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<br />FlITURE FLOODS <br /> <br />Only in rare instances has a stream experienced the lar- <br />gest flood possible. Severe as the ma><Un\lll\ known flood may h<1'lc <br />been en a given stream, it is generally accepted that a larger <br />flood will occur. Larger floods have been experienced on streams <br />with s.Unitar geographical and physiographical characteristics as <br />the cuehar..s ll.iver. Severe storms will undoubtedly cccur in the <br />cueharas watershed to cause future floods that .",il1 surpass known <br />histeric floods. Discussien ef future floods in this report is <br />limited primarily to those that have be~n designated as the 100- <br />year flood and SOO-year f1cod, however, 10-year and 50_year flood <br /> <br />data aro presented. <br /> <br />Definitiens of these future floods arC found <br /> <br />in the Glossary of TerTIUI sectien of this ""'l'Ort. <br /> <br />Flood Maqnitude and Their ~requencies <br />Standard hydrelogic and hydraulic methods were used to <br />determinethemagnitudecfflccd"efth..seiectedretu.-nfre'luen- <br /> <br />oics. <br /> <br />Hydrelogy data was develeped f~orn the r..sults of ~ f~nquency <br /> <br />analy"i~. ,.lew f~equ..noy pa.~illl\ot.,~s were duvelcped f~em "Manual for <br />Estimating ~lood Cha~acte~istics of Natural-Flew Streams in Oole- <br /> <br />r"de." P""k dischargesef the 10-. 50-, 100-, and 500-yedr flcodS <br />at selected locatiens along the CUcharas River are listed in Table <br />2. Floods largcr than thc SOa-year flood are possible, but the CQm- <br />bin<ltlon ef facters necos"llrr to produce such larg<, flowH would '''' <br />""eremely rare. The Corps ef Engiu"..rs' IIEC.l "~C1I'-Il/lekwc,~"r """'- <br />puter pro<j~am was u.."d to develop tho flooded "redS and flood l,roIi 1,'n. <br />TheloO_yearfr<lquenoyfleodisdefined<ls<,floudhavin\l <br />an average frequency ef occurrence en the erder ot once in 100 years <br />at ad""ignatoo 1ccation, although it may eccur in <lnyyeilr andpos- <br /> <br />sibly in successive years. <br /> <br />It canbc "-,,pressed in tennsofpercen- <br /> <br />tag" to aveid the possible inference ef regularity of occurrence. <br />Thus, a floud with a 100-y~r recurrence interval would have" en<' <br /> <br />H <br /> <br />N <br /> <br />" <br />~ <br />U <br />" <br />:1 ~ <br />~ " <br />~ <br />01 <br />u, <br /> <br />~ <br />" <br /> <br />" <br />" <br />~ <br />" <br />~ <br />" <br />. <br /> <br />" <br />, <br />, <br />, <br />. <br />, <br />, <br /> <br />, <br />. <br />. <br />. <br />, <br />., <br />~ <br />, <br /> <br />. <br /> <br />J ~ <br /> <br /> <br />. 1- <br />, ' <br />",,,,... <br />" , <br />. , ' <br />. <I' <br />, . <br />00 - <br /> <br />~ <br /> <br />~ <br /> <br />~ <br /> <br />" <br />., <br />, <br />. <br />, <br />3 <br /> <br />., <br />.00 <br />~~ <br />. <br />" <br />,. <br />> <br />'.1s <br />., <br />'<0 <br />.~ <br />2" <br />H <br />,. <br />U <br /> <br />, <br />, <br />, <br />" <br /> <br />o <br />o <br />. <br />, <br />. <br /> <br />00 <br />o <br />, <br />. <br />N <br /> <br />o <br />00 <br />N <br />. <br />N <br /> <br />00 <br />00 <br />00 <br />, <br />. <br /> <br />" <br />" <br /> <br />" <br />00 <br />N <br /> <br />o <br />., <br />. <br />~~ <br />. <br />~I ~ <br />ON <br />, <br />q <br />" <br />:l <br />p <br />" <br />8 . <br /> <br />00 <br />o <br />, <br /> <br />, <br /> <br />. <br />. <br /> <br />o <br />00 <br />. <br /> <br />. <br />" <br /> <br />00 <br />o <br />, <br />. <br />. <br /> <br />o <br />o <br />N <br />. <br /> <br />" <br />N <br />N <br />N <br />N <br /> <br />o <br />., <br />. <br />~8 <br />i6 <br />> <br />" 0 <br />.S <br />., <br />~l <br />2" <br />. . <br />a . <br /> <br />u <br /> <br />00 <br />00 <br />N <br /> <br />00 <br />. <br /> <br />8 <br />" <br />" <br />" <br /> <br />00 <br />o <br />o <br />. <br />. <br /> <br />00 <br />00 <br />" <br />. <br /> <br />. <br />o <br />. <br />" <br />" <br /> <br />o <br />ON <br />.~ ;!; <br />~" <br />o <br />~.s <br />" <br />~l <br />" <br />l, <br />S' <br /> <br />00 <br />00 <br />N <br />" <br />N <br /> <br />00 <br />. <br />" <br />" <br /> <br />00 <br />o <br />" <br /> <br />00 <br />00 <br />" <br /> <br />, <br /> <br />N <br />N <br /> <br />00 <br />00 <br />N <br />" <br /> <br />00 <br />" <br />" <br /> <br />00 <br />00 <br />" <br />" <br /> <br />00 <br />. <br /> <br />00 <br />00 <br />. <br />" <br /> <br />" <br />. <br />00 <br /> <br />L <br />.. <br />'0 <br />N <br />-- <br />" <br />, <br />'5 ~ <br />'8 <br />~] <br />NN <br />. , <br />< <br />