Dujiangyan Fish-mouth Water-dividing Dike

龙龙🐉妈

5.0/5

Outstanding

1. Engineering Miracle: The Dujiangyan Irrigation System, the first major waterway of the Minjiang River, lies across the river, dividing it into inner and outer canals. During dry seasons, 60% of the water in the inner canal and 40% in the outer canal are used for irrigation; during floods, the outer canal discharges 60% of the water. Its bend-based circulation system achieves a 20/80 sediment discharge (80% of sediment flows to the outer canal). Without high dams, relying solely on topography and water flow, it has operated continuously for over 2200 years, a feat rarely seen in the history of world water conservancy. 2. Historical and Cultural Significance: Construction began in 256 BC under the supervision of Li Bing. From ancient methods using bamboo cages and pebbles to later reinforcements with iron oxen and stone masonry, it is a core landmark of both the World Cultural Heritage and World Irrigation Engineering Heritage sites, embodying the water management philosophy of "utilizing natural forces and following the laws of nature."