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The oldest irrigation area in China is located in Sichuan.
It's Dujiangyan irrigation area. Dujiangyan Irrigation District, located in the middle of Sichuan Province, was built at the end of the Warring States Period, that is, more than 250 years BC. It is famous at home and abroad for its long history, huge scale and remarkable benefits. Dujiangyan Irrigation District takes water from Minjiang River at about 1km west of guanxian City, which plays a comprehensive role in irrigation, flood control, floating trees and power generation.

Irrigation area refers to an irrigation area with reliable water source, water diversion, transmission and distribution channel system and corresponding drainage channels. It is the product of human economic activities and develops with the development of social economy.

Because most irrigation areas in China were built in 1950s-1970s, due to the limitation of scientific and technological conditions at that time and years of fatigue operation, most irrigation areas in China were seriously aging and disrepair, and were in the state of extended service or sick operation, resulting in serious waste of water resources, low utilization rate of irrigation water and greatly reduced irrigation efficiency.

Dujiangyan irrigation area is located in the subtropical humid climate zone of Central China, with mild climate and fertile soil, and can harvest two or three crops a year. It is one of the important grain and oil bases in China. The average annual precipitation is 900~ 1240mm, and the rainfall distribution is uneven, which has the characteristics of spring drought, summer flood and winter drought.

The main reasons for the enduring Dujiangyan project are: the Minjiang River is rich in water resources, the irrigation area is superior in topography, the project layout is reasonable, and the management system is scientific and strict. In the long-term water control struggle, people constantly sum up experience, maintain and transform, so as to consolidate, improve and develop it.