The most damaging effect of Hurricane Sandy was that of flooding.
Explanation:
Hurricane Sandy was a highly destructive hurricane that hit the eastern coasts of the United States back in 2012. It was a category 1 hurricane with a wind speed of about 185 kilometers per hour. Until 2017, before Hurricane Harvey and Maria hit the US, Hurricane Sandy was the most destructive hurricane in the history of the US. It had claimed about 117 human lives and had struck a toll of $70 billion on the local property.