The World Meteorological Organization (WMO) awarded the three FOEN hydrological measuring stations Thur-Andelfingen, Birs-Münchenstein and Sitter-Appenzell as “Centennial Observing Stations” (COS) at its Congress in May 2023. The COS are unique and reliable sources of information on past atmospheric and hydrological parameters, as they provide consistent and quality-controlled data over decades. Until now, this recognition was only awarded to meteorological stations. Hydrological measuring stations are now also part of the "Centennial Observing Stations".
The data are freely available on the web portal "Hydrological data and forecasts":