What's wrong with the Wang Nan section of the Canal? Who solved it? How? There is a reward of 20 points, urgent.

When the Beijing-Hangzhou Canal was dug in the Yuan Dynasty, Wang Nan, as the "water ridge" of the Grand Canal, became a difficult problem for the canal to be unblocked. In the early Ming Dynasty, Song Li, the minister of the Ministry of Industry, and Bai Ying, a folk water conservancy worker in Wenshang, built a dam in Daicun to build a water diversion project, which made Wenshui go west, enter the canal from Wang Nan, and flow northward at seven points, and enter Yanzhou and Weifang. Three points flow south and enter Huanghuai. Since then, Longwang Temple was built in Fenshui, so it is called "Fenshui Longwang Temple". Wang Nan Water Diversion Hub was built by Shang Shu Song Li, Minister of Industry in the 9th year of Yongle, at the suggestion of Bai Ying, an old man in Wenshang.

The project is completed. First, build a dam in Wenshang to intercept Wenshui; Then excavate Xiaowen River to make Wenshui reach Wang Nan for water diversion; Next, guide the spring water to replenish the source, that is, collect and guide the spring water in the northeast of Wenshang County to flow into the spring river for water distribution; Finally, a stone slope protection was built at the T-shaped entrance of Xiaowen River, and a fish mouth was built to divert the water from north to south. Wang Nan Water Diversion Project takes the dredging of the Three Lakes as the water source hub, and builds a dam to regulate the water volume and ensure the smooth water transportation, which is comparable to Dujiangyan. The dam site selection of Wang Nan Water Diversion Project is reasonable, because Daicun is an ideal commanding height to curb the economic transportation of Wenhe River, which conforms to the natural law of water flowing downwards, and dredges the three lakes from Wangnanshuiling. Bai Ying grasped the four links of "introduction, storage, separation and discharge", and realized proper storage and discharge and convenient application. This project is highly scientific, and it is a great pioneering work in the history of the Beijing-Hangzhou Grand Canal in China.