<figure>
                        <iframe width="560" height="315" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen src="https://www.youtube.com/embed/h6Fvx6Cw4tE"></iframe>
                        <figcaption>Drone footage shows homes close to collapsing into the ocean. WPLG/YouTube</figcaption>
                    </figure><p><b>By ZHONG-REN PENG</b><br><a href="https://theconversation.com/dreaming-of-beachfront-real-estate-much-of-floridas-coast-is-at-risk-of-storm-erosion-that-can-cause-homes-to-collapse-as-daytona-just-saw-194492"><i>The Conversation</i></a></p><p>Back-to-back hurricanes left an unnerving scene on the Florida coast 
in November 2022: Several houses, and even swimming pools, were left 
dangling over the ocean as waves eroded the land beneath them. <a href="https://www.facebook.com/VolusiaCountyEmergencyManagement/posts/pfbid02EZ9SbTjdQhrkGtFm452UhzhzjprPu6h6WaQbPLuMLsRNpCLAuPoPKTZDUvjygUb7l">Dozens of homes and condo buildings</a> in the Daytona Beach area were deemed unsafe.  </p><p>The destruction has raised a disturbing question: How much property 
along the rest of the Florida coast is at risk of collapse, and can it 
be saved?</p><p>As the director of <a href="https://dcp.ufl.edu/iadapt/">iAdapt</a>, the International Center for Adaptation Planning and Design at the University of Florida, <a href="https://scholar.google.com/citations?user=ngiXpvgAAAAJ&amp;hl=en">I have been</a> studying climate adaptation issues for the last two decades to help answer these questions.</p><h2>Rising seas, aging buildings</h2><p>Living by the sea has a strong appeal in Florida – beautiful beaches,
 ocean views, and often pleasant breezes. However, there are also risks,
 and they are exacerbated by climate change.</p><p>Sea level is forecast to rise on average <a href="https://oceanservice.noaa.gov/hazards/sealevelrise/sealevelrise-tech-report.html">10 to 14 inches</a> (25-35 cm) on the U.S. East Coast over the next 30 years, and 14 to 18 inches (35-45 cm) on the Gulf Coast, <a href="https://theconversation.com/ipcc-climate-report-profound-changes-are-underway-in-earths-oceans-and-ice-a-lead-author-explains-what-the-warnings-mean-165588">as the planet warms</a>. Rising temperatures are also <a href="https://climate.nasa.gov/news/3184/a-force-of-nature-hurricanes-in-a-changing-climate/">increasing the intensity</a> of hurricanes.</p><p>With higher seas and larger storm surges, ocean waves more easily 
erode beaches, weaken sea walls, and submerge cement foundations in 
corrosive salt water. Together with <a href="https://geodata.dep.state.fl.us/datasets/194ac159bd1e4be294b14dd882d42dcf_0/about">subsidence</a>, or sinking land, they make coastal living riskier.</p><figure>
                        <img src="https://media.eaglewebservices.com/public/2022/11/1669240214504.png" alt=" Florida’s erosion risk map shows most of the state’s coastline at critical risk. Florida Department of Environmental Protection, CC BY-SA " />
                        <figcaption> Florida’s erosion risk map shows most of the state’s coastline at critical risk. Florida Department of Environmental Protection, CC BY-SA </figcaption>
                    </figure><p>The risk of erosion varies depending on the soil, geology and natural
 shoreline changes. But it is widespread in U.S. coastal areas, <a href="https://geodata.dep.state.fl.us/datasets/FDEP::coastal-critical-erosion-areas/about">particularly Florida</a>. Maps produced by engineers at the <a href="https://geodata.dep.state.fl.us/datasets/FDEP::coastal-critical-erosion-areas/about">Florida Department of Environmental Protection</a> show most of Florida’s coast faces critical erosion risk.</p><p>Aging or poorly maintained buildings and sea walls, and older or poor construction methods and materials, can dramatically <a href="https://www.nationalgeographic.com/environment/article/sinking-land-rising-seas-dual-crises-facing-coastal-communities">aggravate the risk</a>.</p><h2>Designing better building codes</h2><p>So, what can be done to minimize the damage?</p><p>The first step is to build sturdier buildings and fortify existing ones according to advanced building codes.</p><p>Building codes change over time as risks rise and construction 
techniques and materials improve. For example, design criteria in the <a href="https://codes.iccsafe.org/content/FLBC2020P1">Florida Building Code</a>
 for South Florida changed from requiring some new buildings to be able 
to withstand 146 mph sustained winds in 2002 to 195 mph winds in 2021, 
meaning a powerful Category 5 hurricane.</p><p>The town of <a href="https://www.washingtonpost.com/climate-solutions/2022/10/01/punta-gorda-hurricane-ian-damage/">Punta Gorda</a>,
 near where Hurricane Ian made landfall in October 2022, showed how 
homes constructed to the latest building codes have a much better chance
 of survival.</p><p>Many of Punta Gorda’s buildings had been rebuilt after Hurricane 
Charley in 2004, shortly after the state updated the Florida Building 
Code. When Ian hit, they survived with less damage than those in 
neighboring towns. The updated code required new construction to be able
 to withstand hurricane-force winds, including having shutters or 
impact-resistant window glass.</p><p>However, even homes built to the latest codes can be vulnerable, 
because the codes don’t adequately address the environment that 
buildings sit on. A modern building in a low-lying coastal area could 
face damage in the future as sea level rises and the shoreline erodes, 
even if it meets the current flood zone elevation standards.</p><p>This is the problem coastal residents faced during Hurricanes Nicole <a href="https://www.latimes.com/world-nation/story/2022-10-06/apocalypse-in-paradise-after-hurricane-ian-a-low-lying-florida-city-contends-with-rising-water">and Ian</a>. Flooding and erosion, exacerbated by sea-level rise, caused the most damage – not wind. </p><p>The dozens of beach houses and condo buildings that <a href="https://www.usnews.com/news/us/articles/2022-11-14/florida-county-puts-damage-from-nicole-at-481-million">became unstable or collapsed</a>
 in Volusia County during Hurricane Nicole might have seemed fine 
originally. But as the climate changes, the coastal environment changes,
 too, and one hurricane could render the building vulnerable. Hurricane 
Ian damaged sea walls in Volusia County, and some <a href="https://www.news-journalonline.com/story/news/2022/11/10/tropical-storm-nicoles-fury-washes-away-homes-wilbur-sea/8323351001/">couldn’t be repaired before Nicole</a> struck. </p><h2>How to minimize the risk</h2><p>The damage in the Daytona area in 2022 and the <a href="https://miamisao.com/wp-content/uploads/2021/12/GRAND-JURY_202112151434-1.pdf">deadly collapse</a> a year earlier of a condo tower in Surfside should be a wake-up call for all coastal communities.</p><p><a href="https://coast.noaa.gov/digitalcoast/topics/vulnerability-assessments.html">Data and tools</a> can show where coastal areas are most vulnerable. What is lacking are policies and enforcement.</p><p>Florida recently began requiring that state-financed constructors conduct <a href="https://floridadep.gov/rcp/florida-resilient-coastlines-program/content/resilience-and-coastal-protection-rules-development">a sea-level impact study</a>
 before starting construction of a coastal structure. I believe it’s 
time to apply this new rule to any new construction, regardless of the 
funding source.</p><p>A comprehensive sea-level impact study requirement should also allow 
for risk-based enforcement, including barring construction in high-risk 
areas.</p><p>Similarly, vulnerability audits – particularly for multistory 
buildings built before 2002 – can check the integrity of an existing 
structure and help spot new environmental risks from sea-level rise and 
beach erosion. Before 2002, the building standard was low and 
enforcement was lacking, so many of the materials and the structures 
used in those buildings aren’t up to the standards of today. </p><h2>What property owners can do</h2><p>There is a range of <a href="https://www.fema.gov/sites/default/files/documents/fema_protect-your-home-from-flooding-brochure_2020.pdf">techniques</a> homeowners can use to fortify homes from flood risks.</p><p>In some places, that may mean <a href="https://cpo.noaa.gov/News/ArtMID/7875/ArticleID/2059/Elevating-Houses-Can-Protect-Against-Damaging-Floods-But-How-High-is-High-Enough">elevating the house</a>
 or improving the lot grading so surface water runs away from the 
building. Installing a sump pump and remodeling with storm-resistant 
building materials can help.</p><p><a href="https://www.fema.gov/sites/default/files/documents/fema_protect-your-home-from-flooding-brochure_2020.pdf">FEMA</a>
 suggests other measures to protect against coastal erosion, such as 
replenishing beach sand, strengthening sea walls and anchoring the home.
 Engineering can help communities, temporarily at least, through sea 
walls, ponds and increased drainage. But in the long term, communities 
will have to assess the vulnerability of coastal areas. Sometimes the 
answer is <a href="https://theconversation.com/managed-retreat-done-right-can-reinvent-cities-so-theyre-better-for-everyone-and-avoid-harm-from-flooding-heat-and-fires-163052">to relocate</a>.</p><p>However, there’s a disturbing trend after hurricanes, and we’re 
seeing it with Ian: Many damaged areas see lots of money pouring in to 
rebuild in the same vulnerable locations. An important question 
communities should be asking is, if these are already in high-risk 
areas, why rebuild in the same place?</p><p><i>Zhong-Ren Peng is a Professor of Urban and Regional Planning at the&nbsp; University of Florida.</i></p><div><iframe src="https://counter.theconversation.com/content/194492/count.gif?distributor=republish-lightbox-advanced" width="1" height="1" style="border: none !important" referrerpolicy="no-referrer-when-downgrade"></iframe></div>

🎥 Beachfront real estate? It just might crumble into the ocean