Sichuan and Chongqing Feature

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Dam the Yangtze

Nearly a century ago, Chinese leader Sun Yat-sen first proposed damming the Three Gorges area of the Yangtze River, a project that subsequently appealed to Chiang Kai-shek and even the invading Japanese, both of whom prepared plans for the project.

It wasn't until the 1990s under the Communist government that China began building the world's largest power generator, the Three Gorges Dam. In addition to power generation, the dam's locks are big enough to handle containerized sea barges, allowing Chongqing to be the world's farthest inland seaport.

Construction of the main body of the Three Gorges Dam was finished in 2006, and the 26th generator was installed in late 2008. Eight additional generators bring total power generation capacity to an unmatched 22.5 gigawatts.

Even in China, the sheer scale of this project is staggering. The $26 billion dam is more than 600 feet high and a mile wide. By 2010 it had an installed capacity of 18.2 gigawatts and was able to generate 80,000 gigawatt-hours of power annually.

As with any infrastructure project of its scope, the dam has been controversial from the beginning, with critics focusing on its massive social, cultural, and environmental costs.

The reservoir created by the flooding of the Three Gorges area was preceded by the forced relocation of more than 1.2 million people. Many of these people are now migrant workers in nearby cities.

The rising river levels also resulted in the submerging of many significant and valuable relics and buildings dating back to the beginning of Chinese civilization. Although some artifacts and buildings were moved uphill, it is widely acknowledged that the flooding of the gorges incurred major cultural losses.

It is the environmental impact of the dam project that has attracted the most negative publicity, with serious potential ramifications both upstream and downstream from the dam.

Behind the dam, millions of acres of forest were drowned, and landslides have become a bigger problem than before. The reduced ability of the Yangtze to flush itself clean of wastewater and other pollution has led to the reservoir's containing higher levels of pollution than the river did before damming.

Downstream, it is the lack of sediment that threatens riverbanks, which could become more prone to flooding. The economic dynamo of Shanghai, which is built on the river's floodplain, could also become more vulnerable to inundation after being deprived of normal silt deposits.

While disaster has been averted so far, heavy rains have provided a jittery first major test for the dam, which almost filled to capacity. There are also concerns about cracks already appearing in the dam and its seismological impact.

Updated: 01-2014

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