Flood Map Updates
Flood risk changes over time due to natural and man-made changes. The corresponding flood maps are revised periodically to reflect these changes and to improve map accuracy using better data and technology. The City and County of Denver works with UDFCD and FEMA to study flood risk and update flood maps.
Major Flood Map Revisions ("Physical Map Revision" or PMR)
A PMR is a FEMA process that is used for large changes to the Flood Insurance Rate Map (FIRM) and are commonly used to incorporate UDFCD Flood Hazard Area Delineation (FHAD) studies into the FEMA FIRMs.
Minor Flood Map Revisions (called "Letter of Map Change" or LOMC)
- A FEMA Letter of Map Revision (LOMR) is used to update flood maps to reflect changes as a result of a construction project.
- A FEMA Letter of Map Amendment (LOMA) can be used to remove a building or property from the SFHA when inadvertently mapped in the SFHA. A successful LOMA can help reduce or eliminate flood insurance premiums. This typically requires the services of a Professional Land Surveyor and may require an elevation certificate. If you think you may be inadvertently mapped in the SFHA, please contact the City & County of Denver's Floodplain Management Group at firstname.lastname@example.org or 720-865-3215 for guidance.