NADUF - National long-term surveillance of Swiss rivers (2022-1)

The “National Long-term Surveillance of Swiss Rivers” (NADUF) program was initiated in 1972 as a cooperative project between three institutes: + [Federal Office for the Environment (FOEN)](https://www.bafu.admin.ch/bafu/en/home.html) + [Swiss Federal Institute of Aquatic Science and Technology (EAWAG)](https://www.eawag.ch) + [Swiss Federal Institute for Forest, Snow and Landscape Research (WSL)](https://www.wsl.ch/en.html) (since 2003) The following institutes participated later: + [Amt für Umwelt und Energie des Kantons Basel-Stadt (AUE)](https://www.aue.bs.ch) + [Federal Institute of Metrology (METAS)](https://www.metas.ch/metas/en/home.html) With the NADUF program, the chemical-physical state of Swiss rivers as well as intermediate-term and long-term changes in concentration are observed. Furthermore, it provides data for scientific studies on biological, chemical and physical processes in river water. The NADUF network serves as a basic data and sampling facility to evaluate the effectiveness of water protection measures and for various scientific projects. ### Data 2019 and 2020 Over the period from December 30, 2014 to December 10, 2019, the water samples for the chemical parameters were changed 24 hours earlier than officially declared. Therefore, the aggregated online data (discharge, water temperature, pH, conductivity and oxygen) for these periods may vary slightly. You find the adapted date and online data in the excel file “WJ-xx.xlsx" as on a separat sheet.