Watersupply and drainage engineering is sorted out engineering discipline, and it is a field of intercross multi-discipline.

摘要给水排水工为工类，是多互相交叉形成一。

Water supply corporations is feazed by redwater even blackwater, users rebel for that, they even have suspicious with the watersupply corporations.

红水、黑水现象经常困扰各城水企业，对此用户十分反感，甚至对自来水信誉产生了质疑。