be located

Chengdu plain

In the west, the Minjiang River flows from the valley into the plain. Before Dujiangyan was built, the Minjiang River rushed into the plain in the rainy season and was often flooded. When there is insufficient rain, it will cause drought again. In order to turn harm into benefit, Li Bing, the prefect of Shu County of Qin State, presided over the construction.

Dujiangyan irrigation system

The general principle of Dujiangyan project is simply to "build a dam to divert water and build a canal to divert water". Divide the Minjiang River into two streams, one of which is imported.

Chengdu plain

This can not only divert floods and reduce disasters, but also divert water to irrigate fields and turn harm into benefit. The main works of Dujiangyan include Yuzui diversion dike, Sha Fei weir spillway and Baojiangkou water intake.

The first is to build a water diversion project at the mouth of Baokou, which will divide the Minjiang River into two parts and make the Minjiang River flow eastward.

Chengdu plain

At the same time, reduce the flow of rivers in the west, so that the rivers in the west will no longer flood, and at the same time alleviate the drought in the Chengdu Plain in the east and irrigate the fertile fields there.

Although Baokou Port has played a role in water diversion and irrigation, it is difficult for the river to flow into Baokou Port because of the high terrain in the east of the river. In order to make the Minjiang River flow eastward smoothly and maintain a certain flow rate, and give full play to the flood diversion and irrigation function of Baokou Port, a diversion weir "fish mouth" was built on the Minjiang River, forcing a large amount of river water to flow into Baokou Port.