Efforts have recently been made to renaturalize the WeiBach River which had previously been regulated in a schematic, monotonous manner. During the last flood period an agglomeration of sediment occurred, which may provoke an overtopping of the dams. In a hydraulic model with movable bed (scale 1:20) the existing conditions and possible improvements were studied in order to prevent agglomerations. Furthermore, fundamental investigations were made with regard to the influence of constructional steps on sediment transport and water levels.