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<br />28 <br /> <br />" <br /> <br />To locate the edge of the floodplain by simple scaling methods, measure the <br />distanc.., On the map from two or more pny,teal feature, that can be identified <br />wtn on the "'lp and in the field to the edge of the floodphin. The fload- <br />pl..1n \imltsc<w bce'tabllshed by layingollt theme,1Sureddistance5 inthe <br />field. <br /> <br />GLOSSARY <br /> <br />th" <br /> <br />Ba,;n. <br />s"rface <br /> <br />An enclosed or <br />of the earth. <br /> <br />partly enclosed water area or depre,slon on <br /> <br />Designated floodplain. <br />action (the board of county <br />concurrence of the Colorado <br /> <br />The area designated ilS a floodplain by official <br />commissioner, or city council) with the prior <br />~ater Conservation Board. <br /> <br />As explained in the paragraph, describing the flooded areaS there are por- <br />tionsofthef\oodplain in the lowerpartofthcreachandal.oattheuppec <br />end of the ceach whiCh are subject to shallow flooding caused by upstream <br />conditions. Thus, flooding In these areas cannot be verified by thetradl' <br />tion"lmethodsdescrlbedabove. These special areaS were delineated by <br />special "naly,is. <br /> <br />flood. A temporary ri.e In the water level of stream or basin that <br />results In inundation of overflow areas not usually coveredbywatec. <br />100-year flood Is a flood with a peak flow magnitude that has a 1 p~ccent <br />chance of being equalled or exceeded in any given year and a frequency of <br />occurence of about 1 In 100 years on the long-term average. <br /> <br />floodfcequency. The average frequency, statistically determined, <br />for which a specific flood flaw ~gnitude ~1y be equalled or e~ceeded. <br />frequency. expressed as an occurrenCe within" specified number of years. <br />I, the equivalent of the recurrence Interval which " the average time <br />Intecval betwe~n actual occurrences of a flood event of a given or greater <br />II,aynitudeofflow. <br /> <br />Flood profile. A graph or a plottlngofw...ter.urfaceelevation,of <br />a ,peel fie flood frequency of a .tream or basin. <br /> <br />Flood protect Ion level. A levo I wh Ich i. ".tab\ I~hed aoove the 100- <br />year flood elev~tion for regulating U5e$ In high hazard ~reas. <br /> <br />Floodplain (general deflnl t Ion). An ~rea along ~nd Adjacent to a <br />stream or basin which 15 subject to flooding. <br /> <br />F\ooaoldln (reoulalorydeflnltlonl. An area Inandadiacentto,) <br />Hre<'m. which ~rea I, ,ubject to floodIng as the res....lt of the occurrenCe <br />of ...n inl~rmediat~ r~glonnl flood and which area thu, Is so adverse to past, <br />current,orforeseeableconstructlonoc landusea.toconstltuteaslgnifl- <br />C~"t hJzMd to public health and safety or to property. <br /> <br />Intermediate nglonal flood. A type of flood, Including the water <br />.lJ' f~ce eleVAtIon and tNritorl..l occupdtlon thereof which can be e",pected <br />t"occurat,'nytim<'in.1givenareabase,duponrecordodhlstorlcalpreci- <br />pitatlon .md other valid data. but with an average statistical 1 percent <br />,'h;'n<:~ of hel",! e~u"ll~~ oc "'ce,,~~~ ~uri"g ""y 1 y""c. Th.. term is ".,.~ <br />inlerchanq".,blywltha 1 percent flood or 100-yearfloud. <br /> <br />Luwh"><<lrd<one. Th.Jt area of the designated floudplaln in which the <br />w.>ter< of an i ntermed laIc region~ I (IOO-year) flood wi II nOt ana In., ma",imum <br />depth Qre"ter than I foot, or have vC\<>eltles e,",cecding 3 feet per second. <br />