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<br />FlOOD S'rAGE <br /> <br />The stage or elevation at "..hieh ov.Hflow of t,,€ r1~tural banKS of <br /> <br />a stream or ~ody of water begins in t"e reach or area in which the <br /> <br />d'!vation is me~sure<l. <br /> <br />,'LOOD'/IIAY ZO~E <br /> <br />The chdnnel of a stream and thos", portions of the adjoining <br /> <br />floodpldin which are reasonably required to carry i1nd diScharge the <br /> <br />floodwaters of a 100-year flood. <br /> <br />It is the designated floodplain less <br /> <br />the low haZard zone, if any such low hazard Zane has been identified. <br /> <br />If no low hazard zone has been identified, then the terms "design<lted <br /> <br />floodplain" <br /> <br />'"' <br /> <br />"floodway <br /> <br />zone" <br /> <br />shall <br /> <br />be conSidered <br /> <br />,1S being <br /> <br />::;ynonymous. <br /> <br />INTER~EDIATE REGIONAL FLOOD <br /> <br />A type of flood, including the water r;urfacE' <llevation alld <br /> <br />territorial occupation ther"of, which can b<; expected to occur at any <br />time in a given areil based upon recorded hb.torical precipitation and <br /> <br />:> t!~ c r ...,J 1 ::: d:l t.1, .':; Cl t '" i ttJ '" n a" e! d'.J e S L d l i " l i c "L 0 Il" pe < C en t c h <I nc e <br /> <br />of being equalled or exceedeG during anyone year. The term is used <br /> <br />interchangeably wit" ~ one percent or l~~-year flood. <br /> <br />(Seedcfinition <br /> <br />fo r 1 ~~-ye<l r flood.) <br /> <br />L81,' ::AZA,,;) ZCi><:S <br /> <br />That area of the floodplain in which the waters of a 10~-year <br />flow "ill not attain a maximum depth gre.'lter th<ln one IInd one-half <br /> <br />feet. <br /> <br />'5 <br /> <br />PROBABILITY <br /> <br />The annual chance of occurrence of specific hydrologic events, <br /> <br />such as rainfall oVer a specific area or peakdischaqe ata specific <br /> <br />l.ocdtion expressed in percent, e.g., 5% representing nnechance in 20 <br /> <br />of tile event occurring in any year or an average recurrence of once in <br /> <br />twenty years. <br /> <br />REFEHEJ>;CE POINT <br /> <br />A number\ld point identifying a specific location for correlating <br /> <br />the data shown in various forms throughout the report. <br /> <br />RUNOFF <br /> <br />The quantity of rainfall which flows over the surface to enter <br /> <br />the stream as discharge volume. The difference in quantity between <br /> <br />rainfall <br /> <br />'"' <br /> <br />runoff <br /> <br />losses <br /> <br />" <br /> <br />infiltration and <br /> <br />represents <br /> <br />, <br />I <br />I <br />I <br />, <br /> <br />interception. <br /> <br />STHEAI". <br /> <br />MIl n<lt;;ral c:~,annQl or depression throuqh ,,'11 lct, ...ater fl,,,,,s <br /> <br />either continuously, intermittently, or p.![iodically inducing any <br /> <br /><lrtificial rnodificationof the natural channel or depression. <br /> <br />STREAM RE"CH <br /> <br />A :;egr,,,,,,~ of s~re<lm defined between two speci tic points. <br /> <br />WATO:RSHED <br /> <br />The drainag<l> arca situ.1ted ilbove a speci fieri point on oJ stream <br /> <br />lncludi~g the area drai~ed hy tributary streams which enter the main <br /> <br />strealL\ above this point. <br /> <br />26 <br />