Índice de risco potencial de inundações como ferramenta para o planejamento de áreas urbanas em expansão

Abstract

Urban floods cause a series of damages in different sectors. This result is aggravated by inadequately planned urban development processes, associated with undisciplined occupation of the territory and traditional engineering projects, which usually aim only at the rapid drainage of rainwater. A more proactive and preventive approach to the problem of flooding, in the context of urban planning, is an urgent need, demanding tool support to guide urban development, in order to preliminarily identify the main areas susceptible to flooding events, enabling actions that recognize the natural dynamics of water and the integration of sustainable urban drainage concepts in city development. In this context, this work aims to propose a multicriteria methodology for preliminary assessment of the potential risk to which an area may be subject, to subsidize the urban planning process, in a relatively simple and fast way, without the need for detailed mathematical modeling of hydrodynamic physical phenomena. This methodology seeks to offer a quantitative assessment of the potential flood risk for a situation of occupation of the territory under analysis, composing a multicriteria index that considers the susceptibility of the physical environment to floods and the vulnerability of the urban system potentially affected by floods. The methodology will be applied to a case in the Piraquê-Cabuçu River basin, located in the municipality of Rio de Janeiro.