This paper describes the method of the water quality index (WQI), which is used to estimate the cleanness of water. It contains the lists of basic and additional parameters, the formula for the summarized index and the algorithm for evaluation of summarized and guarantee index. It is illustrated by practical examples of evaluation of WQI in the rivers of the Vistula basin in Poland.

Guarantee index, parameter, summarized index, unit index, water quality class, water quality index
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© IWA Publishing 1994
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