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When it is raining heavily, the city streets may suffer flooding. In this situation, the manhole covers are always put aside to let the manhole drain as much water as possible. However this method causes a series of problems. For example, people may fall into the opening manhole when the manhole is covered by the flooding water.
MANHOLE COVER ALERT is a manhole cover with better drainage
capacity and warning function. It has a warning ring. The ring will float on the water to enhancethe drainage capacity. At the same time, the bright color alarms the coming pedestrians and vehicles. Our design prevents people from dangerous area.