case 1 - the pumping rate is independent of drawdown and is constant, Case 2-the pumping rate is a linear function of drawdown.

Using discrete kernel approach a set of type curves for a two aquifer system separated by an aquiclude has been presented. Use of the type curves for parameter estimation has been demonstrated using synthetic drawdown data. It has been shown that these type curves can provide a fairly accurate means for determining transmissivity and storage coefficient of individual aquifer from pump test data conducted in a well open to two aquifers.