Why Are Floodplains Regulated?
The U.S. Congress established the National Flood Insurance Program (NFIP) in 1968. The intent of the NFIP is to minimize future flood damage, regulate short term impacts that can be associated with development and modifications of floodplains and provide property owners with flood insurance protection at a reasonable cost while preserving the natural and beneficial values served by floodplains. The NFIP assists communities by requiring that they adopt and administer local flood plain management measures. This effort is intended to protect lives and new construction from future flooding.
All transportation projects must avoid increasing base flood (100-year flood) elevations when developing in Special Flood Hazard Areas (SFHAs)/regulated floodplain zones delineated on FEMA Flood Insurance Rate Maps (FIRMs)
The Office of Environmental Services has developed a Floodplain Management Guidance for ODOT projects. The Guidance can be found here: