Space and Time Variations of Ural River Water Quality by Long-Term Data of State Monitoring Network

The data of long-term Roshydromet hydrochemical monitoring were used to establish space and time regularities in water quality variations in the Ural River. Trends in variations in the concentrations of various pollutants in river water over the period 1986–2021 were identified. The effect of the interannual and intra-annual dynamics of water flow on water quality was evaluated. It has been shown that there is no strict dependence of river water pollution on water abundance or the season of the year in the Ural River basin. It has been found that the level of river water pollution in both high-water and low-water periods shows a significant influence of point and diffuse pollution sources in different parts of the river network.