New Jersey and the Surging Sea
Description: A vulnerability assessment with projections for sea level rise and coastal flood risk.
Date: Oct. 29, 2012 | Updated: April 2014
Sea levels are rising at an accelerating rate, and the scientific community is confident that global warming is the most important cause. Higher sea levels translate to more and higher coastal floods. Using local sea level projections based on scenarios from a technical report for the National Climate Assessment, this analysis finds a 3-in-4 chance of historically unprecedented coastal flooding in the northern New Jersey/New York Harbor area by 2100, assuming sea level rises on the fast end of the spectrum; or a 1-in-10 chance under a slow rise scenario as might be expected under reduced carbon emissions. We find that sea level rise from warming has already increased the likelihood of extreme flooding in the area – flooding high enough to seriously threaten the PATH transit system – by 50%.
285 square miles of land lie less than 5 feet above the high tide line in New Jersey. This land is home for 295,000 residents, 23% of whom live in just 3 zip codes. $112 billion in property value sits on the same land, as do some 2,100 miles of road, 1,700 EPA-listed sites, and 45 public schools. These numbers grow by more than half when assessed at 9 feet above the high tide line – Sandy’s peak flood elevation as measured at the Battery in New York City, and most likely close to the peak flood height at Sandy Hook, NJ, as well.
In the coastal and low-lying counties of New Jersey, the most socially vulnerable populations are twice as likely than the population as a whole to be flooded at either level.
This updated report is being released as a summary of findings coincident with the upgrade of a New Jersey Surging Seas Risk Finder online tool, accessible at http://sealevel.climatecentral.org/ssrf/new-jersey.
The tool includes:
interactive local projections of sea level rise and increasing coastal flood risk from 1-10 feet by decade;
a zooming, zip-searchable map of low-lying areas threatened, plus layers showing social vulnerability and population density;
detailed assessments of populations, property, infrastructure and contamination sources exposed, for each implicated county, city, town, zip code and more; and
state- and county-wide heat maps facilitating high-level vulnerability comparisons.
Detailed knowledge of vulnerability is a critical tool for communities seeking to build resiliency to the climate challenges of today and the future.