Preliminary valorisaion of the Major Groudwater Basins, including the assesment of groundwater useful properties, as well as necessity and order of protective measures (Paczyński, 2003) is a research project undertaken by Polish Geological Institute at the request of the Minister of Environment. The PGI performed an assessment of the MGBs taking into account a wide range of aspects and with use of various documentations, results of studies, publications, archival and cartographic data. The two years hydrogeological research was cartographically summarized in the Map of Preliminary Valorisation of the Major Groundwater Basins in 1 : 500,000 scale, which is another step in documenting the Major Groundwater Basins. The valorisation revealed that most of the documented MGBs urgently require establishing protective zones and that there is an pressing necessity of implementing and designating “Strategic Groundwater Basins”.
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