This international classification system provides river enthusiasts with an overview of each class of water.
Wide, flat, and slow-moving water. Ideal for float trips in rafts. Hazards that can potentially be present are overhanging trees and log jams. These hazards are easily avoidable.
Faster moving water with increased current and small waves. This type of water is typical for canoeing.
Larger rapids are present due to an increased gradient drop and/or the narrowing of the river resulting in a stronger current. Some obstructions are present, but navigating is possible to the trained individual. This type of water is typical for family rafting.
Increased gradient and obstructions are present making these sections more challenging to navigate. This is an appropriate legal limit to commercial rafting in Canada.
This is the upper end of professional rafting and kayaking. This environment requires a tremendous amount of training and experience.
This is typically unnavigable water.