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Letter of Map Changes

Digital Flood Insurance Rate Maps (DFIRMs) are based on the best hydrological, hydraulic, topographic, and meteorological and survey information and engineering modeling available at the time of creating the maps. However, no map is perfect and no flooding situation is static. If a property owner believes that his or her property was mapped incorrectly by FEMA, they have the opportunity to retain the services of a Tennessee-licensed civil engineer or land surveyor and produce technical data and undertake the necessary engineering analysis to prove their case. The supporting document that is created is called an application for a “Letter of Map Change” (LOMC).

Use MT-1 form for:

  • Letter of Map Amendment (LOMA): A letter from DHS-FEMA stating that an existing structure or parcel of land that has not been elevated by fill (natural ground) would not be inundated by the base flood.
  • Conditional Letter of Map Amendment (CLOMA): A letter from DHS-FEMA stating that a proposed structure that is not to be elevated by fill (natural ground) would not be inundated by the base flood if built as proposed.
  • Letter of Map Revision Based on Fill (LOM R-F): A letter from DHS-FEMA stating that an existing structure or parcel of land that has been elevated by fill would not be inundated by the base flood.
  • Conditional Letter of Map Revision Based on Fill (CLOMR-F): A letter from DHS-FEMA stating that a parcel of land or proposed structure that will be elevated by fill would not be inundated by the base flood if fill is placed on the parcel as proposed or the structure is built as proposed.

Use MT-2 form for:

  • Conditional Letter of Map A Revision (CLOMR): letter from DHS-FEMA commenting on whether a proposed project, if built as proposed, would meet minimum NFIP standards or proposed hydrology changes [see 44 Code of Federal Regulations (CFR) Ch. 1, Parts 60, 65, and 72].
  • Letter of Map Revision (LOMR): A letter from DHS-FEMA officially revising the current NFIP map to show changes to flood plains, floodways, or flood elevations (see 44 CFR Ch. 1, Parts 60, 65, and 72).

LOMC Resources