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<br />Sum~ARY Of fLOOD SITUATION
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<br />summarize significant finding. which are discLssed in more detoil
<br />in e~cceeding section. of this report.
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<br />The city of Pueblo, Coiorado. is located at the con-
<br />fluence of the Ark"ns~~ River and ro~"hin Creok (~."" Plate 1).
<br />rloodprone drainage, of the Arkan~a~ Rivnr that contributs to tha
<br />Pueblo flood ~roblem incl~de' Dry Crack, a north-bank tribut~ry,
<br />flowing "u~th j~~L '~ithin Pueblo's easturn boundary; '~ild Horse_
<br />Dry Creek, also a north-bank tributary but flowing southeasterly
<br />through tho city'. northwest quadr.nt into the Ark~nsa$ River; and
<br />Goodnight Arroyo, a ~outh-b8nk tributary that meand~r5 northe~st_
<br />erly to the Arkansas River at a point j~et outside th~ westarn
<br />corporate iimits of Pueblo.
<br />Thie ~epo~t covers portion; of the,e looal dr~1nages
<br />th~t are within the planning juri edict ion of the Pusb:o RQgion~l
<br />Planning Commi~~ion. A~ ~hown on Plate 2, the dudy oreas ~onsic-
<br />ered sncompaes 11.42 miles of cha~nels incl~~ing 5.70. 3.20. ~n~
<br />2.52 miles. ras;oedivsly, on Wild Horee~Cry C~esk, Dry Creek, ""d
<br />Goodnight Arr.oyo.
<br />Pueblo'~ prinei;>,,-l re~i<ienti~l deveio;:,"oflts .are On
<br />high Sracnd ~djQining tho ~'oter~oy~, b'Jt 00"8 residenti~l ond
<br />cO",IT.~rdal development sxists on flood pl"in l,,,,ds ~'hich are
<br />~"""di,,tely ~djo~e~t t~ t!-:o "~"ac- chcnnel~. A 9".a::t fioc~
<br />COUld inundate a largs segment of th~ downtown c~msrcial and
<br />industrial ar~as. Portions of theso 1~nd5 and the are~5 spe~if~
<br />lc~lly studi8d in thb l'''jJUl'l Ino" 10,,,.,,, inun!.bl"J by fioodo of
<br />the past, and even larger ~re"e "oLlld be inundateD by the ~c_
<br />tenti~lly gr~ater floods of the future.
<br />There ars no etre"mflo~ re~ords on Wild Hor~,,-Dry
<br />creek. ~ry Cresk, ~n<i Coodnight Arroyo. Histori~d dC(;U,nBnto
<br />.nJ newspaper files hav~ b~,,'" sCdrched for inform"Uon GCnC~rn-
<br />i~g p~st floodc. From these i~veetig~tionc and st~dies of ~oc~
<br />sible future flood~, the local fleod .ituation hae been devel-
<br />.'paC for the speci.fied '~"'ter""I"' The follQ"i.n~ ;:J;" ,,;r~ph"
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<br />HISTORICAL FLOODS occurring in the general Pue~lo region h~vo bOOn
<br />repcrtoJ ~ith ~easanable ~~c~racy since the mid_1800's. P~"blo
<br />floods ~hich pri~arlly involved ~he Ar~~ns~s River and, ~ost ~rat_
<br />~bly, sim~ltaneous flooding on the study tributaries "ere recorded
<br />in i864, 1894, 1921, and 1935. Reli.ble information of other
<br />damaging floode that h~ve occurred haG bean loat in the obscurity
<br />of time. Except for the urban flood plain encroaohment existing
<br />on Wild Horse_Dry Creek near its mouth on the Arkansee River,
<br />develapment hes begun only recently in the flood plain are~" con_
<br />sidered i~ the report. As. rssult, definitive records of p~st
<br />floods are extremely ~aag~r for tha throe tribut~ry dr~inagee'
<br />Wild Horse_Dry Creek, Dry Creek, and Goodnight Arroyo.
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<br />INTER~EDIATE REGIONAL FLOODS ~ra floods that h~oe an average fre-
<br />r,uenoy of o~currence in the ord~r of onoe in l:C years. They ar~
<br />d"termined frcrll a~alyse~ cf p~"t floods tI,,,t h~ve occurred on the
<br />su~jact trlbu~aries end other 9tre~mS in th~ gar.ar~l ~'e~.
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<br />STNmARa PR0..!E~, ,~DOOS ~r~ ~~"ode 'J,'~l~h ,,~uld ~c ~~~~e~cd C'11y 0-'
<br />ra~e o~cas1ona and are reasonably ~haracte~istic of tI'e geugraph-
<br />ic"l arC" in ,"hi~h the drain~g" basin ~s located. In many instances,
<br />th~y "'ay define the upper lif1'l~ of flooding agaInst ~hit\h ~rotec-
<br />tion m~y be gought. The St"nda~d Project flood ~'ould avar..ge less
<br />than 1 foot high~r tho" the Inter"'edL,~~ Regional flood along most
<br />of Dry :reek and Goodnight Arroyo. Cn ~lld Horse_Dry CrMk, the
<br />~ompar3ble height difference ,"ould nvarago betwa~n 4 one 5 feet.
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<br />FLOOO DA~ACES re.clting from either the :nterm~di~to Regional
<br />,lood or ~he Standard Project flood "o"lJ be noru ~xtensive th"n
<br />f~cm past f:oods because of inrrea3~d devalop~~nt in the fluoC
<br />rlilin. ~_nd the '~icer ex~en~, greeter d~oH,". dod higher vsloci-
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<br />ti~5 of flyod ~~tera.
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