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<br />, <br /> <br />, <br /> <br />The field survey further provided phyaical details necessary for accurate <br />computer modeling. These included roughness coefficients, channel dimensiona, <br />and an accounting of drainage structures snd their state of repair. <br />The drainage baain was deter~lned from u.s. ~olcglcal Survey 1,24,000 <br />scale Mapa of the Milliken and Johnstown, Colorado quadrangles. The 9ubcarch- <br />menta within the drdina~ baain were a190 delineated based on these maps. <br /> <br />U. BASU~ CHARACTERISTLCS <br />Basin Description <br />The Milliken watershed 19 located south and weat of Milliken, a town <br />located in ""st-central Weld County, Colorado, 12 milM southwestef Greeley <br />(rigure 2). The 7.1 square mile baa in 15 roughly 4.4 miles long and 1.6 miles <br />"ld... Agriculture dominates the are.... I..and use ia spUr a9pro"i....tely 90 <br />percent grass andcr09lands to 10 percent de"eloped (Figure 3). <br />Orginatingatth......stendofE:rk..nb..okSc:'hoolRidqe..tdevation <br />5,010feet ..bo"" me.." se.. level (MSL) , the dr..in..qe basin Slopes northe..st <br />toward Milliken and the Little Thomspon ~ver just north of town at elevation <br />4,730 feet ahove MSL. Slopes in the upper half of the bIl9in averaqe about two <br />percent. ROughlymid...aydcv.rnthe.....teuhed,slopessteepentooverthreeper_ <br />c..nt then flatten to less than one percent approxi"",tely one mile south of <br />Milliken. <br /> <br />Two primary soil 4....ooiations 60minate the drainaqe bIl..in. Theee are the <br />Wiley-Colby-Weld and the Olney-Rim-otero. Typically, these soil.. are deep, <br />nearly level to moderately sloping and ~ll drained. The Wiley-Colby_Weld <br />soila are silt loams and loams formed in calc..reous eolian deposits. The <br />Olney-JC:im-otero soils ..re ....ndy 10""'" and loalDS forllled in mixed alluvium_d <br />eolian deposits. <br />~verage annual pr..oipitation in the basin is 12 inch..s. most of which <br />occurs between April and Scptc~er. The antire water"~ed drains throug~ <br />Milliken in one of three looationo (figure 3). The upper half and central <br />portion of the basin, comprising an ~ea of 4.3 9qUare mil..a, drain to a <br />single dr"inaqs...aywhichentere town in I.ola Park. The north..."st"rn 1.1 <br />square miles drain.. to the...eat edqe of Millik..n and the eastern 1.6 Squ..re <br />nlii" ..r.... draina to the ",.at"rn side of town. SOh'le pirating of flow occurs <br />among the thr~e depending On direotion of upland crop planting. <br /> <br />StudyAr..a <br />The baain study area 19 the Town of Milliken itself. The town colllprlses <br />approximately 27Q acres of gently slopinq river bottom land in the aiq <br />Tho"'p.~on River valley. SOllie agricultunUy oriented industry is locat..d in <br />M.Ul1~"n. <br />