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Level of river fragmentation and flow regulation

Level of river fragmentation and flow regulation

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Uploaded 16 Feb 2012 by GRID-Arendal
Year: 2009
From collection: Vital Water Graphics 2
Author: Philippe Rekacewicz (Le Monde diplomatique), March 2006
Description:
River fragmentation - The interruption of a river’s natural flow by dams, inter-basin transfers or water withdrawal - is an indicator of the degree to which rivers have been modified by man (Ward and Stanford, 1989, and Dynesius and Nilsson, 1994, as cited in Revenga et al., 2000). A fragmentation analysis carried out by the University of Umea and the World Resources Institute showed that, of 227 rivers assessed, 37% were strongly affected by fragmentation and altered flows, 23% were moderately affected, and 40% were unaffected. Analysis indicates that: - Strongly or moderately fragmented systems accounted for nearly 90% of the total water volume flowing through the rivers analyzed. - Strongly fragmented river systems are defined as 'rivers with less than a quarter of their main channel remaining without dams, where the largest tributary has at least one dam, as well as rivers where the annual flow pattern has changed substantially.' Fragmented rivers are only considered unaffect ...
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