Extent of groundwater resources in karst regions

The Karst water resources layer shows the extent of the water-saturated zone of a karstified aquifer projected to the surface. It is determined by the karst water level and therefore the elevation of the main point of emergence (spring) of that karst system. The information in the categories Karst regions and Karst groundwater, respectively, is based on hydrogeological 3D models (KARSYS approach). It was developed, with the support of the cantons, by the Swiss Institute for Speleology and Karst Studies SISKA and is published by the Federal Office for the Environment FOEN.