Ningwu county Guancen Mountain Watershed Village. Yongding River, formerly known as Flood Control, Sanggan River, Lugou River, Hunhe River and Wuding River. It is one of the seven major water systems in Haihe River Basin. It flows through Inner Mongolia, Shanxi and Hebei provinces, Beijing and Tianjin, and 43 counties and cities, and joins the North Canal at Qujiadian. Part of the flood flows from the North Canal into the Haihe River, and most of the flood flows into the Bohai Sea through Yongding New River in Beitang Town, Tianjin Binhai New Area. The upper reaches of Yongding River flows through the Loess Plateau, and the river has a large sediment concentration, so it is called "Little Yellow River" and "Hunhe River". The lower reaches of the river form an overground river due to sediment deposition, and its migration is uncertain, so it used to be called "Wuding River".

Historically, Yongding River is the most seriously flooded river in Haihe River system. During the 834 years from the Jin Dynasty to the founding of the People's Republic of China, the Yongding River burst 8 1 time and changed its course 9 times. During the more than 250 years since dykes were built in the lower reaches of the Qing Dynasty, the crevasse overflowed 78 times, with an average flood in less than 4 years. After the Jin Dynasty, the flood records of Yongding River were more detailed, and the records in Qing Dynasty were the most complete. After that, the northern warlords scuffled, then Japan invaded China, and then the three-year war of liberation. At this stage, there is a lack of systematic information except sporadic records. Before the Qing Dynasty, there was no flow record and no detailed disaster statistics. Therefore, by consulting historical records, we can only know the frequency of floods and the general situation of remediation.