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 April was 814 thousand acre-feet (kaf) (77 percent of average).  The release volume from Glen Canyon Dam in April was 665 kaf.  The end of April elevation and storage of Lake Powell were 3,592 ft (108 feet from full pool) and 11.01 maf (45% of full capacity), respectively.  The reservoir reached a seasonal low elevation on April 15th near elevation 3591.14 feet. Since that time the reservoir has been increasing as the first of the spring runoff is now entering 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 April to July 2016 water supply forecast for unregulated inflow to Lake Powell, issued on May 3, 2016, by the Colorado Basin River Forecast Center, projects that the most probable (median) unregulated inflow volume will be 5.5 maf (77 percent of average based on the period 1981-2010).  The forecast increased by 200 kaf since last month.  At this point in the season, there is still uncertainty regarding this year’s water supply and the total inflow to Lake Powell.  The spring runoff forecast ranges from a minimum probable of 3.85 maf (54 percent of average) to a maximum probable of 7.65 maf (107 percent of average).  There is 10% chance that inflows could be higher than the maximum probable and a 10% chance they could be lower than the minimum probable.
 
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As determined in the August 2015 24-Month Study, and documented in the 2016 Annual Operating Plan, Lake Powell’s operations in water year 2016 will be governed by the Upper Elevation Balancing Tier.  Because the April 2016 24-Month Study projected the end of water year elevation at Lake Powell to be above 3,575 feet and the end of water year elevation at Lake Mead to be below elevation 1,075.0 feet, Lake Powell operations shifted to balancing (Section 6.B.4 of the 2007 Interim Guidelines) 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.
 
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Based on the May most probable inflow forecast, the annual release volume from Lake Powell during water year 2016 is projected to be 9.0 maf.  Under the minimum probable inflow scenario, the water year release is projected to be 9.0 maf.  Under the maximum probable inflow scenario, the release is projected to be 9.0 maf.  There is 10% chance that inflows will be lower than the current minimum probable forecast, potentially resulting in lower releases.  If inflows are less than the minimum probable forecast, the water year 2016 annual release could be as low as 8.23 maf.  If inflows are greater than the current forecasted maximum probable inflow, the annual release will be 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.
 
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Based on the current forecast, the May 24-Month Study projects Lake Powell elevation will end water year 2016 near 3,603 ft with approximately 12.06 maf in storage (50% capacity).  Projections of elevation and storage still have significant uncertainty at this point in the season, primarily due to uncertainty regarding spring runoff and the resulting inflow to Lake Powell.  Under the minimum probable inflow scenario, updated in April, the projected end of water year elevation and storage are 3585 ft and 10.35 maf (43% capacity), respectively.  Under the maximum probable inflow scenario, updated in April, the projected end of water year elevation and storage are 3622 ft and 14.01 maf (58% capacity), respectively.  Modeling of projected reservoir operations based on the minimum and maximum scenarios will be updated again in August.
 
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-----------'''Welcome to the ENERGY SERVICES GROUP HOME PAGE'''---------->
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[[File:Hydrology.jpg|center|300px]]
  
 
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=='''Upper Colorado River Basin Hydrology'''==
 +
Upper Colorado River Basin regularly experiences significant year to year hydrologic variability. During the 21-year period 2000 to 2020, however, the unregulated inflow to Lake Powell, which is a good measure of hydrologic conditions in the Colorado River Basin, was above average in only 4 out of the past 19 years. The period 2000-2020 is the lowest 21-year period since the closure of Glen Canyon Dam in 1963, with an average unregulated inflow of 8.62 maf, or 80 percent of the 30-year average (1981-2010). (For comparison, the 1981-2010 total water year average is 10.83 maf.) The unregulated inflow during the 2000-2020 period has ranged from a low of 2.64 maf (24 percent of average) in water year 2002 to a high of 15.97 maf (147 percent of average) in water year 2011. In water year 2018 unregulated inflow volume to Lake Powell was 4.6 maf (43 percent of average), the third driest year on record above 2002 and 1977. [http://www.usbr.gov/uc/water/crsp/cs/gcd.html]
  
 
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! style="width=33%; background:#cedff2;" | [[Table- Hydrology of the Colorado River]]<br>
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! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Current Status] <br>  
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! style="width=33%; background:#cedff2;" | [[TBD|---]]
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! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Current Operations] <br>
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! style="width=33%; background:#cedff2;" | [[TBD|---]]
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! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Inflow Forecasts and Model Projections] <br>
 
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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;">Reservoir Elevations</h2>
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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;">Updates</h2>
 
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[[File:2016 PowellElevations.jpg|400px]]
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=='''[https://www.usbr.gov/uc/index.html Upper Colorado Region Homepage]'''==
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[[File:2016 MeadElevations.jpg|400px]]
+
*[https://www.usbr.gov/uc/water/hydrodata/reservoir_data/919/dashboard.html Hydrodata dashboard for Lake Powell]
 +
*[https://www.nrcs.usda.gov/Internet/WCIS/basinCharts/POR/WTEQ/assocHUC2/Upper%20Colorado%20Region.html Lake Powell Snow Chart]
 +
*[https://www.usbr.gov/uc/water/crsp/studies/images/PowellForecast.png Lake Powell Inflow Forecast]
 +
*[https://www.usbr.gov/uc/water/crsp/studies/images/PowellElevations.png Lake Powell Elevation Projections]
 +
*[https://www.usbr.gov/uc/water/crsp/studies/images/PowellRelease.png Lake Powell Release Projections]
 +
*[https://www.usbr.gov/uc/water/crsp/cs/gcd.html Glen Canyon Dam Operations]
  
 +
== '''USBR Weekly Water Reports''' ==
 +
*[https://www.usbr.gov/uc/water/rsvrs/ops/WeeklyHydrologySummary/Weekly_Hydro.pdf Upper Colorado Region Weekly Hydrology Summary]
 +
#Reservoir inflows (forecast and observed)
 +
#Reservoir releases
 +
#SNOTEL
  
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|-
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*[http://www.usbr.gov/lc/region/g4000/weekly.pdf Lower Colorado Water Supply Report]
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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;">Inflows to Lake Powell</h2>
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#Water use
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|style="color:#000;"|
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[[File:2016 LakePowellInflow.jpg|400px]]
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*[http://www.usbr.gov/lc/region/g4000/wtracct.html Lower Colorado River Water Accounting]
 +
*[https://www.usbr.gov/uc/water/basin/index.html Colorado River Basin Tea-Cup Diagrams]
  
 +
== '''USBR Monthly/Annual Reports''' ==
 +
*[https://www.usbr.gov/uc/water/crsp/studies/index.html 24-Month Study]
 +
*[https://www.usbr.gov/uc/water/rsvrs/ops/monthly_summaries/index.html Monthly Summaries]
 +
*[https://www.usbr.gov/uc/water/rsvrs/ops/aop/index.html Annual Operating Plans for Colorado River reservoirs]
  
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== USBR Weekly Water Report ==
+
== '''Snow Pack Reports''' ==
−
* [http://www.usbr.gov/lc/region/g4000/weekly.pdf USBR Water Report]
+
*[https://www.nrcs.usda.gov/Internet/WCIS/basinCharts/POR/WTEQ/assocHUC2/Upper%20Colorado%20Region.html Upper Colorado River Basin Snow Water Tracking]
−
* [http://www.usbr.gov/lc/region/g4000/hourly/forecast09.pdf '''USBR -LC Region Hourly Forecasts''']
+
*[https://www.usbr.gov/uc/water/hydrodata/status_maps/ Upper Colorado Basin Conditions Map]
−
* [http://www.usbr.gov/lc/region/g4000/wtracct.html USBR- Historic Use Records '''Water Accounting Reports''']
+
*[http://www.usbr.gov/uc/water/notice/snowpack.html Bureau of Reclamation- Snow Pack Report]
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*[http://www.cbrfc.noaa.gov/snow/station/sweplot/sweplot.cgi?quick=multiple SNOWTEL Report]
 +
**The snowtel report is a calculating report, and takes approximately 3 minutes to run. 
 +
**Select the report under "Public", listed as "Colorado River above Lake Powell" (116 snowtel sites). 
 +
**Data source is updated at least daily.
  
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== Snow Pack Reports ==
+
== '''U.S. Drought Monitor''' ==
  
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*[http://www.usbr.gov/uc/water/notice/snowpack.html Bureau of Reclamation- '''Snow Pack Report''']
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*[http://drought.unl.edu/DM/MONITOR.HTML U.S. Drought Monitor]
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*[http://www.cbrfc.noaa.gov/snow/station/sweplot/sweplot.cgi?quick=multiple '''SNOWTELL Report''']
+
*[http://treeflow.info/basin.html Tree Flow Data]
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**The snowtell report is a calculating report, and takes approximately 3 minutes to run. 
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−
**Select the report under "Public", listed as "Colorado River above Lake Powell" (116 snowtell sites). 
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**Data source is up-dated at least daily.
+
  
 +
== '''Inflow Volumes to Lake Powell and Release Volumes from Glen Canyon Dam''' ==
  
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10-year average inflow (2014-2023): 8.8493 maf <br>
 +
10-year average release (2014-2023): 8.4521 maf <br>
  
−
== U.S. Drought Monitor ==
+
{| class="sortable wikitable" style="text-align:center;"
 +
|-
 +
!Water Year
 +
!Unregulated Inflow (maf)
 +
!Release Volume (maf)
  
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* [http://drought.unl.edu/DM/MONITOR.HTML '''U.S. Drought Monitor''']
+
|-
−
*[http://treeflow.info/basin.html '''Tree Flow Data''']
+
|2023||13.421||08.58||
−
 
+
|-
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+
|2022||06.084||07.000||
 +
|-
 +
|2021||03.502||08.230||
 +
|-
 +
|2020||05.847||08.230||
 +
|-
 +
|2019||12.951||09.001||
 +
|-
 +
|2018||04.612||09.000||
 +
|-
 +
|2017||11.905||09.000||
 +
|-
 +
|2016||09.616||09.000||
 +
|-
 +
|2015||10.174||09.000||
 +
|-
 +
|2014||10.381||07.480||
 +
|-
 +
|2013||05.117||08.232||
 +
|-
 +
|2012||04.908||09.466||
 +
|-
 +
|2011||15.971||12.518||
 +
|-
 +
|2010||08.426||08.235||
 +
|-
 +
|2009||10.220||08.236||
 +
|-
 +
|2008||12.086||08.978||
 +
|-
 +
|2007||08.754||08.231||
 +
|-
 +
|2006||08.626||08.228||
 +
|-
 +
|2005||12.795||08.232||
 +
|-
 +
|2004||05.913||08.231||
 +
|-
 +
|2003||06.161||08.229||
 +
|-
 +
|2002||02.643||08.230||
 +
|-
 +
|2001||06.994||08.236||
 +
|-
 +
|2000||06.936||09.381||
 +
|-
 +
|1999||12.800||11.204||
 +
|-
 +
|1998||13.520||13.510||
 +
|-
 +
|1997||17.053||13.824||
 +
|-
 +
|1996||10.402||11.522||
 +
|-
 +
|1995||15.905||09.223||
 +
|-
 +
|1994||06.794||08.289||
 +
|-
 +
|1993||14.437||08.102||
 +
|-
 +
|1992||07.352||08.002||
 +
|-
 +
|1991||08.801||08.121||
 +
|-
 +
|1990||05.311||08.140||
 +
|-
 +
|1989||05.939||07.981||
 +
|-
 +
|1988||07.989||08.144||
 +
|-
 +
|1987||13.377||13.429||
 +
|-
 +
|1986||18.546||16.848||
 +
|-
 +
|1985||17.517||19.094||
 +
|-
 +
|1984||20.846||20.499||
 +
|-
 +
|1983||20.371||17.493||
 +
|-
 +
|1982||12.771||08.304||
 +
|-
 +
|1981||05.639||08.295||
 +
|-
 +
|1980||13.682||10.907||
 +
|-
 +
|1979||14.189||08.297||
 +
|-
 +
|1978||11.059||08.354||
 +
|-
 +
|1977||03.529||08.260||
 +
|-
 +
|1976||08.431||08.482||
 +
|-
 +
|1975||13.095||09.255||
 +
|-
 +
|1974||09.970||08.266||
 +
|-
 +
|1973||15.974||10.108||
 +
|-
 +
|1972||09.329||09.311||
 +
|-
 +
|1971||11.798||08.591||
 +
|-
 +
|1970||11.992||08.692||
 +
|-
 +
|1969||11.520||08.823||
 +
|-
 +
|1968||10.319||08.334||
 +
|-
 +
|1967||08.979||07.797||
 +
|-
 +
|1966||08.689||07.854||
 +
|-
 +
|1965||15.046||10.820||
 +
|-
 +
|1964||07.492||02.413||
  
  
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[[File:LakePowellInflows1906 2012.JPG|left|500px|thumbnail|[https://usea.org/sites/default/files/event-/Final_Colorado_Overview.pdf https://usea.org/sites/default/files/event-/Final_Colorado_Overview.pdf] ]]
  
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[[File:GlenCanyonRelease1995 2015.JPG|left|500px|thumbnail|[http://www.lakepowell.org/page_two/what_s_new/what_s_new.html http://www.lakepowell.org/page_two/what_s_new/what_s_new.html] ]]
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[[File:LakePowellelevations1963 2012.JPG|left|500px|thumbnail|[https://www.hcn.org/blogs/goat/is-lake-powell-really-shrinking https://www.hcn.org/blogs/goat/is-lake-powell-really-shrinking] ]]
  
 
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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Water Flow Gages</h2>
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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Stream Flow Gages</h2>
 
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|style="color:#000;"|
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*[http://graphs.water-data.com/lakepowell/ '''Lake Powell Water Level Graphs''']
 
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*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09380000 '''Colorado River at Lees Ferry''']
 
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*[http://waterdata.usgs.gov/az/nwis/uv?site_no=09382000 '''Paria River at Lees Ferry''']
 
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*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383050 '''Colorado River at 30 mile''']
 
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*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383100 '''Colorado River above LCR''']
 
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*[http://waterdata.usgs.gov/az/nwis/uv?site_no=09402300 '''LCR at Colorado River''']
 
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*[http://waterdata.usgs.gov/az/nwis/uv?site_no=09402500 '''Colorado River at Bright Angel Creek''']
 
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*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403000 '''Bright Angel Creek''']
 
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*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT6 '''Shinumo Creek''']
 
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*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402352 '''Colorado River abv Lava Canyon rm66''']
 
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*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403270 '''Colorado River bl rm127''']
 
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*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403850 '''Kanab Creek''']
 
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*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404115 '''Havasu Creek''']
 
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*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404120 '''Colorado River abv National Canyon''']
 
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*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404200 '''Colorado River bl Diamond Creek''']
 
−
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404220 '''Colorado River abv Spencer rm246''']
 
−
*[http://graphs.water-data.com/lakemead/ '''Lake Mead Water Level Graphs''']
 
  
 +
*[http://graphs.water-data.com/lakepowell/ Lake Powell Water Level Graphs]
 +
*[https://www.wapa.gov/regions/CRSP/OpsMaint/Pages/scada.aspx Glen Canyon Dam releases (SCADA)]
 +
*[https://www.usbr.gov/lc/region/g4000/riverops/_HdbWebQuery.html Glen Canyon Dam releases (HDB), SDI for total release = 1872]
 +
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-GCLT1 Water Holes Canyon above the mouth]
 +
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09380000 Colorado River at Lees Ferry]
 +
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09381800 Paria River near Kanab, UT]
 +
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09382000 Paria River at Lees Ferry, AZ]
 +
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT1 Badger Creek below highway 89A near Vermillion Cliffs, AZ]
 +
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT2 Tanner Wash below highway 89A near Bitter Springs, AZ]
 +
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT3 House Rock Wash above Emmett Wash near Cliff Dwellers, AZ]
 +
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT5 North Canyon near Cliff Dwellers, AZ]
 +
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT6 Shinumo Wash in Twentynine Mile Canyon near Cedar Ridge, AZ]
 +
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383050 Colorado River near river mile 30]
 +
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383100 Colorado River above Little Colorado River near Desert View, AZ]
 +
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401260 Moenkopi Wash at Moenkopi, AZ]
 +
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401500 Moenkopi Wash near Cameron, AZ]
 +
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401000 Little Colorado River at Grand Falls, AZ]
 +
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402000 Little Colorado River near Cameron, AZ]
 +
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402300 Little Colorado River above the mouth near Desert View, AZ]
 +
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402500 Colorado River near Grand Canyon, AZ]
 +
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403000 Bright Angel Creek near Grand Canyon, AZ]
 +
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT6 Shinumo Creek]
 +
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403850 Kanab Creek above the mouth near Supai, AZ]
 +
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404115 Havasu Creek above the mouth near Supai, AZ]
 +
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404120 Colorado River above National Canyon near Supai, AZ]
 +
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404200 Colorado River above Diamond Creek near Peach Springs, AZ]
 +
*[http://graphs.water-data.com/lakemead/ Lake Mead Water Level Graphs]
 +
 +
|-
 +
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Projects</h2>
 +
|-
 +
|style="color:#000;"|
  
  
 
|-
 
|-
−
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Reports and Links </h2>
+
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Presentations and Papers</h2>
 
|-
 
|-
 
|style="color:#000;"|
 
|style="color:#000;"|
  
−
2016
+
'''2024'''
−
*[[File:2017 Hydrology PPT.pdf '''TWG: Basin Hydrology, Operations, and 2017 Hydrograph''']]
+
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-05-15-amwg-meeting/20240515-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
−
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/16feb24/pdf/Attach_08.pdf '''AMWG: Basin Hydrology, Operations, and 2017 Hydrograph''']
+
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-02-29-amwg-meeting/20240229-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
−
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/16jan26/documents/Attach_02.pdf '''Glen Canyon Dam Operations During Equalization''']
+
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-TWGMeeting-UpperColoradoRiverBasinIRADroughtMitigationPrograms-508-UCRO.pdf Upper Colorado River Basin IRA Drought Mitigation Programs ]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-TWGMeeting-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
 +
*[https://qcnr.usu.edu/coloradoriver/blog/WY2023-schmidt-4 Reservoir Storage at the End of 2023 – Holding On to What We Have]
  
−
2015
+
'''2023'''
−
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGTU41NkhzUi1ZTTg/view '''California Drought Monitor''']
+
*[https://www.usbr.gov/uc/progact/amp/twg/2023-11-08-twg-meeting/20231108-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality]
−
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGOVVVUXFhZVBvNmM/view '''Lake Mead Issues and Lower Basin Shortage Preparedness''']
+
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations]
−
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGbDNmN3FOeW05b3c/view '''Lake Mead Issues and Lower Basin Shortage Preparedness - Presentation''']
+
*[https://www.usbr.gov/uc/progact/amp/twg/2023-06-15-twg-meeting/20230615-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations, and Water Quality]
−
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGbmRuSzRqVm5ydHc/view '''Basin Hydrology Operations, and 2016 Hydrograph''']
+
*[https://www.usbr.gov/uc/progact/amp/twg/2023-04-13-twg-meeting/20230413-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations]
−
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15jun11/Attach_04.pdf '''Basin Hydrology Operations, and 2016 Hydrograph''']
+
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-02-16-amwg-meeting/20230216-GlenCanyonDamOperationsUpperBasinHydrologyWaterQuality-508-UCRO.pdf Glen Canyon Dam Operations and Upper Basin Hydrology and Water Quality]
−
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGMHhacTF4enJ1eGs/view '''2016 Annual Operating Plan''']
+
*[https://www.usbr.gov/uc/progact/amp/twg/2023-01-26-twg-meeting/20230126-TWGMeeting-BasinHydrologyWaterQuality-508-UCRO.pdf Basin Hydrology and Water Quality]
−
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/15may28/Attach_05.pdf '''AMWG: Basin Hydrology and WY 2016 Hydrograph''']
+
−
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15apr21/Attach_03.pdf '''TWG: Hydrology Update and 2016 Hydrograph''']
+
−
*[http://http://www.usbr.gov/uc/rm/amp/twg/mtgs/15apr21/Attach_07.pdf '''Water Quality in Lake Mead and Upstream Influences: Dissolved Oxygen during
+
−
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/15feb25/Attach_02.pdf '''Basin Hydrology, Operations, and 2016 Hydrograph
+
−
2014
+
  
 +
'''2022'''
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2022-10-13-twg-meeting/20221013-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-08-18-amwg-meeting/20220818-Smith-AMWG-DROA-PPT_508.pdf AMP Role Relative to Implementing the Drought Response Operating Agreement]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-08-18-amwg-meeting/20220818-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2022-06-16-twg-meeting/20220616-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-05-18-amwg-meeting/20220518-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2022-04-13-twg-meeting/20220413-BasinHydrologyOperationsWaterQuality-Presentation-508-UCRO.pdf Basin Hydrology, Operations, and Water Quality ]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-TWGMeeting-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-02-10-amwg-meeting/20220210-BasinHydrologyWaterQualityOperations-508-UCRO.pdf Basin Hydrology, Water Quality, and Operations ]
  
 +
'''2021'''
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2021-10-14-twg-meeting/20211014-ColoradoRiverBasinAugust20215-yearProjectedFutureConditions-Presentation-508-UCRO.pdf Colorado River Basin August 2021 5-year Projected Future Conditions ]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2021-10-14-twg-meeting/20211014-Long-TermHydrologicProjectionsColoradoRiverBasinMethodsConsideringUncertainty-Presentation-508-UCRO.pdf Long-Term Hydrologic Projections for the Colorado River Basin and Methods for Considering Uncertainty]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2021-06-17-twg-meeting/20210617-ColoradoRiverBasinApril20215-yearProjectedFutureConditions-508-UCRO.pdf Colorado River Basin April 2021 5-year Projected Future Conditions ]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2021-06-17-twg-meeting/20210617-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2021-05-19-amwg-meeting/20210519-BasinHydrologyOperation-Presentation-508-UCRO.pdf Basin Hydrology and Operations ]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2021-04-14-twg-meeting/20210414-UpdateHydrologyOperationsWaterQualityConditions-508-UCRO.pdf Update on Hydrology, Operations and Water Quality Conditions ]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2021-02-11-amwg-meeting/20210211-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2021-01-22-twg-meeting/20210122-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
 +
 +
'''2020'''
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2020-10-15-twg-meeting/20201015-OpsHydrologyTWG-508.pdf TWG Basin Hydrology and Operations ]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-08-20-amwg-meeting/20200820-BasinHydrologyReservoirOperations2020-2021Hydrograph-Presentation-508-UCRO.pdf Basin Hydrology, Reservoir Operations 2020 and 2021 Hydrograph ]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2020-06-24-twg-meeting/20200624-HydrologyOperationsReservoirRelease-508-UCRO.pdf Hydrology, Operations and Reservoir Release presentation ]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-05-20-amwg-meeting/20200520-AMWG-HydrologyOperationsReservoirRelease-508-UCRO.pdf Hydrology, Operations and Reservoir Release presentation ]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-02-12-amwg-meeting/20200212-AMWG-HydrologyOperationsReservoirRelease-Presentation-508-UCRO.pdf Hydrology, Operations and Reservoir Release]
 +
 +
'''2019'''
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2019-10-21-twg-meeting/20191021-BasinHydrologyReservoirOperations2020Hydrograph-Presentation-508-UCRO.pdf Basin Hydrology, Reservoir Operations and 2020 Hydrograph Presentation ]
 +
 +
'''2018'''
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2018-10-10-twg-meeting/Attach_06.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-08-22-amwg-meeting/Attach_02.pdf Basin Hydrology, Reservoir Operations 2018 and 2019 Hydrograph]
 +
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Udall.pdf How Will the Colorado Run? The Colorado River in a Warmer World]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2018-06-25-twg-meeting/Attach_04.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-05-22-amwg-meeting/Attach_02.pdf Basin Hydrology, Reservoir Operations 2018 and 2019 Hydrograph PPT]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2018-04-23-twg-meeting/Attach_13.pdf The 21st Century Colorado River Hot Drought and Implications for the Future PPT]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2018-04-23-twg-meeting/Attach_06.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-02-14-amwg-meeting/Attach_03.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2018-01-25-twg-meeting/AR21.pdf Basin Hydrology, Operations and 2018 Hydrograph PPT]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2018-01-25-twg-meeting/Attach_04.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
 +
 +
'''2017'''
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2017-04-20-twg-meeting/Attach_03.pdf Basin Hydrology and Operations]
 +
*[[Media:Feb2017 OperationsCall.pdf| February 2017 Glen Canyon Montly Operational Coordination Call]]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2017-02-15-amwg-meeting/Attach_05.pdf Basin Hydrology, and 2017-2018 Operations]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2017-02-15-amwg-meeting/Attach_16.pdf Analysis of Water Losses and Impacts to the Grand Canyon Ecosystem of the "Fill Mead First" Proposal and PPT]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/A6_Davidson.pdf Basin Hydrology, Operations and 2018 Hydrograph]
 +
 +
'''2016'''
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-08-24-amwg-meeting/Attach_05.pdf Basin Hydrology and Water Year (WY) 2017 Hydrograph]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-05-25-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2017 Hydrograph]
 +
*[[Media:2017 Hydrology PPT.pdf| TWG: Basin Hydrology, Operations, and 2017 Hydrograph]]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-02-24-amwg-meeting/Attach_08.pdf Basin Hydrology, Operations, and 2017 Hydrograph]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/Attach_03.pdf Glen Canyon Dam Operations During Equalization]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/AR01_Topping.pdf Project 2: Streamflow,  Water Quality, Sediment Transport, and Sand Budgets in the Colorado River Ecosystem]
 +
 +
'''2015'''
 +
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGTU41NkhzUi1ZTTg/view California Drought Monitor]
 +
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGOVVVUXFhZVBvNmM/view Lake Mead Issues and Lower Basin Shortage Preparedness]
 +
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGbDNmN3FOeW05b3c/view Lake Mead Issues and Lower Basin Shortage Preparedness - Presentation]
 +
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGbmRuSzRqVm5ydHc/view Basin Hydrology Operations, and 2016 Hydrograph]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2015-06-11-twg-meeting/Attach_04.pdf Basin Hydrology Operations, and 2016 Hydrograph]
 +
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGMHhacTF4enJ1eGs/view 2016 Annual Operating Plan]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-05-28-amwg-meeting/Attach_05.pdf Basin Hydrology and WY 2016 Hydrograph]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2015-04-21-twg-meeting/Attach_03.pdf Hydrology Update and 2016 Hydrograph]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2015-04-21-twg-meeting/Attach_07.pdf Water Quality in Lake Mead and Upstream Influences: Dissolved Oxygen during 2014]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2016 Hydrograph]
 +
 +
'''2014'''
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2014-06-24-twg-meeting/Attach_06a.pdf Basin Hydrology, Operations, and 2015 Hydrograph ]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-08-27-amwg-meeting/Attach_02a.pdf Basin Hydrology, Operations ]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-05-27-amwg-meeting/Attach_01.pdf Basin Hydrology, Operations, and 2015 Hydrograph and AIF: Development of Water Year 2015 Hydrograph ]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2015 Hydrograph ]
 +
 +
'''2013'''
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-08-08-amwg-meeting/Attach_03.pdf Basin Hydrology and Operations ]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_04.pdf Colorado River Basin Hydrology and Projected Glen Canyon Dam Operations ]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_05a.pdf DOI/DOE FY14 Hydrograph ]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_05b.pdf Approved FY14 Hydrograph ]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_02.pdf Basin Hydrology and Operations]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_03.pdf Colorado River Basin Water Supply and Demand Study]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2013-01-24-twg-meeting/Attach_05.pdf Executive Summary--Pre-Production Copy of the Colorado River Basin Water Supply and Demand Study]
 +
*[https://www.usbr.gov/lc/region/programs/crbstudy/finalreport/index.html Colorado River Basin Water Study & Demand Study - Final Study Reports]
 +
 +
'''2012'''
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_03.pdf Basin Hydrology ]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Attach_09.pdf Basin Hydrology and Operations ]
 +
*[https://www.gcmrc.gov/about/ka/KA%202%20-%2010-19-11/AM%20Talks/Grams%20Flow%20Temp%20Turbidity.pdf Flow Temp Turbidity ]
 +
 +
'''2011'''
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-08-24-amwg-meeting/Attach_08.pdf Basin Hydrology ]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-05-18-amwg-meeting/Attach_03.pdf Basin Hydrology ]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-05-18-amwg-meeting/Attach_10.pdf Secure Water Act Section 9503 (c) - Water and Climate Change]
 +
*[https://www.usbr.gov/uc/progact/amp/twg/2011-01-20-twg-meeting/Attach_04a.pdf Bureau of Reclamation Updates ]
 +
 +
'''2010'''
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_06.pdf Basin Hydrology and Operations]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-02-03-amwg-meeting/Attach_12.pdf Basin Hydrology and PPT]
 +
 +
'''2009'''
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-08-12-amwg-meeting/Attach_08b.pdf Basin Hydrology PPT]
 +
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-04-29-amwg-meeting/Attach_11.pdf Basin Hydrology and PPT]
 +
 +
'''2003'''
 +
*[https://pubs.usgs.gov/pp/pp1677/pdf/pp1677.pdf Topping et al. 2003.  Computation and analysis of the instantaneous-discharge record for the Colorado River at Lees Ferry, Arizona, May 8, 1921 through September 30, 2000: U.S. Geological Survey Professional Paper 1677, 118 p.]
  
 
|-
 
|-
Line 158: Line 399:
 
|style="color:#000;"|
 
|style="color:#000;"|
  
−
===''Operational Flexibility''===
 
  
−
In addition to daily scheduled fluctuations for power generation, the instantaneous releases from Glen Canyon Dam may also fluctuate to provide 40 megawatts (mw) of system regulation.  These instantaneous release adjustments stabilize the electrical generation and transmission system and translate to a range of about 1,200 cfs above or below the hourly scheduled release rate.  Under system normal conditions, fluctuations for regulation are typically short lived and generally balance out over the hour with minimal or no noticeable impacts on downstream river flow conditions.
+
|}
−
 
+
−
Releases from Glen Canyon Dam can also fluctuate beyond scheduled releases when called upon to respond to unscheduled power outages or power system emergencies.  Depending on the severity of the system emergency, the response from Glen Canyon Dam can be significant, within  the full range of the operating capacity of the power plant for as long as is necessary to maintain balance in the transmission system.  Glen Canyon Dam typically maintains 30 mw (approximately 880 cfs) of generation capacity in reserve in order to respond to a system emergency even when generation rates are already high.  System emergencies occur fairly infrequently and typically require small responses from Glen Canyon Dam.  However, these responses can have a noticeable impact on the river downstream of Glen Canyon Dam.
+
  
−
===''Hydrologic Variability''===
 
  
−
The Upper Colorado River Basin regularly experiences significant year to year hydrologic variability.  During the 16-year period 2000 to 2015, however, the unregulated inflow to Lake Powell, which is a good measure of hydrologic conditions in the Colorado River Basin, was above average in only 3 out of the past 16 years.  The period 2000-2015 is the lowest 16-year period since the closure of Glen Canyon Dam in 1963, with an average unregulated inflow of 8.51 maf, or 79% of the 30-year average (1981-2010).  (For comparison, the 1981-2010 total water year average is 10.83 maf.)  The unregulated inflow during the 2000-2015 period has ranged from a low of 2.64 maf (24 percent of average) in water year 2002 to a high of 15.97 maf (147 percent of average) in water year 2011.  The water year 2015 unregulated inflow volume to Lake Powell was 10.174 maf (94 percent of average), which, though still below average, was significantly higher than inflows observed in 2012 and 2013 (45% and 47 percent of average, respectively).
+
<Span></Span>

Latest revision as of 11:19, 23 August 2024
Hydrology.jpg

Upper Colorado River Basin Hydrology

Upper Colorado River Basin regularly experiences significant year to year hydrologic variability. During the 21-year period 2000 to 2020, however, the unregulated inflow to Lake Powell, which is a good measure of hydrologic conditions in the Colorado River Basin, was above average in only 4 out of the past 19 years. The period 2000-2020 is the lowest 21-year period since the closure of Glen Canyon Dam in 1963, with an average unregulated inflow of 8.62 maf, or 80 percent of the 30-year average (1981-2010). (For comparison, the 1981-2010 total water year average is 10.83 maf.) The unregulated inflow during the 2000-2020 period has ranged from a low of 2.64 maf (24 percent of average) in water year 2002 to a high of 15.97 maf (147 percent of average) in water year 2011. In water year 2018 unregulated inflow volume to Lake Powell was 4.6 maf (43 percent of average), the third driest year on record above 2002 and 1977. [1]

Current Status
Current Operations
Inflow Forecasts and Model Projections

Updates

Upper Colorado Region Homepage

USBR Weekly Water Reports

  1. Reservoir inflows (forecast and observed)
  2. Reservoir releases
  3. SNOTEL
  1. Water use

USBR Monthly/Annual Reports

Snow Pack Reports

U.S. Drought Monitor

Inflow Volumes to Lake Powell and Release Volumes from Glen Canyon Dam

10-year average inflow (2014-2023): 8.8493 maf
10-year average release (2014-2023): 8.4521 maf

Water Year Unregulated Inflow (maf) Release Volume (maf)
2023 13.421 08.58
2022 06.084 07.000
2021 03.502 08.230
2020 05.847 08.230
2019 12.951 09.001
2018 04.612 09.000
2017 11.905 09.000
2016 09.616 09.000
2015 10.174 09.000
2014 10.381 07.480
2013 05.117 08.232
2012 04.908 09.466
2011 15.971 12.518
2010 08.426 08.235
2009 10.220 08.236
2008 12.086 08.978
2007 08.754 08.231
2006 08.626 08.228
2005 12.795 08.232
2004 05.913 08.231
2003 06.161 08.229
2002 02.643 08.230
2001 06.994 08.236
2000 06.936 09.381
1999 12.800 11.204
1998 13.520 13.510
1997 17.053 13.824
1996 10.402 11.522
1995 15.905 09.223
1994 06.794 08.289
1993 14.437 08.102
1992 07.352 08.002
1991 08.801 08.121
1990 05.311 08.140
1989 05.939 07.981
1988 07.989 08.144
1987 13.377 13.429
1986 18.546 16.848
1985 17.517 19.094
1984 20.846 20.499
1983 20.371 17.493
1982 12.771 08.304
1981 05.639 08.295
1980 13.682 10.907
1979 14.189 08.297
1978 11.059 08.354
1977 03.529 08.260
1976 08.431 08.482
1975 13.095 09.255
1974 09.970 08.266
1973 15.974 10.108
1972 09.329 09.311
1971 11.798 08.591
1970 11.992 08.692
1969 11.520 08.823
1968 10.319 08.334
1967 08.979 07.797
1966 08.689 07.854
1965 15.046 10.820
1964 07.492 02.413


https://usea.org/sites/default/files/event-/Final_Colorado_Overview.pdf
http://www.lakepowell.org/page_two/what_s_new/what_s_new.html
https://www.hcn.org/blogs/goat/is-lake-powell-really-shrinking

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