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<br />Flood O~clJn"nc~$ <br />Inv8stig~tion indicates thet floods occur on Dry <br />Cresk with ~pproximetely the same frequency ~s on ~ild Hor~e-Dry <br />Creek. ThesG floods vsu~lly origin~te in severe storms exper. <br />ienced duri~g the l~te spring or suw~e. months as described <br />previously undor "flood occunences" pertaining to Wild Houe- <br />Dry Creek. The physical features of the Dry [reek w~tershed can <br />produce the r~pid concontration of runoff th~t Ghar~Gterize8 flash <br />floods of high peak flows, smali volumes, and short durations. <br /> <br />GOllON I G~IT ARROY 0 <br /> <br />Flooded Are~~. Flood P.ofiles. ~~d C.O$S SBctions <br />Plate 6 ~hows the app.oximate areao along Ory Creek <br />that would be inundated by the Standard Project flood and the <br />Intermediate Regional flood. Ths actual limits of these over_ <br />flow areas o~ the ground m~y vary slightly from thosa shown on <br />ths m~p beca~se thB 10_foot contour i~terval and acale of the <br />map do not pBrmit preoise plotting of tha flooded aree boundaries. <br />Plate 10 shows the high water profile" fo~ the Sta~_ <br />dard Project ~nd Intermediate Regional Flood5. A~curat" ostimates <br />of water ~urface elev~tions may be obtain~d from these plates. <br />Plate 12 shows two cross section~ that ara typical <br />of the 19 sectio~e obtained o~ Dry [.esk in the rna~h i~vBeti- <br />gated. Tha locations of all sectio~s ,or" ~how" on thB above <br />referenced plates, as well as the elevations H~ extent of over_ <br />flow of the StB~dard Project ,lood and l~termudiatB Regional <br />Hood. <br /> <br />The Stream and Its Vellsy <br />Goodnight Arroyo is an ephemeral ~outh~bank tributary <br />of the Arkansas Rivsr that originBte~ on ths high pl~ina ~outh_ <br />west of Pueblo. The triangular-8h~psd watershed spans a diet~nca <br />of 4.g miles from the headwaters to the ~outh. It hes a maxi~um <br />~idth of 2.9 miles and ~ drainage area of 5.9 square miles. <br />Elevetiona in the ~atershed vary from 5,330 feet at the headwaters <br />to 4,708 feet at the Arka~ea~ River confluence. <br />Goodnight Arroyo's longest branch originatee ~pproxi- <br />rnately 1.4 miles sowth of State Highway 76 from whence it meandars <br />in a northerly direction. Just outside Pueblo's existing western <br />boundary, h~ediately .mat of the Good~i!lht subdivision ..rB~, th" <br />arroyo passes u~der 8eeee~er Ditch and State High~ay 96 (Thatcher <br />Ave~ua) and tur~s west in its fi~al approach to the ~rkansa8 River. <br />The snortsr bra~ch of tho arroyo originates north of State High_ <br />way 7c, starting as two forks that join after flowi~. about 1.5 <br />",iles. f"lmdng northM~terly a~d rOClghly parallel to stote H;,gh_ <br />way 76, the two branches join at Mile 2.43.' Flows in the arroyo <br />are th.. reeult of s~owmelt and r"inf~ll ru~off dwri~9 the d~t..r <br />and o~rLy spring. During the summer mo~ths, the flows result fro~ <br />thunders tor",,, o~ ge~aral rains over the s~tire water.hed. <br />The rolling high plains terrain is f3irly rough, bro- <br />ken, and sparsely vegetated. The vegetation is typical of the <br />semi_arid high plai~s--predomi~antly sage brosh, cactws, and native <br /> <br />rlood Descriotions <br />There are no k~o~n historical recordn of flood~ on <br /> <br />grass. <br /> <br />JO <br /> <br />The study reach extends from the mouth of Goodnight <br />Arroyo at the ArkansQs River to Mile 2.52 which is jwst south a~d <br />"pstrea~ of where the short and lon~ branches joi~. floods in <br />the study reaoh nor~ally origin~te from runoff of the s~tire w~_ <br />tershed due to the limited are"l extent of the dralMg~. Th~ <br />"teep "lapes ~nd long ~arrow s~ape of the ~rai~age ~re conducive <br />to fast riS$s a~d high peak flows of short duration. The ave.age <br /> <br />Ory Creek. Discussion of large Hooda i~ the PueblO region 16 <br />cont"in~d in the Ilurtier "flood descriptia~"" pertaini"g to <br />Wild Hor~B-Dry Creek. <br /> <br />31 <br />