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usivarzvua iu:st rna susoozarar ~nr curvau~inrvl.a true ~u1a <br />_` ) <br />r <br />• <br />Mlla:rsrrr.t i~l: rr.~:~rr„ <br /> <br />• I'hr I~fph hatarJ r.rling anJ laenaral cuuJitia,n oC rlinna•sut,r Daw )rd,•.. <br />burn of. concern to the Forest Service Car some t:Lnce. Tha 500 nc•r:° <br />f,•. r of nr++r.~d wat.•r. wus ronridcrrJ {+otentlai ly Janpurous, <br />,+ cla.rr weather hraacch analysis was prerareJ fur this Jam u~[up. <br />thr NO A Dam Rt•aak prorrtm with an ut:sumc.l I hour Clone of hre:u•h <br />drealopment. 9'he breach flow tans routaJ Jut:nsr rerun using ccuss <br />r•.:ctGnts rrepareJ from USGS 1:26011 scale ;0-Co,.,t cuutour Intrrva] <br />t :y•uYrarhic maps. Ikiusa and hullJinyt locations :urd elevations <br />.•+~ir,r also determined from Chi: toroy.raphic mars. <br />'the ra+snltlnY flood stapes .rnJ yuantitlos aro .+I+pror:lma Ca v,tlurs <br />b:iscd nn dam inventory Beta, tupnr,rarhi+~ mgrs, rtnd resource <br />1•h~+tnrraphy, The hazard rating of the dam anJ lnrtential Cntal <br />inundatJnn dama!?a are raasnnably accurate. inJlvtdu~l horse ur <br />other structure damalre can ba better rradicta•t by using Wore <br />acr.r.rraCa data Rat•hared at L'he site. <br />7'ha clear weathrr breath of tlinnesuCa T):un rruJuc~d a ealculat~J <br />i•aa4 flow at the dam of 10,280 cfs. 9'f,e peal: E1nta was reduced <br />Cn R,230 cEs by the time Lt ra~ache.l the r:routh ol'• Minnc~,ota Cre~•I:, <br />at the Nurt.h Park of the Gunnison River in Patrula, 9.8 miles <br />drn:nstrdaur, The cumput:ad overhank flooJlnh Ja~ptits vary from <br />0.7 feeC. to 3.5 feet Ln the lower 6 roils of Ilinna?sota [:reek, tl+s+l <br />r:rnlaLn road crossings and Bul.ldlntta, I•Ive )+.r,rva:i [oaJ cr•nssinFs <br />• ::Ill sust.aln damage, up Co comrleCe Eallure. rcrhaps four houses; <br />:.-Ill sustain shallow flondinl; but loss of tiCo 15 not expected. <br />Thcs,a houses will exp~•rienca water d:un,iFa np lu el.ructural <br />col I,tl+tie, dependlug on th<• distance from the str<+eur, and sCre:un <br />nn+:•rrnrnt Jue Co erosion. Comrutad flood v~lucitias wLthln the <br />.I. rearm channol cangad from 62 fact r.•r saco:ra J:irnt Cu 1 7 Eee[. pi•r <br />,round. .The yunntLty and velocity of flood wafers.are asrectad t... <br />t•arl Sra ea<L,?r151 Vi' ernSinn anJ re6uUr'l:e Jame@e alonlt t)i nneso to Cn:ok <br />nn.l rr+.that+ly deposit a seJim~~nt her in the fnrutisun River. <br />'llrls rvyluation «f the clear weatha+r hr~arh ire.liuatzs that the <br />failure of Minnesota Reservoir would rruhahly not cause loss of life <br />or ewcesslve rrivatc or puhlic property d3wag+:. IE a~fleld check of <br />the flood rain snprurts the flnJines of this reporl•, the hazard <br />+~IayaiElcatiun of Minnesota Reservoir will ha r.~Jucaad to modarat~. <br />l'he clear ww:athrr Breach aE tiinnesata Reservoir a~tll: <br />1. Cause resource damaka alonit 9.8 miles of Iflnnesota Creel:. <br />i. Ovmaga five Pravel road cr•usstngs, prul~,thly cumrlaCely <br />Braachinl? the roads, <br />'!, Yrubably cat road ar.eess to 20 Iramrs. <br />4. Uumttp,u 0 Gn 6 hnusun; Ililltl~ mrly .tvortl'n++lly cnllal+sa Frut+r <br />• erunlnn of tl+r•Ir founJ,tCluu:;. <br />