The fishway of the Nikolaev waterworks on the Don river

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The relevance of the study is determined by the reduction in stocks of populations of passable, semi-passable and aquatic fish species in the Azov-Don fishery basin. One of the reasons for this is a decrease (for various reasons and circumstances) in the efficiency of the functioning of fish-passing facilities located at the Don river waterworks, providing passage of fish to their spawning sites and, in particular, the Nikolaev fishway. The purpose of this study is to assess the current state and form proposals for the reconstruction of the canal. The methodology of the work provided for the analysis of the design solution, conducting a survey of the condition of the fishway of the Nikolaev waterwork and hydrometric changes in its flow-rate parameters. The empirical basis for the analysis and subsequent development of recommendations was made up of design materials and author’s data on fixing the hydrometric parameters of the channel. According to the results of the research, the main characteristics of the fishway, information on its layout and design solution are established, data on the flow-rate and geometric dimensions of the channel tract and the flow-regulating equipment are given, information on the established deformations of the channel bed in its various sections. The disadvantages of the layout and design solution of the device and the state of the channel have been established in terms of the lack of an engineering-equipped inlet (for fish) head, the adopted design of the head controller and the output section, as well as the selected hydrometric parameters of its tract. In order to eliminate a number of identified shortcomings that reduce the quality of hydrometric conditions for the passage and spawning of fish, it is proposed to reconstruct the structure. As a result of the formation of appropriate proposals (taking into account modern requirements and accumulated experience of their creation), recommended design solutions of the main elements of the channel have been developed, allowing to significantly increase the efficiency of its functioning in terms of attracting fish to its entrance, entry, spawning in its waters and passage through the fish channel to the abovelocated spawning grounds.