Flood control channel

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Flood control channels are a series of large, concrete, and empty (except when a flood is actually present) open-air channels that extend a ways below the street levels of some larger cities, so that if and when a flood occurs, the flood will run into the channels, and proceed to be drained to the proper source of water. One city which contains many of these channels is Los Angeles, as they became mandatory with the passage of the Flood Control Act of 1941, passed in the wake of the Los Angeles Flood of 1938.