Development of a New Methodological Approach to Assessing the Geoecological Risk of River Water Pollution with Biogenic Substances

A methodological approach was developed for assessing the geoecological risk of river water pollution by biogenic substances due to diffuse runoff from agricultural and reclaimed lands, as well as from point sources, using the example of the left tributary of the Volga River. The results of studies on water quality assessment across river cross-sections based on monitoring data were presented, along with statistical processing of hydrochemical analysis data for analyzing the geoecological risk of river water pollution. A complex indicator was used – the specific combinatorial index of water pollution, which made it possible to assess the impact of the total presence of several pollutants. Calculations of the potential eco-economic damage were performed, and the geoecological risk of water pollution due to the influx of biogenic substances from the watershed of the studied river was assessed.