Laserfiche WebLink
<br />002JJ7 <br /> <br />Initial Information Package <br />Williams Fork Hydroelectric Project <br />FERC Project No. 2204 <br /> <br />TAILRACE <br />The powerhouse and river outlets combine in the tailrace or outflow <br />channel, formed by the rock of the streambed excavated beyond the dam. <br />The tailrace discharges into the Williams Fork River. <br /> <br />RESERVOIR <br />Williams Fork Reservoir, near the north end of the Williams Fork <br />Drainage Basin, is located near the intersection of 106 degrees west <br />longitude and 40 degrees north latitude. The drainage basin is 230 square <br />miles in area and ranges in elevation from about 7,800 feet to 13,000 feet. <br />On average, 30 inches of precipitation falls in the upper Williams Fork <br />basin every year. Nearly all of the streamflow in the basin originates from <br />snowmelt. Approximately 60 percent of the precipitation eventually ends <br />up as surface streamflow. <br /> <br />The reservoir has approximately 15 miles of shoreline. The maximum <br />depth of the reservoir is 181 feet when the reservoir is at elevation 7,811 <br />feet. It has a maximum surface area of approximately 1,628 acres and <br />contains 96,822 acre-feet of storage. <br /> <br />TuRBINE/GENERATOR <br />The powerhouse contains one vertical-axis, 4,250 Horsepower (Hp), <br />Francis turbine that drives a generator rated at 3158 KV A, 0.95 Power <br />Factor (PF), under a net head of 192 feet. The turbine wicket gates are <br />controlled using a servomotor and hydraulic governor system. Governor <br />oil pressure is supplied with dual pumps mounted on a hydraulic power <br />unit (HPU). At a maximum head of 192 feet, the turbine discharges 220 <br />cfs. <br /> <br />In 2001, the hydro turbine equipment was refurbished. The work <br />consisted of furnishing and installing a more efficient runner, new wicket <br />gates, bushings, and other associated parts. Performance curves for the <br />new runner are shown in Figure 3.1.1.- <br />14 <br />