Valuation of characteristics of water purity. II. The use of numerical methods for the taxonomic appreciation of selected characteristics of water purity.

Numerical methods have been employed to determine the taxonomic value of a number of microbiological, hydrobiological and chemical characteristics of water purity either in current use or proposed. Numerical methods have at the same time served to evaluate the usefulness and correlation coefficients of these characteristics in classification of the degree of pollution in different stretches (sites) of rivers.