排水坑 meaning in Chinese

disposal pit
drain pit
drain plug
drain sump
tumble bay
unwatering sump

Experimental study on the utilization technology of drainage pit mine water of haizhou open pit
海州矿排水坑矿井水资源化利用技术
Precast unreinforced and reinforced concrete components for well shafts and soakaways ; dimensions and technical delivery conditions
通风井和排水坑用预制混凝土和钢筋混凝土部件.第2部
Fire water drain pit is provided at side of bottom of each fire elevator well , waste water will be sucked up and drained out by the pumps
在每个消防电梯井底旁设有消防排水坑,废水经潜污泵提升排至室外