Assessment of Water Quality in the Systemof Reservoirs–Sources of Water Supplyin Moscow Based on Long-term Dynamicsof Hydrochemical Parameters

The patterns of dynamics are revealed for some hydrochemical parameters of water quality (the concentration of mineral nitrogen, phosphorus, natural organic matter, manganese) based on the Mosvodokanal monitoring for the period of 1988–2011 for of two reservoirs–sources of water supply in Moscow (Ucha and Klyaz’ma reservoirs). Based on the values of average monthly and average annual concentrations of pollutants, the statistical analysis is performed, time trends and characteristics of fluctuations in their concentrations in connection with natural and anthropogenic factors are identified.