The report, written by J. W. Reagan, Chief Engineer of the Los Angeles County Flood Control District, was presented to the Board of Supervisors of the Los Angeles County Flood Control District, February 7, 1924. The report covers the work previously done to prevent flooding in southern California; precipitation data; past floods in southern California; plans for conservation of water; the Los Angeles water supply; and future plans for flood control. The report chiefly deals with floods caused by the Los Angeles River and the San Gabriel River. Also included with the report is a list of cost estimates for the proposed flood control work and twenty pullout maps.
