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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 /> <br />3. CAMP CREEK HYDROLOGY <br /> <br />3.1. Watershed Description <br /> <br />The Camp Creek drainage basin (CPC) is located generally west of downtown Colorado <br />Springs (Figure 3.1), The majority of the basin lies within the Pike National Forest, where the channel <br />flows southeast When the channel enters the City, it turns south for approximately 3 miles to the <br />confluence with Fountain Creek near 30th Street The low portion of the basin is residential <br />development and the channel is concrete lined, <br /> <br />The total basin area is 10.26 square miles, In the upper basin, hillslope gradients range from <br />10 to 60 percent and channel gradient ranges from 6 to 9 percent In the lower basin, hillslope <br />gradients range from 2 to 30 percent and channel gradients are under 3 percent The concrete-lined <br />channel gradients range from 2,0 to 2,5 percent <br /> <br />Within the Pike National Forest, soils tend to fall in the "C" and "D" hydrologic categories as <br />defined by the SCS and include a significant proportion of rock outcrop, In the lower basin, "A", "B", <br />and "C" soils are predominant <br /> <br />3.2. Previous Studies <br /> <br />Two previous studies of the basin were available for review, These were the FIS - City of <br />Colorado Springs (Ref 2,1) and the Camp Creek Drainage Study (CPCDS) (Ref, 3.1), The FIS <br />hydrology used TM1 methods (Ref 2,3), The FIS excluded areas of the basin located over 9,000 It, <br />msL The hydrology for the FIS was developed by the U,S, Army Corps of Engineers and is presented <br />in a hydrologic report pertaining to the general Colorado Springs area, The TM1 approach tends to <br />result in very generalized estimates of streamflow when applied to small watersheds, The CPCDS <br />used guidelines previously specified Colorado Springs drainage criteria, The procedure used in the <br />CPCDS combines SCS methodology with synthetic unit hydrographs and some routing effects, <br /> <br />Peak discharge results at the confluence with Fountain Creek are presented in Table 3,1 for <br />the two studies, The considerable difference in the peak flow is not unusual, given the differences in <br />technical approach, <br /> <br />3,1 Resource Consultants & Engineers, Inc, <br />