RISK HAZARD MAPPING OF GROUNDWATER CONTAMINATION USING LONG-TERM MONITORING DATA OF SHALLOW DRINKING-WATER WELLS

Long-term monitoring data from over 10000 shallow drinking water wells in the county of Osnabriick (2121 km(2)) were used for generating reg ionalized time-averaged maps of top aquifer contamination. Using these approach local impacts can be distinguished from wide spread contamin ation with agrochemicals (nitrate, pesticides). Spatial databases of l and-use patterns, livestock figures, soil and meteorological data are stored in a Geographical Information System (ARC/INFO). They were over layed with regionalized aquifer contamination to facilitate the hazard mapping of top aquifer contamination. (C) 1998 Elsevier Science B.V. All rights reserved.