Modeling of hydrological drawdown caused by pumping for unconfined, confined, and half-confined aquifers

Simple modeling of hhydrological drawdown for three types of aquifer was conducted. We present the results of the application of the iterative least-squares non-linear Levenberg-Marquardt inversion for the case of unconfined, confined and half-confined aquifer geometries that are usually encountered in the field. The input parameters are the piezometric head, pumping rate, and the initial value of drawdown. Homogeneous assumption of the aquifer thickness and depth are applied. The head drawdown, transmitivity, storativity, and pumping rate are the measured data or responses, whereas the conductivity and acquifer thickness are the sought model parameters.