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<br />to O::l<;S the <br /> <br />n <br /> <br />the <br /> <br />'"tin':. the <br /> <br />.:Jns in the <br /> <br />t 30 miles <br /> <br />dam crest, <br /> <br />:ombination <br /> <br />)9 prepared <br /> <br />National <br /> <br />3. selected <br /> <br />~'- a public <br /> <br />11 laws and <br /> <br />2 .medif led <br /> <br />?rojec~ ~ <br /> <br />ek is <br /> <br />SY!.l..ABUS <br /> <br />A seudy was inieiaeed under ~he CClr'pS of Enginee:,s' Dam SafecI Assurance <br />?=og=a.c c.o dec8r::1ine if c.he Cher=r C~eek La.ke proj e!e~ should :,e :JJod~::.ed ::0 <br />resolve ehe hydrologic deficiency. <br /> <br />The Cherry Creek Lake proj ece "as auehcll:l.zed by e,l1e Flood Conerol Aces of <br /> <br />1941 and 1944. Conse=ceion 'Jas complee:ed ;.::\ 1950. l'he projec: con.sises of an <br /> <br />ear:hfill embanlc:lene wieh ouelee works loc:,aced on Cher:"! Creek 'loucheas: of <br /> <br />Den"er. Colorado, The Sllillw",y joins :he Che,::c::y Creek b,a.sin co :he adj acene ,011 <br /> <br />COlee a.nd. Sa.nd C::eek basi:ts. The proj ec: is lac:.aced abou.t: 1.2 miles ups::::-eam :=am <br /> <br />:~e confluence of Che::'=y Creek wich roe S()Ue:l ?lat:t:e River and ~:ont:=ols 385 <br /> <br />square miles of :he 410 square mile Cherry Creek basin. <br /> <br />COr?S dams loc.a.ceci above ?opula::ed are.a~.'5 are designed ::0 s:::lre and-;lor ?ass <br />a Probable Maximum flood (?!'.F) wiehoue over~.opping :he embanlc:lene. The P!iF is <br />es:::imaced using probable 1llaXi= precipice.cion esc:i;:ua,ees developed by che <br />~ac.iona.l ~eatiter Service. The mos~ ::'ecenc pre:ci.?ii:acion as-c:imaces fClr c...."is a.rea, <br />publ.ished in Hydromeceorological Reporr No. 5SA (llMR 55A) in MArch 1984, 'Jere <br />. aPlllied co' che CherryCreel< Lake projecc. Il: w"s founl:!. :hac c.'1e reservoir could <br />safely pass no mor.. chan 63 percenc of elle :.!'.... under e:cisciug dev..,Lopmenc 'Jich <br />adequaee freecoard. <br /> <br />The probabilicy of over-:opping of e.'1,. Cher:ty C'~eel< emban1anene is very <br /> <br />relllo ce. However. che consequences of failu:ce woula b. ~:a.... crop hi,: . <br /> <br />The?MF under fueure urbanized condi:io'1.' (peak di~;charg" - 662.700 c.:.s.) <br /> <br />'Jas originally seleceed as ::.'1e base safeey condicion or dosign 8;oa1 for :he <br /> <br />alcernacives co be de"eloped in accordance "ieh J:1OR Repor: 86-R-7. Afcer :he 20 <br /> <br /> <br />June 1989 lIleeeing "'ieh HQUSACZ s:::.a.ff and on ie:s advice. ,:he base safeC"J condi:ion <br /> <br /> <br />"..as changed. ~o exiscing urbani:ed condi:::Lons. Downscre.iiLal from Che:::y C::eek. Dam. <br /> <br />ehe peak discharge for :he ?liF and floods less chan ehe PMF would increase <br /> <br />greacly wi~h dam failure !'when cQmt'are:d :Cl chI!!. nonf'ailura cond:L~:.on. The <br /> <br />?o?ulacion wit:hin ct1e pocencial Cher=-y Creek. f:Lood ares, downsc:eam :=0= che d..a.m <br /> <br />is esef.ma.eed co be as high as 138.000. PO'''Otlci.a.l floCld damages a:oe 'nearly $3 <br /> <br /> <br />billion for :he wich dam failure condicion. <br />