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<br />o <br />c..) <br />N <br />:.~~...J <br />(-:j <br />l\:) <br /> <br />between June 27 and September 30. Since the entire HUP was needed to meet the needs of the <br />HUP beneficiaries this year, there was no declaration of HUP surplus water to support the target <br />flows in the 15-Mile Reach or the Grand Valley Power Plant. Together. the releases for HUP <br />beneficiaries downstream of Green Mountain and to suppon the Cameo call totaled 58,602 acre- <br />feet. In addition, there were 706 acre-feet of evaporation from the HUP and 210 acre-feet of <br />depletions by HUP beneficiaries upstream of Green Mountain this year. resulting in an HUP <br />balance of 6,482 acre-feet on November I. <br /> <br />The dry conditions over the region were reflected in the low storage volumes and stream flows <br />recorded forthe Water Year. A good example of the precarious situation was the measured flows at <br />the Dotsero gage. The volume of water that passed through that location during Water Year 2002 <br />only totaled 672,200 acre-feet, one of the lowest ever observed at that location. The 30-year average <br />for that location is 1,578,970 acre-feet. <br /> <br />The total 2002 Water Year un depleted inflow at Green Mountain was 176,300 acre-feel, less than <br />half the 3D-year average of395,600 acre-feet. Blue River, Dillon Reservoir. and Green Mountain <br />Reservoir operations for Water Year 2002 are summarized in table 2. <br /> <br />Gross generation at the Green Mountain PowerPlant totaled 24,800.000 kilowatt-hours for Water <br />Year 2002,42 % of the 3D-year average. <br /> <br />Willow Creek Reservoir <br /> <br />Completed in 1953, Willow Creek Reservoir has a total storage capacity of 10,600 acre-feet. The <br />uncontrolled spillway, located at the left abutment, has a capacity of3,200 ft3/s. The Willow Creek <br />Feeder Canal begins at the left abutment with a capacity of 400 fills for pumping to Granby <br />Reservoir. <br /> <br />Reservoir carryover storage coming into Water Year 2003 was 9,777 acre-feet, 887 acre-feet higher <br />than the 3D-year average. <br /> <br />Similar to the conditions over the Green Mountain Reservoir watershed, the February I snow-water <br />content for the Willow Creek Reservoir watershed was only S5 % of average. This resulted in an <br />April-July most-probable-runoff forecast of only 32.000 acre-feet. which is 16.000 acre-feet below <br />the average most-probable forecast. However, inflow into Willow Creek Reservoir was average <br />during the winter months, but extremely low during the runoff season. when compared to the 3D-year <br />averages. Total inflow for the entire Water Year was only 15,600 acre-feet. less than one halfofthe <br />expected volume, and the lowest in C-BT history. Thc 3D-year average inflow for Willow Creek <br />Reservoir is 59,910 acre-feet. <br /> <br />The peak daily inflow for the Water Year was reported on May 24, a daily average of74 ft3/S. To <br />illustrate the severity of the situation, by comparison, records from Water Year 2001 report a peak <br />daily average inflow of 409 ft3/s. Water Year 2001 was one of the ~riest on record for the area. <br /> <br />Pumping from Willow Creek into Granby Reservoir was very limited during Water Year 2002. <br /> <br />9 <br />