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<br />GLOSSARY OF TERMS <br /> <br />Flood. An overflow of lands, not normally covered by water, that <br /> <br /> <br />are used or usable by man. Floods have two essential character- <br /> <br /> <br />istics I the inundation of land is temporary; and the land is' <br /> <br /> <br />adjacent to and inundated by overflow from a river, stream, or <br /> <br /> <br />ocean, lake" or other body of standing water. <br /> <br /> <br />Normally, a "flood" is considered as any temporary <br /> <br /> <br />rise in streamflow or stage, but not the ponding of surface <br /> <br /> <br />water, that results in significant adverse effects..in the vicinity. <br /> <br /> <br />Adverse effects may include damages from overflow of land areas, <br /> <br /> <br />temporary backwater effects in sewers and local drainage channels, <br /> <br /> <br />creation of unsanitary conditions or other unfavorable situatione <br /> <br /> <br />by deposition of materials in stream channels during flood <br /> <br /> <br />recessions, rise of ground water coincident with increased <br /> <br /> <br />streamflow, and other problems. <br /> <br /> <br />Flood Crest. The maximum stage or elevation reached by the <br /> <br /> <br />waters of a flood at a given location. <br /> <br />Flood Plain. The relatively flat area or low lands adjoining <br /> <br /> <br />the channel of a river, stream or watercourse, or ocean, lake, <br /> <br /> <br />or other body of standing water, which has been or may be covered <br /> <br /> <br />~y floodwater. <br /> <br />Flood Profile. A graph showing the relationship of water sur- <br /> <br /> <br />face elevation to location, the latter generally expressed as <br /> <br /> <br />distance above mouth for a stream of water flowing in an open <br /> <br /> <br />channel. It is generally drawn to show surface elevation for the <br /> <br /> <br />crest of a specific flood, but may be prepared for conditions at <br /> <br /> <br />a given time or stage. <br /> <br />Flood StaQe. The stage or elevation at which overf~/of the <br /> <br /> <br />natural banks of a stream or body of water begins in the reach <br /> <br /> <br />or area in which the elevation is measured. <br /> <br />43 <br />