Steel Rebar. Reinforcing bar, or rebar, is a common steel bar that is hot rolled and is used widely in the construction industry, especially for concrete reinforcement.
These flows generally occur during periods of intense rainfall or rapid snow melt. They usually start on steep hillsides as shallow landslides that liquefy and accelerate to speeds that are typically about 10 miles per hour, but can exceed 35 miles per hour. The consistency of debris flows ranges from watery mud to thick, rocky mud that can carry large items such as boulders, trees, and cars.
When soil, rock, and other earth debris can no longer hold it together and gives way to gravity, landslides happen. The downward force of a landslide can move slowly, (a mere millimeters per year) or quickly with disasterous effects. Landslides can even occur underwater, causing tidal waves and damage to coastal areas.