To assess changes in the volume of water in reservoirs, it is necessary to determine the dependence of the values of the volume of water discharged from the reservoir on changes in the water level. The study is devoted to the development of a method for calculating the discharge capacity of the water outlet in the example of the Talimardjan reservoir. When determining the flow discharge of water from reservoirs, the magnitude of the opening and closing of the outlet gates is of great practical importance. The article analyzes the relationship between the opening height of the gate and the water discharge. To determine the coefficient of water discharge at the outlet, the ratio of different water levels and the opening height of the gate were analyzed. The results obtained were processed using mathematical statistics methods. As a result of these studies, a new dependence for the flow coefficient is obtained. The proposed calculation method makes it possible to quickly determine the amount of water discharged from the reservoir.

Irrigation canals are of particular importance to provide water for irrigated areas. In recent years, the irrigation canals of Central Asia have been negatively affected by deformation phenomena. As a result, their hydraulic parameters changed and their throughput decreased. The results of the studies in the field of the deformations and designing open irrigation canals show that a lot of work has been completed. Ensuring the static and dynamic stability and increasing the efficiency of the canals require to cover the channels with concrete cladding. The need to cover the canals with concrete cladding raises the problem of the high cost of these works. The optimal solution to the problem is to reduce concrete consumption. The article proposes a method for designing a canal from the condition of the hydraulically most advantageous section. According to the proposed method, the consumption of concrete mixture is reduced by 36% and the increase in the dynamic stability of the canal (when assessing the nanotransport ability of the canal) is increased by 26%. The research results are confirmed by the formulas used in practice.

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