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Last modified
1/26/2010 12:32:12 PM
Creation date
10/11/2006 10:36:24 PM
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
1/1/2002
Title
Annual Operating Plans - Colorado Big Thompson Project and Western Division System Power Operations - Calendar Year 2002 Summary of Actual Operations and Calendar Year 2003 Annual Operating Plans
Water Supply Pro - Doc Type
Report/Study
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<br />7910.73 feet by June 20, with a storage volume of 84,787 acre-feel. That low volume was more <br />than :;7,000 acre-feet less than the minimum-probable-runoff condition forecasted. <br /> <br />o <br />o <br />N <br />c <br /> <br />~ <br /> <br />Depleted inflow for the year at Green Mountain Reservoir peaked at 555 ft3/s on June I. 2\J0:;. <br />Releases from Green Mountain remained at the minimum flow of approximately 60 ft3 Is between <br />early May and the middle of June. After June 20, releases were increased, in order to satisfy the <br />water demands from senior water rights holders. Immediately after June 20 the water surface <br />level began to drop. <br /> <br />c' <br /> <br />Dillon Reservoir, a Denver Water Reservoir upstream of Green Mountain, spilled for only a few days <br />during Water Year 2002. That spill occurred in October, 2001. Due to the on-going drought, that <br />reservoir never reached full capacity. On the eontrary, its content continued to diminish throughout <br />the entire Water Year. Its maximum water surface level for the Water Year was reported on October <br />1,2001 at 9,01 I .89 feet above sea level. Maximum discharges into the river were reported between <br />October I and October 6; a flow of 161 ft3/S. Total volume of water spilled for the Water Year was <br />less than 2,500 acre-feet. Releases for the Water Year totaled 51,900 acre-feet, the lowest total since <br />Water Year 1981. Required releases from Dillon were substituted with releases from Williams Fork <br />and Wolford reservoirs throughout the year. Therefore. Dillon releases were mostly kept to a <br />minimum. This type of operation affected Green Mountain Reservoir elevations because inflows <br />were lower than expected. Dillon Reservoir ended the Water Year at a storage level of I 52,668 acre- <br />feet. The 30-year average for the end-of-the-year storage content is 237,390 acre-feet. <br /> <br />Due to the extremely dry conditions, the Green Mountain Reservoir achieved a maximum <br />content for the year of 84,745 acre-feet on June 19. approximately 68,900 acre-feet short of a <br />physical fill. In fact, even with the 32,886 acre-feet of substitution water owed to Green <br />Mountain by Denver Water and the City of Colorado Springs for out-of-priority diversions, <br />Green Mountain fell approximately 29,700 acre-feet short of achieving a "paper" ftll. The <br />substitution water was paid back this year by a combination of releases from Williams Fork <br />Reservoir, Wolford Mountain Reservoir, and from Ruedi Reservoir through an exchange with <br />Wolford Mountain Reservoir. The physical water in Green Mountain in combination with the <br />substitution water was sufficient to fill the 52,000 acre-foot Colorado-Big Thompson Project <br />replacement pool, the 5,000 acre-foot Silt Project replacement pool, and the 66,000 acre-foot <br />HUP. However, due to the large "paper" fill deficit, there was no water available for Green <br />Mountain contractors this year. <br /> <br />Landslide concerns resulted in a restriction requiring Green Mountain Reservoir's water surface <br />elevation to remain above 7850.0 feet (27,000 acre-feet), effectively "stranding" 20,000 acre-feet <br />of HUP water in the reservoir. This loss of water was mitigated through a lease making up to <br />10,000 acre-feet of Ruedi Reservoir water available as HUP water and an agreement that 10,000 <br />acre-feet of the "stranded" water would be considered to be from the 52,000 acre-foot Colorado- <br />Big Thompson Project replacement pool. <br /> <br />Releases to satisfy the water rights of HUP beneficiaries downstream of Green Mountain began <br />on. :->rilI2, with a total of21,985 acre-feet being released for that purpose between April 12 and <br />September 24. Major conservation efforts by the Grand Valley irrigators resulted in only <br />requiring 36,617 acre-feet of water to be released from the HUP to support the Cameo call <br /> <br />8 <br />
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