河北省平原地区主要排洪河道有40多条,河道总长3100多公里,防洪堤防5200多公里,由于大部分河道属于冲积性多沙游荡河道,河床高、纵坡陡、流速大、河宽变化大、主流摆动不定,低水时冲刷严重,中泓变化无常,因而形成险工险段颇多。为进一步改 There are more than 40 flood discharge channels in the plains of Hebei Province. The total length of the river channels is more than 3,100 km and the flood control embankments are over 5,200 km. Since most of the river courses are alluvial and sandy lava, the riverbed is high, the steep slope is steep, the flow velocity is large, Large, volatile mainstream, scour low water, Zhonghong changes impermanence, resulting in a lot of insurance risk section. For further change