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The water quality of the watersheds is formed under influence of both natural and anthropogenic factors. One of the reasons for the intensive decline of the quality of natural waters is the growth of anthropogenic impact and urbanization (Rotanova and Pupkova, 2013; Ternovaya et al., 2015). Small rivers located in industrial and densely populated areas are exposed to the most severe pollution. As a rule, they are more vulnerable to pollution and have a lower ability to natural purification. The Barnaulka River is a typical example of such water bodies. Barnaulka the left tributary of the Ob River flows through the Barnaul city. Features of the relief of the urban area are such that organized (through the storm sewer system) and diffuse surface runoff enters in the Barnaulka River, both directly and through its tributaries Vlasikha River and Brewery River (Rotanova and Pupkova, 2013). For many years the main pollutants of Barnaulka are nutrients (ammonium, nitrites, phosphates) and some organic substances (Noskova et al., 2019). The Altai Center for Hydrometeorology and Environmental Monitoring performs water quality of the Barnaulka River only at its mouth. Therefore, the purpose of this work is to assess of water pollution in the Barnaulka River, flowing through the city, using the water pollution index.

Assessment of pollution of small rivers in urban areas (the case study of Barnaul city)