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<br /> <br />\.::! <br />I-il <br /> <br />"P"u. <br />I <br /> <br />o <br /> <br />2 <br /> <br />Soils Map for Jefferson County, dated June 1972; and A General Table for <br /> <br /> <br />Soi Is Characteristics.2 The Study Basin has two fairly distinct soi I <br /> <br /> <br />regimes having different characteristics and engineering properties. <br /> <br /> <br />The basin area west of the Hogback is made up of approximately 25-30 per cent <br /> <br /> <br />rock outcrop with the remaining soil being granular weathered rock material. <br /> <br /> <br />The basin area east of the Hogback is made up of a mixture of soils from <br /> <br /> <br />the Nunn Fondis, Weld, Samsil and Shingle Series and a small portion of <br /> <br /> <br />Fort Collins Series. The soils are generally clay or silty clay loam <br /> <br />with alluvial material located in the South Platte River flood plain. <br /> <br />I <br /> <br />'- <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />SCALE 1- I, <br />\,~ rl~"~1" <br />,-""J ~ (,I \ ~ <br />(R[~R6e~' ,II <br />. \"p-" \~, <br />(PAiI~-J~" ')1 I, '0~ <br />" ',c"'J ,I I "''\> <br />i(!1 'I' I ",,< <br />~ \ \ ~ 1\ MORRISON """ <br />-''''"'\It,I. ./". \ <br />'\--\~-~ ,.....~ I r:---- <br /> <br />I~~~ <br /> <br />-\:.~_/"",', > <br />"'" .!'5- <br />f <br /> <br />') <br />~ <br />.-r <br />-, <br /> <br />Presently, only the few newly developed residential areas have storm <br /> <br /> <br />sewer systems which include both small conduits to accommodate high <br /> <br /> <br />frequency low volume storms and large structures crossing major drainage- <br /> <br />ways to accommodate lower frequency, high volume storm runoff. For the <br /> <br /> <br />most part, the entire Basin area is drained by existing waterways which <br /> <br /> <br />are crossed by various types of drainage structures from large box cul- <br /> <br />verts under Kipling, Wadsworth and Pierce Streets on Dutch Creek to small <br /> <br /> <br />corrugated metal and reinforced concrete pipes under Coal Mine Road and <br /> <br />cart paths in the Town of Columbine Valley also on Dutch Creek. Many of the <br /> <br /> <br />drainage structures such as the conduits under Kipling on the North Branch <br /> <br /> <br />of Lilley Gulch, under Coal Mine Road on Dutch Creek, and under Bowles <br /> <br /> <br />on Coon Creek have filled to some extent with sediment deposition which <br /> <br /> <br />has reduced their hydraul ic capacity. <br /> <br />I <br /> <br />.;y.. <br /> <br />I <br /> <br />I <br /> <br />'" <br />'----- <br /> <br />/-(" <br />- / / ! <br />'v) I , <br />. J (, <br />-', <br />--- <br />J '--,_ <br />'f"'!''''_/ '~ <br /> <br />/ . <br />--",-.~- <br /> <br />There are also a number of dams, reservoirs and irrigation diversion <br /> <br /> <br />structures located on the major drainageways within the basin area that <br /> <br /> <br />affect the overall drainage characteristics of the various sub-basins. <br /> <br /> <br />Some of these major features include the following: <br /> <br />~- <br /> <br />I <br /> <br />DUTCH <br />COON <br /> <br />CREEK. <br />CREEK <br /> <br />LILLEY <br />BASIN <br /> <br />GULCH. <br />AREA <br /> <br />OOUGSCOU7 <br /> <br />'-~~- <br />-~~ <br />\ <br />\ <br />\. '\\, <br /> <br />On Dutch Creek: Nevada Ditch crossing and small retention pond <br />within the Town of Columbine Valley <br /> <br />On Lilley Gulch: Hine Lake and several small retention ponds <br />in Jefferson County <br /> <br />North Branch of Lilley Gulch: Johnson Reservoir in Jefferson County <br /> <br />'-,~ <br /> <br />I <br /> <br />VICINITY <br />FIGURE <br /> <br />MAP <br />1 <br /> <br />2. Table of characteristics for Soil Associations - Colorado State Key <br /> <br />for County General Soil Maps, vs. Department of Agriculture, Soil <br />Conservation Service. <br /> <br />3 <br /> <br />I <br /> <br />URS COMPANY <br />