When I was a lad, one of the first things I was taught in fluid mechanics was the hydraulic jump. Though I have not met any use for the theory in my professional life (how many offshore O&G assets have channels rather than piping), I still know theory.
Anyhow, I met a nice example of hydraulic jumps while messing about at Desa Water Park.
You can see a Photosynth of some of the park’s attractions here.
Wata - Malaysian Oil and Gas Engineer 