Yuzui watershed dike: "fish head" is a watershed project of Dujiangyan, named for its shape, such as fish head, it Angtou in the middle of the river Minjiang River, the Minjiang River is divided into internal and external 2. Jiang called the outer west, commonly known as "Golden Horse River" is a positive flow of Minjiang River, is mainly used for drainage; eastern edge of the foot called Neijiang, is artificial artificial water channels, mainly for irrigation. Fish head in the first three major projects, such as head shape, hence the name fish head. King dike is one of convergence with the fish head watershed embankment. Fish head, Diamond embankment in the Second Temple before the middle of the river Minjiang River, the Minjiang River is divided into inside and outside the Second River. The right side of the Minjiang River is flows - foreign River, mainly for flood sediment; the left side of the artificial water channels - Neijiang, mainly for irrigation. Neijiang Minjiang mainstream straight dry season, when the river is about within the sub-Liu Cheng, outside the river about four percent; flood period, the fish head was submerged sandbar before, no longer constrained by the corner, outside the mainstream of straight river, At this point the proportion of inside and outside the river water will be automatically reversed. This is the Dujiangyan "points 46, drought Liaohe level" of magic. Also, because the role of circulation and curved "concave bank drainage, convex bank sediment" in principle, fish head also has a significant and sediment features. Mix the river each year goes by the quality of the total 70-80%, are outside the river discharge.
