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I I I I I I I I I I I I I I I I I I I CHAPTER 5 PLAN OF DEVELOPMENT Hydrology The Victor No.2 Dam and Reservoir are located on East Fork Creek approximately 5.5 miles northeast of the City of Victor. The total drainage area at the dam is 6.36 square miles. Figure 5.1 presents the drainage basin which contributes to the Victor No.2 Dam. From its headwaters, East Fork Creek drains in a southerly direction to its confluence with West Beaver Creek approximately two miles below the Victor No.2 Dam. The basin is generally narrow with an average width of 1.5 miles and a length of about 6.0 miles. Elevations range from 14,110 feet at the summit of Pike's Peak to 10,390 feet at the reservoir. The basin is characterized by steep stream channel gradients and steep to rolling topography. Ground cover consists mainly of forested lands. A major portion of the basin lies above timberline. The majority of the soils fall into the B hydrologic soils group. All but the lowest half mile of East Fork Creek (including the reservoir) is in the Pike National Forest. Access to the dam site is con- trolled by the City of Victor and hunting, fishing and recreation in the reservoir is proh i bited. The HEC-1 "Flood Hydrograph Package" (Reference 1) was used to model the East Fork Basin. This model was developed by the U.S. Army Corps of Engineers (COE) and is designed to simulate surface runoff response to basin precipitation. The model has the capabi 1 ity of routing through stream channel s and reservoirs. The HEC-1 model was prepared to evaluate both the Probable Maximum Flood (PMF) and the 100- year storm event. Rainfall data obtained for the Probable Maximum Precipitation (PMP) was determined from Hydrometeorological Report No. 55 (Reference 2). Two types of storms were evaluated for the PMF. They include both the general-type storm and the local 31