About the longitudinal slopes of flat rivers

Abstract The article discusses the methods of determining the longitudinal slopes of rivers, their advantages and disadvantages are noted. Various methods of determining the longitudinal slopes of rivers are analyzed. It is revealed that the weighted average slope adopted by the hydrometeorological service, determined by the graphoanalytic method, does not fully reflect the essence of the influence of slopes on the speed of water movement. It is noted that it is expedient to use the differential equation of uneven motion to determine the slopes of the water surface in the lower reaches of lowland rivers. The criterion ratio of slopes characterizing the stability of the riverbed in the longitudinal direction is revealed. The hydraulics-morphological method of determining the level and longitudinal slope of the free flow surface, as well as quantitative criteria for the movement of river flows, has been continued.

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