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Operations for Hungry Horse and Lake Como

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Bureau of Reclamation, and operation overview of Hungry Horse and Lake Como reservoirs for the Clark Fork River Basin Water Summary 2012 & Water Outlook 2013 on October 23, 2012.

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Operations for Hungry Horse and Lake Como

  1. 1. 2012 Operations and 2013 Outlook for Hungry Horse and Como
  2. 2. Hungry Horse Forecasted and Actual Inflow for 2012 Forecast Month Forecast Volume Forecast Volume Jan-Jul May-Sep (% of average) (% of average) Jan 92 92 Feb 96 97 Mar 93 95 Apr 102 104 May 105 94 June 107 94 Actual 124 114 June-July runoff forecast was 880 kaf (92%). Actual June- July runoff was 1263 kaf (131%)
  3. 3. NWRFC ESP forecasts• June 4, 2012 – June-July volume of 784 kaf (82%)• June 15, 2012 – June-July volume of 951 kaf (99%)• June 25, 2012 – June-July volume of 1040 kaf (108%)• June 29, 2012 – June-July volume of 1173 kaf (122%)• Actual - June-July volume of 1263 kaf (131%)
  4. 4. June 2012 Precipitation (% of average) Flathead Basin
  5. 5. Precipitation• Expected future precipitation used in runoff forecasts can vary dramatically from what actually happens• June 2012 precipitation was over 200% of average (highest June total on record and 4 th highest month ever on record). 8 inches recorded at Hungry Horse Dam• The result was much higher runoff in June than was forecasted
  6. 6. Hungry Horse Operations, 2012 3565.00 60.0 Reservoir surcharged 0.5 ft to limit discharge 3560.00 50.0 3555.00 3550.00 40.0 Forebay (ft.) 3545.00 ) Discharge (kcfs) 30.0 Inflow (kcfs) 3540.00 w o k F c s f ( l CFMM (kcfs)onbeaEvyFrtf)(il 3535.00 20.0 3530.00 10.0 3525.00 3520.00 0.0 1-Mar-12 1-Apr-12 1-May-12 1-Jun-12 1-Jul-12 1-Aug-12 1-Sep-12
  7. 7. Local Flood Control• Hungry Horse is operated to help keep the Flathead River at Columbia Falls below 14 ft if possible.• Flows can be reduced down to a minimum of 300 cfs if there is room in the reservoir to store• The Flathead River at Columbia Falls can often exceed flood stage even with reduced flows depending on flow in the Middle and North Forks
  8. 8. Flathead River at Columbia Falls• There were 12 days in 2012 when the daily average natural flow at Columbia Falls exceeded the flood flow of 51,800 cfs• The actual regulated flow at Columbia Falls exceeded flood flow once for 13 hrs on June 27 with a peak stage of 14.18 ft or 2 inches above flood stage
  9. 9. Hungry Horse 2013 Outlook• As of Oct 15, 2012, Hungry Horse was at elevation 3547.3 ft which is above average for this time of year but typical for years with the 10 ft. draft on September 30• Currently releasing minimum flows• Will continue to release minimum flows until flood control requires higher releases
  10. 10. Hungry Horse 2013 Outlook (cont.)• NWRFC ESP water supply forecast (issued Oct 12) is around 90% of average for April-July inflow volume into Hungry Horse• The first official operating forecast will be released in January 2013
  11. 11. Como Operations (WY 2012) 2010 Forebay (ft) 2009 Forebay (ft) 2011 Forebay (ft) 2012 Forebay (ft) 4250.00 4240.00 4230.00 4220.00 4210.00RoneaEvsrtf)(li 4200.00 4190.00 4180.00 1-Oct 1-Nov 1-Dec 1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun 1-Jul 1-Aug 1-Sep
  12. 12. Como 2013 Outlook• As of Oct 15, 2012, Como is at elevation 4200.8 ft which is average for this time of year• NWRFC ESP water supply forecast (issued Oct 18) for the Bitterroot near Darby is around 70% of average for April-July runoff volume• Como nearly always fills even in drier years. 2001 was the last year it did not fill but within 3 ft of full

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