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<br />, <br /> <br />FUTLJflE FLoolJS <br /> <br /> <br />I ~ ardor ~o study the t lood potentia I on ~t. Vra i n Creek, <br />t'''o'lood5,the InTcr"'ediatoR()gional aM Stand"rd Projcc:t Floods <br />..ere develored. The I nter",od lilt" Reg ;,'"" I ~IOO<J is One '.'ith ~n <br />uvcrdqe freq~ency of occurr~nco aT aCo"t once in 1'80 yeclrs Jne is <br />i ocr..,,,s ingly ~ei ng accepted lJy the D'J~II<; as d r;,jnimum I imi t tor <br />"ppliCJtionof local rClgul<ltlons. Thc$tilndardProjectFloo:J is <br />at gredter magnitudo and represents il re~soMblo urper li",it at <br />expected flooding. <br /> <br />3 <br /> <br />-- <br /> <br />Intermediate Regional FlOOd <br />The d I~charqa-trcq~cncy relat ions~ip" in tli" St. '.Jra in <br />Cr<lC!k bas i n were based On a sTa t i st lea I iln~ I vs i 5 01 ~he stroam <br />;pg i ng records of SI. Vr~ I n Creck ~t Lyons and Plattevi lie, <br />Colorado. Flo<Jd hydrographs were d"v"lo~ed to~ ~out-ing th~ou"h <br />Guttan Rock,Oam"rnJ for routir>q downstrcU'l' Ira" Lyons tooetermine <br />~ho di ,ct>drgos througl;.:;~t till; I"nsth of t-he str~dm. Tabl e ~ shows <br />tho Intc~mediate R~ionBl Flood Jlsch~rges a! specific locatinn, <br />~ 10"'] trle strf>"r'l. <br /> <br />Figure II. <br /> <br />Flooded I~rmland noar Lo~mont - St. Vr~in C~eok, <br />9 M~y 1957 <br /> <br /> <br />StandJra Proj~t FlOOd <br /> <br />Tll~ S t-:onJJrd f'roj set r i ood i 5 O~<l"",,,~,,J i" I h i 5 rerod <br /> <br />~"tho rra~tic~1 upper li",it of floodiM. StOr'1S that would pnxluce <br />Illi~ 'Iooj "re ury~OI'I'II"'On, aM it is :l iH icult ro assign frequencies <br />01 (Y.;~urr","ce "ith any r,,,,sond[; 10 degree of accuracy. i!owf)vcr, <br />flooJ5 of tnis $ize Jo OCcur a5 ovidence~ by floodi~g in the ~enYe~ <br />~rc" in 19b~'. TClbl1' 4 ~hQW~ the Standard P~oj"c~ rl"oJ discMrges <br />at certai~ loc~tion~ on ~~e. ST~e~n5. <br /> <br />Fi'Juro 12. <br /> <br />Upst~~am f~~ U. S. Kig~wJy 287 at Lo~mont <br />St. Vr~in C~ee~, 9 ~~V 19~7 <br /> <br />" <br /> <br />" <br />