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Purpose: to determine the impact of the conjugation construction of the apron section structure with the downstream on the water flow kinematics with the use of the performed field and laboratory studies data and their processing. The relevance of this issue lies in the fact that in case of unsatisfactory conjugation of the apron with the discharge canal slopes, negative phenomena are formed in it in the form of faulty currents, whirlpools at the canal slopes, etc., affecting the stability of the apron conjugation, creating a threat to the stability of the structure itself.  Materials and Methods: the materials were the data of field studies carried out on a number of hydraulic structures of irrigation systems in Stavropol Territory, as well as on models in laboratory conditions with the identification of the impact of conjugation structures of the apron with the discharge canal slopes on the water flow distribution in tailrace. The measurement of velocities in natural conditions was carried out by observing the integrating floats movement in the discharge canals. On the model, the velocities were measured using a miniflowmeter, and the trajectories were traced using luminous floats.  Results: graphs of the dependence of the sought factors on the known parameters were built on the basis of the information obtained, and using the methods of mathematical statistics, the coefficient of the conjugation of the apron structure with the canal slopes in tailrace was obtained. The result of the research was an empirical dependence for determining the flow velocity along its dynamic axis, which is the scientific novelty of the research performed.  Conclusions: the type of conjugation of the apron of the structure with the distribution canal slopes has a great influence on the hydraulic flow regime on the apron and in the discharge canal. Each type of conjugation creates a sudden expansion of the flow on the apron, which affects the value of the average flow velocity along the dynamic axis, on which the deformation of the discharge canal depends.

Impact of the conjugation construction of the apron section structure with the tailrace on water flow kinematics