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<br />fl~od Plain - The relatively flat or low land arca adjoinln~ a river, <br />stream, watercourse, lake, "r other body of standin~ water which hag <br />been or may be covered temporarily by flood water. For ^dministrative <br />pllrposes the flood plain may be defined as thearca that Io'Ould be <br />inundated by the IOO-year flood. <br />Perched Cbannel Flow - A condition where the flow elevation in the outer <br />portions of th.. nood plain is hlgher than the flowelcvation in the <br />","in channel. This conditi<m occurs "hen a higher secondary channel <br />receives inflow from some locatIon upstream and maintains a flatter <br />slope than the maIn Channel. <br />Reaeh-A hydraulic engineering term used to describe long1tlldin alsegments <br />of a stream or river. <br />Runuff _ That part of orecipitation. as well as a"y oth..r now (;<,ntribu- <br />tions, which appears in surface streams of either perennial or <br />lnte~ittent form. <br /> <br />Water Surface Profile - (This term is synonymous .'Hh P100d Profile) - a <br />~raph showlng the relati<.>nship of the water surface elevation of a <br />flood event to location alon~ a stream or river. <br /> <br />Watershed. <br /> <br />A drainage baSin or area which collects ronoff and transm1t~ lt <br /> <br />usually bvme.1ns of strea",sand trihutaries to the outlet of the <br />basin. <br /> <br />Str""1I1 - Any natur"l channel or depress loa throo~h which water flow" whether <br />continuc'usly, inr~:rmitt~"tly. or p..rtodt~ally, lncl"dinp: ",,>dffl,"tfon <br />of the "at ural channel or depr<'sslo". <br /> <br />Structure <br /> <br />Anythin~ conatruct<>d or e..'ct~d, the u.e of >/hlch .requires a <br /> <br />more or less permanent 'location on or in th" ground. Includes but is <br />n"tlimitedtob..tdgell, b\Jildinga,canals,dams,dltche.s,dlvera1on., <br />lrrignti"n system". pump", plpdlnes, railroads, roads, sClo'''~e dlaposal <br />"ysterns, "nder.<;round conduits, water supply "y~tem~ ;\nd \oI",lIs. <br />Typlc.al\'alleyCro."sSecU""-A"e"glo"erinl'dr31o'lngof3vertlcaleeetlo" <br />lOt a stream ch""n..l and adj()inin~ land.cap" ,," vi"Wf'd In " do,",nstr~<"" <br />direction. l11~ ~r"wi,,~ r~rr~qent, ~ ~p~dfj~~ l"~MI"n within" <br />,:"dgnated sU"Mn "",,-ch. <br /> <br />" <br /> <br />" <br />