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<br />2-4 <br /> <br />Comprehensive planning has not yet been completed in the remainder of the study area <br />within Arapahoe County. It was determined by the project sponsors that the study <br />objectives could be satisfied without having detailed planning information in Arapahoe <br />County, as long as the watershed was modeled on the basis of a reasonable assumption of <br />mixed urban land use. Future imperviousness in this area was assumed to be 40 percent, <br />which is considered by UDFCD and the other sponsors to be representative of mixed <br />urban land use based on assessments of other urban areas. In the absence of detailed <br />planning information in Elbert County, future imperviousness in the portion of the <br />watershed upstream of the study area was assumed to be 10 percent, which is <br />representative of a mix between general urban land uses and large-lot residential uses. <br /> <br />DENlOOl5 184.WP5 <br /> <br />I <br />II <br />I <br /> <br /> <br />Imperviousness representative of future development conditions in the study area is shown <br />in Appendix C. Future imperviousness for long-term full build-out conditions was based <br />on input provided by the project sponsors. Future imperviousness in the portion of the <br />watershed from 1 mile south of 1-70 to the north end of the study area was based on the <br />City of Aurora's Comprehensive Plan (Aurora, 1993). This area includes all of the City <br />of Aurora and Adams County within the study area and the northern 1 mile of Arapahoe <br />County. <br /> <br />