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<br />,,' <br /> <br />'" <br /> <br />"Di~ch~rge record~ for the Clear Creek ~tre<ru gal.lge~ at Gold.m (1M Derby VIere <br />al1~lyzed U~ ing methods presented 1n Bu Ilet 111 No_ 17 pub 1 ished by the Water <br />R",sourcesCouncil (Reference29). The results of thtse analyses were used to <br />calibrate the MlTCAT (Refert:lnce 11) and SIoIMM (Reference 28) runoff modelL <br />MlTCAT was used to model the 400 square mile mountainous Mea upstream from <br />Golden, and SOIMMwasused tomod..l the lower 175 square mile plains basin. <br />Rainfall values used by the U.S.A.C.E.;n the mOdels were obtained from the <br />Prec;ipitation Frequency Atlas of the western United States, Yol\llle III, <br />Colorado,publ1shedbytheNational Oceanic and Atmospneric Adrnin 1strationin <br />1973 (Ref<<rence27)."i <br /> <br />SOILS <br /> <br />50 II S within the Clblf Creek Study Area ond adjacent to CI~ar Creek cOf)~i>t <br />primorily of ~andy and gfa~elly allu~itJ!l. The~e allu~ial ~oils are moderate <br />to rapia1y perrnedble, and are ,>ubject to perlodlc flooding in tne spring <br />runoff months, April tnrough July. The four mdin soi I ~ groups found adjacent <br />to Clear Creek and lt~ floodplain are Sandy Allu~ ial Land (SM); Mo 11 ic <br />Ustifluvents, sandy-,>keletal. 0-3 percent ,>lopes (iOS); Aid., LO<<II, 0-2 <br />percent slopes (3A); i.lfld LOill1y Alluv i al Land. 9r<l~elly ,>ub~tr.,tl.ffl (LV). <br /> <br />The iO. 50 and loo-year flood ~~ent~ wer.. u'>ed in tnis ma,>ter pi an. This <br />provides the deci,lon-makers with d range of flooding conditions thereby <br />optimizing the ev.,luation and selection of a favor.,ble solution to the <br />f100ding problens along Cleor Creek. TableV.lllststhepeakflows fortne <br />10, 50 and lOO-year e~ ents ot v or ious loc at ion, a long Cl ear CreeK. <br /> <br />Detailed information pertaining to the sOils, classifications and ch<lracter. <br />i st ics along Clear CreeK was prepared by the U.S. De~drtment of Agricul ture, <br />Soil Conservation Service. The information lscontained inthelnventorY<lnd <br />Evaluation of Soils for Jefferson County. prep<lred bytne Field Office and <br />Soil Survey staff of toe U.S.O.A. Soil Con~erHtion Service for the UrboO <br />Draioage and Flood Control Oistrict.Apri14, 1980. <br /> <br />TABLE V.l <br />PEAK RUNOFF FLU~S <br />FUTlJREDEVELOPMENTCONClITIDNS <br />(all yal ue~ in Cubic feet per second) <br /> <br />Sandy Alluvial Land <br />Sandy Alluvial Land (SM) conshts of unstable acc(lllulation of gravelly and <br />sandy alluvi(lll. and i,> lOC<lted adjacent to Clear Creek in Ad~~ County. <br /> <br />LOC<ltion <br /> <br />10-year <br /> <br />PedkFlo..s <br />50-year <br /> <br />lOO-year <br /> <br />Youngfielct Street to Coors <br />Di ~ers ion Dam <br /> <br />3,500 <br /> <br />8,500 <br /> <br />13.~UD <br /> <br />MollicUstifluvents, sandy-SKeletal, O.jperc,,"t ,>10pd. <br />The predominant soils type adjacent to Clear Creek in Jefferson County lS <br />classified as mllic Ustifluvent> (105), is formed in stratified saMy an<l <br />graveliY<lliuvicl11,andissubjecttoperiOdic floO<ling. <br /> <br />Coors Oiversion O<<II to <br />Golden City Limit Upstream <br />ofU.).o <br /> <br />3,3UU <br /> <br />a.ooo <br /> <br />12,5GO <br /> <br />AldaLoam,O-tpercentslopes. <br />This Ald<l soli is deep <lnd somewh<ltpoorlydrainedon low terrace, and fiood. <br />plains. is formw 1n calcareous, lo<l1ly over sandy and gravelly alluvi(lll. <br /> <br />lGingery kosociates. Inc.. "Flood HaZ<lrd <br />Ad<<IIs County and Jefferson County." NovE!l1ber <br /> <br />''''' <br />1979. <br /> <br />Delineation. <br /> <br />Clear <br /> <br />Cre~k , <br /> <br />LOilmY A I I u~ ia I Land. gro~ el Iy > ub stratlJ1l (L V) . <br />ThlS ~ils type occurs adJacent to major ctrainageways, <br />of gravel .,nct issuojecttoflOOding. <br /> <br />is a principle source <br />