Energy Dissipators for Spillways and Outlet Works

The history and development of hydraulic jump and roller bucket stilling basins are given, as well as the present (1963) state of knowledge for design of these basin types. Criteria for the selection of basin type and the need for basin appurtenance are given in the light of some often overlooked considerations. The primary conclusions of the report are summarized as follows: Many factors other than established empirical or model relationships must be considered in the design of such basins, such as the absolute size of the structure, frequency of operation, and durability of river bed downstream. However, extensive use of hydraulic models over the past 25 years has done more to establish correct design criteria for such basins than any other single procedure. Future progress in improving the performance of such stilling basins will be assured with further laboratory tests and testing and reporting the findings of tests made on the resulting full size structures. An extensive bibliography on all types of energy dissipators for spillways and outlet works, believed to be essentially complete through 1962, is included.