Gauging stations for hydrological study areas

Since 1957 the hydrology division of the FOEN has operated a network of hydrological study areas aimed at observing long-term changes in the water regime within Switzerland’s most natural catchment areas and reflecting the scope of its wide-ranging climatic regions. Therefore, it covers the natural depth of runoff for about 40 catchment areas and calculates the monthly and annual area precipitation for many of these areas as well as their annual evaporation.