The historical Lake Lorsch in the Upper Rhine Graben (Germany) is a good example of how humans have changed the fluvial and hydrological systems in the area for at least 500 years. Interdisciplinary research from geomorphology and historical sciences have reconstructed the history based on old maps, digital elevation models and drillings. The results show a sophisticated system of artificial in- and outflows, which partly still exist today, and represent long-term changes in the Weschnitz floodplain.