It belongs to the policy of opening floodgates and releasing water.

The policy of opening floodgates and releasing water is to transfer water from South to North.

South-to-North water diversion

From 2065438 to September 2002, the relocation of migrants in Danjiangkou reservoir area of the Middle Route of South-to-North Water Transfer Project was fully completed. The South-to-North Water Transfer Project mainly solves the problem of water shortage in northern China, especially in the Huang-Huai-Hai River Basin, with a population of 438 million. * * * There are three water transfer lines, namely, the east line, the middle line and the west line, which are respectively connected with the Yangtze River, the Yellow River, the Huaihe River and the Haihe River.

Form an overall layout with four horizontals and three verticals as the main body, and realize the rational allocation pattern of water resources in China, that is, north-south allocation and east-west mutual assistance. The middle route project of South-to-North Water Transfer Project and the first phase project of East Route of South-to-North Water Transfer Project have been completed, and water has been transferred to the northern region. The west line project is still in the planning stage, and construction has not started.

As of June 3, 2020, the first phase of the Middle Route of South-to-North Water Transfer Project has safely delivered water for 2,000 days, with a cumulative delivery of 30 billion cubic meters to the north, benefiting 60 million people along the route. Among them, the safety factor of water supply in the central city of Beijing has increased from 1 to 1.2, and the shallow groundwater level in Hebei Province has increased from 0.48 meters per year before treatment to 0.74 meters. ?