San Gabriel River and its drainage problems

In 1938, San Gabriel Mountains (Los Angeles, USA) experienced a lot of rainfall. As a result, large-scale movements such as landslides and lightning occurred, downtown Los Angeles was stopped, buildings, houses and cars were destroyed. Following these incidents, the flood committee was established to build a tough defense network along the long contours of the San Gabriel River. Objective: To lower the water level and reduce the risk of flooding. San Gabriel Dam was built upstream of the San Gabriel River.

Three waterways pass through the county: the Santa Clara River, to the west of the north, the Los Angeles River south, the east and south of the San Fernando Valley to the Pacific Ocean, and the San Gabriel River rising from the San Gabriel Mountains in the north. It flows to the sea to the south. In the majority of Los Angeles, floods are flooding regularly, human efforts have severely restricted waterway restrictions in specific waterways. During the historical era (1825), the flood permanently transferred the direction of the Los Angeles River from its west exit, to the Santa Monica Bay, to the South Stream exit, and to the San Pedro Bay. In the winter from 1861 to 1862, the flood left the western part of the Los Angeles basin, and looked like a lake dotted with islands. The San Gabriel river also spills the shore, joins the Los Angeles river through a new waterway called Rio Hondo.

The Los Angeles River is formed by a large watershed flowing into the Santa Susanna Mountains, San Fernando Valley, San Gabriel Mountains, and plays an important role in the strata of the Los Angeles basin. The area near the river contains riverbank ecosystems containing countless native flora and fauna. Regular floods in the river provide rich sedimentary deposits for floodplains. Today, none of the Los Angeles River remains in the country; all sorts of rivers have been remodeled and designed. The Los Angeles River can no longer charge the passing Earth, but it can be released into the Pacific Ocean unimpeded.