Large Dams Just Aren’t Worth the Cost

Posted In Erosion, Inform
Oct
25

pak-ben-dam-laos
The Pak Beng dam, to be located north of Luang Prabang in northwestern Laos’ Oudomxay province. Pak Beng Dam, would create a stagnant reservoir, raise water levels behind the dam 40 feet, and back up the river near Huay Luk, forcing the resettlement of communities.
With a massive dam under construction in Laos and other dams on the way, the Mekong River is facing a wave of hydroelectric projects that could profoundly alter the river’s ecology and disrupt the food supplies of millions of people in Southeast Asia. Captions: Yale E 360. Photo source: International Rivers

Excerpts;

Thayer Scudder, an emeritus anthropology professor at the California Institute of Technology and the world’s leading authority on the impact of dams on poor people, describes his disillusionment with dams…

Large Dams Just Aren’t Worth the Cost, The New York Times

What Is A Large Dam? Questions and Answers About Large Dams by International Rivers
A large dam is defined by the dam industry as one higher than 15 metres (taller than a four-story building). There are more than 40,000 large dams worldwide. There are more than 300 major dams – giants which meet one of a number of criteria on height (at least 150 metres), dam volume and reservoir volume…

Read Full Article: “World’s Largest Dam Removal Unleashes U.S. River After Century of Electric Production,” National Geographic
The blasts will destroy the last 30 feet of the 210-foot-high dam and will signal the culmination of the largest dam-removal project in the world.
In Asia, Africa, and South America, large hydroelectric dams are still being built, as they once were in the United States, to power economic development, with the added argument now that the electricity they provide is free of greenhouse gas emissions. But while the U.S. still benefits from the large dams it built in the 20th century, there’s a growing recognition that in some cases, at least, dambuilding went too far—and the Elwha River is a symbol of that…

Elwha, The Grand Experiment (11-12-2012)

Controversial dam projects – in pictures, The Guardian UK
A look is taken at some of the world’s most contentious dam projects, from the Three Gorges in China to Brazil’s Belo Monte dam.

Sediment Trapped Behind Dams Makes Them ‘Hot Spots’ for Greenhouse Gas Emissions
The large reservoirs of water behind the world’s 50,000 large dams are a known source of methane. Methane has a warming effect 25 times more powerful than carbon dioxide. That knowledge led to questions about hydroelectric power’s image as a green and nonpolluting energy source…

Small Dams On Chinese River Harm Environment More Than Expected, study finds, NSF (05-30-2013)

DamNation; a Documentary That’s Testing the Waters of Corporate Social Responsibility; From Felt Soul Media
DamNation is a feature documentary, shown this week at SXSW in Austin, Tx. DamNation’s majestic cinematography and unexpected discoveries move through rivers and landscapes altered by dams, but also through a metamorphosis in values, from conquest of the natural world to knowing ourselves as part of nature…

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