Vulnerability environmental and flood risk in rio Poti, Teresina, Brazil | Vulnerabilidade de riscos ambientais e inundações no rio Poti , Teresina , Brasil

Floods are natural events associated with urban peculiarities become sources of danger, worsening the population's living conditions in the city. In Brazil, the scenarios of environmental degradation resulting from social inequalities and poor infrastructure, coupled with the occupation of spaces problems highlight risks and vulnerabilities that often coincide with urban river environments. So the objective of this study is to analyze the flooding of the river Poti and the risks and social and environmental vulnerabilities present in Teresina, about urban stretch of the curve São Paulo to the confluence with the Parnaíba, for understanding the interfaces of vulnerabilities and exposure to environmental risk certain areas and population groups. The methodology involves statistical techniques to categorize precipitation (quantile) and analyze the changing trend (ClimDex), and multivariate analysis to classify the social vulnerability, fieldwork and newspaper survey. In the precipitation analysis it was found that the total rainfall follows trend of slight growth, with attention for the urbanization and the occurrence of flood disasters. It is concluded that there are strong similarities between the districts subject to high risk of flooding and neighborhoods with high social vulnerability