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Last modified
1/26/2010 2:52:27 PM
Creation date
10/12/2006 3:33:48 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8441.700
Description
Colorado Big Thompson Project - Annual Operating Plans
Basin
South Platte
Water Division
1
Date
1/1/1998
Title
Annual Operating Plans - Colorado Big Thompson Project and Western Division System Power Operations - Water Year 1998 Summary of Actual Operations
Water Supply Pro - Doc Type
Report/Study
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<br />WATER YEAR 1998 OPERATIONS <br /> <br />o <br /><::> <br />~ <br />c:p <br />~ <br />-..} <br /> <br />Green Mountain Reservoir <br /> <br />Green Mountain Reservoir and Power plant, completed in 1943, are located on the Blue River on <br />Colorado's western slope. The reservoir with a total capacity of 154,645 acre-feet provides storage water <br />releases for power production, replacement of out of priority depletions, and contract water deliveries. <br /> <br />The power plant has two units with a total installed capacity of26 megawatts. The spillway located on the <br />left abutment is controlled by three 25 x 22 foot radial gates and has a total release capability of <br />25,000 ft%. <br /> <br />Reservoir storage coming into water year 1998 was high at 138,200 acre-feet, compared to the average <br />September 30 storage of 127,233 acre-feet. <br /> <br />Colorado River native flows were above. average during October averaging 1,727 ft3 Is at the Dotsero gage. <br />This flow was adequate to meet downstream water user demands and resulted in no need for natural flow <br />shortage releases from Green Mountain Reservoir to meet the needs at the Cameo gage during October. <br />Turbine releases averaged 294 fels during October. <br /> <br />The turbines releases averaged 201 ft3/s during November. Winterturbine releases (December through <br />January) were higher, averaging 482 ft3/s to meet replacement requirements, bypass of inflow, power <br />production, and the desired end-of-January storage position. <br /> <br />The end of January storage for Dillon Reservoir was 250,900 acre-feet, 12,800 acre-feet higher than the <br />previous year and 115 percent of average (217,686 acre-feet). <br /> <br />The October-January precipitation was above average at 128 percent of the 1966-1995 average, and the <br />February I snow-pack data was recorded at 100 percent of average. . <br /> <br />The February 1 forecast of the April-July runoff volume totaled 290,000 acre-feet, . which was <br />106 percent of average. Reservoir storage continued to stay above average during February, while the <br />releases averaged 495 fe Is. Precipitation for February was below average at 88 percent of the 1966-1995 <br />average. <br /> <br />Snowpack reported was below average in March. Snow water content was reported at 92 percent of <br />average and precipitation at 98 percent of average. March inflow was 130 percent of average. Turbine <br />releases continued at a rate of 495 fels during March due to the high inflow and above average storage <br />volume. <br /> <br />During April, the snow-pack diminished slightly, down to 91 percent. The May-July water supply <br />forecast dropped from 275,000 acre-feet to 260,000 acre-feet, which was 101 percent of average. <br />Precipitation for the watershed was reported at 104 percent of average, yet April inflows were low at 91 <br />percent of average. Releases remained at a constant flow of 500 fe Is until April 21. At that point, flow <br />was reduced to 250 ft3 Is. <br /> <br />7 <br />
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