ABSTRACT
In previous chapters, we have devoted our attention mainly to fonoard problems (or direct problems, forecast problems). We assume that the mathematical system together with its parameters that govern a physical phenomenon are known. Our task is to solve the system by analytical or numerical means to produce a forecast. For example, the Theis solution is a mathematical system that predicts drawdown in aquifers. The drawdown values are controlled by the physical parameters defining the system, such as transmissivity, storativity, and pumping rate. Given the full set of parameter values, a drawdown forecast over space and time can be made.
