Flows are landslides that involve the movement of material down a slope in the form of a fluid.
When material on a slope becomes saturated with water, making it much heavier, it may develop into a debris flow or mud flow.
The flow of material, a slurry of rock and mud, may pick up trees, cars and even houses. The debris flow can often block streams causing flooding as their path is diverted.
Flows often leave behind a distinctive upside-down funnel-shaped deposit where the landslide material has stopped moving.
A good example of a flow landslide is at the A85 road, Glen Ogle, Stirlingshire or the Rest and Be Thankful Pass (A83), Argyll.