Abstract

SANCHEZ, Luis Alejandro  and  MARTINEZ-GONZALEZ, Yoel. Proposal for a New Approach to Assessing Urban Flood Hazard. Tecnol. cienc. agua [online]. 2014, vol.5, n.6, pp.53-67. ISSN 2007-2422.

Flood hazard criteria in urban areas that consider combined action depht and velocity, have been developed for rural basins and are applied in Fluvial Flooding. However, with the advent of GIS tools and the modules for spatial analysis, various techniques have been developed for micro-analysis of Flood risk in watershed based on multi-criteria decision analysis and combinatorial weighting factors. The aim of this paper is make contributions to the method of (Zonensein, Miguez, De Magalhães, & Valentin, 2008) to estimate multi-criteria index, named Flood Hazard Index representative of the flood properties, for a rainfall with a certain return period and critical duration, specifically in normalized scale of (I_cot) sub-index, which still remain viable in urban areas, but does not consider the negative effects that generate depths below of curb on pedestrians and vehicles. Hazard maps were developed in a case study, then EPA_SWMM Model was applied to simulate a 1 hour and 28.8 mm depth rainfall event. Finally, new criterion was proposed for standardization of this indicator by changing the normalized scale, from a qualitative sensitivity analysis and comparing hazard maps and based both criteria.

Keywords : GIS; urban floods.

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