for a Letter of Map Amendment (LOMA) uses an Elevation Certificate (prepared by a Registered Land Surveyor or Registered Professional Engineer) to ask FEMA to remove the flood insurance requirement on individual properties. Online Letter of map change FEMA's website "Change a Flood Zone Designation - Online Letter of Map Change" says homeowners and other interested parties may submit an Online Letter of Map Change (LOMC). FEMA says this can be used for property that was incorrectly included in a flood zone or if the addition of fill has elevated the property above the flood zone. Information on the property's location, legal description, and use of fill are required for FEMA to determine if the property is located in a flood zone. FEMA might request additional information. Letter of Map Revision For multiple properties or a larger area, an application for a Letter of Map Revision can be submitted when the landscape topography is different from that shown on the floodplain boundary and/or flood heights shown on the FIRM and the Flood Insurance Study. A Letter of Map Revision based on Fill (LOMR-F) is used when landscape topography is altered by humans, usually to increase the land elevation and remove land from the floodplain. A Conditional Letter of Map Revision (CLOMR) and Conditional Letter of Map Revision Based on Fill (CLOMR-F) are strongly advised as a mechanism to obtain FEMA feedback on the project before site changes are made, especially in light of the increasing attention on the nexus between the NFIP and the Endangered Species Act. 44 C.F.R. § 65.6(10) says "A revision of flood plain delineations based on topographic changes must demonstrate that any topographic changes have not resulted in a floodway encroachment." Proposed encroachments FEMA says that justifiable encroachment within the floodplain might include “construction or modification of a bridge, culvert, levee, or similar measure”. The NFIP prohibits communities to issue variances "within any designated regulatory floodway if any increase in flood levels during the base flood discharge would result". However, a community may request FEMA's prior approval for a justifiable encroachment that would increase the base flood level. This community request must include seven required submittals such as a request for conditional approval of map change, an evaluation of alternatives, a request for revision of base flood elevation determination, and a request for floodway revision. All requests for revision of base flood elevations must include supporting