ABSTRACT
Besides the stilling basin, the ski jump and plunge pools are among the important terminal structures of a dam spillway. This chapter highlights the main features encountered with ski jumps or similar flip buckets as the origins of high-speed jets up to jet impact at the plunge pool sufficiently far away from any dam structures or embankments which may be endangered by the enormous energy release due to air-water mixture jet impact. As to plunge pools, both the granular and the rock scour types are considered based mainly on recent hydraulic laboratory techniques, by which the complexities of jet impact can be understood from the engineering perspective. The chapter presents the underlying flow features and the main hydraulic relations by which the main questions can be solved, and provides a keen outlook to a fascinating field in hydraulics that has to be considered in the future, given the many still unsolved problems.
