One day, Li Bing was called into the palace and told him, "Now there is no one in Shu County, and North Korea wants to send you to make a secretariat, but Qin has not been included there long, and people are uncertain." I wonder what method you can use to govern? "
Li Bing said: "I don't have any panacea, but I believe that if you devote yourself to the welfare of the people, they will encourage you." Item is very satisfied with Li Bing's answer. So he was sent to Shu County to make a secretariat.
When Bing arrived in Shu County, he immediately began to understand the people's feelings. He saw that Chengdu Plain was vast and fertile, but inaccessible and very poor. There is not much arable land for reclamation. He is very confused. He asked the locals first. An old man pointed to the Minjiang River around Chengdu Plain and said to him, "This is because this harmful river has been flooded every year since I was a child. Not only the crops are harvested, but also the villages need to be completely swallowed up. Adults are two years late, and I am afraid that even people will move out. "
Li Bing wakes up like a dream. He made up his mind to attract the river for the benefit of the local people. He first made a comprehensive investigation of the Minjiang River and went deep into the mountains along the source of the Minjiang River several times. Not afraid of wading through mountains and rivers, drifting along the river, I went straight to the intersection of Minjiang River and Yangtze River and learned first-hand materials about Minjiang River. He found that the Minjiang River is located in the source area, with high mountains and deep valleys on both sides of the Linjiang Strait, rich in water resources and surging;
In guanxian, the terrain is more and more flat, and the water is smooth, usually rushing to the river bank; A large amount of fine sand brought from upstream and downstream is also easy to deposit here, raising the river; Especially in the southwest of guanxian, there is a Leiyu Mountain, which blocks the river from flowing eastward. Every summer and autumn flood season, running water can't be discharged, which often leads to drought in the east and waterlogging in the west. These are the important reasons for frequent floods in Chengdu Plain.
Li Bing believes that in order to eliminate floods, roads must be widely built on the plains. First, floods can be discharged, and second, irrigation and production can be developed. If you want to pour water into the canal, you must dig Leiyu Mountain, so that the water in Minjiang River can be high.
Through careful scheme planning, libing decided to gradually guide the migrant workers in Leiyushan to dig a 20-meter-wide borrowing hole in Leiyushan, which was called "Baojingkou". Later, in the middle of the river, the water flow was divided into two by building a weir plate, forcing one of the main branches to flow into the bottle mouth. Before the weir, it began to look like a fish head with chopped peppers, hence the name "fish mouth".
It faces the upper and lower reaches of the Minjiang River and divides the turbulent water into two goods. The western share is called Waijiang, which is the positive flow of Minjiang River. Neijiang, the east branch, is the main canal of irrigation canal system, and the head of the canal is the bottle mouth. He personally planned and built many channels of different sizes, forming a winding fan-shaped water system. This is also the main structure of Dujiangyan.
Later, a flat sump and a "flying sand weir" spillway were built at the tail end of the fishmouth weir plate for flood diversion because of further manipulation of the water flow velocity injected into the bottle mouth. When the water level in Neijiang River is too high, the flood will flood the Sha Fei weir through the horizontal flume and pour into the outer river, which can fully protect the irrigation project from flooding. At the same time, due to the vortex effect of water injected into the outer river, the fine sand deposited before and after the bottle mouth is effectively washed away. This kind of auxiliary equipment makes Dujiangyan a grand and meticulous project.
The ice has exhausted its energy, but it hasn't reached it yet. Considering the maintenance and long-term application of the project, he established a series of maintenance and supervision methods, some of which are still used by people today. After the completion of Dujiangyan, the flood and drought disasters in Chengdu Plain were eliminated, and the manufacturing industry developed rapidly.
Li Bing made a very comprehensive survey of the Minjiang River, looked for the source of the Minjiang River, and did many courses to understand the causes of frequent floods in Chengdu Plain. Therefore, Li Bing wants to build a road on the plain, which can not only flood the reservoir but also irrigate the farmland and promote the local agricultural development. Therefore, Li Bing personally led the migrant workers to go far away in Leiyushan, and opened a big borrowing hole to split the water flow in two, so that one of the main tributaries would flow to Baokoukou, so that the remaining one would not be flooded because of the shrinking water.
That is also the core work of Dujiangyan, but Li Bing certainly can't complete such a large amount of tasks himself, so Li Bing's son also took over the construction of Dujiangyan. Because Bing was sent by Zhao Xiang, the king of Qin, Bing belongs to a senior official of Qin, and Dujiangyan naturally belongs to Qin.
Besides Dujiangyan, Li Bing also organized other water conservancy and hydropower projects in Shu County. When foaming at the water (alias "Dangjiao Water"), Li Bing organized the people to dig the rocks in the middle of the river and tidy up the waterways, which facilitated navigation. He dredged Guanjiang, Wenjing and Luoshui. In Guangdu and Yanjing Town, it was excavated. All these have made important contributions to the development and design of Chengdu Plain and the development of trend agriculture.
Because Li Bing is dedicated to the welfare of the people, Li Bing has been respected by the people of Sichuan for thousands of years and is honored as the "master of Sichuan". There are also "Chuanzhu Temple" all over Sichuan, which shows the people's nostalgia for him.