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<br />32 GUIDE TO FLOOD INSURANCE RATE MAPS <br /> <br />APPENDIX B <br /> <br />GLOSSARY <br /> <br />Actuarial Insurance Premiums <br />Premiums based on the calculated <br />magnitudes of flood risk to which <br />specific properties are subject. <br /> <br />Base Flood <br />The flood having a one-percent <br />probability of being equaled or exceeded <br />in any given year; also referred to as the <br />100-year flood. <br /> <br />Base Flood Elevation IBFE) <br />The height of the base flood in relation <br />to the National Geodetic Vertical Datum <br />of 1929 (or other datum where <br />specified). <br /> <br />Effective FIRM <br />Latest FIRM issued by FEMA, which is in <br />effect as of the date shown in the title <br />box of the FIRM as "Effective Date;' <br />"Revised;' or "Map Revised:' <br /> <br />Encroachment <br />Construction, placement of fill, or similar <br />alteration of topography in the floodplain <br />that reduces the area available to convey <br />floodwaters. <br /> <br />Extraterritorial Jurisdiction <br />Authority of a community to establish <br />land use zones and issue building <br />permits in areas outside its corporate <br />limits. <br /> <br />Flood Boundary and Floodway Map IFBFMI <br />Floodplain management map issued by <br />FEMA that depicts, based on detailed <br />analyses, the boundaries of the 100-year <br />and 500-year floods and the 100-year <br />flood way. <br /> <br />Flood Hazard Area/Ftoodplain/Flood- <br />prone Area <br />Land area subject to inundation by water <br />from any flooding source. <br /> <br />Flood Hazard Boundary Map IFHBM) <br />Initial insurance map issued by FEMA <br />that identifies, based on approximate <br />analyses, areas of 100-year flood hazard <br />within a community. <br /> <br />Flood Insurance Rate Map IFIRMI <br />Insurance and floodplain management <br />map issued by FEMA that identifies, <br />based on detailed or approximate <br />analyses, areas of 100-year flood hazard <br />in a community. Also shown on the FIRM <br />are actuarial insurance rate zones. In <br />areas studied by detailed analyses, the <br />FIRM also shows BFEs and 500-year <br />floodplain boundaries and, occasionally, <br />floodway boundaries. <br /> <br />Flood Insurance Study IFISI <br />Engineering study performed by FEMA to <br />identify flood-prone areas, insurance risk <br />zones, and other flood data within a <br />community. <br /> <br />Floodplain Management <br />The operation of a program of corrective <br />and preventive measures for reducing <br />flood damage, including, but not limited <br />to, emergency preparedness plans, flood <br />control works, and floodplain <br />management regulations. <br /> <br />Floodplain Management Regulations <br />Zoning ordinances, subdivision <br />regulations, building codes, health <br />regulations, special purpose ordinances, <br />