Floodplains Outline: Washington, D.C.
- District of Columbia GIS Program
- 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 event2-percent-annual-chance flood event The DFIRM Database is derived from Flood Insurance Studies (FISs) The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). The file is georeferenced to earth's surface using the UTM projection and coordinate system. The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12000. Insurance applications include enforcement of the mandatory purchase requirement of the Flood Disaster Protection Act In addition to the identification of Special Flood Hazard Areas (SFHAs) 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.
- ArcGIS Open Data
- Washington, D.C., United States
- Transportation, Environment, Elevation, Structure, Inland Waters, Digital Flood Insurance Rate Map, Floodway, FEMA flood hazard zone, Riverine flooding, Special flood hazard area, Base flood elevation, Hydrology, and Flood Insurance Rate Map
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- More details at
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