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<br />I:;LOSSARY OF TERr1S <br /> <br />Th'e hor I zonta I angu I ar measurement of <br /> <br /> <br />east or west of a north-south reference line. <br /> <br />a line, fn-"deCirees, <br /> <br />Flood Profi Ie <br />A graph showinCi the relationship of water surface elevation <br />to location, the latter Cieneral Iy expressed as distance above mouth for <br />a stream of water f I owi ng in an open channe I. I t. Is nenera II y .drawn to <br />show surface elevation for the crest of a specific flood, but may be <br />prepared for conditions at a (liven time or staCie. <br /> <br />Bear I n'l <br />, <br /> <br />Flood <br /> <br />An overflow on lands not normally covered by water and that <br />are used or usable by man. Floods have two essential characteristics: <br />The inundation of land Is temporary; and the land is adjacent to and <br />inundated hy overflow frOM a river or stream or an ocean, lake or other <br />body of standlno water. <br /> <br />Flood Staqe <br />The stage or elevation at which overflow of the natural hanks <br />of a streaM or body of water be'llns in the reach or area in which the <br />elevation .is measured.- <br /> <br />'.forma II Y a flood is cons i dered as any temporary rise in stream- <br />flow or stage, but not the pondinn of surface water, that results in <br />significant adverse effects in the vicinity. Adverse effects may include <br />damages frOM overflow of land areas, temporary backwater effects in sewers <br />and local drainage channels, creation of unsanitary conditions or other <br />unfavorable situations by deposition of Materials in streaM channels <br />durinn flood recessions, use of 'lround water coincident with increased <br />streamflow, and other problems. <br /> <br />lIeild Loss <br /> <br />The effect of obstructions, such as narrow bridge openings or <br />buildings that I imit the area through which water must flow, raising the <br />surface of the wilter upstream from the obstruction. <br /> <br />Flood r.rest <br />The Maximum stane or elevation reached hy the waters of i'l <br />flood i'lt a niven location. <br /> <br />Intermediate Renlonal Flood <br />A flood havin'l a one percent orobabllity of occurrence in any <br />year or an average frequency of occurrence in the order of once in 100 <br />yei'lrs. The flood may occur In any year. It is based on statistical <br />analysis of streamflow records and i'lnalyses of ralnfi'll I and runoff <br />characteristics in the (leneral region of the watershed. <br /> <br />Left Rank <br /> <br />Flood Plain <br />The reli'ltivelv flat area or lowli'lnds adjoininn the channel <br />of a river, stream or water course or ocean, lake or other body of <br />standing wi'lter, which has been or mi'lY be covered by floodwater. <br /> <br />The bi'lnk on the left side of a river, stream or water course, <br />looklnn downstream. <br /> <br />Reference Point <br />A numbered point identifying a specific location for correlating <br />the data shown in various forms throughout the report. <br /> <br />33 <br /> <br />34 <br />