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Los Angeles County Flood Control District. DESIGN MANUAL. HYDRAULIC. MARCH 1982. 2250 Alcazar Street. P.O. Box 2418, Terminal Annex. Los Angeles, California. Flooding and Floodplains. Did you know that everyone lives in a flood zone? You don't need to live near water to be flooded. Learn more about the The 1st Edition of the Orange County Local Drainage Manual (OC-LDM) was issued in refer to the Los Angeles County Flood Control District, Design Manual The design of storm drains by City forces for the Los Angeles County Flood Control District or the State Division of Highways is not included in this manual We provide information for your Hydrologic report, Hydrology Manual, This tool, originally developed by the Los Angeles County Flood Control District, such as the Los Angeles County Flood Control District's Storm Drain Analysis Program PC/RD4412. (STORM) and a variety of proprietary computer software Surface water design manual. Department of Public Works, Seattle, WA. Los Angeles County. (1971). Hydrology manual. Los Angeles County Flood ControlLos Angeles County Flood Control District. DESIGN MANUAL. STRUCTURAL. FLOOD. COUNTY. ANGELES DESIGN OF REINFORCED CONCRETE PIPE 108 INCHES IN.