Land Use Planning on Floodplain Areas (PAP014902)

Código

PAP014902

Autores

Carla Voltarelli Franco da Silva, Mônica Ferreira do Amaral Porto, Arisvaldo Vieira Mello Júnior

Tema

Land use and Floods, landslides and erosion

Resumo

Current patterns of land use and occupancy in Brazilian cities have exacerbated the difficulties faced by the urban population and the government during extreme flood events. In this context, land use regulation combined with the identification of areas most susceptible to the impacts caused by flooding emerges as an important strategy for the development of local urban policies. This study aimed to develop a set of intervention measures for land use regulation in the urban area of the city of Atibaia, characterized by disordered occupation and developed along the Atibaia river and its tributaries. The suggestions were based on flood mapping carried through hydrologic analysis, to determine the probability of events occurrence, and hydraulics, for the delineation of flood extent based on the application of PCSWMM, which integrates SWMM model with advanced geoprocessing tools. Through an extensive analysis of applicable legal aspects, it was possible to identify challenges and prospects of land use planning as an indispensable tool for flood control and water resources management. The results address analyzes of rainfall and streamflow recorded in the region and the intersection between a 100-year flood map and relevant physical and political interfaces, such as permanent preservation areas, environmental protection areas, population density and the urban zoning currently in place. Based on this scenario, criteria of land use compatible with flooding were listed. The main guidelines consist of the removal of buildings installed in the greater risk areas and of the prevention of occupancy and inducements to adequate flood-proof constructive patterns in other areas where restrictions are required.