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Water management continually requires new tools to promote the adequate allocation of investments. However, the main strategies are based on complex and expensive case studies that cannot be replicated elsewhere. This kind of effort requires time and money. Nevertheless, in many of these areas secondary data that could be used for desk research have already been available This work shares this perspective by introducing into water sciences a statistical method developed in medicine to group patients according to their susceptibility to some illness. The statistical model of maximum likelihood named Grade of Membership (GoM), based on the fuzzy sets theory, is applied by remote sensing based on secondary data. From a matrix of characteristics, an algorithm of maximum likelihood can create profiles (types) and allocate the studied elements into these groups, given the grade of membership of each element in each group. This work uses an experimental application of the GoM model to evaluate the efficiency of hilltops in the aquifer recharge in the municipality of Belo Horizonte, Brazil. The hilltops are considered preferential aquifer recharge zones in Belo Horizonte-MG. Despite the relative hydrogeological homogeneity, the environmental characteristics of the surface have great variability, changing the possibilities of water recharge. The maximum likelihood algorithm of GoM has created ideal types of hilltops based on the limiting and/or facilitating factors of the underground recharge. The results show that aquifer recharge in Belo Horizonte is compromised by human occupation and by the natural limitation of the environment. GoM is considered a very useful method for water sciences and it can answer some questions that cannot be clarified by traditional mathematics procedures. Key-words: Aquifer recharge zones, Grade of Membership, Hilltops.

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Proposta de Utilização do Método Grade of Membership (GoM) para o Desenvolvimento de Classificações Multivariadas Qualitativas em Recursos Hídricos: Aplicação para Zonas de Recarga de Aquíferos de Belo Horizonte-MG