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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Section 2.0 <br />Study Area Description <br /> <br />2.1 Topography and Physiography <br /> <br />Box Elder Creek is located east of metropolitan Denver in the roIling plains area adjacent <br />to Colorado's Front Range. The Box Elder Creek watershed is extremely long and <br />narrow. The watershed extends approximately 100 miles from its headwaters at the <br />Monument Divide in El Paso County to the confluence with the South Platte River near <br />Kuner, Colorado. The watershed is generally 3 to 5 miles wide over the entire length of <br />the creek. <br /> <br />The Upper Box Elder Creek study area is shown in Appendix A. The study area is <br />located in the far southeastern portion of the UDFCD boundary. The upstream study <br />limit coincides with the Arapahoe/Elbert County line and the downstream study limit is <br />located at the south boundary of the Denver International Airport, approximately <br />4.5 miles north of 1-70. The study area, which is approximately 75 square miles in area, <br />is under the jurisdiction of Arapahoe County, Adams County, and the City of Aurora. <br />The area under Aurora's jurisdiction is located generally in the vicinity of 1-70. <br /> <br />The portion of the Box Elder Creek watershed that is upstream of the study area is also <br />indicated in Appendix A. This upstream watershed is located in Elbert and El Paso <br />Counties and is approximately 127 square miles in area. Box Elder Creek is identified as <br />Running Creek in this portion of the watershed. <br /> <br />The highest point in the watershed on the Monument Divide in El Paso County is <br />7440 feet above mean sea level (MSL). The lowest point in the study area, at the north <br />study limit, is at elevation 5390 MSL. Watershe(Hopography shifts from steep, <br />relatively rugged terrain in the upper portion of the watershed to moderate rolling terrain <br />in the lower portion of the study area. The transitional zone from steep to moderate <br />terrain is located about 2 to 3 miles south of 1-70. <br /> <br />2.2 Soils <br /> <br />Hydrologic soil types within the watershed study area are shown in Appendix B. <br />Hydrologic soil types were identified based on soil surveys produced by the U.S. Soil <br />Conservation Service for Adams (SCS, 1971) and Arapahoe Counties (SCS, 1974). <br /> <br />Hydrologic soil types B and C are predominant in the watershed. Type B soils have <br />moderate infIltrations rates and type C soils have lower infiltration potential. The main <br />channel of Box Elder Creek consists primarily of type A soils, which have high <br />infIltration characteristics. <br /> <br />DENlOOI5184.WPS <br /> <br />2-1 <br />