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<br />GLOSSARYDFTERMS <br /> <br />Flood. An overflo~ of londe, not nor~81ly covered by water, that <br />ar~ u~od or uooblo ~y myn. Floodo have t~o oeoontiol charaoter- <br />istics: the inundation of land is temporary; and ths land i8 <br />adjacent to and inundated by ~yerflcw from a riv~r Or etr~~m, nr <br />an ocean, laka, or other body of standing water. <br />Normally,a"flood"iscort$ideradaa8nytarnporary <br />rlselnstreamfloworstege,butrlotthapondingofsurfacewater, <br />that resulte in eigrtifioant adversa effscte in the vicinity. Ad- <br />veree effects may include damages from overflow of lend areas, <br />temporary backwater effects in sewere and local drainage channele, <br />creation of une~nltary oonditione or other unfavorable situationo <br />by d8poeition of materials in etream channels during flooo recos- <br />aions, rise of ground water coinoident with inoreasad streamflow, <br />and other problem~. <br />Flood Crest. Th~ maximum stage or elevation .aached by the waters <br />of a flood at "givsn location. <br />Flocd Pe~k. The maximum in~tantaneous disch8rge of e flood ut U <br />glv<lnl(lcation. ltueuallyocc:urs..tornearthetimecrth" <br />flood "l'~st. <br />Fl"n!"1 PlAin. The reL,Uvtlly flat area or lowlandS ~djoining tha <br />channal of a rlV<lr, 9tr~~m or w~tBrcourge, or oc"en, lak6, or <br />other body of etanding watar, which has been or m~y be covared <br />by floodumtet. <br />Flood Ptofil",. A gt"~ph !!holl/in9 thR r<tl"Uonship. of ""'Iter surface <br />el9vation to location, tha latter ganetally tlxpttlRsed aa distance <br />above Inouth fo. a ~tre",m of water flowing in an open Channel. <br />It i~ gensr~11y dr..wn to show sUrfac~ elev~tion for the crs8t of <br />a spacific flood, but may ba preparad for conditions at a given <br />timsorstags. <br />Flond 5b~~. Th8 "b'gs o~ elevetion ~t which overfIolO of t~.. <br />n~tural banks of a strs~m or body of water bp.gin" in thA rench <br />or area in whlch tne ~l~vation is me~~urea. <br /> <br />Hs~d Lose. The ~frect of obetructionc. such ~a narrow bridge <br />opanlng~ or builrlln~R th"t limit ths or~a tbr~ugh which ~ater <br />must flow, rai~ing the surface of the water upatr~am from th~ <br />ob~truction. <br />Intermediat~ Reoio~al flood. A flood having an avorage frsquency <br />of occurr~nce in the order of once in 100 years 81t~~'9h the flood <br />may occur in any year. It is baaed o~ statistical analyses of <br />$;reamflo~ rec:crda available for the w~tershed and analyaes of <br />rllinfall and runoff characteristioe in the "gener~l 'region of the <br /> <br />..atarshed." <br /> <br />L~ft or Rieht isaHk. Ins i.J",,~ ::-0 the Ian n~ rioht side of a river, <br />atream, or ~atercourea, looking downetream. <br />Standard Pro!~c~ Flood. The flcod that may be e~pected from ths <br />moet sovera combination of meteorological and hydrological ccn. <br />ditiona that ie con8ider~d raason~bly characteristic of the g60. <br />graphlc:al araa In ~hlch the drainago b"aln is located, ~xcluding <br />extremely rare co~bin..tiono_ Peak dlcchargos fer these floods are <br />g~nerally about MJ,( to 60% of the p.obable maxim"'" Floods fOr the <br />!ISmO ba.ains. Such floods, M Cls"1 by th~ Corp8 of Engineers, are <br />inta~d..d as practic"bl~ axpre.."iona of the "'..gl'"'' of protection <br />th"t should be sought in tho de<llgn of flood conhol ~orks, the <br />failure of which might ba disestrcuB. <br />Undo.olearance. The lowest point of a bridg~ or other atructure <br />over or ecrOSS .. river, stream, or ~atercours~ that limit~ the <br />cpening through ~hich ~at~r fl,,~s. This io r~ferr"d to ~8 "10" <br />ste~l" in aome regions. <br /> <br />'" <br /> <br />" <br />