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Studies concerning flood risk assessment are extremely important for planning the occupation of urban spaces. However, this evaluation is not always feasible due to complex analyses involved, which are substantiated by physically based models that should reflect the hydrological specificities and consider the spatial heterogeneity of the basins. However, the absence of primary data and the time available for model implementation often compromise such an analysis. Thus, the use of geotechnology and of database mapping to relate the topographic features and drainage system of an area can assist in identifying areas in which the concentration of runoff could potentially lead to flooding. In this sense, the present study aimed to evaluate the accumulated flows using the Digital Elevation Models DEM and geoprocessing tools in order to identify susceptible flooding areas and to propose management planning. Beginning with the DEM of different spatial resolutions methodologies were employed for the evaluation of algorithms related to the direction and accumulation of flow. The spatial analysis of the surface flow accumulation showed consistent results when compared to hydrogeomorphogical aspects and to those obtained using hydraulic and hydrologic models of the Servidão creek watershed (SP-Brazil), thus constituting a simple and feasible planning tool. Key-words: DEM; urban flooding; planning instruments;

rbrh

Comparação de Metodologias na Definição de Fluxos Acumulados a Partir de Modelos Digitais de Elevação do Terreno Aplicado a Suscetibilidade de Inundações