![]() A second difference is that First Street uses current and projected precipitation and sea level data. One difference between the First Street and FEMA SFHA designations is due to the fact that FEMA has not mapped all areas of the country. Orange colors have minor to moderate risk (scores 2 to 6), darker red and maroon dots have severe to extreme risk (scores 7 to 10). Flood risk score for Rapid City properties in 2020 as determined by First Street Foundation. Currently, only about 10 percent of the city’s homes and businesses are at risk.įigure 1. The city of Aberdeen has the highest percentage increase of flood risk in the next 30 years, with a four percent increase in properties at risk. This does not include any new construction that may occur between now and then. Rapid City has the highest number of total properties at risk of flooding, with over 4,500 today and a projected increase of almost 50 more by the year 2050. ![]() Other Black Hills communities of Hot Springs, Spearfish and Box Elder all have 20 percent or more of their properties at risk of flood, both now and in the year 2050. This number is virtually unchanged in 30 years’ time after taking into account projections of rain and river flooding. In South Dakota, the city with the largest proportion of properties at risk is Sturgis, with 40 percent of their properties at risk in 2020. By 2050, the number of properties with substantial risk across the country is estimated to increase to 16.2 million. This equates to an additional 5.9 million properties nationwide that are not currently identified within the FEMA SFHA zones. According to the Flood Model, an estimated 14.6 million properties face significant flood risk compared to the 8.7 million properties at risk in the FEMA floodplain maps. The Foundation’s Flood Model identifies approximately 1.7 times the number of properties facing substantial risk in 2020 compared to the FEMA SFHA designations. Current flood risk is presented alongside projections of up to 30 years in the future.Ī key finding in the report indicates that many more American homes and businesses are currently at risk of severe flooding compared to properties located in the Federal Emergency Management Agency’s (FEMA) existing floodplain maps, called Special Flood Hazard Areas (SFHA). ![]() but also provides details for each state, county and city. The report provides an overall assessment of flood risk for the U.S. ![]() The findings were produced from the Foundation’s Flood Model which assesses flood risk at a very high resolution, at the level of individual properties. ![]() In summer 2020, the nonprofit research group First Street Foundation published a comprehensive national report on the state of flood risk in the continental U.S. In comparison, the FEMA Flood Insurance Rate Maps currently identify 24,900 properties as having substantial risk. In 2020, 62,600 total properties are at substantial risk, with a projected increase to 63,000 properties by 2050. South Dakota’s flood risk is increasing in some areas of the state according to a recent report from the First Street Foundation. ![]()
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