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<br />I~RO!)lICTIOI'I
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<br />General <:~,lracter;stlcs 01 the Indlvld,,~1 strea"'s Md
<br />affected drainage b~sins, detaIled descriptions of study reaches and
<br />indIvidual streams, a record of Ilood hIstory of these str9n~s, anc
<br />the probable effect of floods greater than any 01 record are prosentoc,
<br />I n that order, I n this r"p.ort. A Jef i nltion 01 tho. technlca I t"r~~
<br />u$cdthroug',out is included at the end. Two potential floods, Intcr.-
<br />m~dlate 2egion~1 and Stand~rd Projoct, ~ere used to repre5ent posSible
<br />>lrt>"ffloodS. The I nterrneJ iate Regional Flood Isreprosent"tlveof
<br />one with an average froqu8ncy of a~t once in ~ hundred year5, or
<br />approxl~tely a I percent chance of OCCurrence In any specIfic year.
<br />I t '~as developed from <In anlysls ot s 1",llar streitt':1 basi ns where det"lled
<br />streamandralnf"llrecordswereav<3ilable. TheSt<3nd<lrdProject
<br />Flood represBnts a r~re event and would exceed tho ~agnitude 01 the
<br />I ntermed I <lte I~eg i on;) I Flood ."h II e it h i:l S a low rroba b I I i ty occur-
<br />ronce I ~ any 01\0 ~treem ~as in, it Is represe.1tatlve of large floods
<br />that have boen experienced In past yeers in some basins wlt~in the
<br />geographIcal area. In develoolng controls and p'<lnnlng for flood
<br />ola In constructior" a~prQpriate consideration $1'o<,ld be 'liven to 111s-
<br />
<br />This report relates to the flood sltu<ltion alon~ several
<br />of the minor tributaries of the South Platte River in toe C0nver
<br />~tropoiltar orea. The strei:lms covered In thTs report - Volu~e IV
<br />in a series 01 flood plaIn information reports for stroa~s in t~e
<br />vicinity of Denver - are Gig and Little Dry CreekS in Arapahoe County,
<br />Greenwood Gulch, Weir Culch, Lakewood Gulch, South Lakewood Gulch,
<br />Mcintyre Gulch, Little Dry Creek (Adams County), and Grange Hall Creek.
<br />These lie in and drain the valley of the South Platte River that Is
<br />adjacent to <lnd east of the frontal range of the Rocky Mountains. The
<br />'~estern portion of the va Iley is a roll i ng terrace whiCh slopes
<br />easterly toward thoflCX>d plaTnof the 50uth Platte. Theeilsterlv
<br />portion of the valley is a continuation of the terrace, but slopes
<br />westorlytow"rdtheSouthPlatto. Tho dralna!)eboundarTes of the
<br />Individual basins ore IndistInct, being at the crests of the sever<ll
<br />north-south rolls of theterr",ce. Thecreeksand<]ulchosgenorally
<br />are r<lth(>r deeply etched In stepped profile intotllOba5lcpl"lnof
<br />theTerraceondhilVe IndistinctvalleYSilndni;lrrow flood plains
<br />cxe,)pt ~.hero thGy apprOl)Ch an~ .....tar the flood p 13 in of the Sout~
<br />Platte. Prior vol~es of thTs series presented dato 011 the metro-
<br />politen rQiJC;'OS of the South Platte Rivur, San"Creek,ToIIGeteCreek,
<br />L..,...."r Cherry Cr...'k, [lo<\"r Cr.."~, "nrl CI""r Cre"k. T/'!.. r"rr>rt i ~
<br />p~epared at the request of tho Inter-County Regional Planning Com-
<br />missIon (now Ce,wer Reg I onilI Counci I of Governments) '~ith the Indorse-
<br />mer.t of the ~olor<ldo St~te Water Conservation BoJrd. This roport
<br />providesinform.otiononflooJh"lardstoaid inreducl"'1 futureflocd
<br />dJnages, Jnd idontlfies the flOOd hJlard areas to assist lecal officials
<br />and othor5 in making docl510ns concernln~ future development of tho
<br />stream ualley~. Informotlon is based upon meager roinnll ilnd runott
<br />datil; historical flood recordS; urbnn growth pattorns; comparIsons
<br />~i th sl~i lar ~iltershed aroas; end other technica I data perti nent to
<br />floods on those streams.
<br />
<br />terTcol fla<Y:s, Inte'-"e6,atcr,e,lionill and Stand"rd "rojeet FloodS.
<br />FIOOdl\eZilrd<lreasandw<ltersurfaceorofilesfQrselecterl
<br />T.'10S0 rl"ta "ro-
<br />
<br />f loo~ tre'1""nclos '''''0 shnwn on ol"tes in thl c, report.
<br />v;d3 the bi1S0 for p(Jnni"'J Jnl1 application of control
<br />
<br />moasuresby
<br />
<br />l:;c~1 off;c!~!~. f!or.r "~IS!'T~ ::l~d ~r<,t'O>;:+iv"t """~su~e~ c~~ b" "st,,~-
<br />
<br />IlsheJ to Jvuid Ja"k)]", or the h<lzard or chdnco of Iloodi n9 c~n biJ
<br />reco."nized.
<br />
<br />Tili. ";port JDW, not propose imr"..ove'1lents to co~trol lloo<1s.
<br />I t is prov irlod ~o loca I off Icia I ~ for thei r gu id~!\c" in :>lann""J the
<br />uSe anJ re~Jlatio" of h" flood plain and <;s ""blie i"formation r"tcard-
<br />I nJ to,,, flood hazor."$. Ro,I~lat;on of f I(}{)j pl"i n use mi~ht be accom-
<br />~li~hcJ tr.rougli zooin!) a~d Subdivision reJ'J'~tlaT's, constructIon of
<br />t Icod "rute,,! ion works, d~p I ic~tion of f 100J proo' I n,l t"e<lsures, or a
<br />c~hinat;on of 5evcr~1 Jppr~lc~e~.
<br />Techr'icol <1s5Tst,,.,ce te F.eder"l. St,"~(1, "n~ loc,,1 .1g",rcies
<br />
<br />II
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