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<br />INTRODUCTION <br /> <br />PURPOSE <br /> <br />UrbanIzation and rapid population growth along the Front Range <br /> <br />during the past ten years and the projection for continued development <br /> <br />particularly between Fort Collins and Colorado Springs have made it <br /> <br />imperative that the State Engineer have accurate, up-to-date hydrologic <br /> <br />and climatic information pertaining to the drainage bas ins in the region. <br /> <br />This report has been prepared for the purpose of providing such infor- <br /> <br />mation on the Bear Creek drainage basin, former Water District No.9, <br /> <br />located west of Denver. Hydrogeologic conditions are not discussed in <br /> <br />this report. <br /> <br />. <br /> <br />J <br /> <br />BASIN DESCRIPTION <br />The Bear Creek drainage basin, a left bank tributary of the <br /> <br />South Platte River, is located in portions of Arapahoe, Clear Creek, Denver, <br /> <br />Jefferson, and Park Counties (see Figure 1). The basin encompasses a <br /> <br />261, square mile area and is 36 miles long with a maximum width of 13 miles. <br /> <br />Elevations within the basin range from 5295 feet at the mouth at Sheridan, <br /> <br />Colorado to over 14,000 feet in the mountainous headwater region. For <br /> <br />administrative purposes, the Bear Creek drainage basin is located within <br /> <br />Water Division 1 which has its headquarters at Greeley, Colorado. <br /> <br />The mean annual precipitation in former Water District No.9 <br /> <br />ranges from approximately 13 inches at the lower elevations downstream <br /> <br />from Morrison to over 30 inches on Mt. Evans at the western end of the <br />