FLOOD04420 - Laserfiche WebLink

Home Browse Search

e e e Backwater Flooding Bank Full Stage Base Flood Encroachment Freeboard Flood Bouudary and Floodway Map FloodplaiuIFlood Hazard Area Flood Hazard Bouudary Flood Stage Gage Reading Headwater Flooding Nat.ional Geodetic Vertical Datum (NGVD) Responsible Local Official Zero Gage Glossary Flooding caused by water "backing" into an unprotected area from rising major rivers. The river stage when the water is at the average natural ground elevation. Some miuor flooding of low lying areas can be expected prior to bauk full stage. The flood having a one-percent probability of being equalled or exceeded in any given year; also referred to as the 100-year flood. Construction, placement of fill, or similar alteration of topography in the floodplain that reduces the area available to convey floodwaters. The amount of protection provided by a flood works above the designated crest height of a flood. Floodplain management map issued by FEMA that depicts the boundaries of the lOO-year and 500-year flood and the 100-year floodway Land area subject to inundation by water from any flooding source. Iuitial insurance map issued by FEMA that identifies areas of 100-year flood hazards. The river stage established by the National Weather Service when appreciable flood damages begiu to urban or agricultural properties. The reading of the actual water height at a gaging station. Flooding caused by an unusually heavy rainfall unable to run off fast enough. Refers to elevations above mean sea level (MSL). County judge, levee board president, mayor, state, couuty, city, emergency service officials, etc. A number that must be added to a gage reading to obtain the height of the gage above Mean Sea Level. 1- 1