Water Shortage Management and
    Drought Response Plan




       Water Planning Committee
            October 28, 2010
Overview of Water Year 2010
 October 1, 2009 –September 30, 2010
 El Niño conditions brought above average precipitation...
Summary of Hydrologic Conditions
                              % of Average
 Hydrologic Indicator
                        ...
Combined Reservoir Storage
        in Oroville and San Luis
6.0       Capacity         San Luis      Oroville



4.0



  ...
Ongoing Dry Conditions on the Colorado
        River Basin in Water Year 2010
• Unregulated inflow to Lake Powell - 70% of...
Local Weather Conditions
 Precipitation ranged from average to above average
 in San Diego County
 Summer temperatures i...
Total Local Reservoir Storage
Acre-feet
350,000



300,000
                                                               ...
Local Weather Conditions
 October precipitation was above average and
 temperatures below average

                  Prec...
Water Year 2011 Weather
                               3-Month Precipitation Outlook
 La Nina conditions          Novembe...
Supply conditions 10 28-10slideshare
Supply conditions 10 28-10slideshare
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Supply conditions 10 28-10slideshare

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October San Diego County Water Supply Conditions

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Supply conditions 10 28-10slideshare

  1. 1. Water Shortage Management and Drought Response Plan Water Planning Committee October 28, 2010
  2. 2. Overview of Water Year 2010  October 1, 2009 –September 30, 2010  El Niño conditions brought above average precipitation and snowpack to the State Water Project  Final SWP Allocation at 50%  Dry conditions continued on the Colorado River Basin  Local supply conditions improved compared to WY 2009 with average to above average rainfall 2
  3. 3. Summary of Hydrologic Conditions % of Average Hydrologic Indicator WY 2009 WY 2010 Statewide Precipitation 82 109 Statewide Reservoir 79 105 Storage (as of Sep. 30 ) th Northern Sierra Snowpack 93 143 Maximum Accumulation Sacramento River 70 86 Unimpaired Runoff 3
  4. 4. Combined Reservoir Storage in Oroville and San Luis 6.0 Capacity San Luis Oroville 4.0 0.79 MAF 0.79 MAF 2.55 MAF 2.0 78% average 0.42 MAF 1.76 MAF 54% average 1.76 MAF 1.34 MAF 0.0 September 30, 2009 September 30, 2010 4
  5. 5. Ongoing Dry Conditions on the Colorado River Basin in Water Year 2010 • Unregulated inflow to Lake Powell - 70% of normal • Lake Mead at lowest level on Oct. 17, 2010 since filled Storage Percent Capacity Storage in MAF* Lake Powell 63 15.3 Lake Mead 39 10.2 Total System Contents 56 33.3 *As of September 20, 2010 • According to USBR, under certain hydrologic conditions shortages could be experienced in 2012 Lake Mead • Arizona and Nevada experience shortages first 5
  6. 6. Local Weather Conditions  Precipitation ranged from average to above average in San Diego County  Summer temperatures in southern California were below normal from the coast to the mountains  Coolest summer in San Diego since 1933  11th coolest summer on record 6
  7. 7. Total Local Reservoir Storage Acre-feet 350,000 300,000 289 TAF 250,000 200,000 150,000 Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Average (2001-2010) WY 2009 WY 2010 7
  8. 8. Local Weather Conditions  October precipitation was above average and temperatures below average Precipitation in San Diego July 1- October 26 October 1 – 26 Station Actual Normal Actual Normal Lindbergh Field 2.08 0.66 2.03 0.33 Ramona Airport 3.35 2.28 3.14 1.60 9
  9. 9. Water Year 2011 Weather 3-Month Precipitation Outlook  La Nina conditions November 2010 – January 2011 are present and expected last through winter 2011  Often features above average precipitation in Pacific Northwest and below average in Southwest A= Above Average Source: National Weather Service Climate B= Below Average Prediction Center October 21, 2010 EC= Equal Chance 10
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