Corrections and revisions to the Federal Emergency Management Agency’s (FEMA’s) Flood Insurance Rate Maps (FIRM) are done through the Letter of Map Change (LOMC) process. LOMC is a general term that FEMA uses to refer to several types of map revisions that can be issued by letter. These include Letter of Map Amendment (LOMA), Letter of Map Revision based on Fill (LOMR-F), and Letter of Map Revision (LOMR).
A LOMA removes, by letter, a property and/or structure that has been inadvertently shown in the 100-year floodplain but is actually above the 100- year (base) flood elevation. A LOMA does not revise the 100-year floodplain boundaries. However, by removing the property and/or structure from the 100-year floodplain, it removes the mandatory requirement to purchase flood insurance in order to obtain a Federally-insured mortgage for the property and/or structure. Requests for a LOMA are done using FEMA’s MT-1 forms and application package. The MT-1 form must be signed by a licensed land surveyor, a registered professional engineer, or architect authorized by law to certify elevation information.
The MT-1 form is also used to request a LOMR-F. A LOMR-F is a revision to the FIRM based on fill that has been placed in the floodplain, but outside of the regulatory floodplain, to elevate land and structures above the 100-year (base) flood elevation. As with a LOMA application, an application for a LOMR-F must be signed by a licensed land surveyor, a registered professional engineer, or architect authorized by law to certify elevation information. A LOMR-F actually revises the 100-year floodplain boundary on the FIRM for Fauquier County. Because of this, a request for a LOMR-F must be signed by the County Administrator or his or her designee. Please note that the Fauquier County Zoning Ordinance generally does not allow fill to be placed within the 100 year floodplain without approval of a Special Exception.
A request for a LOMR is also done through the MT-1 forms and application process. A LOMR can revise the 100-year (base) floodplain boundaries, the 100-year (base) flood elevations, the regulatory floodway, and in some cases the county’s Flood Insurance Study (FIS). LOMRs are typically supported by a detailed Floodplain Study that more accurately determines the 100-year (base) flood boundaries and elevations relative to what is shown on the effective FIRM and sometimes the FIS. As is the case with other LOMCs, an application for a LOMR must be signed by a licensed land surveyor, a registered professional engineer, or architect authorized by law to certify elevation information. The detailed data and calculations used to perform the floodplain must also be certified by a licensed, registered professional. Because the LOMR officially revises the county’s FIRM, and sometime the FIS, a request for a LOMR must be signed by the County Administrator or his or her designee.