图 位于四川成都平原的都江堰，建立与秦代，经过李冰父子几代人的建设完成

The picture is located in Dujiangyan on the Chengdu Plain in Sichuan Province. It was established in the Qin Dynasty and was completed by Li Bing and his sons for several generations. Its main part is composed of fish mouth, aquarium mouth, and Feisha weir, which can control the flow rate and flow of the channel through intervention in the river bed. Therefore, whether it is in the dry season or the rainy season, the Chengdu Plain can obtain sufficient irrigation water. In addition, it has strong ecological significance. Unlike modern dams, Dujiangyan uses Kuanglou and other facilities to build temporary dams. Sealed, the gap can allow some aquatic organisms to pass smoothly, which is of great significance for migratory aquatic animals in the basin. It is a model of harmony between man and nature. <br>The construction of Dujiangyan also has its peculiarities. The river is curved, slowed down, and interspersed with mountains and rivers, which played a basic role in the formation of the weir. However, the fact that Li Bing and his sons were able to choose this place for construction in many areas shows that the ancients already knew well. The importance of topography.

Figure Located in Dujiangyan, Chengdu Plain, Sichuan Province, established with the Qin Dynasty, after Li Bing father and son generations of construction completed, its main part has fish mouth, bao bottle mouth, flying sand, through the intervention of the river bed to control the flow rate and flow of the canal, so whether it is dry or rainy season, Chengdu Plain can obtain adequate irrigation water, in addition to it has a strong ecological significance, different from modern dam, with The Dujiangyan Building and other facilities to establish temporary dam, and not sealed. The gap can make some aquatic organisms pass smoothly, which is of great significance to migratory aquatic animals in the basin. It is a model of the unity of heaven and man.<br>Dujiangyan's construction also has its particularity, the river water belongs to the bend, slow down, and between mountains and rivers, for the composition of the body played a fundamental role, but Li Bing father and son can be selected in many areas of this place to build, can show that the ancients already know the importance of the land.

Fig Dujiangyan, located in Chengdu Plain of Sichuan Province, was established in the Qin Dynasty. After several generations of Li Bing and his son, the main part of Dujiangyan is composed of fish mouth, baopingkou and Feisha weir. It can control the flow rate and flow of the channel through the intervention of riverbed. Therefore, Chengdu Plain can obtain sufficient irrigation water in both dry and rainy seasons. In addition, it has a strong ecological significance Different from the modern dam body, the temporary dam body of Dujiangyan is built by Kuang Lou and other facilities, which is not completely sealed. The gap can allow some aquatic organisms to pass through smoothly, which is of great significance to the migratory aquatic animals in the basin. It is a model of the unity of man and nature.<br>The construction of Dujiang Weir also has its own particularity. The river water is curved, decelerating, and alternating mountains and rivers, which play a basic role in the formation of the weir body. However, Li Bing and his son were able to select this place for construction in many areas, which shows that the ancients knew the importance of skillfully borrowing the terrain.<br>