Difference between revisions of "GCDAMP Glen Canyon Dam"
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The [http://ltempeis.anl.gov/documents/docs/LTEMP_ROD.pdf '''LTEMP Record of Decision (ROD)'''] on the operation of Glen Canyon Dam was signed on December 15, 2016. It changed operations at Glen Canyon from the 1996 ROD that implemented the MLFF flow regime. A new operating criteria for Glen Canyon Dam was signed on ''XX-XX-XXXX''. | The [http://ltempeis.anl.gov/documents/docs/LTEMP_ROD.pdf '''LTEMP Record of Decision (ROD)'''] on the operation of Glen Canyon Dam was signed on December 15, 2016. It changed operations at Glen Canyon from the 1996 ROD that implemented the MLFF flow regime. A new operating criteria for Glen Canyon Dam was signed on ''XX-XX-XXXX''. | ||
− | According to the [http://gcdamp.com/index.php?title=Long-term_Experimental_and_Management_Plan_(LTEMP) '''LTEMP EIS'''], minimum flows of 8,000 cubic feet per second (cfs) during the day and 5,000 cfs at night, maximum daily change limitation of 8,000 cfs, and maximum flows of 25,000 cfs were carried forward from MLFF. The upramp limit remains at 4,000 cfs/hr while the downramp limit was increased from 1,500 cfs/hr to 2,500 cfs/hr. The LTEMP replaced the tiered limit on daily fluctuations from 6,000 cfs in 600,000 af months and 8,000 cfs in 800,000 af months to a proportional scale in which the daily fluctuations in June, July, and August are calculated to be 10% of the monthly volume (i.e. a month with a volume of 750,000 af would fluctuate 7,500 cfs/day). All other months use a daily fluctuation factor of of 9% (i.e. a month with a volume of 750,000 af would fluctuate 6,750 cfs/day). | + | According to the [http://gcdamp.com/index.php?title=Long-term_Experimental_and_Management_Plan_(LTEMP) '''LTEMP EIS'''], minimum flows of 8,000 cubic feet per second (cfs) during the day and 5,000 cfs at night, maximum daily change limitation of 8,000 cfs, and maximum flows of 25,000 cfs were carried forward from MLFF. The upramp limit remains at 4,000 cfs/hr while the downramp limit was increased from 1,500 cfs/hr to 2,500 cfs/hr. The LTEMP replaced the tiered limit on daily fluctuations from 6,000 cfs in 600,000 af months and 8,000 cfs in 800,000 af months to a proportional scale in which the daily fluctuations in June, July, and August are calculated to be 10% of the monthly volume (i.e. a month with a volume of 750,000 af would fluctuate 7,500 cfs/day). All other months use a daily fluctuation factor of of 9% (i.e. a month with a volume of 750,000 af would fluctuate 6,750 cfs/day).[http://ltempeis.anl.gov/documents/final-eis/] |
== '''Operating tier for WY2017''' == | == '''Operating tier for WY2017''' == |
Revision as of 15:13, 16 March 2017
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Operations of Glen Canyon DamThe LTEMP Record of Decision (ROD) on the operation of Glen Canyon Dam was signed on December 15, 2016. It changed operations at Glen Canyon from the 1996 ROD that implemented the MLFF flow regime. A new operating criteria for Glen Canyon Dam was signed on XX-XX-XXXX. According to the LTEMP EIS, minimum flows of 8,000 cubic feet per second (cfs) during the day and 5,000 cfs at night, maximum daily change limitation of 8,000 cfs, and maximum flows of 25,000 cfs were carried forward from MLFF. The upramp limit remains at 4,000 cfs/hr while the downramp limit was increased from 1,500 cfs/hr to 2,500 cfs/hr. The LTEMP replaced the tiered limit on daily fluctuations from 6,000 cfs in 600,000 af months and 8,000 cfs in 800,000 af months to a proportional scale in which the daily fluctuations in June, July, and August are calculated to be 10% of the monthly volume (i.e. a month with a volume of 750,000 af would fluctuate 7,500 cfs/day). All other months use a daily fluctuation factor of of 9% (i.e. a month with a volume of 750,000 af would fluctuate 6,750 cfs/day).[1] Operating tier for WY2017The operating tier for water year 2017, established in August 2016, is the Upper Elevation Balancing Tier, with an initial water year release volume of 8.23 maf and the potential for an April 2017 adjustment to equalization or balancing releases. Based on the current forecast, an April adjustment to balancing releases is projected to occur and Lake Powell is currently projected to release 9.0 maf in water year 2017. This projection will be updated each month throughout the water year. [2] |
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