Vulnerable communities are subject to impacts caused by climatic events and the harmful effects they cause to disturb the functioning of society and the possible occurrence of material losses, economic and social. The greater the ability to adapt, lower vulnerabilities. In Belém, the presence of water resources within the urban area and irregular occupation along the marginal bands highlights the factors that lead to frequent flooding in the region. Probably, the floods have risen from the position of public institutions, which encouraged the settlement of floodplains city through the grounds and channeling of streams. Thus, the process was intensified in the periphery areas of floodplain and space, profoundly changed by the occupation of non- buildable areas, such as the borders of urban waterways. As a result, the research aimed to define the vulnerability and autonomous adaptation to the impacts of flooding considering social indicators, housing and sanitation. We analyzed the structural forms of adaptation, from the observation of the buildings, their types and construction techniques. For this purpose, the methodology for carrying out the work was divided into three stages, which include the delimitation of the study area, the description of autonomous measures against floods and population analysis as a producer of these measures. The results depict the community's attempt to reduce losses on something that represents value, ie, the adaptation decision taken regarding the capacity and the type of action of the population, where adaptive measures reflect not only the skills of the community, but a number of other social indicators, economic and cognitive.
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