Letter of Map Amendment (LOMA): An official revision to a FEMA map done by describing the property affected. The study contains such background data as the base flood discharges and water surface elevations that were used to prepare the FIRM.įloodplain: Any land area susceptible to being inundated by flood waters from any source.įloodway: The channel of a river or other watercourse and that portion of the adjacent floodplain that must remain open to permit passage of the base flood without cumulatively increasing the water surface elevation more than a designated height (usually one foot).įreeboard: A margin of safety added to the base flood elevation to account for waves, debris, miscalculations, or lack of data. An official map of a community, on which the Federal Emergency Management Agency has delineated both the Special Flood Hazard Areas and the risk premium zones applicable to the community.įlood: A general and temporary condition of partial or complete inundation of normally dry land areas.įlood fringe: The portion of the floodplain lying outside of the floodway.įlood hazard mitigation: All actions that can be taken to reduce property damage and the threat to life and public health from flooding.įlood Insurance Study: A report published by FEMA for a community issued along with the community's Flood Insurance Rate Map (FIRM). Wave heights during the base flood will generally be three feet or more in height above the stillwater elevation.Ĭommunity Rating System: A program that provides a flood insurance premium rate reduction based on a community’s floodplain management activities.įIRM: Flood Insurance Rate Map. The base flood is used by the NFIP as the basis for mapping, insurance rating, and regulating new construction.īase floodplain: The area of water and land inundated by the base flood.Ĭoastal high hazard area: That part of the coastal floodplain extending from offshore to the inland limit of the primary coastal dune along an open coast and any other area subject to high velocity wave action from storms and seismic sources. Here are a select few terms which are used regularly within our area:īase flood depth: A measurement of the base flood in feet above ground, used for shallow flooding.īase flood: The flood having a 1% chance of being equaled exceeded in any given year. For a complete list of terms, please see the FEMA Glossary document links at the bottom of the screen. FEMA and the National Flood Insurance Program use quite a few terms that can be at some times quite technical to describe flood processes.

Fema flood zone a7