Climate changes are in accordance with all the factors and verifiable facts which will in the next decades of 21st century significantly affect the natural conditions of people's lives and functions of infrastructure in most current climate areas. It is not excluded that the part will be changed into the subtropical zone with all the accompanying effects both on the aquatic environment and the aquatic ecosystem. From the mentioning above follows that the surface water will be affected primarily, groundwater secondarily. Both aquatic ecosystems in the terms of European countries are largely dependent on rainwater intensity, distribution and volume. Changing these parameters will affect not only individual state water use for energy purpose, but also surface water use for abstraction for treatment as drinking water. The meteorological and subsequent hydrological drought will show the water quality used for these purposes. The lack of water will almost certainly excludes some parts of current water sources from their functions due to lack of raw water and also for significant change due to fabric load quality exceeding water limits for different types of use. This article discusses these issues in the basic range, including the definition of ways and means of their elimination.
