The surface pollution control of city water source is the key to ensuring safety of drinking water.
城市饮用水源地面源污染的控制是确保饮水安全的关键环节。
Liujiang basin is an important water source area of Qinhuangdao city. The surface collapse will happen at hidden karst areas, due to much exploiting of ground-water.
柳江盆地是秦皇岛市的重要水源地，由于大量开采地下水，在隐伏岩溶发育区将引起地表塌陷。
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