The Milibach River between Hasliberg-Reuti and Meiringen agglomerations in Switzerland has a limited hydraulic capacity leading to frequent flooding. During the 2005 flood event, large populated areas were inundated and damages exceeding many millions of Swiss francs occurred (Fig. 1). The deficit of the river flow capacity is essentially caused by a reduction of river cross sections due to local sediment deposits which lead to the overtopping of the lateral embankments