White water refers to the turbulent, frothy appearance of river water as it aerates while flowing rapidly over obstacles like rocks, ledges, or drops. This natural phenomenon creates "rapids," which are categorized by the International Scale of River Difficulty to help enthusiasts find appropriate challenges. The Scale of Difficulty
Straightforward rapids with wide, clear channels and occasional maneuvering.
Intense, powerful rapids with constricted passages and turbulent water.
Moderate, irregular waves that may be difficult to avoid and require precise maneuvering.