The 2,200-Year-Old Water Machine: How Dujiangyan Tamed a River

Dujiangyan has guided the Minjiang River onto the Chengdu Plain for more than 2,200 years without a conventional storage dam at its historic headworks. Discover how Yuzui divides the river, Feishayan releases excess water and sediment, and Baopingkou controls flow into the irrigation network. The episode also explains why continued maintenance and reconstruction, rather than untouched ancient machinery, made the system endure. Inside this episode: - Where the Minjiang River meets the Chengdu Plain - How Yuzui divides the river - How Feishayan releases floodwater and sediment - How Baopingkou controls the irrigation intake - Why maintenance is part of the engineering Sources include UNESCO, ICOMOS, the International Commission on Irrigation and Drainage, and peer-reviewed hydraulic-engineering studies. This episode is a researched narrative summary. Historical records may be incomplete, translated differently, or interpreted differently by scholars. We distinguish documented facts, estimates, disputed interpretations, and later stories where material. Corrections are logged and incorporated into future editions. Follow Blueprints of Wonder for more researched stories about the structures that changed the world.