Engineering background of large universities' entry into Qin.

This grand project is located in the western marginal mountainous area of Gansu Province, with complex geological conditions, arduous project and many lines. The total length of main canal and drainage main canal is 205.7 kilometers, and the total length of 45 branch canals is 67.5 kilometers. There are many buildings, mainly tunnels. There are 77 tunnels in the whole project, with a total length of 1 10 km, of which 3 1 tunnel exceeds 1 km. 29 aqueducts; 3 inverted siphons; There are more than 4500 buildings above the branch canal. The section from the head of Tang Tian Temple Canal in Tianzhu County to the main sluice of Xianglushan on the west bank of Zhuanglang River in Yongdeng County is the main canal, and then the water is delivered to Dongyi Main Canal and Dong Er Main Canal, and 45 branch canals are delivered to Qinwangchuan Irrigation District. The total length of the trunk and branch canals is 868 kilometers, which is 3.7 times the length of the project of "Diversing Luanhe River into Tianjin".

The project of transferring water to Qin spans six counties (districts) and mountainous areas in Gansu and Qinghai provinces. The project is arduous, the construction conditions are complex, the front line is long and the span is large. The project includes water diversion hub, main canal, East I and East II main canals, electric irrigation branch canals, Heiwu branch canals, 69 branch canals and field supporting projects below the bucket canals. The length of main branch canal is1.265km, in which the total length of main canal, main canal and pumping main canal is 205.7km, and there are many buildings, mainly tunnels. There are 760 tunnels above the main canal. There are also 38 aqueducts and 3 inverted siphons. The total amount of the main project is 27.4 million cubic meters. The main canal draws water from the head of Tang Tian Temple in Tianzhu County, with a total length of 87 kilometers, including 33 tunnels, with a total length of 75.48+04 kilometers. After the main canal reaches Xianglushan, a master gate is set, and the water will flow to Dongyi and Dong Er main canals, and then flow into the irrigation area through 45 main canals. The total length of Dongyi main canal is 49.5km, and the designed diversion flow is14m3/s; The total length of Dong 'er main canal is 54.3 kilometers, the designed diversion flow is 18 m3/s, and the flow is increased by 21.5m3/s. The planned irrigation area of the project is 860,000 mu. The irrigation area plans to resettle 80,000 immigrants from arid areas. The designed water diversion flow is 32 m3/s, the water diversion flow is increased by 36 m3/s, and the annual water diversion volume is 443m3, with an estimated total investment of 28130,000 yuan.

The project started on 1976 and was postponed on 198 1 year. 1987 applied for a loan of $654.38+23 million from the World Bank, and the construction was fully resumed in the same year. 1994, main canal is connected with water; 1993, 1995, and the No.1 and No.2 main canals in Dongyi were successively flooded; 1998 and 2000, the Heiwu branch canal and the electric irrigation branch canal of Donger main canal were respectively connected with water. Up to now, the main project has been fully completed, with 62 branch canals and 780 kilometers of branch canals. The irrigation area is 734,700 mu, and 56,442 people are resettled.

Since the operation of the project, the basic conditions of agricultural production in the irrigation area have been fundamentally improved, the pace of comprehensive development and new rural construction has been accelerated, the infrastructure has been continuously improved, the project construction has made breakthrough progress, and the people's living standards have been gradually improved, laying a solid foundation for the all-round economic and social development of Lanzhou City and Baiyin City.

The water diversion project from Qin Dynasty is the largest self-flowing irrigation project across two major river basins in China. It is a miracle at all times and at home and abroad, and is called "the underground canal of China". Chinese and foreign contractors fought side by side and created many miracles in the construction of water conservancy projects that led big cities into Qin, some of which were the best in China and even in the world.

The water diversion project in Qin has become a new tourist hotspot in the west. The visit project mainly consists of Tang Tian Temple Canal Head Hub, Xianmingxia Bridge Inverted Siphon, Shuimogou Inverted Siphon, 30A Tunnel, Dashagou Aqueduct, Pandaoling Tunnel, Xianglushan Main Gate and Zhuanglanghe Aqueduct. Strolling through the northwest land, you will feel the great achievements of our people in transforming the environment and creating nature, and you will personally experience the great boldness and heroism of the northwest people.