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). This file is georeferenced to the Earth's surface using the Geographic Coordinate System (GCS) and North American Datum of 1983 (NSRS-2007). The specification for the horizontal control of FIRM Databases is consistent with those required for mapping at a scale of 1:12,000. The FISs and FIRMs are published by FEMA. The FIRM Database is derived from Flood Insurance Studies (FISs), previously published FIRMs, flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The FIRM Database depicts flood risk information and supporting data used to develop the risk data. The FIRM Database is the digital, geospatial version of the flood hazard information (location and attributes for boundaries of flood insurance risk zones) shown on the published paper Flood Insurance Rate Maps (FIRMs). Any preliminary or draft data that appear on maps displayed at community meetings, etc., are not included here. The NFHL is updated as new data reaches its designated effective date and becomes valid for regulatory use under the National Flood Insurance Program (NFIP).Īll data included in this layer are considered "final" by FEMA. Flash floods are the #1 cause of weather-related deaths in the US.This layer is a compilation of effective Flood Insurance Rate Map (FIRM) databases and any Letters of Map Revision (LOMR) that have been issued against those databases since their publication date. If there is a chance of flash flooding, move immediately to higher ground.These areas can flood quickly and with little warning. Avoid camping or parking along streams, rivers, and creeks during heavy rainfall.Just 6 inches of moving water can knock you down, and 1 foot of water can sweep your vehicle away.For areas of alluvial fan flooding, velocities also determined.Ĭoastal flood zone with velocity hazard (wave action) no BFE determined.Ĭoastal areas with a 1% or greater chance of annual flooding with increased risk due to storm waves base flood elevations determined.Īreas in which flood hazards are undetermined, but possible. Flood depths of 1 to 3 feet (usually sheet flow on sloping terrain) average depths determined. The flood way is the channel of stream plus any adjacent floodplain areas that must be kept free of encroachment so that the 1% annual chance flood can be carried without increasing the BFE.ġ% chance of annual shallow flooding Flood depths of 1 to 3 feet (usually areas of ponding) base flood elevations determined.ġ% or greater chance of annual shallow flooding. Special Flood Hazard Areas (SFHAs)Īreas of 500-year flood (0.2% chance of annual flooding) areas of 100-year flood with average depths of less than 1 foot or with drainage areas less than 1 square mile and areas protected by levees from 100-year flood.Īreas determined to be outside 500-year flood plain.ġ% chance of annual flooding No base flood elevations determined.įlood way areas in Zone AE. Visit the DLNR Flood Hazard Assessment Tool to find out if you are located in a SFHA. FEMA developed Flood Insurance Rate Maps (FIRMs) that determine Special Flood Hazard Areas (SFHAs). Knowing your flood zone means you know your flood hazard risk.
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