Mapeamento e avaliação do risco a inundação do Rio Cachoeira em trecho da área urbana do município de Itabuna/BA / Mapping and risk evaluation of Cachoeira River flodding in some urban areas of Itabuna City, Brazil

• Main Authors: Silmara Borges da Hora, Ronaldo Lima Gomes
• Format: Article
• Language: English
• Published: Editora da Universidade Federal de Uberlândia 2009-08-01
• Series: Revista Sociedade & Natureza
• Subjects: Inundation risk; Risk map; Risk areas; Flooding
• Online Access: http://www.sociedadenatureza.ig.ufu.br/include/getdoc.php?id=1584&article=527&mode=pdf

The flodding maps are a very important instrument to prevent, control and manage the inundations,because of them, it is possible to determine the risk areas. Itabuna is located on the south of Bahiaand has about 97.20% (IBGE, 2000) of its population living in urban areas. The city has beensuffering with the constant Cachoeira River flood. In general, the time of high water causesinundation, mainly in the area of irregular occupation along the river. Thus, the purpose of thisresearch was recognizing and mapping the physical and environmental aspects of a specific areaalong the Cachoeira River, which includes the subnormal agglomerates Bananeira, Rua Beira Rioand Jaçana, considering their evaluations in face of inundation phenomenum and emphasizingthe definition of potential risk areas. Therefore, It was possible to elaborate, with the support of the ArcView software, a risk map with inundation stains for many cycle periods. The risk areas withmajor problems are in those subnormal areas, mainly because of the vulnerability of the habitationsand the irregular occupation where most of the dwelling are shanties.