![]() 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. 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. 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. 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. 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.San Antonio River Basin Report Card 2022.The buildings appear when zoomed-in and areĬlickable to return an approximate ground elevation from LiDAR.įlood Hazard Layer (NFHL) Viewer which has the capability of printing a NFHLįIRMette or Full FIRM. Hillshade are included in a dropdown menu where the user can turn them on/offĪnd adjust the transparency level. NFHL hazard data, building footprints, and LiDAR colored elevation or grey Measuring tool, address search, USGS Elevation Point Query Service, PLS sectionįinder, and decimal degree Lat-Long locator are provided. Terrain, topographic, or orthophoto imagery base maps. MDEQ will then update the flood hazard data viewed in the MS-NFHL Web MapĬapability of using the flood hazard data with a choice of street maps, shaded Governments and have become effective, FEMA will add the new DFIRM data to the When new Mississippi DFIRM data are adopted by county and local These map data are from Digital Flood Insurance Rate Map (DFIRM) databases and Letters of Map Revision (LOMRs). ![]() The NFHL is a computer database that contains the flood hazard map information from FEMA’s Flood Map Modernization program. The flood hazard data used on the MS-NFHL Web Map Viewer is the Mississippi portion of FEMA’s National Flood Hazard Layer (NFHL). Additionally, the MS-NFHL Web Map Viewer is specifically intended to assist city and county floodplain management and building officials in their day to day work activities when quick and easy access to digital flood hazard data is required. The purpose is to provide the public, state, city and county government officials a quick and easy low cost way to view and use FEMA GIS based Digital Flood Insurance Rate Map (DFIRM) data. The MS-NFHL Web Map Viewer is a service provided by the Mississippi Department of Environmental Quality – Office of Geology. ![]() Launch Map Viewer - New Javascript Viewer ![]()
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