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<br /> <br />23 <br /> <br /> <br />GLOSSARY OF TERMS <br /> <br />Flood <br /> <br />An overflow on lands not normally covered by water and <br />that are used or usable by man. Floods have two essential char- <br />acteristics: The inundation of land is temporary; and the land <br />is adjacent to and inundated by overflow from a river or stream or <br />an ocean, lake, or other body of standing water. <br />Normally a flood is considered as any temporary rise in <br />stream flow or stage, but not the ponding of surface water, that <br />results in significant adverse effects in the vicinity. Adverse <br />effects may include damages from overflow of land areas, temporary <br />backwater effects in sewers and local drainage channels, creation <br />of unsanitary conditions or other unfavorable situations by deposi- <br />tion of materials in stream channels during flood recessions, rise <br />of ground water coincident with increased stream flow, and other <br />problems. <br /> <br />Flood Crest <br />The maximum stage or elevation reached by the waters of <br />a flood at a given location. <br /> <br />Flood Plain <br />The relatively flat area or low lands adjoining the <br />channel of a river, stream, water course or ocean, lake or other <br />body of standing water, which has been or may be covered by <br />. floodwater. <br /> <br />Flood Profile <br />A graph showing the relationship of water surface ele- <br />vation to location, the latter generally expressed as distance <br />above mouth for a stream of water flowing in an open channel. It <br />is generally drawn to show surface elevation for the crest of a <br />specific flood, but may be prepared for conditions at a given <br />time or stage. <br />