The hydrodynamic connection and vertical movement of water between aquifers in the south-east of the East European Platform to a depth of up to six kilometers through halogen deposits with a capacity of up to a kilometer have been investigated. Pressure points in aquifers in depth in an undisturbed state are located on the line of normal hydrostatic pressure. Deviations from it indicate a man-made impact on groundwater. The actual pressure in aquifers is determined by the height of the water column above the measuring point and its weighted average volumetric weight. The static levels of groundwater in its natural state are determined by the level of the river draining them, exceeding it by several meters, and have close reduced static levels. A method has been developed for determining the filtration coefficient of rocks on cores without preliminary mechanical processing. A method for determining the direction and value of water flows through poorly permeable cover rocks in gas and oil fields is proposed. The directions and values of groundwater flows through the cover rocks of deep-lying horizons at oil and gas fields in the Buzuluk depression of the platform are established. In natural conditions,