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floodwalls

New York is raising its shoreline

January 18, 2024 By EarthWise Leave a Comment

Superstorm Sandy in 2012 flooded 17% of New York City and caused $19 billion in damage.  In its aftermath, plans emerged to create floodwalls, raised elevations, high-capacity drainage, and other infrastructure to protect the city from future Sandy-like events.

Like all large infrastructure projects in densely populated places, the remaking of New York’s shoreline has only moved along in fits and starts.  But there has been significant progress.

The East Side Coastal Resiliency (ESCR) project is the largest urban resiliency project currently underway in the United States.  The first piece of it – the Asser Levy renovation – was completed in 2022.  Over the next three years, the $1.8 billion ESCR will reshape two-and-a-half miles of Lower Manhattan’s shoreline.  The ESCR is just one part of a much larger $2.7 billion initiative called the BIG U, which is a series of contiguous flood resilience projects that will create 5.5 miles of new park space specifically designed to protect over 60,000 residents and billions of dollars in real estate against sea level rise and storm surges. 

In a time of rising seas and increasingly powerful storms, flood-prone coastal U.S. cities – including Boston, Norfolk, Charleston, Miami, and San Francisco – are moving toward embracing the long-held Dutch concept of “living with water”, which emphasizes infrastructure that can both repel and absorb water while also providing recreational and open space.

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After a Decade of Planning, New York City Is Raising Its Shoreline

Photo, posted November 1, 2012, courtesy of Rachel via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Protecting New York City From Flooding | Earth Wise

April 21, 2023 By EarthWise Leave a Comment

Hurricane Sandy flooded Lower Manhattan in October 2012, closing Wall Street, blacking out power for 250,000 people, and killing 44 New Yorkers.  Within a year, plans were in motion to build berms, floodwalls, and water gates along the city’s Lower East Side in a $770 million first phase of an overall plan to defend New York City from future floodwaters.

Plans got more and more complicated, and the price tag reached $1.45 billion before the existing plan was scrapped by former Mayor Bill de Blasio’s administration in 2018 without involving the community groups that were instrumental in creating the original plan.  After years of lawsuits and court actions, the revised East Side Coastal Resiliency Project is finally proceeding, now at a price tag approaching $3 billion. The project will include 18 moveable floodgates and will protect 110,000 New Yorkers, including 28,000 low-income public-housing residents and is expected to be completed in 2026.

The original larger overall plan was halted in 2020 after former President Trump mocked it and claimed that it would cost $200 billion.  The current plan, created by the U.S. Army Corps of Engineers and known as the 3B alternative, calls for a combination of deployable flood barriers, floodwalls, seawalls, and elevated promenades wrapping around the lower part of Manhattan.  The cost of the project is estimated to be $61 billion. 

In the meantime, over 10 years after Sandy, a similar storm would have almost the same effect today as Sandy had back then.

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New York City Begins Its Climate Change Reckoning on the Lower East Side, the Hard Way

Photo, posted January 19, 2013 courtesy of Andres Alvarado via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Should New York Build A Storm Surge Barrier?

December 6, 2019 By EarthWise Leave a Comment

In 2012, Superstorm Sandy’s storm surge combined with a high tide and buried lower Manhattan under 13 feet of water.  Across all five boroughs, subways, highways, and parking garages flooded and homes and businesses were destroyed.  Sandy caused nearly $20 billion in damages in New York City alone and more than 50 people died.

Ever since that disaster took place, there have been discussions about building storm surge barriers to protect the city from future storms.  Columbia University’s Sabin Center recently hosted an event to discuss the feasibility of building such barriers.

A study by the U.S. Army Corps of Engineers called the NY and NJ Harbor and Tributaries Focus Area Feasibility Study (HATS, for short) evaluates five options for coastal protection, which range in scope and price.

The most extensive option would involve constructing six miles of storm surge gates along with 26 miles of floodwalls, levees, and buried seawalls.  This option would cost $62 billion but could theoretically save $131 billion in damages and protect 95% of the study area.

The study also considers the side effects of building storm surge barriers.  These include environmental impacts such as effects on fish and wildlife, water quality, noise and vibrations, and changes in water flow.  While these effects can be quite serious and there is opposition from many quarters related to environmental impacts, others point out that there is really no other credible defense against storm surge.  The debate over whether or not to build storm surge barriers could easily last for many more years.

In the bigger picture, storm surge barriers do nothing to protect against rain-driven flooding, sea level rise, and tidal floods which continue to increase.

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Should New York Build a Storm Surge Barrier?

Photo, posted October 30, 2012, courtesy of Pamela Andrade via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

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