Why can a rapid's grade change?

It depends on water depth and speed of flow.

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  1. It changes only when the river is renamed
  2. It is fixed forever by law
  3. It depends on water depth and speed of flow ✔

Why: A rapid's grade is not fixed and can vary greatly with water depth and flow speed.

Huh, didn't know that: A rapid's grade is not fixed and can vary greatly with water depth and flow speed.

The dad joke
Same rapid, different grade: that is a class act.
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References

Answer: It depends on water depth and speed of flow. A rapid's grade is not fixed and can vary greatly with water depth and flow speed.

  1. Whitewater en.wikipedia.org/wiki/Whitewater
    A rapid's grade is not fixed, since it may vary greatly depending on the water depth and speed of flow.
    Checked 2026-11-07.

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