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 A
The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk 
information and supporting data used to develop the risk data. 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 
DFIRM Database is derived from Flood Insurance Studies (FISs), previously 
published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in 
support of the FISs and FIRMs, and new mapping data, where available. The FISs 
and FIRMs are published by the Federal Emergency Management Agency (FEMA). The 
file is georeferenced to earth's surface using the UTM ZONE 10N projection and 
coordiante system The specifications for the horizontal control of DFIRM data 
files are consistent with those required for mapping at a scale of 1:12,000.
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