RADIUS OF THE JUNCTION OF THE SPILLWAY SURFACE OF PRACTICAL PROFILE WITH THE WATER APRON

One of the main task for engineer during design of hydraulic engineering structures is an accurate calculation of weir profiles in open streams. Modern technologies make it possible to obtain building materials that allow realization of the given shapes of the surface of dam structures. To increase the reliability of building structures elements of spillway vacuum-free dams, there is a need to improve methods of calculating configuration of the drainage surface in the area where it meets the apron. Subject: methods for calculating configuration of the drainage surface in the area where it connects with the apron. Research objectives: improvement of methods for calculating configuration of the drainage surface in the area where it meets the apron. Materials and methods: the method proposed in this article is based on the possibility of refinement of analytical definitions of the conjugation radius with allowance for the influence of the losses of the total mechanical energy of the falling streams due to the created turbulent stresses with the critical depths corresponding to the minimum energy on the intensity of dynamic effects of the flows onto the structures of spillway’s coupling elements. Results: the method of refined calculation of the circumference radius of the contour end section of vacuum-free weir of practical profile is proposed. Conclusion: the approach proposed in this research work can be used in hydrotechnical construction.