| Summary: | The relevance of the research. Knowledge of paleohydrogeological conditions is the important factor in solving the problems of groundwater resources assessment, mineral exploration, engineering domestic and industrial wastes landfill and prerequisite for development of longterm predicting methods of environmental changes. The aim of research is to develop and substantiate the methods of paleohydrogeological reconstructions of underground water flow and to identify longterm changes of groundwater flow in Western Siberia and the factors that determine them. Methods: geographical and hydrological and statistical methods, mathematical modeling of hydrological and hydrogeological processes. Results and conclusions. The authors have proposed the technique of groundwater runoff paleohydrogeological reconstructions and determined the relationship between the annual underground runoff from amount of precipitation for the warm period and the coefficient of the total flow. Based on this relationship they developed the method of the underground runoff reconstruction and tested it by the example of watersheds of the rivers Chuzik (South taiga subzone, the element of the Ob river synodic) and Turukhan (border of northern taiga and forest tundra, tributary of the Yenisei). It was shown that the increase in groundwater runoff is possible at growth of atmospheric precipitation and climatic cooling. Decrease groundwater runoff is determined by the reduction in atmospheric moistening and growth of waterlogging.
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