The mapping may not accurately capture detailed hydrologic/hydraulic features such as canals, ditches, and stormwater infrastructure. They are determined solely by how well the elevation data captures the area’s drainage characteristics. Low-lying areas, displayed in green, are hydrologically 'unconnected' areas that may also flood. Areas that are hydrologically connected to the ocean are shown in shades of blue (darker blue = greater depth).

Water levels are relative to local Mean Higher High Water Datum. Click on icons in the map to view sea level rise simulations at specific locations. Use the vertical slider to simulate water level rise, the resulting inundation footprint, and relative depth. The NFHL is updated as new data reaches its designated effective date and becomes valid for regulatory use under the NFIP. It is a compilation of effective Flood Insurance Rate Map (FIRM) databases and Letters of Map Revision (LOMR). The NFHL dataset represents the current effective flood risk data for those parts of the country where maps have been modernized. It also has National Flood Insurance Program (NFIP) community information, map panel information, cross section and hydraulic structure information, Coastal Barrier Resource System information (if applicable) and base map information, such as road, stream and public land survey data. The NFHL provides users with the ability to determine the flood zone, base flood elevation and floodway status for a particular geographic location. Note: Performance and speed of data in this layer are directly dependant on FEMA as the data is generated from a map service running on their website.ĭescription: Effective regulatory flood hazard information is available as Geographic Information Systems (GIS) data in the form of the National Flood Hazard Layer (NFHL). These RSL scenarios begin in year 2000 and take into account global mean sea level rise (GMSL), regional changes in ocean circulation, changes in Earth’s gravity field due to ice melt redistribution, and local vertical land motion. al, 2012) global scenarios which were developed as input to the 3rd National Climate Assessment. These RSL scenarios provide a revision to the (Parris et. Global Change Research Program (USGCRP) and the National Ocean Council as input to the USGCRP Sustained Assessment process and 4th National Climate Assessment. These new scenarios were developed by the Sea Level Rise and Coastal Flood Hazard Scenarios and Tools Interagency Task Force, jointly convened by the U.S. The five relative sea level rise (RSL) scenarios shown in this tab are derived from NOAA Technical Report NOS CO-OPS 083 “Global and regional sea level rise scenarios for the United States” using the same methods as the USACE Sea Level Rise Calculator.

Duval county flood zone map