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The Weir built 2500 years ago is one of the very few ancient irrigation works, which still make the benefit up till now. By the way to construct three main sections: spillway, intake work, bifurcation dyke, it scientifically solved the problems of dividing the current of rivers into separate routes, draining off sand and controlling the discharge of flow, automatically. The Weir not only removes the water dangers away and also makes Si Chuan plain become a Nature's Storehouse where floods and droughts are under the control. After being developed several times, the weir can irrigate farmlands over 5300 square km. besides, the scenery around Du Jiang Yan Weir is very beautiful and many ancient historical sites are still there.
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