According to an experiment conducted by the National Institute of Disaster and Safety by reproducing road conditions at Gangnam Station in Seoul in the past, it took only 41 seconds for a 40kg manhole lid to rise 26cm above the heavy rain of 50mm per hour. However, at the time of the accident in Seocho-dong, more than 120mm of heavy rain fell per hour. You can guess that all the manholes on the road have turned into "mining fields."코인사다리
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