HYDROGEOLOGICAL CHARACTERISTICS THE TERRITORY OF THE RUSSIAN-POLYANSKY DISTRICT IN OMSK REGION AND THE POSSIBILITY OF USING GROUNDWATER FOR WATER SUPPLY PURPOSES
The relevance of the work is related to the fact that the Omsk region is experiencing a shortage of water not only of drinking quality, but for household needs, in connection with which, an emergency mode is periodically introduced in certain areas of the region. The authors attempted for the first time to generalize the materials of hydrogeological surveys for the territory of the Russian-Polyansky District of the Omsk Region. The article presents the characteristics of geomorphological, geological, hydrogeological structure of the territory of the Russian-Polyansky district of the Omsk region, as well as the state of water supply. The territory of the Russian-Polyansky district is geomorphologically confined to the North-Kazakhstan early-mid-Quaternary erosion-accumulative plain in the North of the district with the morphological structure of ancient hollows of runoff, in the middle and southern part of the district - high lake plains. In this territory the common modern lacustrine-marsh, upper Quaternary alluvial deposits, Neogene deposits of the Pavlodar and tavolzhanskiy suites. Deposits of Nekrasovskaya series are ubiquitous, they include deposits evrosimovska, Zhuravskaya and chertalinskoye suites. Groundwater aquifers of the Neogene-Quaternary complex distributed within the watershed plain of the Russo-Polyansky district are characterized by excess of the established SanPiN 2.1.4.1074-01 MPC of iron, manganese and nitrates. In General, groundwater of the Neogene-Quaternary aquifer complex in the Russian-Polyansky district of Omsk region is not protected from surface sources of pollution due to shallow occurrence. In hydrogeological terms, the territory of the district has a two-tier structure. According to the conditions of formation there are two hydrogeological floors - upper and lower, separated by a powerful regional aquiclude. Conclusion: the greatest interest for drinking water supply in the area is the lower-upper Cretaceous aquifer in the deposits of the Pokur Formation (lower hydrogeological floor).