On the Classification of Water Quality from an Ecological Point of View

In the base of our experience we are presented the most continually system of the water quality classification. The system included chemical, physical, and biological variables that ranged into five or even six Classes of water quality and nine ranks. The system covers the entire range of environmental indicators in which the existence of an aquatic ecosystem is possible. At the heart of the classification is Vladimir Sladechek’s model, which covers all possible types of water that exist in nature. In the presented classification, only one quadrant describing natural aquatic habitats with photosynthetic in the basis of the trophic pyramid is mentioned. The WESI index calculated on the basis of this classification of the index of saprobitys and the concentration of trophic elements in water is also presented. The index reflects the degree of toxic effects of the environment on the photosynthetic process in the ecosystem.