大清河水系跨京津冀三省市,流域面积39154km2,有南北拒马河、白沟河、大清河、独流减河等诸多河流。自上而下有小清河分洪区、兰沟洼、白洋淀、东淀、文安洼、贾口洼、团泊洼七大蓄滞洪区,其中小清河分洪区、兰沟洼、东淀、文安洼、贾口洼五洼淀为重点蓄滞洪区(以下简称五洼淀) Daqing River across the Beijing, Tianjin and Hebei provinces and cities, the drainage area of ​​39154km2, South and North Juma, Baigou, Daqing, rivers and many other rivers. From top to bottom Xiaoqing River flood diversion area, blue ditch depression, Baiyangdian Lake, Dongdian, Wen’an depression, Jiakou depression, Mission Park seven flood retaining area, which Xiaoqinghe flood diversion area, blue ditch depression, Dongdian, Wenan Wa , Jiao Kou depression Wadu Lake focus on flood storage and detention (hereinafter referred to as Wu Wa Dian)