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1 项目背景 密云县位于北京东北部，距北京75 km，全县总面积2226．5 km2，其中山地1857．1 km2，占全县总面积的83．4％。县内有华北地区最大的密云水库，还有3座中型水库，20座小型水库及2443眼机井。有白河、潮河、清水河等10条主要河流。 密云县水资源虽较丰富，但
1 Project Background Miyun County is located in the northeast of Beijing, 75 km away from Beijing. The total area of the county is 2226.5 km2, of which 1857.1 km2 is in the mountainous region, accounting for 83.4% of the total area of the county. The county has the largest Miyun Reservoir in North China, there are three medium-sized reservoirs, 20 small reservoirs and 2443 eye machine wells. White River, Chao River, Qingshui River and other 10 major rivers. Although there are abundant water resources in Miyun County,