疏水孔 meaning in English

drain hole
drainage hole

The oozing out of a large quantity of muddy water from the base or the weep holes of a slope indicates that the slope is saturated with water
斜坡底部或疏水孔有大量泥水透出时，显示斜坡内的水份已饱和，斜坡之中段或顶部有裂
To facilitate drainage of groundwater and to maintain water flow , permeable rocks will be used for recompaction . filter layer and weepholes will also be installed . these will guarantee the normal flow of groundwater
为促进排水及保持正常水流，工程将使用具渗透性的石块作重新压实，同时安装过滤层及疏水孔，以确保地下水仍可如常流出。