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The MS-NFHL Web Map Viewer is a service provided by the Mississippi Department of Environmental Quality – Office of Geology. 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. 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 flood hazard data used on the MS-NFHL Web Map Viewer is the Mississippi portion of FEMA’s National Flood Hazard Layer (NFHL). The NFHL is a computer database that contains the flood hazard map information from FEMA’s Flood Map Modernization program. These map data are from Digital Flood Insurance Rate Map (DFIRM) databases and Letters of Map Revision (LOMRs).
Shortly after new Mississippi Countywide DFIRM data are adopted by county and local governments and have become effective, FEMA adds the new DFIRM data to the NFHL. The flood hazard data viewed in the MS-NFHL Web Map Viewer will be updated by MDEQ approximately 4 times a year, at the beginning of each quarter. Viewers using the MS-NFHL Web Map Viewer are provided with the capability of using the MS-NFHL flood hazard data with their choice of a street map with parcel outlines and shaded terrain base map, a topographic base map, or two different orthophoto imagery base maps. Additionally, a measuring tool, address finder and decimal degree Lat-Long locator are provided. The transparency level of the overlaid flood hazard data is also adjustable to aid in viewing property or buildings which may fall inside the special flood hazard areas. For information or questions about the MS-NFHL Web Map Viewer contact the MDEQ Office of Geology by e-mail to Stephen Champlin: Stephen_Champlin@deq.state.ms.us.