Page "Rafting" Paragraph 38
from
Wikipedia
Certain features on rivers are inherently unsafe and have remained consistently so despite the passage of time.
These would include " keeper hydraulics ", " strainers " ( e. g. fallen trees ), dams ( especially low-head dams, which tend to produce river-wide keeper hydraulics ), undercut rocks, and of course dangerously high waterfalls.
Even in safe areas, however, moving water can always present risks — such as when a swimmer attempts to stand up on a rocky riverbed in strong current, risking foot entrapment.
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