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一、卫运河概况漳卫南运河为海河流域的五大水系之一,上游有漳、卫两河,于徐万仓汇流后至四女寺间的一段,始称卫运河,全长157公里, 流域面积37200平方公里,其中山区面积占90%,保证行洪流量4000m~3/s,平滩流量(造床流量)为1150m~3/s。流域内降雨年内分布极不均匀,汛期7～9三个月降雨量为全年的70%,雨量集中,易形成陡峭的洪峰。
I. Overview of Wei Canal Zhangwei Canal is one of the five major river systems in the Haihe River Basin. There are Zhanghe River and Weihe River in the upper reaches. After the passage of Xu Wengang to a section between the four temples, the Wei Canal began to be called Wei Canal. The total length of the canal is 157 km. 37200 square kilometers, of which 90% of the mountain area, to ensure that the line flood 4000m ~ 3 / s, flat beach flow (making flow) 1150m ~ 3 / s. Within the drainage area, the distribution of rainfall is extremely uneven. During the flood season, the rainfall in the three months of July to September is 70% of the whole year. The rainfall is concentrated and the steep flood peak is easy to form.