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:NTROOUCT!G~ This raport waS prap~red dt the request af the Puablo Regional Pl~nning Commisaion, through the Color~do Water Conserva_ tion Board, to dafin~ tha flood sit~ation along Wild Horse-Dry Creak, Dry Creek, and Condnight Arroyo in ths vicinity of PLsblo, Colorado. References to Wild Horse-Dry Creek ~pply to the Arkansc6 River north_ bank tributary whioh oonveys th~ co~bined 6tr~~mflows of ~ild Horse Crsak and Dry Creek fro~ their oonfluenoe northwest of Pueblo (ne~r the ~ild Horse subdivision community), through the oity's north- west q~adrant, to disch~rge into the Ark~nsao River. D~t~ are included to ~id in solving local flood problems and in determining the best uSe of land .ubJect to overflow. The report is based upon information on r~inf~ll, runoff, historioal flood rocords, existing concentratio~s of devolopment, stre~~ condition~, ~~d other hydrologi~al f~otors whioh bear upon the o~currence end ei'e of floods in the Pueblo ~rea. ~a~ development, l~~d use cha~ges, bridges ~cro.s the ~hannals, end channel o:taro- tions i~cluding construction of ras8rvoirs ~re a few of the faotors that would affect the amount of runoff re~ohing the streams and their oap~city to convey the flood flows. Exp~nsio~ of developments in large ~rsas of the wdtershsds studied or c~nstruction of wdter control struoturesrn!lY alterhydrologiol<1 conditions suffioiently to w~uent futun reviews and possible a~,endment of this report. The report covers two ~ignific~nt phases of the flood problems arising in the eubject w~terahed5. First, it brings to_ gether such reoords a. ~re dv~ilable of past floode in the areas considered and, seoond, it treats probeble future floods, namely: !nter~odiato Rogion~l Floods an~ Stand~rd Project Floods. l~ter. medi~te Region~l Floods h~ve an ~ver~ge frequency of oocurrence in the order of once in 100 yeers. Th~y ere detorminod f~om on ~nalysi. of kno~~ floocs On the Arkan.as River watsrshed ~nd other sheam. in the s,,",o gen~c~l g8ographioal region which h"ve .imil~r ?hysic~; oh~racteristics. St~ndard Projeot Floods are floods of rare occurrenCe that, on most streams, are consider~bly larger than any floodo experienced in the past. In problems conoerned with the plan~ing e~d manege~ent of dsvelo~ment in the flood plains of Wild Horse.Dry Creek, Dry Creek, and Goodnight Arroyo, the possible futurs ooc~rrence of floods the size of the Intermediate Regional flood ~nd the Stendard PreJect Floed should be considered. The roport contains ~~po, profiles, end c~oos soctions which indioate the e~tent of flooding that may occur in the futuro in the 9tre~m reaches studied. This should prove helpful in pl~n_ ning wiss use of the floed ploins. From the maps a~d profiles, tho depth of pcob~ble flooding by the Intermedi~te Region~l or Standard Project flood at any location may bs estimatad. With this inform~_ tion, floor levels for buildings mey be planned high onough to avoid flood dam~ge or, if at lo~er olovatione, with recognition of the chanee and hazarde of flooding that are being taken. The report does not include pl~ne for the solutioh of flood ~rohleme. Rather, it is intended to provide the baSis for further study ~nd planning on the part of the city of Pueblo and ths Pueblo Regional Plar>ning Commission. In developing lo~~l plan- ning progcams, considor~tion sho~ld be given to providing instruc_ tions for dio~atsr operations, oontrolling deuelopments in the flood plain through zoning and subdivision regulations, and includ_ in~ appropriate structural adaptations in building codes. The combining of nonstructur~l oontrol measures with constcuction of flood protection works gener~lly oonstitutes the most effeotive ~p~roach to flood loss ",,,n~gement. The Albuquerque District of the Corps of Engineers will, upon ro~uest, aeaist feder~l, State, and looal agencies in the inte~preteti~~ and use of the information oontained herein. and will provide other available flood data rel~ted thereto. for definition of epeoiel terms used in this rspor:, refer to the Glossary of Terns Section. i u