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February 27, 2013. Cape May, New Jersey. A groin on the beach in Cape May. Groins, usually referred to as jetties, can reduce beach erosion in some cases, but cause the channeling of beachfront down tide from where they are built.. Tracing the path of Hurricane Sandy, which wrecked havoc on the northeastern seaboard from October 25-31, 2012. The storm caused flooding and caused an estimated 60 billion dollars worth of damage to affected areas.