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Letter of Map Change

The purpose of this page is to define a Letter of Map Change (LOMC), a commonly used term in floodplain management.


Letter of Map Change (LOMC) is a general term used to refer to the several types of revisions and amendments to FEMA maps that can be accomplished by letter. They include Letter of Map Amendment (LOMA), Letter of Map Revision (LOMR), and Letter of Map Revision based on Fill (LOMR-F).

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Last Updated: 
03/27/2018 - 09:43