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Rivers without Boundaries (RwB) International Coalition is developing relatively simple, but comprehensive express-assessment method that allows to compare basin-wide environmental impacts of various water infrastructure development scenarios. Methodology is based on semi-quantitative assessment of cumulative impacts of flow alteration, basin fragmentation and creation of anthropogenic water reservoir in place of natural river ecosystem. We analyze how these impacts from one or several dams affect known environmental values in a given river basin. All measures of impact we use were suggested in scientific literature and our innovation is in combining them in one effective and transparent assessment tool, that could be customized and adapted according to situation in a given basin under assessment. Assessment results also allow to compare how much impact is caused per unit of produced energy providing a rough measure of ecological efficiency.

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