issues
support pci
Use Your Roof
Related Report
Lost in Development’s Shadow: The Downstream Human Consequences of Dams
Sandra Postel
Published Jun 13, 2010
A report by
Brian D. Richter
Director, Global Freshwater Program, The Nature Conservancy, Charlottesville, Virginia, USA
Sandra Postel
Director, Global Water Policy Project, Los Lunas, NM, USA
Carmen Revenga
Senior Freshwater Scientist, The Nature Conservancy, Arlington, VA, USA
Thayer Scudder
Professor of Anthropology, Emeritus, California Institute of Technology, Pasadena, CA, USA
Bernhard Lehner
Assistant Professor of Global Hydrology, McGill University, Montreal, Quebec, Canada
Allegra Churchill
Master’s Candidate, University of Virginia, Dept of Landscape Architecture, Charlottesville, VA, USA
Morgan Chow
Research Analyst, The Nature Conservancy, Arlington, VA, USA
Abstract
The World Commission on Dams (WCD) report documented a number of social and environmental problems observed in dam development projects. The WCD gave particular emphasis to the challenges of properly resettling populations physically displaced by dams, and estimated the total number of people directly displaced at 40-80 million. Less attention has been given, however, to populations living downstream of dams whose livelihoods have been affected by dam-induced alterations of river flows. By substantially changing natural flow patterns and blocking movements of fish and other animals, large dams can severely disrupt natural riverine production systems – especially fisheries, flood-recession agriculture and dry-season grazing. We offer here the first global estimate of the number of river-dependent people potentially affected by dam-induced changes in river flows and other ecosystem conditions. Our conservative estimate of 472 million river-dependent people living downstream of large dams along impacted river reaches lends urgency to the need for more comprehensive assessments of dam costs and benefits, as well as to the social inequities between dam beneficiaries and those potentially disadvantaged by dam projects. We conclude with three key steps in dam development processes that could substantially alleviate the damaging downstream impacts of dams.
Photo credit: Nicholas_T/flickr
Like this report?
Keep the information flowing: Donate to Post Carbon Institute
Stay connected: Receive our monthly e-newsletter
Reposting: See our reposting policy
meet our fellows
what is pci?
