Abstract
On the basis of results from water pollution studies carried out at different monitoring stations in some British, German and Polish rivers, the authors have established relationships between concentration and flow for various water quality parameters. Three basic types of the curve representing this correlation are presented in the paper: for heavily polluted rivers, for unpolluted rivers and for rivers with intermediate pollution. Authors conclude that the conditions for the application of this interpretation are that the sampling of river water is performed simultaneously with the rate of flow measurements and that a sufficient number of observations is made preferably over the whole amplitude of flows occurring in a given research period. The highest degree of accuracy in evaluation of the state of pollution of a river, defined by means of regression equations established statistically, is obtained from the observations gathered by continuously operating automatic water quality monitoring stations.
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