Find your property or project to see if it is located in the regulatory floodplain. Click on the map or use the search tool to obtain more detailed floodplain information. In Denver the regulatory floodplain is the same as the Special Flood Hazard Area (SFHA). SFHAs are high flood risk areas designated by FEMA as Zones A, AE, AH, AO, AR, and A99. The FEMA SFHAs are subject to inundation (flooding) by the 1% annual chance flood event (100-year flood). Properties in these zones are more prone to flooding and are at increased risk during large storms. Over the course of a 30-year mortgage, there is a 26% chance that a property in a SFHA will be affected by a flood event. The SFHA is used by lenders to determine if flood insurance is required. All construction (including interior remodels) in a SFHA requires a Sewer Use and Drainage Permit (SUDP) for floodplain use. See links below for floodplain regulations and permit submittal requirements. The floodplain data contained herein is taken from the National Flood Hazard Layer (NFHL) which is publicly available from FEMA. This map does not constitute all flood risk in Denver, see the Flood Information page at the link below for additional flood mapping and flood resources.