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Coastal Wetlands and Flood Damage Reduction: Can Insurance Save Wetlands?

By 3p Contributor

By Michael W. Beck and Jean-Bernard Crozet

An estimated 840 million people around the world live with the risk of coastal flooding. With our changing climate, the danger posed by hurricanes, floods and storms is increasing. These events have a huge economic impact, too. In 2016 alone, insurers paid out $50 billion for natural disasters; there was a further $125 billion in uninsured losses, and many of these losses were from coastal storms.

At the same time, wetlands -- which represent our first line of defense from coastal storms and flooding -- are being lost at alarming rates.

It’s no surprise that the theme for this year’s World Wetlands Day is Disaster Risk Reduction given the role these habitats play in risk reduction, but it has been difficult to put a number on this value. Fortunately, new research that quantifies the protection offered by wetlands may help garner support to protect them.

In 2012, Hurricane Sandy ravaged the northeast United States, causing more than $50 billion in damage and severely affecting economic activity. The second costliest storm in U.S. history left us with important lessons: our vulnerability to destructive storms is increasing, and recovery from disasters can be slow. However, we also learned some important lessons about how nature can offer solutions to reduce our coastal risk.

An unlikely group of conservationists, engineers and insurance risk experts joined forces to study the impact of Sandy and other storms on property damages in work supported by the Lloyd’s Tercentenary Research Foundation. The results show that natural storm defenses such as coastal wetlands help reduce waves and storm surge, protecting people and property. Using flood models advanced by the insurance industry, the study shows that wetlands likely saved more than $625 million in flood damages across 12 states during Sandy. In New Jersey, wetlands prevented an estimated $425 million in private property damages.

To be clear, wetlands don’t just matter for catastrophic events — they matter every year. In Ocean County, New Jersey, wetlands reduced annual expected losses by 20 percent on average and over 50 percent for properties built just a few feet above sea level.

These results were surprising, because in many places along the Northeast coast, only thin bands of coastal wetlands remain of the formerly extensive natural storm barriers. Where wetlands do remain, the average damage reduction during Sandy was greater than 10 percent.

That’s another important lesson: Restoring and protecting wetlands will potentially save taxpayers hundreds of millions of dollars. Investing in healthy wetlands is a highly cost-effective solution for protecting against coastal risks. Healthy wetlands also provide many other benefits, including fishery production and recreation, and they are some of the most effective natural solutions for reducing greenhouse gases and climate change.

Around the world, many properties are built on previously existing wetlands. These properties are doubly increasing our risk—by building in the highest risk areas, and by destroying our first line of coastal defenses. Yet thus far, the insurance industry has not played a large role in examining the role of natural defenses in reducing risks, and in pricing coastal wetlands effectively. We think that can change.

If the protection benefits of natural defenses were better reflected in insurance models and in insurance industry practices, that could translate into lower premiums and monetary savings for communities that conserve their natural assets — a powerful incentive for protecting wetlands. Investing in nature is good insurance for all.

We have made remarkable strides in wetland restoration. We now have robust tools that help assess where wetland restoration may be most effective in risk reduction. Through the collective efforts of many across conservation, insurance and academia we can work to build coastal resilience in the face of climate change, coastal development and other challenges.

This World Wetlands Day, let’s champion the protective role of wetlands and advocate for increased investment in our natural defenses.


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.  The project was supported by the Lloyd’s Tercentenary Research Foundation.

Dr. Michael W. Beck is Lead Marine Scientist for The Nature Conservancy and an Adjunct Professor at the University of California Santa Cruz.

Jean-Bernard Crozet is Head of Underwriting Modelling at MS Amlin and a Trustee of Lloyd’s Tercentenary Research Foundation.

Image © Erika Nortemann/TNC

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