The water-yield model BROOK was used to predict the soil water content in Alptal (Canton Schwyz), as weil as the build-up and the melting of the seasonal snowcover. The simulated soil water content was compared with lysimetric data and field measurements. The accuracy of the snow modelling was tested by comparing the simulated snow water equivalents with the monitored snow water equivalents at four measurement points - two forested and two in the open land. In addition, the simulated meltwater runoff of the whole catchment was compared with the measured runoff at the gauging station.