Rosy sunset reflected in marsh water with grasses.
Natural coastal habitats provide protection from storm surges. © Kent Mason


Coastal Wetlands Save Hundreds of Millions of Dollars in Flood Damages During U.S. Hurricanes

As communities recover from Hurricane Matthew, a new study finds more than $600 million in property losses were prevented during Hurricane Sandy by coastal habitats in the Northeast Coast.

Santa Cruz and London

As communities across the Southeast U.S. and the Caribbean count the cost of flood damage during Hurricane Matthew, a pioneering study, Coastal Wetlands and Flood Damage Reduction, has quantified how much protection natural coastal habitats provide during hurricanes.   Using the latest modeling techniques scientists from the conservation, engineering and insurance sectors studied the impact of Hurricane Sandy in the Northeast U.S. in 2012, when New York and New Jersey were badly hit by storm surges. The study found more than US$625 million in property damages were prevented during this natural catastrophe by coastal wetlands along the Northeast coast. Without them the damage bill would be much higher for Sandy and other predicted hurricanes. Where wetlands remain, the average damage reduction from Sandy was greater than 10%. Experts within the study team expect that the analyses of the effects of Hurricane Matthew earlier this month will demonstrate similar protections.  

In Maryland, wetlands reduced property damages by nearly 30%, and in New Jersey, wetlands prevented US$425 million in property damages. In Ocean County, NJ, the conservation of salt marshes is predicted to reduce average annual coastal property losses by more than 20%.  (Additional findings available online here).  Wetlands are critical not just for catastrophic hurricanes, but also for all the likely storms in the region.      

“It was unexpected to find just how effective wetlands can be at reducing property damages from catastrophic storms and hurricanes.  It was also critical that we were able to combine state-of-art engineering models with coastal ecology and economic analysis” said Siddharth Narayan, University of California Santa Cruz (UCSC) Research Fellow, and lead author of the study. “Our coastal habitats are natural defenses, and in this study, we show that their risk reduction services add up to hundreds of millions of dollars along the U.S. East Coast.”   

“Modelling has traditionally focused on man-made coastal defense structures, or on other grey architecture solutions, like elevating properties above sea level,” said Paul Wilson, VP of Model Development at RMS and expert in hurricane and storm surge.  “This study is pioneering because it applies cutting-edge modelling science to natural defenses, and it allows us to put a financial value on the role wetlands play in protecting our coastal communities against storm surges.”   

By quantifying the economic value of natural defenses they can be more effectively included in risk models and coastal management.  In fact, the protection they provide is often incorporated in industry risk models, but these benefits are often pooled with many other factors and then not clearly recognized by model users, (re)insurers, brokers, clients and others. Wetlands can be straightforwardly included in results provided by the risk and engineering sectors and thus more easily considered in coastal development and habitat restoration decisions.  There were also additional critical findings for coastal policy makers. For example, some townships with few wetlands within their borders benefit greatly from wetland preservation in neighboring townships; the value of wetland to properties accumulate as you move upstream away from the coast.   

The magnitude of the benefits was surprising given how many coastal wetlands already have been lost throughout the region.  For example, wetlands did not reduce as much damage in New York in part because of their extensive loss in past decades. At the same time, even relatively small, thin bands of wetlands serve as an effective first line of defense, and they can be restored to build coastal resilience.   

“This work shows the unlikely yet powerful benefits of collaboration between insurers, engineers and conservationists in identifying solutions to reduce risks to people, property and nature,” said Michael Beck, The Nature Conservancy’s Lead Marine Scientist, UCSC Adjunct Professor, and LTRF Project Lead. “The work highlights where we can find innovative financing opportunities and incentives for conserving and restoring coastal wetlands, which plainly put is good for the environment and good for business.”  

“Lloyd’s Tercentenary Research Foundation aims to fund cutting-edge scientific research that contributes positively to society; this principle is embodied in the ongoing project led by the University of California at Santa Cruz,” said Jean-Bernard Crozet, Trustee of Lloyd’s Tercentenary Research Foundation and Head of Underwriting Modelling at MS Amlin.  Coastal ecosystems such as coral reefs, mangroves, and salt marshes play a fundamental role in reducing the risk of storm surge. The LTRF believes that improved quantification of these benefits will, in turn, lead to better management and conservation of these natural ecosystems, contributing not only to risk reduction along our coasts but to our planet’s sustainability in the long run.”    The study was led by the University of California, Santa Cruz; The Nature Conservancy and the Wildlife Conservation Society in association with Risk Management Solutions and Guy Carpenter & Company, LLC.  The Project was supported by the Lloyd’s Tercentenary Research Foundation with additional support from the Science for Nature and People Partnership (SNAPP).   


About UC Santa Cruz
The University of California, Santa Cruz, has earned a national reputation for challenging the status quo through its research, teaching, and public service, which are routinely cast through a lens of environmental stewardship and social justice. Learn more about UCSC and about the new initiative and graduate program in Coastal Sustainability at Contact for the press:  Tim Stephens: +1-831-4594352,

About the Wildlife Conservation Society
WCS saves wildlife and wild places worldwide through science, conservation action, education, and inspiring people to value nature. VISION: WCS envisions a world where wildlife thrives in healthy lands and seas, valued by societies that embrace and benefit from the diversity and integrity of life on earth. To achieve our mission, WCS, based at the Bronx Zoo, harnesses the power of its Global Conservation Program in more than 60 nations and in all the world’s oceans and its five wildlife parks in New York City, visited by 4 million people annually. WCS combines its expertise in the field, zoos, and aquarium to achieve its conservation mission.  Contact for the press:  Mary A. Dixon:  +1-718-2203711 or +1-347-8401242 (M),

About Lloyd’s Tercentenary Research Foundation
Lloyd's Tercentenary Research Foundation was established to mark the tercentenary of Lloyd’s in 1988. Since then, it has funded over 100 years of academic research in the fields of engineering, science, medicine, business and the environment through the provision of post-doctoral fellowships and business scholarships.  Today, through its partnership with the Insurance Intellectual Capital Initiative, UK Research Councils and specifically commissioned academic institutions, Lloyd's Tercentenary Research Foundation continues its work of funding top flight academic research by supporting new programs of research on risk related issues.  Learn more at  Contact for the press:  Stewart Todd:  +44 (0)20 7327 6745 ext. 6272,

Guy Carpenter & Company, LLC
Guy Carpenter & Company, LLC is a leading global risk and reinsurance specialist. Since 1922, the company has delivered integrated reinsurance and capital market solutions to clients across the globe. As a most trusted and valuable reinsurance broker and strategic adviser, Guy Carpenter leverages its intellectual capital to anticipate and solve for a range of business challenges and opportunities on behalf of its clients. With over 2,300 professionals in more than 60 offices around the world, Guy Carpenter delivers a powerful combination of broking expertise, strategic advisory services and industry-leading analytics to help clients achieve profitable growth. Contact for the press:  Jennifer Ainslie:  +44 (0)207 357 2164 or +44 (0)7974 190032 (M),

About RMS
RMS models and software help financial institutions and public agencies evaluate and manage catastrophe risks throughout the world, promoting resilient societies and a sustainable global economy. Learn more at and follow us @RMS.  Contact for the press: +44 7780 225 625,

About the Science for Nature and People Partnership (SNAPP):
Launched in 2013, as a partnership between The Nature Conservancy, the Wildlife Conservation Society, and the National Center for Ecological Analysis and Synthesis (NCEAS) at University of California, Santa Barbara, SNAPP is a first-of-its-kind collaboration that delivers evidence-based, scalable solutions to global challenges at the intersection of nature conservation, sustainable development, and human well-being. Learn more at:


The Nature Conservancy is a global conservation organization dedicated to conserving the lands and waters on which all life depends. Guided by science, we create innovative, on-the-ground solutions to our world's toughest challenges so that nature and people can thrive together. We are tackling climate change, conserving lands, waters and oceans at an unprecedented scale, providing food and water sustainably and helping make cities more sustainable. Working in 79 countries and territories, we use a collaborative approach that engages local communities, governments, the private sector, and other partners. To learn more, visit or follow @nature_press on Twitter.