ater.Floodplains represents the mapped areas in Utah that are prone to flooding. This layer was creating using criteria as defined by the Flood Insurance Rate Maps (FIRM) and produced by the Federal Emergency Management Agency (FEMA).
The FIRM is the basis for floodplain management, mitigation, and insurance activities for the National Flood Insurance Program (NFIP). Insurance applications include enforcement of the mandatory purchase requirement of the Flood Disaster Protection Act, which "... 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. 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.
The DFIRM Database presents the flood risk information depicted on the FIRM in a digital format suitable for use in electronic mapping applications. The DFIRM database is a subset of the Digital FIS database that serves to archive the information collected during the FIS.
Floodplains Zone information can be found at the FEMA Map Service Center (MSC) and in the FEMA National Flood Hazard Layer.
One thing to keep in mind with the zone designations is the difference between "Shaded X" and "Unshaded X". In the link above, Shaded X represents the 0.2% annual chance floodplain (the 500-year flood). In almost all of the DFIRMs, the ZONE field will read: 0.2 PCT ANNUAL CHANCE FLOODPLAIN or something like that, and in some DFIRMs it will just read: Shaded X. Confusingly, when the ZONE field is just "X", that means Unshaded X, which is outside of the 500-year floodplain.
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