Area of Shidankou Reservoir in Lu Xian County

Guankou Reservoir covers an area of 47,000 square kilometers. The main tributaries are Yanghe River, Sanggan River and Guishui River, and the Yongding River basin covers an area of about 43,400 square kilometers, accounting for 92.3% of the total basin area.

Guanting Reservoir is the oldest large reservoir on Yongding River in Haihe River system, and the first large reservoir established after the founding of New China. The five districts of Xiahuayuan and six counties of Huailai, Yuxian, Yangyuan, Zhuolu, Huai 'an and Wanquan also include Yanqing District of Beijing. The main body of the reservoir area spans Huailai County, Zhangjiakou City, Hebei Province and Yanqing District, Beijing, with a very special geographical position. [8] Guanting Reservoir covers an area of 47,000 square kilometers. The main tributaries are Yanghe River, Sanggan River and Guishui River, and Yongding River covers an area of about 43,400 square kilometers, accounting for 92.3% of the total basin area. Guanting Reservoir started in June19510, and was completed in May1954; The main current is Yongding River in Huailai, Hebei Province. For more than 40 years, this reservoir has played a great role in flood control, irrigation and power generation. Guanting Reservoir was once one of the main water supply sources in Beijing.

Guanting Reservoir, with an area of 163 square kilometers, spans Huailai County, Zhangjiakou City, Hebei Province and Yanqing District, Beijing. Guanting Reservoir, completed at 1954, is the first large-scale reservoir built after the founding of New China, serving as the drinking water source in Beijing. 65438-0997, Guanting Reservoir withdrew from the list of drinking water sources in Beijing due to serious pollution. After treatment, the water quality has been improved, and the function of Beijing's standby drinking water source was restored in 2007.