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Last modified
1/26/2010 12:13:34 PM
Creation date
10/11/2006 9:37:29 PM
Metadata
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Template:
Water Supply Protection
File Number
8282.600.40
Description
Colorado River Annual Operating Reports
Basin
Colorado Mainstem
Date
7/1/1999
Author
USDOI/BOR
Title
Colorado River Reservoir Operation Status Reports Part 2
Water Supply Pro - Doc Type
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<br />maintained until the reservoir reaches elevation 6077,0 feet, at which time we will reduce releases to <br />match daily average inflows. These reservoir elp.vation levels will provide additional storage in the <br />event of any large Fall rainstonn and also help prepare the reservoir for next Spring's snowmelt <br />runoff. <br /> <br />The current reservoir inflow is 2,300 cfs while releases are set at 4,400 cfs, The release rate will <br />drop to 3,000 cfs on September 13, and will most likely be reduced to average daily inflow during <br />the later part of the month. The reservoir elevation is 6079.56 feet, which corresponds to a reservoir <br />content of 1,618,000 acre-feet. <br /> <br />On August II, 1999, a meeting discussing the operation of Navajo Reservoir was held at the Bureau <br />of Reclamation's Farmington, New Mexico's office, At this meeting Reclamation officials presented <br />the alternatives for near tenn operation of the reservoir. It was discussed at length the best and safest <br />operation of the reservoir for all concerned. Reclamation plans to hold public meetings on Navajo <br />Reservoir operations annually in January, April, and August at varying locations. These are open <br />forum meetings and anyone interested in the general operation of the reservoir is encouraged to <br />attend. For funher infonnation about these meetings or the daily operations of Navajo Reservoir <br />please contact Rege Leach in Reclamation's Durango Office at (970) 385-6553. <br /> <br />Glen Canvon Dam - Inflow into Lake Powell this summer has been above average in response to a <br />very active summer monsoon, Unregulated inflow to Lake Powell in August was 1.17 million <br />acre-feet (192 percent of average). Because of this unusually high summer inflow, Lake Powell has <br />remained quite full throughout the summer. Lake Powell reached a peak elevation of 3694.7 feet <br />(5.3 feet from full) on July 16. Since this time, the lake elevation has only dropped 1.4 feet. The <br />current elevation of Lake Powell is 3693.3 feet. <br /> <br />Releases from Glen Canyon Dam during the remaiDder of September will be averaging about 19,000 <br />cfs, very close to the August release level. Fluctuations will generally vary between a low of about <br />14,000 cfs to a high of about 22,000 cfs, Releases will be lower on Sundays with the daily average <br />being about 17,000 cfs. On September 20 and 21, however, releases from Glen Canyon Dam will be <br />higher. Maintenance activities will take place these 2 days at Blue Mesa, Morrow Point, and Crystal <br />Dams (Aspinall Unit). The higher releases at Glen Canyon will make up for the lost generation <br />capacity at Aspinall Unit power plants, Releases from Glen Canyon Dam will be 25,000 cfs the <br />afternoon of September 20 and remain at this level until the evening hours of September 21. Unless <br />there are unexpected delays in the maintenance activities at the Aspinall Unit, -releases will return to <br />about 19,000 cfs on September 22. <br /> <br />Releases in October and November will likely be moderately lower than current releases. Under the <br />current operation plan, releases in October and November will average about 17,500 cfs, All power <br />plant releases at Glen Canyon will continue to be made according to the parameters of the Record of <br />Decision for the Glen Canyon Dam Final Environmental Impact Statement preferred alternative. <br /> <br />Inflow into Lake Powell during 1999 will be very close to average. Projected water year 1999 <br />unregulated inflow is 12,7 million acre-feet (108 percent of average). April through July represents <br />the runoff period in the Colorado River basin, This year's April through July unregulated inflow to <br />Lake Powell was 7.62 million acre-feet (99 percent of average). <br />
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