The quality of river water was assessed by identifying time periods for which the values of turbidity, chromaticity, oxidizability and total hardness are maximum or minimum. Periods with high values of indicators were identified for which strict quality control of water purification is required: from January to April for total hardness and from April to July for turbidity, chromaticity and oxidizability. It was revealed that the largest deviations from the standard values in terms of indicators with their total impact on water pollution fall on the period from April to July, and the most unfavorable month is May. It has been established that the priority pollutant for the studied sections is water turbidity.
Monitoring of the total water hardness in the river was carried out by means of mathematical modeling and statistical processing. The distribution laws of the total hardness are found separately for each month, which more accurately reflects the impact on the seasonality index. It is determined that the obtained empirical distribution functions of the indicator do not correspond to normal and log-normal distributions, but are quite accurately described by polynomials, which is confirmed by Kolmogorov’s goodness-of-fit criterion. The resulting distribution functions of the total hardness of water make it possible to predict the probabilities that the indicator will take certain values.
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