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Injuries while swimming are rare; self-rescue is usually easy but group assistance may be required to avoid long swims. Rapids that are at the lower or upper end of this difficulty range are designated Class III- or Class III+ respectively. Class IV: Advanced Intense, powerful but predictable rapids requiring precise boat handling in turbulent ...
Rapids are sections of a river where the river bed has a relatively steep gradient, causing an increase in water velocity and turbulence. Flow, gradient, constriction, and obstacles are four factors that are needed for a rapid to be created.
Whitewater, large waves, continuous rapids, large rocks and hazards, maybe a large drop, precise maneuvering, often characterized by "must make" moves, i.e. failure to execute a specific maneuver at a specific point may result in serious injury or death, Class 5 sometimes expanded to Class 5+ that describes the most extreme, runnable rapids ...
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[1] [2] Large sections with rapids are home to specialized, rheophilic fish, [1] [17] as well as aquatic plants such as Podostemaceae. [8] [22] There are major differences in the amount of macrophytes and this is mainly related to light: heavily shaded clearwater rivers have few, while those flowing through more open regions often contain many. [8]
They spend little time actively swimming against the rapids, living instead amongst and beneath loose gravels and cobbles. [5] They emerge from the rapids at night to feed. [ 6 ] Torrentfish are solitary and benthic , but may be found in high densities where there is a large population. [ 5 ]