Hazard mapping for debris-flow events in the alluvial fans of northern Venezuela

Hazard mapping for debris-flow events in the alluvial fans of northern Venezuela Conference

Garcia, R, López, JL, Noya, M et al. (2003). Hazard mapping for debris-flow events in the alluvial fans of northern Venezuela . 1 589-599.

Garcia, R; López, JL; Noya, M; Bello, ME; Bello, MT; González, N; Paredes, G; Vivas, MI; O'Brien, JS

This article proposes a methodology to delineate hazard maps due to mud and debris flow events, based on the application of the FLO-2D model. The methodology includes criteria to define potential flood hazard depending on the event frequency and intensity. Several processor programs complement the use of the FLO-2D model and automate the process of generating the hazard maps. The methodology was tested in twenty three sites in the Caracas and Vargas State region in Venezuela. This paper describes one application to Macuto alluvial fan in the San Joséde Galipá basin. The model results compare very well to the maximum flow depths and area of inundation observed during the December 1999 Vargas mud and debris flow disaster. The hazard maps for the region are being used by planners of the Venezuelan Ministry of Environment and Natural Resources and other agencies to design emergency plans and new land use policies. The methodology is being expanded to other flood hazard regions in Venezuela. © 2003 Millpress.