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<br />I ;JT"~}[lI.JCT I OfJ
<br />
<br />Go_'cral ch<'r~Gteristks of ~h" indillijual str"ams i1~d
<br />affected drainage :nsins, detailed descriptlons 01 stlJdy r"aG,eS an~
<br />i ndlv idJa I <;tr",1ms, ~ record <)< 1 I cod ~ istory of th,-,sCl str"~"'s, ,1nd
<br />tll e p ro;o b I 0 eft ect of f i ood 5 ~ rea ter t ha n ~ ny of rceo...: a rc ~ rc ~;()n ted,
<br />in that order, In th Is report. ^ d"f I n itlon of th" technlca I ter,.,~
<br />u~e~ throlJ~hout Is I nc luded at the ond. T'~o potentia I f lood5, I nt"r-
<br />modi~to Rt~lional and Standard Projoct, were used to represent possible
<br />grCdt flooC~. nlc Intorrcediate Regional Flood ls represr;ntative Of
<br />Onowithanalloragelrequencyof about onCe Ina hunlJrod years, 0 r
<br />apprDximately a I percent chance of occurrence In any specific year.
<br />It '~~s developed fro." un anlysl5 of slroil~r 5tre~m basins where detailed
<br />stre~m and ra i nlllll rf)Gords "ere ava i lab Ie. Tho Standard Project
<br />Flood represqntg ~ rare event and would exceed toe ~qnitude of the
<br />I ntermed late Reg ional Flood. While It hes a low prob~bll I ~y ocCur-
<br />rencainanyonastreambasin, itisr'lpr"s"ntatlveof largeflooOs
<br />that h~ve t>"",n experienced In pnst ye.lrs 1 n sor"a basi ns wi thl~ the
<br />g<)ogr"oh Ic~ I ~rea. In devoloplng controls and plannl r'\<] for flood
<br />rlain construction, appropriate consideration should be given to hls-
<br />torlr;,,1 f Ico:15, IntermeJ late fleglonn I ,1nd S~"nr,ard ProjC!Ct F looJs.
<br />FI=" OilZdrd ilreas ~"d ~"t'!r ~urlaca proflles for solectQd
<br />f 1000 Iroquencies Clra shown on 0 I"t,,~ I" th is ro~ort. ";"hesa datil oro-
<br />v i ~3 The bas" for p Ianni f(l Clnd opp I ic~tlon ot control measurog ~y
<br />1",.",1 "if;cI~I~. ::"10C)~ hp;~)ht-~ .,,,J prnj.,ctlv" "",asu~il5 c~n be estah-
<br />115ned to avoid d""ago, or' the haZilrd o~ cl",,,c'! o. f load I ng Can bo
<br />rocc,ln i zc~.
<br />
<br />This reJort rol~te5 to the flooC gltua~lon alonl several
<br />of ~oe minor tributaries of th'! South Platte River ;n the :enve~
<br />metropol ihr, ~r"~. Tr." strcar,s covc~ed In this repo~t - Yol"me 1'1
<br />I~ ~ ~erios of flood DI~in Informa~lon ~eports for 5tream~ in +he
<br />vicinity of Cenver ~ ~re 81g and Little Dry Creek5 in Arapahoe County,
<br />Greenwood Gulch, ~olr Gulch, lake~oad Gulch, South lak8~oad Gulch,
<br />\1clntyreGulch, Llt1'le Dry Creek (AdamsCoun-tyl,andGrange,l-iall Cr',ok.
<br />T~ese lie In and drain the val lay of the South Platte liver th~t is
<br />~djilcent to and east of the fronta I range of the <Jocky Moun-tai ns. Tha
<br />"estern po~tlon of the v~ Iley 15 a roll i ng terrdCe which slopes
<br />easter Iy toward t.'1e flood p Idln of ~he South Platte. The e~sterly
<br />portion of the v~ Iley ; s ~ conti nuatlon Of the terrace. but slooes
<br />wa5terly toward the South Platto. Thedra;nagebound<1riesofthe
<br />indivldo~1 b~5lns are l~dlstinct, ~elng at tha crests of the sever~1
<br />nortM-goothrollsofthoterrace. ThO creeks and 'Jolchosgenerally
<br />are ratljerdeeply atchcd insteppedprofiltllntotnebasicplainof
<br />t"e torTace dnd hdva i ""i st inet v~ Ileys ~r.J narro~ f I<x)(j p lai "5
<br />"xc"rt '~~I"r" t:,ey "prn:mch and anter the flood pl~in uf the South
<br />l'latte. Pr ior v,,1 umos 01 to i S ser; es pre5'lntad dat~ on the "",tro-
<br />pollt<lr, re~Ghe5 of He Sooth Plat~e River, Santi Crook, Toll Gilte Cr"ek.
<br />Lower Cher~y Cr~0k, ~~r ~r~e... ~"d Cle~~ ~re~k. Thp ~~~rt i~
<br />D.~pdr~d i1t the reque~t of the Inter-County R8giondl Pldnnl~g Com-
<br />ml S5 ion (now Oenllor Regiona I C0unci I of Governments) '~ith the ; ~ljors,,-
<br />"-..ntofthtlv.,:"radoS-:-"te',:,,te.r::;Onser'IIatlor,Eklilrd. Thl3repor't
<br />
<br />prall ides inform"tion On flood hJzJn's to <lld in reJucln~ fubre flood
<br />du",u<)<3s, Jnd luoMiflos the f lood h~2"rd arOilS to Jssist loc,~1 officlJI...
<br />and others in makln~ decisions conc~rnlng future develop~ent of the
<br />stre""" v~ Ileys. I nforrtliltion i 5 ~Hser. "pon ~e"ger ral nfa II and r"notf
<br />deta; hlstorlcal flood records; urban gro,,~h p~tt"rns; comparisons
<br />'~ith si'lli lar waters~od areas; i1rld other technic" I data pertl nent to
<br />floocs on these streil'll,.
<br />
<br />Th is rcport Jo"s r.o~ pro~o,:o l:nprc,/o.,,,ct,, to contro! f !oods.
<br />It I" pnNi,.Iud to 1"c~1 ,"fficla:~ f",r their !l,Ji~Jnce ln planr,in!] "the
<br />"08 5n,: n'~,JI"tjGn of t"", flood pl~in ~nJ~" :>"blfc in'or",~tlo" rngJrd-
<br />i ro rile" lood l1al.J~ds. r,(l]"la~lon 01 /looJ P I a; n use m;gM+ ~e ilccom-
<br />I'I;Sh"~ tc~o'J1JI' 7"ri,,~ ""0 SLJI){livisi"~ r"uul,~ions, constructio" of
<br />,1000 p;obc~ion '.'orks, JJp I i catio~ ot flood proof InG ",eilsures, or J
<br />c","l>i,'atlonof 5('veralapprn,'Ch"".
<br />T"chr i~J I Jg~ 15~ilnc", to Fe"E'ra I, St"te, dO') 10C.' I ~s('nc'''O
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