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Gezhouba Dam Complex Project
 

Gezhouba Project is located in Yichang City of Hubei Province, 38 kilometers (23 miles) away from the Three Gorges Project (hereunder abbreviated as TGP). As the experimental project of the TGP, it is the first large-scale hydropower project on the main stream of the Yangtze River.

When the Yangtze River goes through the Nanjin Pass, the river suddenly becomes a lot broader, widening from 300 meters (0.2 miles) to 2,200 meters (1.4 miles). The dam divides the Yangtze River into three parts, which are respectively called Da Jiang, Er Jiang and San Jiang in a south to north order.

The project was started in 1971 and finished in 1988. The main structures of the project consist of the power station, navigation locks, sluice-gates and water retaining facilities. The dam is a typical barrage dam, with the maximum height of 47m and total storage capacity of 1.58 billion m3.

The project has a drainage area of 1 million km2, accounting for 55.5% of the total of Yangtze River. The annual average flow rate at the site is 14300 m3/s; the annual runoff is 451 billion 14300 m3; and the annual average sediment inflow is 530 million tons.

The project provides benefits of power generation, navigation improvement among others. The power generation, including Da Jiang and Er Jiang, is installed with 21 generating units with a total installed capacity of 2,715 MW, a firm power output of 768 MW and an annual energy output of 15.7 TWh (a firm power output of 1580 ~1940 MW and an annual energy output of 16.1 TWh when TGP is completed).