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To prevent people from getting injured by the bare manhole in the flood, we put forward a safe hole cover equipped with ascending scallop shape guardrail to play the role of sign and roadblock. At the same time, with the rise of six guardrails, the center of cover will descend to a lower position to spare more space for water to flow out. According to the different view angles of pedestrians and drivers, there are two lighting bars on each guardrail to remind people to keep away from this dangerous area. The operation manners are designed to be both manpowered and electrical-driven, which makes FLOOVER adapt to more circumstances.