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Water Tracker

A monthly assessment of trends in water supply
and use for Santa Clara County, California


As of June 1, 2015

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From January 2015 through April 2015, water use by the major retailers in the county was 11% less when compared to the same period in 2013 which is below our Board of Director’s call for 30%.  April 2015 compared to April 2013 has been our best month so far at a 25% reduction. For the first time in state history, the Governor has directed the State Water Resources Control Board to implement mandatory water reductions in cities and towns across California to reduce water usage by 25%.  Please remember that most areas in the county have a restriction on irrigating ornamental landscape with potable water to two days a week according to the following schedule:

  • Odd numbered addresses may water on Mondays and Thursdays;
  • Even numbered addresses may water on Tuesdays and Fridays; and
  • Properties without an address may water on Mondays and Thursdays.



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Rainfall in San Jose:

  • Month of May = 0.71 inches
  • Total to date = 13.31 inches or 94% of average to date (rainfall year is July 1 to June 30)
  • June 1 Northern Sierra snowpack water content is about 0% of normal for this date



Local Reservoirs

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  • Total June 1 storage = 85,407 acre-feet
    (Click here for current local reservoir storage)
    • 74% of 20-year average for that date
    • 51% of total capacity
    • 69% of restricted capacity storage
      (169,009 acre-feet total storage capacity limited by seismic restrictions to 122,924 acre-feet)
  • Approximately 3,340 acre-feet of Imported Water delivered into local reservoirs during May 2015

Imported water 

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  • 2015 State Water Project (SWP) and Central Valley Project (CVP) allocations:
    • 2015 SWP allocation:  20% = 20,000 acre-feet
    • 2015 CVP allocations:  Municipal and Industrial users South-of-Delta will receive enough water to meet health and safety needs or 25% of historic use, whichever is greater, 0% for Irrigation.  A total of 40,300 acre-feet is anticipated to be delivered 
  • Reservoir storage (map) (table), as of June 1, 2015:
    • Shasta Reservoir at 53% of capacity (62% of average for this date)
    • Oroville Reservoir at 44% of capacity (52% of average for this date)
    • San Luis Reservoir at 53% of capacity (67% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • District Semitropic groundwater bank reserves:  An estimated 221,760 acre-feet as of June 1, 2015.  District is pursuing maximum allowable withdrawals in 2015
  • Board Governance Policy No. EL-7.3 includes keeping the Board informed of imported water management activities on an ongoing basis.  In FY15, 26 imported water management agreements were executed as of June 1; staff is continuing to pursue several potential agreements
  • Hetch Hetchy deliveriesEstimated Hetch Hetchy deliveries to Santa Clara County (click to enlarge graph at right):
    • Month of May  = 5,000 acre-feet
    • Year-to-date = 17,000 acre-feet, or 104% of the five-year average



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Groundwater storage:  Total storage at the end of 2015 is predicted to fall within Stage 4 (Critical) of the Water Shortage Contingency Plan if dry conditions continue and no reduction measures are implemented

Santa Clara Plain

Coyote Valley

Llagas Subbasin

Santa Clara Plain
- The May managed recharge estimate is 4,300 acre-feet.  The year-to-date managed recharge estimate is 8,400 acre-feet, or 40% of the five-year average 

- The May groundwater pumping estimate is 11,500 acre-feet.  The year-to-date groundwater pumping estimate is 39,400 acre-feet, or 133% of the five-year average 

- The groundwater level in the Santa Clara Plain (San Jose) is about 4 feet lower than May last year and about 30 feet lower than the five-year average

Coyote Valley
- The May managed recharge estimate is 580 acre-feet.  The year-to-date managed recharge estimate is 2,800 acre-feet, or 62% of the five-year average

- The May groundwater pumping estimate is 1,100 acre-feet.  The year-to-date groundwater pumping estimate is 3,800 acre-feet, or 93% of the five-year average 

- The groundwater level in Coyote Valley is about two feet higher than May last year and five feet lower than the five-year average
Llagas Subbasin
- The May managed recharge estimate is 900 acre-feet.  The year-to-date managed recharge estimate is 3,400 acre-feet, or 35% of the five-year average 

- The May groundwater pumping estimate is 4,500 acre-feet.  The year-to-date groundwater pumping estimate is 13,600 acre-feet, or 112% of the five-year average 

- The groundwater level in Llagas Subbasin (San Martin) is about seven feet lower than May last year and 34 feet lower than the five-year average


Treated water 

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  • Treated Water DeliveredBelow average demands of 9,481 acre-feet delivered in May
  • This total is 83% of the five-year average for May
  • Estimated year-to-date = 32,790 acre-feet or 82% of the five-year average



Conserved water


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  • /uploadedImages/Services/CleanReliableWater/WaterSupplyPlanning/WaterTracker_documents_and_images/1-Final_Docs_and_Images/11.Aug_2013_Total-Water-Use.jpgSaved 59,300 acre-feet in FY14 from long-term program (baseline year is 1992)
  • Long-term program goal is to save nearly 63,000 acre-feet in FY15
  • The Board has called for a 30% reduction and a limit of two days per week for irrigation of ornamental landscape with potable water
  • Achieved an 11% decrease in water use through the first four months of 2015 compared to 2013


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  • Recycled WaterEstimated May 2015 production  =  2,300 acre-feet
  • Estimated year-to-date through May = 7,800 acre-feet or 140% of the five-year average
  • Silicon Valley Advanced Water Purification Center produced an estimated 2,016 million gallons (6,188 acre-feet) of advanced purified recycled water since March 25, 2014.  The purified water is blended with existing tertiary recycled water for South Bay Water Recycling Program's customer