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<br />GLOSSAfl.Y Of I'ER~S <br /> <br />Flood Plain - Th€ rel~tjvely flat or low tnnd ~rea adjoining a river, <br /> <br />Hream, <br /> <br />water~oune lake or other hody of standinp: "'!Iter which has <br />. , <br /> <br />Channel - A n"tural or &rtiHd,,1 '",nt"~ cou~se of perceptible extent wah <br /> <br />heen or may be ~ov~red tel\lporarily by n""d ,mt..r. Fcr administrative <br />pl1rp<l,"e~ ~hp. flood p\"in may be defined ,," th .Hell that would be <br /> <br /><\efinlte hllnk~ to confine ~nd conrluct conUnl1ously or l><'d,,<li~ally <br /> <br />tnu"rlat..rl hy tlw 100-y",", flood. <br /> <br />f1o"'ln~ water. Channel flo'.' Is that "'at"r "hieh is flo"'i"~ ,.,ithlo the <br /> <br />limits of the defined channel. <br /> <br />Perched Channel Flow - A condition ",here the flow elevlltion in the out~t <br /> <br />portions of ~he nocd dllin is I,ii>:het than the now elevation In tl,e <br /> <br />Flood - W"ter from a ri"~r, str..a"" "'a~er cour~e, lake or ath,'r lx>dv of <br /> <br />",alnchannel. Thi"conditinnoc_cura"'henahii>:hHseCorldatychann"l <br /> <br />standing "'ater, thac temporarily ov..rflo"'s t~ houndaries witl,in w~1ch <br /> <br />rece1"e" infIo", from so",,, location upstream "nd rnaintain$ a flatter <br /> <br />it i~ ordinarily ccnHnerl. <br /> <br />slope chan ch.. mAin channel. <br /> <br />FloodCrest-Therna.x1m"mstaf:e or elevation re"ched hy the w"ters ofa <br /> <br />flood at a given location. <br /> <br />fl.each - A hydraulic engineering term used to de"cr1be IO"i>:1tudin1l1 ae~ent. <br /> <br />ofa strea", Of rtver. <br /> <br />Flood Frequency -Arne"ns of e"pfeasinp; the probabilitv of fl""rl OcCunenc.e" <br />as determined fr"", a statiatical analysis cf representative streamflo'" <br /> <br />Runoff - Tha~ pan of pre"-ipitatlofl, as well lIS any other flow contrtbl1- <br /> <br />tions, which app"ars in surface ~trea.olS of either perennial or <br /> <br />or rdnfall and runoff recorda. The frequenc_y of a pani~l1hr S~ai>:e or <br /> <br />intermittent form. <br /> <br />diaeharp;e io uSl1ally eKpresaed as oc~urrinF: once in a specified number <br /> <br />SUeam - Any natural channel Or <lepre"sion throui>:h ",htch Water flows whether <br /> <br />of y""ra. t'hp 10-, 15-, 50-, 100- Itnrl SOn-year frequenr:y "loo<l~ h.'v" <br /> <br />concinl1cusly, intermittently, or periodically, including modificaticn <br /> <br />,,~ 9v"r"e.. f!e'l""""'y '>f occurrcnce in th" n"!,,r of once in tt,e nUTIl~er <br /> <br />of th.. ""tur,,] rh"nn..] or rl~rl"..~~i"n. <br /> <br />of year a as indicated. <br /> <br />Structure <br /> <br />Anything ,,-onstructerl 0,. erpt:ted, the us~ of which raquires ~ <br /> <br />10-YearFlood <br /> <br />A f1oodhav1nr, an IIverai>:e frequency of occurrence of One", tn <br /> <br />more or less permanent location on or in the ~rollnd. Includes l'>\lt i~ <br /> <br />lD yea.~. Tt hag 'I 10 percent ~hance of being e'1.']al<'<1 or exceeded in <br /> <br />not limited to bt1dge~, hI]Udlnl(~, can"l~, dama, ditch..", diver"!ons, <br /> <br />anYJ>:iv..,ny..,ar. <br /> <br />IOo-Y",ar Flood - .~ flcnd h.wln!' nn "vera!!" frequency of O"CnrrenC~ of "nce <br /> <br />Irdgation .,y.tP",,,, pump" plpt'1ines. railroads, ro"ds, ~ew.''1'" disposal <br /> <br />i" 100 'f~..r". It has a 1 percent challce of bei<\? <''111a1<><1 or e~~eeded <br /> <br />cyst..",". ,,~<!erfirom,d c""ddt", '.'~~cr ~upp:,. syat~"'s ,..." .,~ll~. <br /> <br />lna"yl(ivenvear. <br /> <br />Typical Valley Cross S~ction - An ~nl(ln~ering <lrnwlng or a vertl,,-al section <br />tlfa atrea", "I,an"el ,'ndlld.101nini11andscape'',,vie,,,ed 1nadownstr edm <br /> <br />Flood Hazard Ar~n" - ~,ea9 susceptible to flood d~~~p'p. <br /> <br /><lir~"t-(on. The dr8Wing r..pr,,"pnt." " ~~ec.i tfe<l ll>c3tlcn wi thin ~ <br /> <br />Flood Peak - Thc hi~heH stal(e M discb,ul1e attained <lLLdn!,; a flcI>d e.'''''t; <br /> <br /><le"II1""tcd "trt'~:'l r",1~h. <br /> <br />ill So rd~H"d to .~.q I'e"k <;tn1~ I>r p,,;lk .H""hn,,~~. <br /> <br />18 <br /> <br />18 <br />