The California Dam in the United States is the world's super dam. Has the United States ever been worried?

1\ Three Gorges immigrants will bring environmental and social problems. After millions of new immigrants moved into the vicinity of the Three Gorges reservoir area, so many immigrants wanted to live here, and the limited cultivated land could not afford it, which forced the new immigrants to open up wasteland, aggravated the destruction of natural vegetation, and made the soil erosion more serious, followed by the acceleration of reservoir siltation. Once the forest vegetation in the reservoir area is destroyed, the habitat of biological population will also shrink, and the ecological environment in the Three Gorges area will inevitably fall into a vicious circle. 2. The Three Gorges Reservoir itself will worsen the ecological environment. Hydropower itself may not directly cause pollution, but reservoirs built for hydropower may cause serious environmental pollution. Building dams and using hydropower will not only create new pollution sources, but also turn some valuable and reusable resources into endangered resources or make them extinct. 3\ Siltation in Three Gorges Reservoir poses a serious threat. Sediment deposition in the Three Gorges has always been a big concern of the public. Can the dam really solve the problem of stone sediment deposition? Mr. Huang Wanli asserted that the harm of sediment deposition in the Three Gorges is not sediment, but pebbles. After the dam is repaired, the pebbles discharged from Kuimen every year will not be discharged. Chongqing Port may be blocked within 10, and it will extend upstream year by year, flooding Jiangjin and Hechuan areas in flood season. 4\ The Three Gorges Reservoir cannot prevent siltation and flood control. Because the Three Gorges Reservoir relies on flood discharge in flood season to prevent siltation, it is actually impossible to store water for flood control in flood season. If the Three Gorges Reservoir wants to store flood water in flood season, it must reduce the amount of underwater discharge, so a large amount of sediment brought by river water can not be discharged from the reservoir in flood season, and serious siltation of the reservoir can not be avoided. In a word, if the Three Gorges Reservoir is for flood control, the reservoir will be silted, and if it is for flood control, the downstream will be threatened by flood. The Three Gorges Project will make navigation in the Yangtze River more difficult. The Yangtze River is a busy waterway, which could have sailed directly from Shanghai to Yibin. After the completion of the Three Gorges Reservoir, the navigation conditions will obviously deteriorate. It is planned to build a five-level lock on the Three Gorges Dam. As long as one gate is broken, the five-level lock will be completely paralyzed and navigation will be completely interrupted. 6. The Three Gorges Project will induce various geological disasters. In the history of large-scale reservoir construction in the world, there have been many cases of reservoir-induced earthquakes. After the impoundment of the Three Gorges Project, shallow karst collapse and reservoir bank adjustment will lead to microseisms and extremely microseisms. 7\ The Three Gorges Project will inundate many cultural relics and historical sites, and money cannot make up for the loss of a large number of precious cultural relics and historical sites in the Three Gorges reservoir area. Famous historical sites at home and abroad, such as Du Feng Ghost Town, Fengjie Bai Di, Zhangfei Temple, Quyuan Temple, Zhaojun's hometown, etc. , will be flooded, nothing. How will these irreparable losses be estimated? 8\ Corruption is easy to occur in the project, which will be greatly deteriorated. Such a huge project and such a large amount of capital investment have always been a hotbed of corruption. The Three Gorges Project takes a long time, and it is difficult to manage every link in the whole project by experience. The Three Gorges Dam is easy to become a military target. From the perspective of national defense, the dam is one of the main targets in military confrontation, and it is also one of the main targets destroyed and threatened by terrorists. In international military and political competitions, the party that owns the dam is in a passive position. However, it is worth noting that these problems have attracted great attention of leaders at all levels, hoping to be solved.