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Abstract:
The EPIK method is a general multiattribute method used for the karst aquifer vulnerability mapping and to provide a base to assesss the groundwater protection zones in the karst environment. The goal of this method developed with the support of the Federal Officle for Environment, Forest and Landscape is to produce some vulnerability maps for karst spring watercatchments. According to the selected attributes, the obtained vulnerability zones can be a base to outline the groundwater protection zones. After having determined the spring watercatchment borderlines, we proceed in four steps: 1) mapping of the epikarst (geomorphological approach), 2) protective cover mapping, 3) infiltration conditions mapping and 4) characterization of the karst network development. Each of this attribute is subdivided in classes that are weightd by a theoretical coefficient. The four attributes maps are overlayed using a GIS and for each zone vulnerability degree is calculated; the resulting map is the vulnerability map. This method was tested in Switzerland on several sites .whose some results are here introduced.