东平水道的上段,从三水河口到紫洞口约23.5km河段,是北江在珠江三角洲的主干部分,也是航道整治工程的重点河段。该工程于1990年竣工以来,经过8年检验,除航道尺度满足三级标准并正在朝着二级标准发展外,其河道的行洪断面随着航道尺度提高而大为增加,从而扩大了行洪能力,使同样洪水位时洪流量增加,或者在同样流量时水位下降,对于治理珠江下游的洪患有显著 The upper section of the Dongping waterway is about 23.5km from the Sanshui River estuary to the purple cave and is the backbone of the Beijiang River in the Pearl River Delta. It is also the key river course of waterway regulation works. Since its completion in 1990, the project has been tested for 8 years. Except that the scale of waterway meets Grade 3 standard and is developing toward Grade 2 standard, the flood discharge section of the river channel increases greatly as the scale of the waterway increases. As a result, Flooding capacity to increase flood flow at the same flood level or to reduce water level at the same flow rate is significant for flood control in the lower reaches of the Pearl River