This report discusses using flood maps that are provided by FEMA. From the text: "Among the tools that the Mitigation Directorate uses to assist government officials and citizens in preparing for, responding to, and recovering from flood disasters are the 'Flood Maps.' Over the history of the National Flood Insurance Program (NFIP), the Flood Maps have taken many forms and been referred to by different names. In the early years of the NFIP, the Flood Maps were referred to as Flood Hazard Boundary Maps (FHBMs). From the late 1970s to the end of the 20th Century, the Flood Maps were referred to as Flood Insurance Rate Maps(FIRMs) and Flood Boundary and Floodway Maps, or FBFMs."
United States Federal Emergency Management Agency: http://www.fema.gov/