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Introduction of measures for intra-day of regulating runoff incoming water flow rates from the Nizhny Novgorod HPP and their discharge through the spillway of the Nizhny Novgorod low-pressure hydroelectric complex requires a specific algorithm for dispatcher actions of the created hydraulic system. At the same time, there are serious difficulties in predicting the water regime over time. As previous studies have shown there is a large unevenness and irregularity of water discharges not only during the same day, but also in the same periods of each day, as well as weeks, months, and years. Тhis article analyzes the boundary conditions when introducing measures of regulating runoff, a mathematical model and an algorithm for solving the problem of intraday regulation are developed, describing the sequence of actions for solving the problem of "smoothing" the flow rates supplied to the lower stream of the Nizhny Novgorod low-pressure hydroelectric complex. The implementation of the proposed measures is carried out according to a three-stage (or two-stage) schedule for regulating the flow rate and water level. The proposed measures will improve the hydraulic and hydrological conditions of the downstream reach of the Nizhny Novgorod low-pressure hydroelectric complex by which the necessary depths for navigation will be reached. Conditions have also been created to mitigate erosion processes.

The article considers possible problems for shipping, which may arise after the construction and commissioning of the Nizhny Novgorod low-pressure hydroelectric complex. By analyzing the available data on the change in navigation expenses through the Nizhny Novgorod hydroelectric power station and the predicted calculation of the water regime in the alignment of the created Nizhny Novgorod low-pressure hydroelectric system, it is ascertained in the article whether the navigable dimensions in depth are ensured in the section above and below the alignment of the NNSU during the navigation period. In order to determine the possibility of regulating runoff on a spillway of the Nizhny Novgorod State University, an experiment is set up at the Volga State Unversity of Water Transport laboratory, during which the speed and time parameters of the water flow are established. The article presents the results of the work.