Why Yichang is still submerged by the Three Gorges Dam?

First of all, we should know that the flood control function of the Three Gorges Dam is not omnipotent. Even if the flood upstream of the dam is too big, it will definitely rise. This is the law of nature, and manpower cannot completely resist the forces of nature.

The second one is about floods. The regulation of the Three Gorges Dam only covers the first line of the Yangtze River, especially where the Yangtze River flows in the middle and lower reaches. For other places, such as the tributaries of the Yangtze River, if there is too much sudden precipitation, it is not good for flood control, and the reach that does not inject into the Yangtze River will form a flood. This is because there are still many floods in the Yangtze River basin. The other is the guilt of the city.

Extended data:

In 2000, the concrete pouring volume of the Three Gorges Project was 54810.7 million cubic meters, and the monthly pouring volume was as high as 550,000 cubic meters, which set a world record for concrete pouring and was the most difficult water conservancy project in the world. The Three Gorges Project is the largest water conservancy project during the construction period, with the interception flow of 90 10 m3/s and the maximum flood peak flow of construction diversion of 79,000m3/s. ..

The maximum flood discharge capacity of the spillway gate of the Three Gorges Project is102500m3 per second, which is the largest flood discharge capacity in the world. The lock of the Three Gorges Project is a five-stage double-track ship with total head 1 13m, which is the inland river lock with the largest number of stages and the highest total head in the world. The effective size of the ship lift of the Three Gorges Project is 120× 18× 3.5m, and the maximum lift is 1 13m.

Water weight 1 1800 tons, tonnage of 3000 tons, the ship lift is the largest and most difficult in the world. The dynamic resettlement of Three Gorges Reservoir can eventually reach110.3 million people, which is the largest reservoir resettlement project in the world and the most difficult work.

Baidu Encyclopedia-Three Gorges Dam