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<br />Water Year 1988 <br /> <br />Lake Powell begins the water year at elevation 3,687.9 feet <br />with an active content of 23,1 MAF (92.4 percent full), The <br />plan of operation through December is to maintain releases <br />at about 40 percent of maximum powerplant capacity, <br />Beginning in January, assuming a most probable unregulated <br />runoff water year of 12.4 MAF, discharges from the <br />powerplant would be increased to average 55 percent of <br />capacity through February, lowering to about 40 percent of <br />capacity during the months of March through June, The <br />months of July through September would be operated for <br />power and recreation demands with discharges at 65 percent <br />of powerplant capacity, Total discharges for the water year <br />would be 11.2 MAF. <br /> <br />Under a probable maximum inflow (upper decile), tbe <br />operation for October through December is the same as for <br />the most probable inflow, For January through March, <br />releases would average 62 percent of maximum powerplant <br />capacity and increase to 85 percent of capacity for April <br />through July. Powerplant releases would then be lowered to <br />about 70 percent capacity for the remaining water year, Total <br />water year rekases of 15.5 MAF based on a unregulated <br />inflow of 17,7 MAF would be required to fill Lake Powell <br />during the month of July, A reasonable minimum level of <br />inflow would produce an annual release of 8,2 MAF based on <br />a unregulated inflow volume of 7,9 MAF, <br /> <br />The actual releases from Lake Powell after January 1, 1988, <br />will be reevaluated based upon runoff forecasts reflecting <br />current hydrologic conditions. It is expected that powerplant <br />bypasses will be avoided in all three operating plans. <br /> <br />LAKE POWELL STORAGE <br /> <br />1,000,001) ACRE..f:EET <br />II <br /> <br /> <br />110 N D J ~ YAM J J A SON g J , M A M J ~ A . <br />ACTUAL 1987 AND PROJECTED 1988 <br /> <br />14 <br /> <br />PROJECTED OPERATION 19B8 <br />REASONABLE MAXIMUM RELEASES <br /> <br />toOO CFB <br />o. <br /> <br />30 <br /> <br />........... <br />....--IIIIlll... <br />. ~.I ~. <br />If ,. <br />- <br />... <br /> <br />3. <br /> <br />10 <br /> <br />,. <br /> <br />10 <br /> <br />. <br /> <br />o <br /> <br />MOST PROBABLE RELEASES <br /> <br />S. <br /> <br />so <br /> <br /> <br />REASONABLE MINIMUM RELEASES <br /> <br />SI <br /> <br />eo <br /> <br />II <br /> <br /> <br />I. <br /> <br />,. <br /> <br />. <br /> <br />NDJFMAMJJASO <br />