The classification of water bodies is a legal instrument present in Brazilian environmental legislation, as the National Water Resources Policy, Law 9.433/97. This dissertation presents a model of participatory classification applied to urban basins, and used in the basin of the Tucunduba stream, in Belém / PA. The methodology was based on five steps, as follows: a literature review on several sources; a research on other studies which took place in the basin and have employed decision support informational methodologies; the diagnosis of land and water resources use and occupation in the basin; classification workshops with local stakeholders; the use of Decision Explore software as a Decision Support System (DSS), to organize the data produced in the workshops; a research on studies related to water quality in the Tucunduba basin; and, finally, the definition of the participatory classification proposition, based on the current water bodies classification and the future uses for the Tucunduba basin. Relying on field recognition, discussions concerning current uses and local stakeholders expectations regarding the future environmental quality in the basin and the assessment of the basin water quality, a proposition for the water body classification was defined, in accordance with the current and future main uses identified, establishing that this basin should be classified as Class 2, which prioritizes the supply for human consumption after conventional treatment, the protection of aquatic communities, the primary contact recreation, irrigation and fishing.
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