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Last modified
1/26/2010 4:34:15 PM
Creation date
3/25/2008 3:17:38 PM
Metadata
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Template:
Water Supply Protection
File Number
8282.600.40
Description
Colorado River AOP Status Report
Basin
Colorado Mainstem
Author
USDOI/BOR
Title
Colorado River Reservoir Operations Status Reports Partial Part 1 2005, with staff comments
Water Supply Pro - Doc Type
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<br />... <br /> <br />These meetings are open forum discussions on the Aspinall Unit reservoir operations with many <br />interested groups participating. Anyone needing further information about these meetings should <br />contact Dan Crabtree in the Grand Junction Area Office at (970) 248-0652. <br /> <br />NA V AJO - Based on the April spring runoff forecast for Navajo Reservoir, Reclamation will <br />begin increasing the releases from the reservoir in late April. Releases are expected to remain at 500 <br />cubic feet per second (cfs) until then. The spring release pattern and magnitude will follow the <br />recommendations provided for by the San Juan River Basin Recovery Implementation Program <br />(SJRlP) Flow Recommendations for Endangered Fish. Even with the scheduled high releases, the <br />reservoir is expected to fill this year, <br /> <br />Reservoir operating rules - which take into account the current storage level of the reservoir, the <br />projected inflow into the reservoir, and the estimated demand for the year - call for the maximum <br />release pattern to be implemented, This correlates to a maximum release of 5,000 cfs from the <br />reservoir for 21 consecutive days, with a ramp up and ramp down period. The purpose of this release <br />design is to better mimic natural (pre-dam) runoff conditions. <br /> <br />Reclamation will begin ramping up on April 27, 2005. The initial ramp up will consist of an increase <br />of 500 cfs over a one-day period, then holding at that rate (1,000 cfs) for a week, followed by a one- <br />day increase of 1,000 cfs, and holding at that rate (2,000 cfs) for another week. Subsequent 1,000 cfs <br />increases will be made weekly until a maximum release of5,000 cfs is reached on May 25,2005. <br />Releases will remain at 5,000 cfs until June 15,2005, at which time releases will be ramped down <br />over a two-week period. Releases are expected to be back to the base summer release on <br />approximately June 29, 2005. The base summer release will not be less than 350 cfs, and may be <br />higher depending on the reservoir storage level at that time. <br /> <br />It should be noted that this scheduled release pattern is based on the April 2005 forecast. The <br />proposed release plan will be updated as inflow forecasts are updated. A change in weather patterns <br />could impact the final release pattern. Also, adjustments may be made to the releases if significant <br />precipitation occurs during the scheduled release period. As such, this release plan is subject to <br />change, The public will be notified once the spring release is finalized. Reclamation will continue to <br />closely monitor the hydrologic conditions in the basin. As such, this scheduled release change is <br />subject to changes in river flows and weather conditions. <br /> <br />The current hydrologic conditions continue to be wet. As of April 4, 2005, the upper San Juan basin <br />snowpack stood at 150 percent of average and 141 percent of average for the Animas River basin. <br />Precipitation for the month of March was recorded at 90 percent of average, which resulted in about <br />normal inflow into Navajo Reservoir for March, Unregulated inflow was 89,000 acre-feet, or 100 <br />percent of average for March. This raised the elevation of the reservoir 7.05 feet during the <br />month. Currently, the daily reservoir inflow is averaging about 1,800 cfs and reservoir releases are <br />set at 500 cfs. The reservoir water surface elevation is 6046.76 feet, which corresponds to a storage <br />content of about 1,188,000 acre-feet. <br /> <br />On April 4, 2005, the National Weather Service's River Forecast Center issued an updated <br />unregulated inflow forecast for Navajo Reservoir for the April through July runoff period. This <br />forecast is projecting a volume runoff into the reservoir of 1,320,000 acre-feet, which represents a <br />165 percent of normal runoff for the upper San Juan Basin. The reservoir is projected to fill, while <br />also providing the maximum spring release rates (21 days at 5,000 cfs) for endangered fish as <br />determined by the Flow Recommendations. There would be no shortages to Navajo Reservoir water <br />contract users using this forecast. <br />
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