平原地区由于地势平坦，排水管道往往无地形高差可以利用，造成下游管道埋深过大。

As the terrain in plain region is flat, the topographical height difference for the drainage pipeline cannot be utilized so as to cause the pipelines in the lower reaches are buried too deeply.

youdao

平原地区由于地势平坦，排水管道往往无地形高差可以利用，造成下游管道埋深过大。

As the terrain in plain region is flat, the topographical height difference for the drainage pipeline cannot be utilized so as to cause the pipelines in the lower reaches are buried too deeply.

youdao