{"id":950,"date":"2022-06-28T08:02:01","date_gmt":"2022-06-28T12:02:01","guid":{"rendered":"https:\/\/dev.seagrant.w3.uvm.edu\/2022\/06\/28\/new-tool-for-conservation-and-restoration-planning-floodplain-maps-for-vermonts-lake-champlain-basin\/"},"modified":"2025-10-22T17:49:12","modified_gmt":"2025-10-22T21:49:12","slug":"new-tool-for-conservation-and-restoration-planning-floodplain-maps-for-vermonts-lake-champlain-basin","status":"publish","type":"post","link":"https:\/\/www.uvm.edu\/seagrant\/2022\/06\/28\/new-tool-for-conservation-and-restoration-planning-floodplain-maps-for-vermonts-lake-champlain-basin\/","title":{"rendered":"New Tool for Conservation and Restoration Planning: Floodplain Maps for Vermont\u2019s Lake Champlain Basin"},"content":{"rendered":"

\n\tLand use planners and researchers in Vermont now have access to maps that show how floods of different sizes are expected to spread across surfaces within river valleys<\/a>.\u00a0<\/p>\n

\n\tCreated to show a simplified representation of what different severity flood zones might look like across the landscape for conservation and land-use planners, each color on the maps represents how water that spreads out from riverbanks might look for eight storm sizes, from 2-year to 500-year flood probabilities.<\/p>\n

\n\tResearchers at the University of Vermont, Dr. Rebecca Diehl, of the Department of Geography, and Dr. Kristen Underwood, of the Department of Civil and Environmental Engineering, have generated a continuous map of topographically defined floodplains for Vermont\u2019s Lake Champlain basin rivers that drain more than two square miles.<\/p>\n

\n\t\u201cThis new mapping product also adds more detailed information on frequency of flooding by identifying the relative frequency of how rising water covers land features within the floodplain, ranging from frequently to rarely flooded,\u201d said Diehl.<\/p>\n

\n\tThe maps rely on publicly available datasets including topography or measurement of elevations. Researchers used the state of Vermont\u2019s publicly available high-resolution topographic data collected during airplane flights using Light Detection and Ranging (LiDAR), a remote sensing method that uses a pulsed laser light to measure distances to the Earth. The speed with which the laser beams bounce back to the detector in the plane gives information to determine the elevation of the land.<\/p>\n

\n\tFloodplains maps are intended for planning and research use by government, academic, commercial, and non-governmental agencies. They offer a greater geospatial coverage of floodplains in the basin than Federal Emergency Management Agency (FEMA) Flood Insurance Rate Maps, but they are not a substitute for FEMA maps and are not intended for regulatory use.\u00a0<\/p>\n

\n\t“These flood inundation layers will support many regional studies. For example, we expect these maps could help state-wide decision makers to assess the spatially varying risks of extreme flooding events under a changing climate, including disproportional impacts on underrepresented populations,” said Underwood.<\/p>\n

\n\tResearch and partnerships in support of Vermont\u2019s Functioning Floodplain Initiative<\/strong><\/p>\n

\n\tThis Lake Champlain Sea Grant-funded work contributed to Vermont\u2019s Functioning Floodplain Initiative<\/a> (FFI), a partnership between the state Agency of Natural Resources and other public and private entities to develop methods and mapping to identify, restore, and protect high priority stream, wetland, and floodplain functions. Functioning floodplains support ecosystem services, such as:<\/p>\n