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按照全国生态功能区划(2008),京津水源地水源涵养功能区包括密云水库、官厅水库、于桥水库、潘家口水库等北京市、天津市重要水源地的涵养区以及滦河、潮河上游源头。行政区涉及北京市密云、延庆、怀柔3个区,天津市蓟县,河北省承德、张家口两个市以及内蒙古自治区锡林浩特和山西省大同的部分地区,面积约两万平方公里。虽然南水北调中线工程每年可为北京提供十亿立方左右的水量,但
According to the national zoning of ecological functions (2008), the water conservation function areas of Beijing-Tianjin Water Source Area include Miyun Reservoir, Guanting Reservoir, Yuqiao Reservoir, Panjiakou Reservoir and other Beijing Municipality, important water conservation areas of Tianjin and the upper reaches of Luan River and Chao River source. The administrative regions cover three districts of Miyun, Yanqing and Huairou in Beijing, two counties in Ji County in Tianjin, Chengde and Zhangjiakou in Hebei Province, and some parts of Xilinhot in Inner Mongolia Autonomous Region and Datong in Shanxi Province, covering an area of about 20,000 square kilometers. Although the mid-route of the South-North Water Diversion Project can provide Beijing with about one billion cubic meters of water a year,