1. Dujiangyan is a world cultural heritage (included in the "World Cultural Heritage" list by UNESCO in 2000), a world irrigation engineering heritage, a national key cultural relics protection unit, a national scenic spot, and a national AAAAA level tourist attraction. Dujiangyan scenic spots mainly include Fulong Temple, Erwang Temple, Anlan Cable Bridge, Yuleiguan, Lidui Park, Yuleishan Park, Yunv Peak, Lingyan Temple, Puzhao Temple, Cuiyue Lake, Dujiangyan Water Conservancy Project, etc.
2. One of the famous water conservancy projects in ancient China. In the middle reaches of the Minjiang River in the northwest of Dujiangyan City, Sichuan. In ancient times, it was located in Du'an County and was called Du'an Weir. It was named after the Song and Yuan Dynasties. The Minjiang River, which originates from the Yangpauling Mountains in the south of the Minshan Mountains, has a strong water source. It transfers from the mountainous area to the Chengdu Plain. The flow rate drops sharply, making it easy to swim and break. Before the construction of the water conservancy project, the floods were particularly serious.
3. In the early days of the Warring States Period, the Prime Minister of Shu Kaiming conquered Yulei Mountain and diverted water from the Minjiang River to eliminate floods. As a result, "the people in Pixian County and Chengdu had land" ("The Book of the King of Shu"). At the time of King Zhao of Qin, Li Bing and his son, the governor of Shu County, inspected the water veins, adapted measures to local conditions, and took advantage of the situation. They basically completed the drainage and irrigation water conservancy project of Dujiangyan. As a result, the Chengdu Plain was "a thousand miles of fertile land, known as land and sea."
4 , ("Huayang Guozhi") Later generations have repeatedly expanded it. The main facility is in the center of the Minjiang River. Bamboo cages are filled with pebbles and piled up into a fish mouth-shaped water diversion project. The Jingang Dike is connected below, so that the Minjiang River is divided into outer rivers. and Neijiang two shares. The outer river is the normal flow of the Minjiang River, and there are many irrigation channels in the lower reaches, which also serve as flood drainage; the inner river is an artificial channel, and Yulei Mountain is carved into the mouth of the treasure bottle. From there, it turns into the Zouma River.
5. Puyang River and Baitiao River penetrate into the Chengdu Plain and become channels for irrigation and navigation. Near Dujiangyan, projects such as Pingshui Cao and Feishayan were also built to drain water into the outer river, so that excessive floods and sediment entering the inner river can be automatically discharged back to the outer river to ensure the safety of the inner river irrigation area. The river bottom near Dujiangyan is often filled and silted up by gravel and pebbles. It must be outside the river every year.
6. Neijiang rivers are cut off in turn with wooden poles to facilitate excavation. Later generations formulated the annual repair principle of "cleaning the beach deeply and building weirs low", and the eight-character water control policy of "cutting corners when encountering twists and turns, and drawing attention to the right times". The total irrigated area of ??the inner and outer rivers below Dujiangyan once reached more than 3 million acres. Later, the project fell into disrepair and the irrigated area gradually decreased to more than 2 million acres. After the founding of the People's Republic of China, after renovation and expansion, the irrigation area has now expanded to more than 8 million acres.