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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 />8. BLACK FOREST HYDROLOGY <br /> <br />8.1. Watershed Description <br /> <br />The Black Forest drainage basin is located north of Colorado Springs and east of the Air Force <br />Academy in northwestern EI Paso County (Figure 8,1), The drainage flows in a southwesterly <br />direction crossing 1-25 and continuing across the Air Force Academy land into Monument Creek. <br /> <br />The basin has an area of approximately 3,79 square miles with the majority being platted, but <br />yet undeveloped, In the upper portion of the basin the Slope is approximately 6 to 8 percent with a <br />gentler 2 to 4 percent slopes in the lower part of the basin, The majority of the existing drainages <br />are dry most of the year appearing as natural valleys and swales. The primary channel begins at the <br />northern most reach of the basin and is very well defined with year-round flow through 50 percent of <br />its reach. <br /> <br />Hydrologic soil category "B" covers the majority of the Black Forest drainage basin as defined <br />by the SCS maps of EI Paso County, Rock outcrops are present in the upper portion of the basin with <br />small patches of category "C" soils in the middle, <br /> <br />8.2. Previous Studies <br /> <br />The only comprehensive drainage study completed on the Black Forest basin was done by <br />Wilson & Co in May 1989 (Ref. 8,1), There have been numerous private drainage studies of the area <br />performed by Colorado Engineers Inc" H,J, Kraettli & Sons, Leigh Whitehead & Associates, Costin <br />Engineering Co., Denver Engineering Corp" and Greiner Engineering, Inc, The majority of these <br />reports used the SCS rainfall-runoff method, however the criteria for the size of storm event varied <br />from a 5- to 1 DO-year storm, <br /> <br />These studies were reviewed and evaluated for their validity given current EI Paso County <br />criteria, The Wilson & Company report utilized methods consistent with current criteria and the <br />discharges determined within it are recommended for use in further studies, Results of this study are <br />presented in Table 8.1, <br /> <br />8,1 Resource Consultants & Engineers, Inc. <br />