Difference between revisions of "Hydrology"
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| + | ==[http://www.usbr.gov/uc/water/crsp/cs/gcd.html '''Current Status''']== | ||
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| + | The unregulated inflow volume to Lake Powell in May was 2,294 thousand acre-feet (kaf) (98 percent of average). The release volume from Glen Canyon Dam in May was 700 kaf. The end of May elevation and storage of Lake Powell were 3,604 ft (96 feet from full pool) and 12.1 maf (50% of full capacity), respectively. The reservoir reached a seasonal low elevation on April 15th near elevation 3591.14 feet. Since that time the reservoir elevation has been increasing and will continue to increase throughout mid-summer as runoff from snowmelt and precipitation enter the reservoir. | ||
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| + | ==[http://www.usbr.gov/uc/water/crsp/cs/gcd.html '''Inflow Forecasts and Model Projections''']== | ||
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| + | The operating tier for water year 2016 was established in August 2015 as the Upper Elevation Balancing Tier. The April 2016 24-Month Study established that Lake Powell operations will be governed by balancing for the remainder of water year 2016. Under balancing, the contents of Lake Powell and Lake Mead will be balanced by the end of the water year, but not more than 9.0 maf and not less than 8.23 maf shall be released from Lake Powell. Based on the most probable inflow forecast, this June 24-Month Study projects a balancing release of 9.0 maf in water year 2016; the actual release in water year 2016, however, will depend on hydrology in the remainder of water year and will range from 8.23 to 9.0 maf. The projected release from Lake Powell in water year 2016 will be updated each month throughout the remainder of the water year. Reclamation will schedule operations at Glen Canyon Dam to achieve as practicably as possible the appropriate total annual release volume by September 30, 2016. | ||
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| + | In June, the release volume will be approximately 800 kaf, with fluctuations anticipated between about 9,000 cfs in the nighttime to about 17,000 cfs in the daytime and consistent with the Glen Canyon Operating Criteria (Federal Register, Volume 62, No. 41, March 3, 1997). The anticipated release volume for July is 950 kaf with daily fluctuations between approximately 11,500 cfs and 19,500 cfs. The expected release for August is 900 kaf with daily fluctuations between approximately 10,000 cfs and 18,000 cfs. | ||
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*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15apr21/Attach_07.pdf Water Quality in Lake Mead and Upstream Influences: Dissolved Oxygen during 2014] | *[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15apr21/Attach_07.pdf Water Quality in Lake Mead and Upstream Influences: Dissolved Oxygen during 2014] | ||
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/15feb25/Attach_02.pdf Basin Hydrology, Operations, and 2016 Hydrograph] | *[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/15feb25/Attach_02.pdf Basin Hydrology, Operations, and 2016 Hydrograph] | ||
| − | *[http://www.usbr.gov/uc/rm/amp/twg/mtgs/ | + | *[http://www.usbr.gov/uc/rm/amp/twg/mtgs/14jun24/Attach_06b.pdf Hydrology Update and 2016 Hydrograph] |
'''2014''' | '''2014''' | ||
| + | *[http://www.usbr.gov/uc/rm/amp/twg/mtgs/14jun24/Attach_06a.pdf AIF: Basin Hydrology, Operations, and 2015 Hydrograph ] | ||
| + | *[http://www.usbr.gov/uc/rm/amp/twg/mtgs/14jun24/Attach_06a.pdf Proposed 2015 Hydrograph ] | ||
Revision as of 16:42, 8 July 2016
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Current StatusThe unregulated inflow volume to Lake Powell in May was 2,294 thousand acre-feet (kaf) (98 percent of average). The release volume from Glen Canyon Dam in May was 700 kaf. The end of May elevation and storage of Lake Powell were 3,604 ft (96 feet from full pool) and 12.1 maf (50% of full capacity), respectively. The reservoir reached a seasonal low elevation on April 15th near elevation 3591.14 feet. Since that time the reservoir elevation has been increasing and will continue to increase throughout mid-summer as runoff from snowmelt and precipitation enter the reservoir.
Inflow Forecasts and Model ProjectionsThe operating tier for water year 2016 was established in August 2015 as the Upper Elevation Balancing Tier. The April 2016 24-Month Study established that Lake Powell operations will be governed by balancing for the remainder of water year 2016. Under balancing, the contents of Lake Powell and Lake Mead will be balanced by the end of the water year, but not more than 9.0 maf and not less than 8.23 maf shall be released from Lake Powell. Based on the most probable inflow forecast, this June 24-Month Study projects a balancing release of 9.0 maf in water year 2016; the actual release in water year 2016, however, will depend on hydrology in the remainder of water year and will range from 8.23 to 9.0 maf. The projected release from Lake Powell in water year 2016 will be updated each month throughout the remainder of the water year. Reclamation will schedule operations at Glen Canyon Dam to achieve as practicably as possible the appropriate total annual release volume by September 30, 2016. In June, the release volume will be approximately 800 kaf, with fluctuations anticipated between about 9,000 cfs in the nighttime to about 17,000 cfs in the daytime and consistent with the Glen Canyon Operating Criteria (Federal Register, Volume 62, No. 41, March 3, 1997). The anticipated release volume for July is 950 kaf with daily fluctuations between approximately 11,500 cfs and 19,500 cfs. The expected release for August is 900 kaf with daily fluctuations between approximately 10,000 cfs and 18,000 cfs. |
| Table- Hydrology of the Colorado River |
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