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Collection by charging drainage rates can result in dividends which can meet the costs for the implementation of an urban drainage plan. However, there is no consolidated methodological basis to measure the collection potential of a watershed for purposes of financial planning. Therefore, the aim of this article is to quantify this potential by classifying the financial autonomy of each watershed to implement a drainage plan. Thus, the multivariate statistical inference is applied independent variables: average per capita income, the property facade and waterproofed area; and dependent variable: drainage rates obtained by the Tucci method. Thereby, the adequacy of a model, the generalization of this model to the sub-basins in the short and medium term, and the classification of financial autonomy were permitted for the purpose of planning. The proposal applied in the watershed of the urban area of Belem/PA, Brazil, revealed that the collection potential of a sub-basin is independent of income and facade as well, but it is directly proportional to the waterproofed area to achieve its financial autonomy. Key-words: Multivariate statistical inference; drainage rate; urban drainage plan.

Aplicação de Inferência Estatística como Suporte ao Planejamento Financeiro de Bacias a Partir da Cobrança de uma Taxa de Drenagem