US$600m in property losses prevented during Hurricane Sandy by coastal wetlands

Written by staff reporter
2016-10-25

As communities across the Southeast US and the Caribbean count the cost of flood damage during Hurricane Matthew, a study, ‘Coastal Wetlands and Flood Damage Reduction’ has quantified how much protection natural coastal habitats provide during hurricanes.

Using the latest modelling techniques scientists from the conservation, engineering and insurance sectors studied the impact of Hurricane Sandy in the Northeast US in 2012, when New York and New Jersey were badly hit by storm surges. The study found more than US$625m 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$425m 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%.

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 defences, and in this study, we show that their risk reduction services add up to hundreds of millions of dollars along the US East Coast.”

“Modelling has traditionally focused on man-made coastal defence 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 defences, 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 defences 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 recognised 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 neighbouring 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 defence, 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.


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