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Integrated assessment of ecological status and ecological well-being of water bodies based on monitoring presupposes attributions of the aquatic ecosystems to definite gradations of trophic state and level of pollution. In really these attributions are carried out by means of multi-criteria evaluation. The evaluation uses a number of parameters. Each of them must be indispensable, and the parameters taken together must be sufficient for the precise evaluation. Of course, each of the parameters must be suitable for...