In 1938, the San Gabriel Mountains (Los Angeles, USA) experienced heavy amounts of rain. This then led to mass movement, such as mudslides, and flash flooding, which flushed through downtown LA, damaging buildings, homes and vehicles. After these events, a flood committee was formed, and networks of hard defences were set up along the long profile of the San Gabriel River. The aim: decrease the hydrograph, and reduce the risk of flooding.
In the upper course of the San Gabriel River, the San ...
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