Three more ancient Chinese irrigation sites have been recognized as World Heritage Irrigation Structures (WHIS).
Granted by the International Commission on Irrigation and Drainage (ICID) on November 26, the inclusions of the Li Canal-Gaoyou Irrigation District, the Liao River Irrigation District, and the Sagya Water Storage and Irrigation System have brought the total number of Chinese irrigation projects on the WHIS list to 26.
The Sagya water storage and irrigation system in Shigatse City in southwest China's Xizang Autonomous Region has an average elevation above 4,000 meters. It is the highest of the sites on the global list.
Liu Xueying, the technical application support team leader of the Sagya Water Storage and Irrigation System, said the Water Storage and Irrigation System in Xizang Autonomous Region is conservatively estimated to have more than 400 reservoirs still in use. It has benefited more than 300,000 people, accounting for about 10 percent of the total population of the Xizang Autonomous Region. Today, the irrigation system still uses the ancient engineering structure and management methods. In addition, its technological, historical and cultural values are still driving the economic and social development of Shigatse city and Xizang.
According to Liu, the irrigation system, built at high-altitude and in a very cold region, recorded a remarkable chapter in the history of water conservancy engineering. It adapted measures to local conditions and developed the corresponding management system. Zhu Haidong, an expert in water conservancy, explained that the reservoir is exposed to sunlight, so that the temperature of the pool water collected from the melting ice water is significantly increased, thus making it possible for the highland barley to thrive in the cold environment.
The reservoirs still in use play an important role in developing Shigatse city into the "Highland Barley Area of the World." Highland barley has been the most important crop and the staple food ingredient in Xizhang for thousands of years.
Due to the unique natural climatic conditions, irrigation has become essential for developing China's agriculture.