An indicator system for surface water quality in river basins (Portugal)

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This paper presents a methodology used for the development and application of an indicator system in the Portuguese river Ave basin, based on the conceptual model Pressure-State-Response, and on chemical and hydro-morphological water quality parameters. It is shown that the most relevant questions for the implementation of an indicator system for the surface waters of this river basin are: eutrophication, bacterial contamination, presence of organic mater, oxidation state and organic metals coming from industrial wastewater discharges.