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<br />total of26 gigawatt-hours of electric energy. Water deliveries remained low between October and May.
<br />By the beginning of June, deliveries were increased dramatically, as the irrigation season began. Water
<br />surface levels began to fall rapidly, as pumping continued throughout the summer months. By
<br />o September 30, 1998, the reservoir had reached its lowest storage volume of the year, 64,028 acre-feet,
<br />.::> with a water surface level of 5,713.00 feet.
<br />...
<br />
<br />~ Due to the dry conditions during the year, the volume of priority water was very small for the water year.
<br />~. A total of 2,535 acre-feet of priority water were pumped to Carter Lake during water year 98. This east
<br />slope priority water was similar to skim in that it was diverted at Olympus Tunnel like skim and used
<br />through the power system. However, it was never returned to the Big Thompson River. The surplus
<br />water was pumped to Carter Lake.
<br />
<br />Deliveries to the St.Vrain Su~ply Canal began March 30, but remained low until the middle of June,
<br />when they jumped from 20 ft Is to over 480 ft3 Is. The total volume of the deliveries for the month of
<br />June was 13,356 acre-feet, with 25,800 acre-feet in July, 10,800 in August, and 12,300 in September.
<br />These volumes include metered delivery. Deliveries during July and September were higher than the
<br />respective 30-year averages. Water year deliveries to the St. Vrain Supply Canal totaled
<br />78,100 acre-feet, well above the 30-year average of 67,510 acre-feet. .
<br />
<br />Flatiron Unit 3 was used for power generation only during July. A total of 500 acre-feet were used for
<br />generation that month.
<br />
<br />Horsetooth Reservoir
<br />
<br />Completed in 1949, with four dams, Horsetooth Reservoir has a total constructed capacity 0[156,700
<br />acre-feet. Inflow of Project water is from Flatiron Reservoir via the Charles Hansen Feeder Canal.
<br />
<br />Horsetooth Reservoir storage of 124,283 acre-feet at the start of water year 1998 was 45,473 acre-feet
<br />above the 1966-1995 average of78,81O acre-feet.
<br />
<br />Transfer of water to Horsetooth Reservoir continued during the water year, with only limited
<br />interruptions. The maximum storage volume obtained during water year 98 was 151,469 acre-feet,
<br />with a water surface elevation of 5,427.39 feet. This maximum level was reached on February 7.
<br />
<br />As with Carter Lake, irrigation deliveries from Horsetooth Reservoir along the Charles Hansen Supply
<br />Canal were relatively low throughout the water year until early May.
<br />But, by May 5, deliveries were increased from 15 ft% to over 1000 ft3/s. A total of 32,500 acre"feet
<br />were delivered in May, 12,200 acre-feet in June, 34,600 acre-feet in July, 14,600 acre-feet in August, and
<br />9,600 in September. Deliveries during May were 373 percent of the 30-year average. Irrigation
<br />deliveries continue slightly above average in June and July, only to drop to 5 I percent in August and 86 .
<br />percent in September. By the end of the water year, a total of 114,500 acre-feet had been delivered out
<br />of Horsetooth Reservoir, 18,360 acre-feet higher then the 30-year average.
<br />
<br />At the same time, water deliveries to the Dixon Canal we also high from May to September, sometimes
<br />surpassing the 200 percent of the 3D-year average. The months of May and September were particularly
<br />high, with deliveries as high as 240 and 218 percent of average, respectively.
<br />
<br />Horsetooth Reservoir finished the water year with 81,947 acre-feet of water in storage, which was 104
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