Why can the Dujiangyan Water Conservancy Project not only prevent floods but also store water for irrigation?

The water diversion embankment and the Pai Dam were built upstream of Lidui, dividing the Minjiang River into two branches: the Inner River and the Outer River. Water gates were built to regulate the water volume of the two rivers. From then on, the water flow of the Minjiang River was dispersed, which prevented flooding. floods, it also facilitated shipping and irrigation, and a comprehensive water conservancy project with multiple benefits of flood control, irrigation, and shipping was built.

The Dujiangyan Water Conservancy Project ensures the irrigation of about three million acres of fertile farmland, turning the Chengdu Plain into a "land of abundance" with guaranteed harvests despite droughts and floods. The Dujiangyan Water Conservancy Project still irrigates the Chengdu Plain and is the only water conservancy project in the world that is still in service today. The reason why we are able to serve today is because of the six most essential words - deep in the beach and low in the weir.

Extended information

Human environment

Dujiangyan Irrigation District is the most economically developed area in Sichuan Province and the political, economic and cultural center of Sichuan. It has the reputation of "a land of abundance" in history as it has "natural treasures, outstanding places and people". The natural landscape, cultural landscape, urban splendor and town scenery in the irrigation area are colorful and beautiful. The water conservancy in the irrigation area is dotted with stars, each with its own charm and characteristics, which is very pleasing to the eye. "Renmin Canal, Dongfeng Canal, Sanhe Weir, Tongji Weir, Bishui Dangbo; Heilongtan, Sancha The lake and Luban Reservoir are filled with rippling light; Longquan is pierced through, the heavenly workmanship opens up, and spiritual water springs up." The entire irrigation area presents a magnificent picture of "long dragons walking on the ground, Milky Way flowing across the sky; rainbows rising from deep valleys, high gorges emerging from flat lakes".

Baidu Encyclopedia - Dujiangyan Water Conservancy Project

Baidu Encyclopedia - Deep beach, low construction weir