The great flood of 1938 destroyed 6,000 buildings and set the concreting project in motion: the 82 kilometer long river, from its origins in the coastal mountains via the San Fernando Valley and the center of LA to the confluence in Long Beach, was almost completely drained Concrete corset laid.
In some places the tub is only 20 meters wide, in others up to 200 meters, but the slit in the middle, where the water comes out, is rarely more than five meters.