Flood risk at high tide is accelerating, endangering the coastal economy

As sea levels rise, it is easy to overlook the subtleties of higher water. It is much harder to overlook that salt water floods the streets more often, disrupting daily life and exacerbating existing problems.

The frequency of high-tide floods along the US coast has doubled since 2000 and is expected to increase five to fifteen times over the next 30 years than the US National Oceanic and Atmospheric Administration. Warning with new report Released July 14, 2021.

I work with the coastal community The northern Gulf of Mexico faces the risk of rising sea levels in an attempt to avoid preventable damage and costs, such as infrastructure disruptions, lower asset values ​​and lower returns. Information such as the NOAA report is important to support the success of these communities.

Last year, the United States experienced an average of four days of storm surge floods across the country, but the numbers alone do not give the big picture. In some areas, far more areas were seen.there were Record numbers The number of days of high tide floods in 2020 along the Gulf of Mexico and the Southeast Atlantic coast. The city of Bay St. Louis, Mississippi, surged from a three-day storm surge flood in 2000 to 22 days in 2020.

NOAA’s annual storm surge flood report is national average High tide flood for 3-7 days this year, Differences are expected depending on the region. The western part of the Gulf, including Texas and Louisiana, is expected to experience the most tidal floods in the 7th to 15th days. High tide floods are projected to occur in the northeastern Atlantic Ocean for 6 to 11 days. The Pacific coast is projected to range from 3 to 7 days, but floods will occur further north.

Floods that call it “nuisance” overlook the damage

Floods at high tide impede road use and increase stormwater and drainage system wear. The impact may seem minor, but as the frequency increases, these seemingly inconvenient flood days can have long-term consequences.

Areas that are already at risk of rising sea levels Property value is decreasingEspecially if cities and homeowners have not taken steps to improve flood resilience.Insurance premiums are starting to rise Reflect the actual risk,and Bond rating More and more tied up For community resilience efforts.

Flooded roads can create dangerous situations where first responders struggle to reach people in need safely. Enterprises get fewer visitors I feel a depressed loss of earnings. The more often this happens, the more it spreads to the entire coastal economy. It affects tax revenues and can undermine community ties.

sea ​​level rise Disproportionately impacts poor, marginalized communitiesAnd the effects of floods at high tide were no exception. People living in some of the least serviced coastal areas are facing higher premiums due to the risk of floods and storms. Sometimes over 90% An increase in insurance policies with a single zip code is expected.

How to reduce the threat of floods at high tide

NOAA forecasts provide valuable foresight to help local governments, real estate owners, and other coastal stakeholders act before the water rises.

The community has upgraded its infrastructure, such as raising roads and installing backflow prevention devices in rainwater systems, increasing freeboards, the distance required between the ground floor and the base flood level, and the base outside the current FEMA flood zone. You can change building standards such as flood level designation. To help the community prepare to withstand the high seas. Communities can also work with nature to protect and restore coastal habitats that provide natural flood protection, such as wetlands and barrier islands.

Pensacola, Florida is an example of an aggressive city.Recently completed Vulnerability analysis of sea level rise To determine where high tide floods begin to strain infrastructure, low-income areas, economic hotspots and critical facilities. The city could recommend where to prioritize action and what action is needed to prevent high tide floods from being expensive or damaging.

The message from the new report is clear. High tide floods and other more serious types of floods have already increased with rising sea levels and are expected to accelerate in the coming years. The community has the opportunity to act now to reduce its impact.

Coastal residents can contact local governments to encourage positive thinking. For more information on how to participate in coastal resilience, there are coastal resilience specialists in almost every coastal and Great Lakes state. Sea Grant Program..Each region NOAA office for coastal management We can also provide guidance on how to participate.

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Author: Renee Collini-Coastal Climate Resilience Specialist, Mississippi State University

Flood risk at high tide is accelerating, endangering the coastal economy

Source link Flood risk at high tide is accelerating, endangering the coastal economy

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