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When the flood comes,traditional manhole covers are hide in the water,it may become the reason to many accidents.The floating cover is automatically inflated when covered by flood and float up on the water.It can greatly
enhence the flood drainage capacity and also,the color can alarm the pedestrians that it is dangerous down there.
Zhang Litao, Ying Fangtian,Zhao Xiaoliang,Gui Xiaorui Zhou Na