ANALYTIC HIERARCHY PROCESS (AHP): UMA DEFINIÇÃO DO RISCO À INUNDAÇÃO PARA A AMAZÔNIA SETENTRIONAL.

Working with environmental risks is to work with different variables that can interfere in the process of genesis and / or intensification of phenomena harmful to society. The search for alternatives to probabilistic assessment of natural aggressive phenomena to society, that is, risks have been a constant. Therefore, to suggest the Analytic Hierarchy Process (AHP), free software provided by the Instituto Nacional de Pesquisas Espaciais (INPE) as a means to this end seems logical, since it allows the weighting of different elements and their subsequent hierarchization for diagnosis and decisions-making against the risks. Thus, the objective is to analyze the environmental variables that support the genesis and / or intensification of flood risk areas in the city of Boa Vista-RR and subsequently map them through the AHP. We used slope data, flood distance of main drainage, watersheds of secondary drainage, and land cover and use for hierarchy in the AHP, through the Linguagem Espacial para Geoprocessamento Algébrico (LEGAL), which allows weightings between the listed elements. AHP proved to be effective geoprocessing software in measuring flood risk areas and producing products to deal with present and future risks. [ABSTRACT FROM AUTHOR]