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<br /> <br /> <br />GLOSSARY OF TE~1S <br /> <br /> <br />Oeck <br /> <br />Surface of roadway or top of railroad ties at center of <br /> <br />bridge. <br /> <br />Flood <br /> <br />An overflow on lands <br />that are used or usable by man. <br />istics: The inundation of land is <br />to and Inundated by overflow from <br /> <br />not normally covered by water and <br /> <br /> <br />Floods have two essential character- <br /> <br /> <br />temporary; and the land Is adjacent <br /> <br /> <br />a river or stream or an ocean, lake <br /> <br />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, use <br />of groung water coincident with Increased stream flow, and other <br />problems. <br /> <br />'f-""-<' <br /> <br />~~i~; <br />-~~~...." <br />'-.....-~......... <br />'/ff'i" <br />~-;j~: <br />t*\\{ <br />rt,... <br />~{,. <br /> <br />rK..............:;.... <br />~r". <br />fuf:....""..:....:.. <br />"'."~'" <br /> <br />,~t.;.:;,.'.:, <br />~{;:_:-. <br />,~~:_;- <br />~". <br />~~.,<'.:.. <br />y...-,:..j..-~. <br />'l=f'. <br /> <br />l~.:.'.'..: <br />rRr:--' <br />.~6~, <br /> <br />Flood Crest <br /> <br />The maximum stage or elevation reached by the waters of <br />a flood at a given location. <br /> <br />Flood Plain <br /> <br />The relatively flat area or low lands adjoining the <br /> <br /> <br />channel of a river, stream or water course or ocean, lake or other <br /> <br />body of standing water, which has been or may be covered by flood <br /> <br /> <br />water. <br /> <br />,.'-. <br />;~--'-'. <br /> <br />~y-, <br /> <br /> <br />, . <br />.~i,~.:_:_'~ <br />I', <br />~~!:::-.' <br />~1~r-. <br />;<:"-" <br />DY. <br />t&( <br />.:~t :' <br /> <br />17 <br /> <br />Flood Prof i Ie <br />A graph showing the relationship of water surface <br />elevation 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 time <br />or stage. <br /> <br />Flood Stage <br /> <br />The stage or elevation at which overflow of the natural <br />banks of a stream or body of water begins in the reach or area in <br />which the elevation is measured. <br /> <br />Head Loss <br /> <br />The effect of obstructions, such as narrow bridge open- <br />Ings or bui Idings that limit the area through which water must flow, <br />raising the surface of the water upstream from the obstruction. <br /> <br />Intermediate Regional Flood <br />A flood having a one percent probabi lity of occurrence <br />in any year of an average frequency of occurrence In the order of <br />once in 100 years. The flood may occur in any year. It is based <br />on statistical analysis of stream flow records and analyses of <br />rainfal I and runoff characteristics In the general region of the <br />watershed . <br /> <br />Left Bank <br /> <br />The bank on the left side of a river, stream or water <br />course, locking downstream. <br /> <br />Right Bank <br /> <br />The bank on the right side of a river, stream or water <br />course, looking downstream. <br /> <br />18 <br /> <br />