Sectorization Result of the Flood Risk Areas in the Urban Zone of Marabá in the State of Pará (PAP015034)

Código

PAP015034

Autores

ÍRIS CELESTE NASCIMENTO BANDEIRA, ELTON RODRIGO ANDRETTA

Tema

Urban Floods

Resumo

The city of Marabá, located in the southeastern portion of the state of Pará, specifically on the banks of two major rivers, Tocantins and Itacaiúnas, presents many lowland areas, vulnerable to gradual flood, which in the period of low precipitation are occupied by people who do not know that these regions are seasonally affected by river water. Beyond ignorance, there are residents who refuse to permanently relocate to another safer place and in the period of intense rainfall (January to May) stay in shelters or with relatives. These occupations on flood plains allow the emergence of risk areas, where annually more than 4.000 families lose their possessions, are homeless and displaced. In order to reduce these losses, Marabá, as well as other cities in the country that have geological and hydrological risk, is being sectored according to the National Risk Management Plan and Disaster Responses from the Federal Government, so that this information is used by the municipal defense in preventive actions in case of storms. Were used altimetry data provided by the city, historical flooding information provided by the municipal civil defense obtained in SUDAM rainfall data, satellite imagery Geoeye 2010 and surveys in place to map risk areas of the city. Considering the history of flooding in 30 years (1982 to 2012) the highest levels were recorded in 1990 and 1997, when the river level exceeded 14m, reaching the quota 83, 41m, were used the quota of 83,5 for delimiting the sectors, since was considered the possibilility of occurrence of other events, such as 1997. Based on these data were identified eleven risk flood sectors, located in the neighborhood São Félix Pioneiro, at the right bank of the Tocantins River; neighborhoods Folha 6 and Folha 13, on the left bank of the Tocantins River, in the neighborhood Folha 14, associated with a tributary of the Tocantins river, in the neighborhoods Santa Rosa, Santa Rita, Francisco Coelho and Vila do Rato, located at the confluence of the rivers Tocantins and Itacaiúnas, and are the first to be hit by water during the period of highest rainfall, and the neighborhood Amapá, Folha 33, Belo Horizonte, Novo Planalto and Independência that are reached annually by the increase of Itacaiúnas river level