WSP00886 - Laserfiche WebLink

Home Browse Search

22 I I I I I I I I I I I I I I I I I I I Reasonable Maximum Inflow Forecast Colorado-Big Thompson PrOject Green Mountain Reservoir With a reasonable maximum inflow forecast, releases from Green Mountain Reservoir for bypass of inflow, replacement, power, and river and reservoir regulation will average 170 ft3/s in February and March and will be increased in April to near 475 ft3/s after ice conditions permit to reduce the storage content to 55,000 acre-feet by April 30. Releases for power will be increased, as required, from May through July to allow the reservoir to fill without spilling in early July. June and July releases are expected to average near 1,425 ft3/s. The reservoir will remain nearly full throughout the remainder of the water year. With reasonable maximum runoff, it is estimated that the cities of Colorado Springs and Denver would not deplete the Blue River during Apri l-September, whi ch wou 1 d not cause any power interference at Green Mountain Powerplant. Willow Creek Reservoir Willow Creek Reservoir storage would reach the maximum reservoir capacity of 10,200 acre-feet by the end of June. With above-average storage in Granby and a reasonable maximum forecast, 67,500 acre-feet of water would be pumped to Granby during the April-July runoff period. Approx imately 6,700 acre-feet. of water for requ ired i rri gat i on requi rements and fi shery augmentat i on flows wou 1 d be bypassed to the river during April-July. Reservoir storage would be near 9,000 acre-feet at the end of the water year. Lake Granby Storage in Lake Granby will drop to a minimum of about 134,100 acre-feet by the end of March. Thereafter, Lake Granby storage will fi 11 to 417,900 acre-feet by the end of July which is 121,900 acre-feet below the maximum reservoir capacity of 539,800 acre-feet. Reservoir storage of 409,700 acre-feet at the end of the water year would be near the 3D-year average of 419,500 acre-feet. East Slope/Colorado-Big Thompson Project With reasonable maximum runoff forecast on February 1, below-average supplemental irrigation demands equal to 162,800 acre-feet will be expected on the Project during water year 1990. Diversions through Adams Tunnel wi 11 be at capacity of 550 ft3/s from February 1 through March 20. Adams Tunnel and Olympus Tunnel diversions will be minimized from March 21 through April 28 to accommodate the Pole Hill Canal, Afterbay, and Powerplant maintenance scheduled during this period. For May through September, Adams Tunnel diversions will be scheduled to maximize the diversion of available "skim" water and meet irri9ation demands on the east slope. Approximately 7,500 acre-feet of available skim water would b,e bypassed during June because Olympus Tunnel is at capacity of 550 ft3/s.