When was Wang Jing and Wu Wang's project of harnessing the river completed, and what is the significance for future generations?

Although the project of Wang Jing and Wang Wuzhi River is huge, it is progressing smoothly. It took only one year from April (69), the twelfth year of Yongping, to complete the project in April the following year. Because of the huge project, the expenditure is certainly considerable. Wang Jingchuan said, "Although the service fee has been reduced on site, it is still tens of billions." After the management of Wang Jing and Wu Wang, the number of crevasses in this reach has been greatly reduced in a long historical period. It has been safe for about 800 years, and the river has not moved much. It was not until the early Northern Song Dynasty that Tianjin moved northward into the sea. For the Yellow River, which is good at silting up, making decisions and exercising, it can be said that it is a historical miracle to be peaceful for so long. It is believed that there are many reasons for this miracle, the most important of which is the low terrain, straight flow path and high engineering quality of this river determined by Wang Jing and Wu Wang.