Many hydrological and pedological questions require spatial information on soil and landscape water budget. Since financial, temporal as well as human resources are limited, it is common to take measurements only at gauge stations. However, additional measurements at further sites in the catchment area are frequently not performed. In order to achieve more detailed spatial information with a reasonable effort, this study will focus on the development of new measurement routines and evaluation methods. For this reason, a bottom-up approach is employed to conduct investigations on the micro, meso and macro scale and to combine them with each other. Therefore, hydropedological monitoring stations at six representative sites in the region of Westfläming were installed on agricultural and forestry use areas, and measurements were subsequently taken. In addition, hydrological measurements of groundwater levels as well as at the outlet of the river Grimmer Nuthe, the gauge station Strinum, were taken into account. Furthermore, a detailed hydrological modelling with the physically based model WaSiM-ETH was conducted for this catchment area. To allow for comparison, mean annual percolation rates within the administrative region of Westfläming were calculated by applying the basic, empirical TUB-BGR-method. For a successful model application, a plausible spatial-temporal representation of soil moisture is necessary. Consequently, the measured hydrological and hydropedological values were taken into account at all scale levels for calibrating and validating the models used in this study. Key to the investigation was the question how well the measured values complied with the modelled values at the particular monitoring stations and at different scale levels. Hence, the measurements in the catchment area form the data basis and provide a better understanding of the ongoing processes for the model application. By combining different methods and models, a considerable improvement of the model results of WaSiM-ETH was achieved within the catchment area of the Grimmer Nuthe, in particular with respect to the spatial plausibility. It was shown that it does not suffice – nor is it advisable – to solely rely on measurements of discharge at the gauge station of Strinum for calibrating and validating WaSiM-ETH, as not all hydrological processes in the catchment area are represented here. By incorporating additional pedological and hydropedological data for modelling (multi-criteria calibration), a plausible spatial distribution of most components of the soil water budget was achieved. Furthermore, by increasing the number of soil moisture measurements in the study area, small-scale variations of the soil water budget in the catchment area were more appropriately addressed. Small differences between the measured and modelled values remained due to the fact that the measurements at the monitoring stations were only samples, too. However, the trends of the measured values were adequately confirmed by WaSiM-ETH. The high degree of concordance between the measured and modelled values on the micro, meso and macro scale as well as between the results of the different methods and models proves the validity of the newly developed approach. In future, the bottom-up approach will become more important for hydrological modelling, since many questions necessitate plausible spatial data. Although the bottom-up approach is more costly in terms of time than traditional modelling approaches, it considerably improves modelling results.