IN or OUT of Special Flood Hazard Area (100 year flood zone)īFE. Independent quality control testing of the individual FIRM Database components of the NFHL was also performed. The range of differences between the ground elevation (defined from the topographic data used for the Flood Risk Project) and the computed flood elevation is between +/- 1.0 foot at the 95% confidence interval for areas with high population within the floodplain and/or high anticipated growth and Special Flood Hazard Areas (SFHAs) with high flood risk to +/- one-half the contour interval at the 85% confidence interval for areas with low population and densities within the floodplain and small or no anticipated growth and SFHAs with low flood risk. A horizontal accuracy of +/- 38 feet is used to determine the compliance with the vertical tolerances defined for each risk class. The tolerance for how precisely the flood elevation and the ground elevation must match varies based on the flood risk class, which is a function of population, population density, and/or anticipated growth in floodplain areas. The reliability of the floodplain boundary delineation is quantified by comparing the computed flood elevation to the ground elevation at the mapped floodplain boundary. (from FEMA metadata) Time Period of Contentįlood zone, floodplain, hazard, Flood Insurance Rate Map, FIRM, NFIP, flooding Place Keywords
NFIP FLOOD MAPS ARCHIVE
The FIRM Database serves to archive the information collected during the Flood Risk Project. The FIRM Database presents the flood risk information depicted on the FIRM in a digital format suitable for use in electronic mapping applications. In addition to the identification of Special Flood Hazard Areas (SFHAs), the risk zones shown on the FIRMs are the basis for the establishment of premium rates for flood coverage offered through the NFIP. requires the purchase of flood insurance by property owners who are being assisted by Federal programs or by Federally supervised, regulated or insured agencies or institutions in the acquisition or improvement of land facilities located or to be located in identified areas having special flood hazards, " Section 2 (b) (4) of the Flood Disaster Protection Act of 1973. Insurance applications include enforcement of the mandatory purchase requirement of the Flood Disaster Protection Act, which ".
The FIRM is the basis for floodplain management, mitigation, and insurance activities for the National Flood Insurance Program (NFIP).
NFIP FLOOD MAPS UPDATE
The FEMA Flood Zones data shows areas that have a 1% annual chance of a flood event (100-year flood zone)Īnd areas that have a 0.2% annual chance of a flood event (500-year flood zone).įEMA calls flood zone data the Flood Insurance Rate Map (FIRM) database.ĭFIRM is a digital version of FEMA's new updated Flood Insurance Rate Maps (FIRM).įEMA is engaged in a multi-year process to update all FIRMs in the US.
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