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II I I I I I I I I I I I I I I I I I I 0"""~'77 lJ'~L.v~ ANNUAL OPERATING PLAN AFTER FEBRUARY 1 Most Probable Inflow Forecast Colorado-BiQ Thomoson Project Green Mountain Reservoir Turbine releases for replacement, bypass of inflow, power, and reservoir regulation will approximate 174 ft3/s during February and March. If most probable runoff conditions develop, releases will be increased to near 187 ft3/s during April to achieve the desired storage target of 65,000 acre-feet at the end of April. As the reservoir fills during the May-July runoff period, releases will be adjusted to achieve a fill without spill during the early part of July. With normal inflow and near-average releases for downstream water users duri ng August and September, storage is projected to be about . 135,000 acre-feet by the end of September. With most probable runoff conditions, Denver and Colorado Springs' Blue Ri ver depl et ions are projected to be about 52,200 acre-feet duri ng the February-September peri od. These depl et ions would cause about 12 gagawatt-hours of power interference at Green Mountain Powerplant. Willow Creek Reservoir Under the most probable conditions, Willow Creek Reservoir will fill to about 10,000 acre-feet by the end of June. The minimum required releases of 7 ft3/s to the river during February, March, and April, 24 ft3/s during May, and 44 ft3/ S duri ng June wi 11 be ma i nta i ned. Duri ng Apri 1 through September, approximately 45,600 acre-feet will be pumped to Lake Granby. While maintaining the required river release for downstream water rights, Willow Creek storage will be near 9,000 acre-feet at the end of the water year. Lake Granbv Lake Granby storage will be lowered to 183,600 acre-feet by the end of March. With most probable inflow, storage is expected to reach 350,800 acre-feet by the end of July. This is 189,000 acre-feet below maximum reservoir storage and 80 percent of average. Granby Reservoir content of about 324,300 acre-feet at the end of the water year will be 78 percent of average. East Slooe - Colorado-BiQ Thomoson Proiect If climatic conditions produce most probable inflow, a near normal supplemental irrigation demand equal to 222,400 acre-feet would be expected on the Project. Adams Tunnel diversions will be near capacity during February, averaging 490 ft3/s due to power demands and terminal reservoir storage targets. 21