Abstract At coming up with of civil engineering constructions within the watercourse hydraulic calculation of the riverbeds is made. Hydraulic calculation establishes bottom main parameters: width, depth of a stream and radius of curvature of the river beds, and so on. In article results of studying of changes of morphological parameters of the riverbed are yielded: width of a bed, average depths of a stream and radius of a dynamic axis of a stream on river beds in conditions of regulated a water flow on water basins. On the footing of the statement of results from examination of hydraulic parameters of a stream with use of a method of dimension connections of width, average depths of a stream and radius of a dynamic axis of a stream from the factor forming a river bed are received.