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<br /> <br />I <br /> <br />I. <br /> <br />10 <br /> <br />1 <br /> <br />I~:.l'y.~~.!:~..~.tu.L~;!..aY: <br /> <br />1 <br /> <br />Tt)e wate~sheds that pt"C'dllCe rur~off to cnannels in and around C.rip~!le <br />Cr'eei< are reiat~ve!y sma!! in size arid at hiSh elevation. "fhese tWCI <br />Chjlr'i1ctt\t"If.:.tic~~ lit-E' vei'.'i ~:.i~.~r'{ifica.l!t tCI the hYCit"l)fc!8Y of thE' 3.t-f::'ct. <br />l~i3t) elevation watersheds do not receive t~le depth of rainfa; I <br />expet-ienced at lower elevaticlns~ <br /> <br />I <br /> <br />1 <br /> <br />The smal I contrlbut~n9 drainage areas do not produce ser'iou5 runoff <br />ft"orn srlowmeit. Tt)e U.S. Ar~IY CC!t-r's of Errgineers computel~ program HEC-l <br />was used to test tl1e corltrlbution sl-,owmelt ma~(es to peak (iischarges. <br />It appears ttrat Sr"IC1wme!t is not SiSflificarrt fot- fJood frequencies of <br />1() year and 8t"eater, Wl1ich il" tt!e pri~)ary concern of ttlis study~ 'i'his <br />imp) i€~~~ ~Cflt!.t. si~jni'ric:a.nt f!O,)(jir-i:::.! is roost. i l!<f..'!',/ to be frWI)fn j""'a.inf::'!.! <br />event5~ As a [c1nsequence, ,)f)iy I~ainfa!! gerlerated j""'unoff was <br />c: (I n sid f~ f' e d i r! d P \l P i (1 pin ~.! P f} a k d!~) C h a.I":3 e -.r !.- f.:' que r~ c: y val u e sin C I U I] E' d <br />hE'!'-e i n ~ <br /> <br />Pea~~ discharge values devejo~'ed by GM3, ~nc. C:Of!5ulting ErI8!neer'S f('r <br />thE' II Dr" a. i na.~iE' l\iaster- F'I a.n Po!'" ThE' City of Cr- I pp! e Cl'-eek, .t!"pr- i I 1')')2:" <br />-for' f'utur"e conditjon~" ',.,...i i bE' u'~~:.f.'!d in cor:Ju~'lctior'i Io.',th the HE(,-"~;:: <br />hydr'::iu i i c rno,jf;?! to dev(.? I (1) I,.;!i:ttel'- '!;:.ur-fa,c eel eva.t i l)ns ~ pr-of i I es" a.nd <br />flood plain maps included In t.his r-epot"t~ <br /> <br />8MB, Inc. Consulting Engineers used ti"ie Ratiorl2i <br />a. TF:Wh20 analy~-il.;~ fOj'- cal ib~"atj')ri pUrp(,sE'-:::, in tr;E' <br />IIU!"a i r;a~j€' !'Y!'iist;et' F'l an for" C~.. i p~.l i E' Cr'12E'j.::, A~;l"" j ! ~ <br /> <br />Fo~mUla 5up~'ot-ted <br />p~eparation aT tt'12 <br /> <br />".y <br /> <br />.;,''',,-,.-;. <br /> <br />1 <br /> <br />NOAA Atlas for CCllorado was used as a ~efe~ence for 24 hour rainfal <br />ciept:"!s initial ly. Histot~IC;ll .;tation pl-'fle ipitatjon data. I.,Jas als.l) <br />anaiysed as a possit,je alter-native to usirlS NOAA Data. It was <br />deter'mined ttla,t historical station precipitation (iata"was more <br />representative and the~efore was used ir! this study. No Aerial <br />adjustments wet"e made because of t~le smal j drairiage areas involved. <br />Thf:." fJoi I Conset-vation Sf:.'t-vice (bCS) ~:~4 hout- t''lpe II t-ainfall <br />distribution was selected fc,t" use in the TR-20 computer model to <br />geflerate peak disctlar-g8 - frequerlcy values. <br /> <br />I <br /> <br />1 <br /> <br />1 <br /> <br />Hydr-olo~Jic r~unoff cur-ve numberns \<"IE'r"e developed fr~oro ver-y I imited SOli <br />and land use information and field observationSA The Soj j <br />Conservation Service soi I scientist from Canon City was tonsu~ted to <br />(,btain thp bt:~st infol'"roat:ion aV~l.i iable for' the Cr-ipple Ct-eek 'dr"t?d.. <br />Bettet- data is not: availa.bie at this timE'. <br /> <br />I <br /> <br />I <br /> <br />1 <br /> <br />1 <br />