AS the outlet pipe of well F1 is exposed,it has completed rotten,and lost the drainage function,so we have to rebuilt the downstream offtake.

• 留学解答资讯网:由于人井F1的出水管暴露在人井外，且已锈蚀腐烂，完全失去了排水功能。故F1下游排水渠需重新铺设。