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Engineering Methodology for Delineating Debris Flow Hazards in Los Angeles County

by Sree Kumar, Los Angeles County Dep of Public, Works, Los Angeles, CA, USA,



Document Type: Proceeding Paper

Part of: Water Forum '86: World Water Issues in Evolution

Abstract:

Utilizing historical and field data, elementary geomorphology and simplified hydraulics of debris flows, a mapping strategy has been developed. The delineation procedure includes defining the transport and deposition zone, the flow expansion, the gradient of deposition, and quantity of debris that is delivered to the fan. The relative likelihood of hazard within the total fan is identified considering the influence of adjacent canyons and the effect of improvement such as debris retention facilities, conveyances, and streets. The delineation of the hazards below the watershed will enable development of zoning and flood-plain management regulations.

Subject Headings: Debris | Natural disasters | Mapping | Water supply systems | Solids flow | Sediment transport | Transportation management | Los Angeles | California | United States

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