The city of Alenquer, located in the Lower Amazon region of Pará State, historically suffer
the threat of flooding. Every year in the flood season, the Surubiú stream increases your level,
flooding the lower parts of the city. This thesis analyzes the existing flood risk in the city of
Alenquer providing tools for management and improvement of the actions of government.
The threat analysis was based on a methodology that combines historical data, hydrology,
map building and participatory field work with GPS, identified three distinct areas in the city:
(i) high susceptibility area annually affected by floods, is 8,4% of the city area (ii) area of
moderate susceptibility, only achieved when the highest rates observed streamflow and (iii)
the area that even larger floods is not achieved. The calculation of vulnerability occurred from
the construction of an index that includes census data from demographic field work to identify
the essential elements and units of responses. After the application of the index found that the
17 sectors of the city, five have high vulnerability, and the other moderate vulnerability. In the
risk analysis data vulnerability and threats were integrated and again three areas in the city
were identified (i) the high risk area represents 9.45% of the city, where there is high
concentration of essential elements and several responses, leading to social and economic
damage upon the occurrence of flood (ii) area of moderate risk, 30 % of the city and (iii) low
risk zone which corresponds to 60.55% of the city. The Master Plan of the municipality was
analyzed with a few questions to verify the inclusion of the theme of threat, vulnerability and
risk in this document, after the analysis can conclude the lack of discussion of this theme in
the master plan. The results of the research are important for supporting public policies and
documents required by the Civil Defense at the time of disasters.
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