Samenvatting

To simulate complex three-dimensional groundwater flow problems as well as to perform pre- and postprocessing on input and output data a software package is necessary. In recent years, RIVM has built such a set called METROPOL, which has been applied succesfully for a number of situations. The next sections describe this software package. The mathematical background is given in several more detailed reports. The quality of the programme is currently being studied by comparing with analytical solutions, results of other programmes and by simulation of laboratory and field experiments.