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<br />n f' ~, " (\ C'\ <br />uo0 c..... "J <br /> <br />. <br /> <br />SUMMARY--PIEDRA RIVER POWER DEVELOPMENT <br /> <br />PLAN OF DEVELOPMENT <br /> <br />. <br /> <br />The First Box Reservoir o~ 74,000 acre-~oot capacity (30,000 acre- <br />~oot active) would be formed by a dam 280 feet high on Piedra <br />River 1 mile below the mouth of First Fork. Releases from the <br />reservoir would pass through the First Box powerplant at the base <br />of the dam. About 1.5 miles farther downstream the water would <br />be diverted into a t\lDDel 2,900 feet long from which it would <br />enter a :penstock and descend a vertical distance of 90 feet to <br />the Dudley powerplant, also on Piedra River. An afterbay below <br />the Dudley plant would reregulate the water on a daily basis to <br />avoid interference with downstream irrigation. Project trans- <br />mission lines would connect the powerplants with an existing <br />system near Durango, Colo. Additional upstream flow regulation <br />for the :power system would be provided by the potential Wem.inucbe <br />Reservoir of 41,000 acre-foot capacity on Weminuche Creek, a trib- <br />utary of Piedra River. A feeder canal 3.8 miles long would divert <br />flows o~ Williams Creek, another tributary, to the Weminucbe <br />Reservoir. In estimating the water supply available for power <br />generation, no allowance was made for depletion that would result <br />from the O'Neal Park project or any other future upstream <br />development. <br /> <br />POIlER MID ENERGY <br /> <br />The installed generating capacity would be 5,500 kilowatts at <br />the First Box powerplll.llt and 2,000 kilowatts at the Dudley <br />powerplant. Saleable energy from the two plants would average <br />40,000,000\ kilowatt-hours annuall)-, of which 31,000,000 <br />kilowatt-hours would be firm. <br /> <br />COSTS MID REPAYMENT <br /> <br />Construction costs, including interest during construction, are <br />estimated at $8,500,000. Annual operation, maintenance, ll.lld <br />replacement costs are estimated at $84,000. In order to pay <br />the latter costs and amortize the construction cost in a 50- <br />year period with interest at 2.5 percent, firm project energy <br />would have to be sold at 11. 7 mills per kilowatt-hour and <br />secondary energy at 2.5 mills per kilowatt-hour. <br /> <br />BENEFIT-COST RATIO <br /> <br />. <br /> <br />0.86 to 1 <br /> <br />2 <br />