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.
So landslides happen when soil, debris and rock move down a slope, which can be either fast or very slow. The morphology, or structure of the land itself, along with erosion, can cause the land to slip. This is especially likely when vegetation is not there to stabilize the slope.