The Basics | Impacts – U.S. Sea Level Change

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</a> </li> </ul> </nav> <script> $(document).ready(function() { $('.middle_nav_toggler').click(function(e){ e.preventDefault() $('.middle_nav .secondary_nav').toggleClass('mobile_middlenav_open') $('.middle_nav .secondary_nav .middle_nav_items').slideToggle(100); }) $('.middle_nav_item .arrow_box').click(function(e){ e.preventDefault(); $(e.currentTarget).siblings('.middle_subnav_container').slideToggle(); $(e.currentTarget).toggleClass('reverse'); }) }) </script> <nav class='tertiary_nav tertiary_nav_desktop'> <ul class='middle_nav_items'> <li class='current'> <a href="/sea-level-101/impacts/the-basics/">The Basics</a> <div class='tertiary_nav_arrow'></div> </li> <li class=''> <a href="/sea-level-101/impacts/dive-deeper/">Dive Deeper</a> <div class='tertiary_nav_arrow'></div> </li> </ul> </nav> <nav class='tertiary_nav tertiary_nav_mobile'> <div class='nav_label'> MENU </div> <select onchange='main.changePage(this.value);'> <option selected='selected' value='/sea-level-101/impacts/the-basics/'> The Basics </option> <option value='/sea-level-101/impacts/dive-deeper/'> Dive Deeper </option> </select> </nav> </div> <div data-react-class="CherTools" data-react-props="{"share":[["Facebook"],["Twitter"],["Pinterest"],["Email"]]}" data-react-cache-id="CherTools-0" class="chertools_floater"></div> <section class='content_page module feature_pages banner_present'> <article> <div id='on_this_page_column'> <div data-react-class="OtpDesktopNav" data-react-props="{}" data-react-cache-id="OtpDesktopNav-0"></div> </div> <div id='primary_column'> <div data-react-class="OtpMobileNav" data-react-props="{}" data-react-cache-id="OtpMobileNav-0"></div> <div class='wysiwyg_content'> <p><div class='snippet_box_container with_frame_title'> <div class='snippet_box_module'> <fieldset class='snippet_box_inners' role='presentation'> <legend class='frame_title'> Takeaways </legend> <p class='description'> <ul> <li>Impacts from sea level rise will differ across the U.S.’s diverse coastlines.</li> <li>Many places in the U.S., particularly along the East and Gulf coasts, will experience more frequent and widespread flooding from high tides and storms as sea levels rise over the next 30 years and beyond.</li> <li>High tide flooding is already happening at twice the rate it was 20 years ago along U.S. coastlines.</li> <li>Additional impacts, including erosion, property damage, and habitat loss will reshape coastal landscapes creating structural, environmental, and economic challenges for many communities. </p> </fieldset> </div> </div></li> </ul> <h2><span class="mb_anchor_title">Sea Level Rise Worsens Flooding<a class="mb_anchor" name="sea_level_rise_worsens_flooding"></a></span><b>Sea Level Rise is Making Flooding Worse</b></h2> <p>Sea levels are rising due to human-caused climate change. However, this rise varies from place to place, and so does its impacts on the United States' diverse coastlines. As sea levels rise, many coastal places will experience more frequent and widespread flooding during high tides and storms over the next 30 years and beyond. This is because sea level rise adds height on top of already existing sea levels. For example with 4 inches of sea level rise, if a water level used to reach 12 inches high during high tide or a storm, that same event would now reach 16 inches or more. And that extra height can push a flooding event further inland, causing greater damage. </p> <p>This will only get worse as sea levels rise further in the coming decades and longer. For example, <a class="glossary_link" href="/resources/glossary/?alpha=A-Z:title&ss_id=381" title="Water levels exceed about 3 ft (0.9 m) above average high tide. These floods tend to cause more damage than minor floods (e.g., to homes for businesses)">moderate</a> <a class="glossary_link" href="/resources/glossary/?alpha=A-Z:title&ss_id=478" title="High tide flood days occur when water levels exceed heights that are calibrated to the depth-severity impact thresholds of the NOAA National Weather Service and local emergency managers to trigger public notification of impending flood risks.">high tide flooding</a> which causes damage to buildings and infrastructure currently happens less than once per year on average in East and Gulf coasts communities. However, by 2050 these same flooding events are projected to occur 3-10 times per year. </p> <div class='faq_floater_container'> <aside class='faq_floater module'> <div class='question expanding_list_item'> <a class='mb_anchor_faq' id='question_116' name='question_116'></a> <div class='title_container' id='title_container_question_116'> <div class='title'> What does it mean when the 2022 Interagency Technical Report says there will be a “flood regime shift” by 2050? </div> </div> <div class='text answer'> <p>The 2022 technical report provides information on extreme water levels, ranging from rare to common flooding events, to assess current and future flood exposure considering sea level rise. By 2050, there is expected to be a "flood regime shift," where the frequency of moderate high tide flooding will exceed today's frequency of minor flooding due to rising sea levels. This means that tides and storm surges currently causing minor floods will lead to more severe flooding events, impacting infrastructure and requiring emergency responses more frequently.</p> <a class='answer_detail_link' href='/faq/116/what-does-it-mean-when-the-2022-interagency-technical-report-says-there-will-be-a-flood-regime-shift/' id='answer_detail_116'> Detailed answer </a> </div> </div> </aside> </div> <script> $(document).ready(function(){ $('#title_container_question_116').click(function(){ $(this).toggleClass("open"); $(this).siblings('.answer').slideToggle() }); }); </script> <p>The impact of sea level rise has already been felt by many coastal communities in the U.S. Due to sea level rise, in 2024 the U.S. now experiences five more days where flooding occurs compared to what happened in 2000. These impacts are being experienced most prominently along the East and Gulf coasts of the U.S. where sea levels are rising the fastest.</p> <p>To find out more about changes in flooding related to sea level rise in your area, go to the <a href="/national-sea-level-explorer/" target="_self">National Sea Level Explorer</a>.</p> <div data-react-class="Video" data-react-props="{"files":[{"file":"/rails/active_storage/blobs/redirect/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBBclVJIiwiZXhwIjpudWxsLCJwdXIiOiJibG9iX2lkIn19--a684f0ceaf8440c302cd9e7813575a37aa935b21/noaa-slrtr-impacts-highres.mp4?disposition=inline"},{"file":"undefined"},{"file":"undefined"}],"vtt_files":[{"file":"/internal_resources/838/noaa-slrtr-impacts-highres (1).vtt"}],"caption":"Find out how sea level rise increases the frequency and severity of flooding; Video courtesy of NOAA Office for Coastal Management.","poster":"/rails/active_storage/blobs/redirect/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBBcmNJIiwiZXhwIjpudWxsLCJwdXIiOiJibG9iX2lkIn19--50b643564727c9a8621859f0178e7888c60f05df/Screenshot%202024-07-30%20at%208.32.35%E2%80%AFPM.png?disposition=inline","video_div":"video_80142","layout":"column-width","autostart":false,"plays_inline":true,"vrview":"false","vrview_stereo":"true","title":"How Will Sea Level Rise Impact Flooding?","display_caption":true,"autoloop":false,"controls":"minimal"}" data-react-cache-id="Video-0" class="column-width video_player_container"></div> <h2><span class="mb_anchor_title">Impacts to Coastal Communities<a class="mb_anchor" name="impacts_to_coastal_communities"></a></span><b>Sea Level Rise Also Impacts Coastal Communities’ Land, Infrastructure, Economies, and People</b></h2> <p>In addition to flooding, there are a variety of other impacts from sea level rise coastal communities are already starting to experience. Many of these impacts are happening at the same time, leading to extra stress on communities. Communities that lack resources to protect them or to adapt are at even higher risk of harm. </p> <p>At the shoreline, the added height from sea level rise can speed up <a class="glossary_link" href="/resources/glossary/?alpha=A-Z:title&ss_id=483" title="The wearing away of land, or the removal of beach or dune sediments by wave action, tidal currents, wave currents or drainage. A combination of episodic inundation events and relative sea-level rise will serve to accelerate coastal erosion.">erosion</a>. Erosion can impact natural habitats and lead to the loss of land and property. When combined with flooding, erosion can damage roads, bridges, sewage systems, power plants, and other key infrastructure for the community. This can lead to health risks through the spread of waterborne diseases.</p> <p>Below ground, saltwater can seep into freshwater aquifers as sea levels rise, known as <a class="glossary_link" href="/resources/glossary/?alpha=A-Z:title&ss_id=484" title="As the sea-levels rise, the “salt front” (location of the freshwater-saltwater line) may progress further inland. This encroachment may be further exacerbated by drought, reduced rainfall or changes in water use and demand. Saltwater intrusion can result in the need for water utilities to increase treatment, relocate water intakes, or development of alternate sources of freshwater.">saltwater intrusion</a>. When saltwater mixes with the fresh groundwater, the water becomes unusable for drinking and agriculture. Furthermore, coastal and marine ecosystems that support industries and provide natural storm protection, resources and ways of life are all at risk of changing or degrading due to sea level rise.</p> <p>Sea level rise impacts can lead to economic hardships for a community. In particular, communities that rely on coastal tourism, fisheries, and shipping may feel the impacts most deeply. Plus, many coastal communities also have a rich history that ties their culture to the water. These changes could lead to a loss of heritage sites or cultural practices. </p> <p>However, actions are being taken in many coastal communities to help plan for and address these impacts.</p> <p><b>Dive Deeper: </b><b><a href="/sea-level-101/impacts/dive-deeper/">The many factors that influence the impacts of sea level rise on coastal communities.</a></b></p> <aside class='aside_module promo'> <a class='image_column' href='/national-sea-level-explorer/' target='_self'> <div class='aside_module_image'> <img alt="graph data" src="/internal_resources/720/guide-promo.jpeg" /> </div> </a> <div class='text_column'> <header> <h2 class='boxed_module_title'> Prepare for a More Resilient Future </h2> </header> <div class='aside_body'> <p> View past, present and future sea level rise and impacts for the coastlines of the United States. </p> </div> <p> <a class='aside_link' href='/national-sea-level-explorer/' target='_self'> National Sea Level Explorer </a> </p> </div> </aside> <hr /> <p><a 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The Basics | Impacts – U.S. Sea Level Change