ABSTRACT
The key to the Three Gorges Water Conservancy Project (TGP) is in the Xiling Gorge along the Three Gorges section on the main channel of the Changjiang (Yangtze) River. The proposed dam site is located at Sandouping, in the municipality of Yichang in Hubei province, 47 km upstream of the city of Yichang. The proposed dam will control a drainage area of about one million km2, approximately 56 percent of the Changjiang River's total drainage area of 1.8 million km2. At the dam site, the average annual flow is 450 billion m3, approximately one-half of the river's total amount of 960 billion m3.
