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The International Whitewater Rating System

Flokkur I
Easy moving water with a few riffles and small waves.
Flokkur II
Easy to Medium rapids with moderate waves, some obvious obstacles to maneuver around, some large rocks, wide channels.
Flokkur III
Medium to Moderately Difficult rapids with high irregular waves, narrow channels, rocks and holes, some maneuvering required. 1 meter high waves, some small hydraulics, some rocks and eddies.
Flokkur IV
Difficult to very Difficult; long turbulent rapids with powerful waves and holes, many obstacles requiring precise maneuvering in turbulent water. Strong waves, up to 1,8 meters high, boiling eddies, dangerous rocks and hydraulics.
Flokkur V
Extremely Difficult; long violent rapids that must be scouted from shore, dangerous drops, unstable eddys, strong, irregular currents and hydraulics.
Flokkur VI
Unrunnable - unless conditions are perfect, and then only by experts.
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