Water-budget of Upper Lake Constance: An estimation of total supply based on runoff and water level variations

An inflow-outflow model of the Upper Lake Constance has been adapted to fit the discharge data from the outletSeerhein at Constance. In order to perform mass balances the supplies and runoffs of the lake were calculated from 1961 at 1991.Three decades worth of results show no trend in annual supply patterns, aside from annual and seasonal fluctuations. When compared to earlier results, one finds slightly greater annual runoffs into the Seerhein of approximately 5%.