Assessment of Nutrient Pollution of the Pavlovsk Reservoir Water on the Ufa River

The article describes the nutrients' regime formation in the Pavlovsk Reservoir on the Ufa River. The reservoir is the main drinking water source for Ufa with more than a million population. Based on statistical data on the population, livestock, the amount of mineral fertilizers input, and the number of recreation facilities' clients in the municipalities in the reservoir basin potentially polluting the Pavlovsk reservoir, pollution volumes from municipal/domestic, and agricultural discharges, as well as recreational loads have been determined. The authors have calculated the nitrogen, phosphorus, and potassium input to the Pavlovsk Reservoir, they have determined dynamics of the reservoir pollution with nutrients. A comparative analysis of nutrient inputs for more than 30 years of observation has been made (from 1987 to 2018).