Forecasting and Regulating of the Natural Organic Matter in the Volga Water Supply Source of Moscow

The main regularities of water color and permanganate oxidizability transformation in the Volga water supply source of Moscow reservoir system have been found. Regularities of the natural organic matter content decrease in terms of water color and permanganate oxidizability within individual segments of the water supply system. The most intensive organic matter transformation within the system reservoirs occurs in the slow-flow Uchinsk reservoir where the color and permanganate oxidizability values maximum is observed during spring period. On the basis of the many-year observations results obtained in the water supply system water bodies a scheme of statistic forecasting of water color and oxidizability at water treatment facilities intake points with tree months lead time has been developed. The forecast is based on multiple linear regression equation linking the organic matter values in the Ivankovo reservoir tributaries and the same at the water treatment facilities at the closure link of the system (Uchinsk reservoir). The carried out comparison of the forecast results with the independent observation data shown a quite satisfactory agreement between the forecasted and observed organic matter values. A possibility to control the Volga River water color with low-color waters discharges from Vazuza reservoir was demonstrated with a simple balance model. As a result of the model calculations we obtained a nomogram enabling to compute the color decrease in a tribute to Ivankovo reservoir in dependence on the color difference between the Volga water and waters discharged from Vazuza reservoir provided we have pre-set proportion of water flow from these sources.