ABSTRACTGround water is an important source of water supply in Czechoslovakia, and its use is very carefully planned because the resources are unevenly distributed. The supply is limited because Czechoslovakia is situated on the European water divide between the North, Baltic, and Black Seas, and all waters flow out of the State. The paucity of ground‐water resources, requiring assessment and classification of the utilizable ground water, has led to development of a State ground‐water resources zoning plan. Increasing demand for ground water has resulted in extensive and responsible hydrogeological research, contributing to a good knowledge of the ground‐water resources. Czechoslovak hydrogeology has been developed to a high level, even though it is a relatively young branch of science, and stands in some respects in the forefront of world hydrogeology, especially in prospecting, development and protection of mineral‐water resources, hydrogeological mapping, and ground‐wat
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