Abstract
River fragmentation is one of the greatest challenges on environmental planning at the light of water resources management. The need for dams for hydropower generation, irrigation and public water supply, results in increasing pressure on the ecological integrity of water bodies. This paper proposes a methodology to measure the environmental losses caused by river fragmentation by accounting the change in the value of the so called environmental fragility. The Index of Environmental Losses by River Fragmentation (a non-monetary index) was applied in the Upper and Middle Uruguay River basin, located partially in the states of Santa Catarina and Rio Grande do Sul, in the FRAG-RIO Project study area. The results show that the index could account the portions of rivers more susceptible to fragmentation, enriching the discussion and providing guidelines for the environmental planning of the Uruguay River basin
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