With the growing importance of water resources in recent years, problems in Hydrology, especially water and solute transport in soils, have become more and more important. While this transport behavior is well understood for lab experiments, modelling at field-scale is still problematic. One major difficulty is that the parameters that drive the numerical hydrology models are not easily accessible by measurements. In my diploma thesis, the use of geophysical methods, in particular Electrical Resistivity Tomography (ERT) to obtain transport parameters was studied. The interface between Geophysics and hydrological models was realized by inverse methods, and a new integrated approach was devised to overcome ERT ambiguities.