The article presents the hydrological factors of the changes of the water ecosystems condition in the Lower Volga. The general characteristic of the researching region problems are considered. The qualitative characteristics of the hydrological changes of the Lower Volga watercourses have been received with the help of the hydrometeorological monitoring data. It’s been revealed that these changes are very significant and can be considered as the main reason of the water ecosystems degradation in the researching region. To provide the improvement of the water bodies state in the Volga-Akhtuba floodplain the scheme of the additional water delivery into the River Akhtuba through the special water conduit is recommended. The effectivity of the recommended approach has been investigated by the method of the hydrodynamic modeling.
Keywords: Volga-Akhtuba floodplain, hydrological regime, river flow, nature ecosystems, nature management, water exchange, watering.