What is implied by the term "letter of map revision" (LOMR)?

The term "letter of map revision" (LOMR) specifically refers to a formal request or process through which changes to a Federal Emergency Management Agency (FEMA) flood map are documented and communicated. This occurs when new information or data becomes available that affects flood hazard delineations, such as modifications in floodplain boundaries due to new construction, improved flood data, or changes in hydrology.

A LOMR serves to officially revise the FEMA flood map, ensuring that it reflects the most accurate and up-to-date information regarding flood risks for particular areas. This is crucial for stakeholders, including property owners and local officials, as it impacts flood insurance requirements and floodplain management practices.

Understanding what a LOMR entails is important for surveyors and other professionals involved in land development, as it affects planning, regulation, and compliance with floodplain standards. The other options do not focus on this specific and critical usage associated with FEMA flood mapping processes.