I like the simulation video at [1] which shows how a low head dam works in various conditions and how the risk can change dramatically depending on water flow, velocity, sediment levels or obstructions changing in a river. Note the hydraulic jump at 1:05.
Quite surprisingly, the incidence of deaths from whitewater kayaking and rafting is around 6 deaths per million participant days, compared to around 150 deaths per million participant days driving in cars[2].
Quite surprisingly, the incidence of deaths from whitewater kayaking and rafting is around 6 deaths per million participant days, compared to around 150 deaths per million participant days driving in cars[2].
[1] https://serc.carleton.edu/details/files/19075.html
[2] https://w.wiki/3Sma