Helical-corrugated pipe can deliver more sediment with a given power input than either standard corrugated or plain pipe . 螺旋皱纹管与标准皱纹管或平整面的管道相比较,可以输送更多的泥沙。
2.
The formation level for the cwb tunnel including its foundation is about - 30mpd 包括地基在内,中环湾仔绕道隧道的平整面水平约在主水平基准面以下30米