They’re being left high and dry.

A construction project meant to protect Battery Park City from the next Superstorm Sandy could wash away business for a group of charter boat captains who call the ritzy Manhattan waterfront docks their home.

North Cove Marina, the Big Apple’s most expensive harbor, will shut down this fall for the next five years as crews build a massive seawall along the coast — leaving nautical business owners floundering to find a new spot in the city’s dwindling marina spaces.

“We’ve been able to weather all the storms so far. This one is one that we obviously can’t,” said James Brooks, captain of the Ventura, a 104-year-old sailing vessel. 5

The Ventura has been at North Cove since the 1980s — and was part of an heroic brigade that evacuated 9/11 survivors

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