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http://www.shoutwire.com/viewstory/74670/NASA_Satellites_Watch_As_China_Constructs_Giant_Dam
ome call it the eighth wonder of world. Others say it's the next Great Wall of China. Upon completion in 2009, the Three Gorges Dam along China?s Yangtze River will be the world's largest hydroelectric power generator and one of the few man-made structures so enormous that it's actually visible to the naked eye from space. NASA's Landsat satellites have provided detailed, vivid views of the dam since construction began in 1994.
The Yangtze River is the third largest river in the world, stretching more than 3,900 miles across China before reaching its mouth near Shanghai. Historically, the river has been prone to massive flooding, overflowing its banks about once every ten years. The dam is designed to greatly improve flood control on the river and protect the 15 million people and 3.7 million acres of farmland in the lower Yangtze flood plains.
Observations from the NASA-built Landsat satellites provide an overview of the dam's construction. The first image shows the region prior to start of the project. By 2000, construction along each riverbank was underway, but sediment-filled water still flowed through a narrow channel near the river?s south bank. The 2004 images show limited development of the main wall and the partial filling of the reservoir, including numerous side canyons. By mid-2006, construction of the main wall was completed and a reservoir more than 2 miles (3 kilometers) across had filled just upstream of the dam.
Engineered to store more than 5 trillion gallons of water, the Three Gorges Dam is designed to produce more than 18,000 megawatts of electricity when all 26 turbines become operational in 2009?twenty times the power of Hoover Dam. The reservoir will also allow 10,000-ton freighters to enter the nation's interior, opening a region burgeoning with agricultural and manufactured products, increasing commercial shipping access to China's cities.

