The county has a submerged area of 55.5 square kilometers. In the submerged area of Kaixian, the level of economic development in the reservoir area is at the forefront, and is also the only plain alluvial valley flooded area. The entire county is the most flat, the most fertile land, the most densely populated and most economically prosperous, having the most well-off life.
The Three Gorges reservoir stored water up to a 175 meters level, included 224 units and 101 industrial and mining enterprises, counted 3335 residents of the Kaixian county old town, and was all completely removed.
On November 4, 2008, the Three Gorges Dam water storage pilot 172.3 meters, the old town, which has a history of 1800 years, was slowly submerged by rising river flooding.