Sitting in the eastern part of Guanzhong Plain in Shaanxi Province, Luohui Canal is the largest water project with the biggest irrigated area in the upper reach of Luo River, a tributary of the Yellow River. As one of the oldest underground canal diversion project in China, Longshou Canal, the predecessor of Luohui Canal, was built during the Western Han Dynasty（206B.C.-24A.D.）to divert water from the Luo River. It is famous for its innovation of the Well and Canal Method, and is a significant project in the history of water development and science and technology in China. Mr. Li Yizhi, a famous water expert, built the Luohui Canal based on the Longshou Canal by reintegrating various irrigation methods. The construction started in 1934 and ended in 1950.
Luohui Canal is composed of East Luo and West Luo irrigation systems, including a dam, an irrigation and drainage system, supporting facilities, among others. The total length of the main canal, 4 trunk canals and 13 sub-canals is 248 kilometers. Luohui Canal irrigates 4,953 km2 of farmland in Chengcheng, Pucheng and Dali counties of Weinan City in Shaanxi Province, benefiting a population of 690,000. Moreover, it has cumulatively improved saline and alkaline land of 153 km2, diverted 11.4 billion m3 of water and thus reduced 200 million tons of sediments into the Yellow River. At present, Luohui Canal is a large-scale irrigation district with a complete irrigation and drainage system, achieving significant ecological, economic and social benefits. Luohui Canal plays a crucial role in the allocation of local water resources, and has become the lifeblood of local economic and social development.
Focusing on better water management, Luohui Canal is developing into a modern irrigation district that benefits agriculture, industry, ecology and other aspects. While demonstrating water culture of the Yellow River, it has turned into a thousand-mile treasure land that yields rice and grain in abundance.