Grand Coulee Dam is one of the largest concrete structures in the world. It contains nearly 12 million cubic yards of concrete; enough to build a sidewalk four feet wide and four inches thick around the equator (50,000 miles) twice. Grand Coulee Dam is one of the wonders of the modern world. The discharge tubes on the face of the dam are 8.5 feet in diameter, wide enough to fit a full size truck in one of them. They are used to pass water through the dam when the elevation of the water in the lake is lower than the drum gates at the top of the spillway. Grand Coulee Dam is the largest hydropower producer in the United States with a total generating capacity of 6,809 megawatts. It is the fourth largest producer in the world. The top producing dams are Three Gorges Dam in China at 20,000 megawatts, Guri Dam in Venezuela at 10,000 megawatts, and the Itaipu Dam on the border of Paraguay and Brazil with 12,500 megawatts. More info at http://tinyurl.com/yhtqbl9 #Grand_Coulee_Dam
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