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The present article performs an application and validation of the methodological strategy adapted to the Santa Maria River Basin presented in the previous article, entitled “Modeling of Raw Water Use Charges in the Santa Maria River Basin, RS, Brazil: I — Methodological Strategy and Adaptation to the Basin”. Furthermore, the suggested model was compared to the models of the CEIVAP and PCJ, which are federally managed Brazilian river basins for which water charging has been implemented. Model applicability was assessed through fee simulations in which the following aspects were defined: (i) investments to be simulated; (ii) characteristics of the simulations; and (iii) economic impact of fees. The simulations resulted in average fees ranging from R$ 0.007757/m3 to R$ 0.012088/m3. In the basin studied, an investment scenario of R$ 10 million per year be feasibly financed by the charges. The economic impact analysis indicated that the sectors most sensitive to charges are agriculture and rural water supply. Differently from the CEIVAP and PCJ models, the proposed model determines charging by dilution according to the volume used to dilute the BOD. This assures the sustainability of the body of water, the fulfillment of the environmental measures defined in the guidelines for basin water resources and establishes higher fees for the use of dilution, thereby inducing the reuse of water and treatment of effluents. The experience of the present study highlighted the certainty that in the early implantation process RBRH — Revista Brasileira de Recursos Hídricos Volume 13 n.1 Jan/Mar 2008, 79-89 89 of water use charges in Brazil, the main objective will be to collect financial resources to help solve the main problems regarding basin water resources. However, we must not lose sight of the fact that the induction of rational use and the manner in which the fee collection is carried out must be based on variables or criteria of justice, efficiency and environmental sustainability and not be governed merely by political decisions or social criteria.

Modelagem da Cobrança pelo uso da Água Bruta na Bacia do Rio Santa Maria/RS: - II - Aplicação em Escala Real e Validação