Flooding is a concern for many living in inland and coastal areas of Massachusetts. With climate change, this is likely to occur more frequently. To learn more about flood insurance, click here to visit the FEMA National Flood Insurance Program site. Over 400,000 Massachusetts residents currently live in a 100-year flood zone, which means more than a 1 in 4 chance of a flood during a 30-year mortgage period. While governments are doing all they can to alleviate the impact of floods, everyone should play a role in protecting themselves. This is important because the National Flood Insurance Program’s (NFIP) floodplain management regulations are enforceable in the SFHA, including the mandatory purchase of flood insurance.įEMA encourages everyone to get flood insurance, even if you don’t live in a high-risk flood zone. To obtain a closer look at an address, FEMAs Flood Map Service Center (MSC) is the official public source for flood hazard information produced in support of. The San Antonio Floodplain Viewer also shows moderate flood hazard areas, which are represented between the limits of the base flood (1 percent annual chance) and the 0.2 percent annual chance (or 500-year) flood.īy no coincidence, the Special Flood Hazard Area (SFHA)-as defined by FEMA-is the land area covered by the floodwaters of the base flood-that is the 1-percent annual chance flooding event. During the span of a 30-year mortgage, these areas. This 1 chance flood is also known as the base flood or 100-year flood. The San Antonio River Authority Floodplain Viewer outlines the 1-percent annual chance flood boundaries-indicating that those areas will be inundated by a flood event that has a 1-percent chance of being equaled or exceeded in any given year. Areas with a 1 chance or higher of flooding are considered high risk. Thus, the base flood can also be called the “1-percent annual chance flood.” The base flood, or 100-year flood, is the flooding event that statistically has a 1-percent chance of occurring in any given year. To download FEMA Flood Data Sets, please visit What is the “base flood?” Together with its many Bexar Regional Watershed Management (BRWM) partners, the San Antonio River Authority performs engineering studies to develop the data used in these digital maps, providing basic information about the floodplains in Bexar, Wilson, Karnes and Goliad counties. Floodplain Mapping APC Index Map City LA FEMA Flood 10 North Valley APC East FEMA Flood 10 North Valley APC West FEMA Flood 10 West Los Angeles APC FEMA. The River Authority Floodplain Viewer engages users in an interactive floodplain map, displaying the Federal Emergency Management Agency’s (FEMA) National Flood Hazard Layer (NFHL) data. Household Hazardous Waste Collection Service.Draft Floodplain Maps & Public Meetings.These are known as numbered A Zones (e.g., A7 or A14). Because detailed analyses are not performed for such areas no depths or base flood elevations are shown within these zones. San Antonio River Basin Report Card 2022 Areas with a 1 annual chance of flooding and a 26 chance of flooding over the life of a 30year mortgage.
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