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The gates would allow shipping to pass through. Other proposals would involve shoreline barriers along sections of Manhattan, Queens and the New Jersey shoreline, but that design would leave the mouth of the Hudson unobstructed.

Can New York City Survive the Sea?

The state Department of Environmental Conservation and the New Jersey Department of Environmental Protection have been working with the Corps on the planning since mid While any decision is likely years away, the two largest barrier concepts were called a threat "to the very life of the Hudson River" by an official with the conservation group Riverkeeper, a Westchester County not-for-profit that advocates for the river's quality and ecology.

The impacts of such barriers on the Hudson "would be felt in every community from the Atlantic up to Troy. The Hudson is a tidal estuary, and tides run from the ocean and up the river more than miles to the Troy dam. Lipscomb said restricting tidal flows between the Atlantic and the river could harm aquatic life that relies on that cyclical exchange, including herring, shad, striped bass, sturgeon and eels.

He said the ongoing sea level rise and power powerful storm surges would likely require the barriers to be kept closed more and more often, which as years went by would increasingly cut off the Hudson from the effects of tides. In a statement, the DEC said protecting coastal communities was "a top priority in New York state in the wake of Superstorm Sandy and the enormous challenge posed by climate change, including sea level rise and surge from more frequent and intense storms.

DEC is committed to exploring all options as part of a comprehensive approach to bolstering coastal resilience and ensuring our communities and the environment are protected.

5 Ideas for Protecting New York From The Next Sandy (Some Of Which Are A Little Nuts)

Find out more about potential plans to build ocean barriers outside of New York City that could restrict tidal activity in the Hudson River all the way to the Capital Region. The Corps regional office in New York City, which is coordinating the project, could not provide comment for this story. Engineers closed all the navigation and sluice gates for 12 hours.

Hurricane Sandy Storm Surge by ConEd Power Plant. New York City

Engineers have also successfully closed and opened the gates during tests in the middle of winter, when the water leaning against the structures is capped with a half a meter of ice. Graeme and Goldstick hope that the two systems will not be similar in one respect. The Saint Petersburg design sat on shelves for decades, and after an initial phase of construction the project was stalled for years before it was then revived and completed.

Can New York City Survive the Sea? | Dissent Magazine

If New York City wanted to build the Outer Harbor Gateway, the engineering studies, design and construction could all happen within eight to 10 years, Goldstick says. Critics might also object to the plan, saying the money could be better spent to flood-proof all kinds of structures in the city itself against sea level rise and smaller storms, which they contend are much more likely in the future than another superstorm surge.

To fully protect New York, a second, smaller barrier would have to be built northeast of the city, across the Long Island Sound. Halcrow has not proposed a design for that location. Mark Fischetti is a senior editor at Scientific American,.

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