Heavy rains over large upper basins turn into floods in gulleys downwards in a short period of time. These floods become very strong and heavy enough to carry high amounts of debris.
Slope and riverbank failures in the upper basins, plus shallow slope landslides, and the resulting transportation of debris will block the culverts and bridges with carried material which lead to dangerous hazard afterwards. In order to prevent that, steel debris flow barriers are needed to regulate the river flow regime.
These systems can also be called rock barriers with some modifications to control mud and debris flows. Field tests have confirmed that these barriers can easily control debris flows that do not have the initial effect of a rolling rock but continue to add loads and forces to the system.