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<br />/ o~ <br /> <br />to deliver water to the lower basin, but It would also reduce the amount of water <br /> <br />available for use In the upper basIn by at least 300,000 acre-feet per year, --" <br /> <br />is s imply not true. <br /> <br />(2) Dr. Guadagno mentioned that as well as depending upon pressure <br /> <br />head. the productIon of power also depends upon the amount of water flowing <br /> <br />through the turbines. If Lake Powell is forced to be held below elevation <br /> <br />3600 feet, all of the loss in electric generation and power revenues is not <br /> <br />attributable to loss of head resultIng from operating the reservoir to elevation <br /> <br />3600 versus elevation 3700 feet. Part of the loss would be due to the doctor's <br /> <br />own point that the water must run through the turbines to generate energy, but <br /> <br />during some years water would have to by-pass the turbines because of their <br /> <br />limited capacity in order to keep the water under elevation 3600 feet. (Two- <br /> <br />thirds of the annual runoff occurs during the Aprll- July period.) Whenever the <br /> <br />water surface dropped below elevation 3570 feet, only 30 feet under elevation <br /> <br />3600 feet, the power generating capability of the generators would be impaired. <br /> <br />When it dropped below 3490 feet, power generation would cease entirely. The <br /> <br />amount of space between elevations 3490 feet and 3600 feet represents only <br /> <br />approximately 8 million acre-feet compared to about 21 millIon acre-feet between <br /> <br />elevation 3490 and 3700 feet. <br /> <br />The water representIng the average dIfference in evaporation loss of <br /> <br />180,000 acre- feet between operating at 3600 feet Instead of 3700 feet (not <br /> <br />30r),000 ar:re- feet a.s the doctor stated 110uld be gone <br /> <br />downstreamanct could not he returned for use in Colorado and her sister Upper <br /> <br />Basin States if the reservoIr were operated not to exceed elevation 3600 feet. <br /> <br />9 <br />