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. SIXTH WATER PUMPED STORAGE PLAN Pumped Storage has to do with a method of "storing" energy for use when it is needed most. In hydroelectric systems it involves two reservoirs. During the day, when the need for electric power is high, water flows from the upper reservoir through a generating plant into the lower reservoir. During the night, the water is pumped from the lower reser- voir into the upper reservoir and the cycle is ready to start again the next day. On the surface this may seem like "perpetual motion," but in reality It takes more energy to pump the water up than is generated when the wafer runs down. In a typical system it may take 4 kilowatt-hours of energy to pump enough water to generate 3 kilowatt-hours of electricity. If this is the case one may ask, why consider pumped storage? The answer lies in the economics of the situation. The power generated during the day can be "sold" for more (perhaps as much as two or three times more) than it costs to "buy" electricity during the night for pumping. Thus, even though it uses more energy than it generates, pumped storage can be an Figure No.2 economical way to provide electricity when it is needed most. In fact. there are many pumped storage facilities in operation throughout the world. The Sixth Water Pumped Storage Plan has basically the same features and alinement as the Sixth Water Flow Through Plan except that Monks Hollow Dam would replace Hayes Dam as shown in Figure No.2. Also, water destined for Utah Lake would not be released into the river, but would be carried in the Diamond Fork Pipeline down to the mouth of Diamond Fork Canyon. This pipeline would remove a portion of the excessive flows under existing conditions for the purpose of enhancing trout habitat in Diamond Fork River. From here it would pass through the Diamond Fork Powerplant before being divided into the Wasatch Aqueduct and Spanish Fork River. With this alternative, the Dyne and Sixth Water Powerplants would be pumped stor- age plants. For this reason, the size of some of the other features is different from the Sixth Water Flow Through Plan (see Figure No.2). Pump Storage Sixth Water Alternative /If. ~ , -t- A conl?" ~\j. Feature Size J Syar Tunnel - 9.5 foot diameter, 6.5 miles long Syar Powerplant - 15.6 megawatts Syar Reservoir - 45 acres, 3030 acre-feet Syar Dam - 108 feet high Corona Aqueduct - 17 foot diameter, 1 mile long Sixth Water Powerplant - 192 megawatts Sixth Water reservoir - 20 acres, 620 acre-feet Sixth Water Dam - 125 feet high Dyne Aqueduct - 17 foot diameter, 2.5 miles long Dyne Powerplant - 192 megawatts Monks Hollow Reservoir - 360 acres, 31 ,400 acre-feet Monks Hollow Dam - 250 feet high Diamond Fork Pipeline - 6 foot diameter, 7.0 miles long Diamond Fork Powerplant - 6 megawatts.