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Water Tracker

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


As of February 1, 2015

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 Cumulative water savings in the County from February 2014 to December 2014 is estimated at 13%, which is less than the 20% target called by the Board. January 2015 was very dry with no precipitation registering on the San Jose precipitation gauge. The Northern Sierra snowpack is one-fourth of normal and the primary reservoirs for our water supply are less than three-fourths of normal for this time of year. The initial State Water Project allocation increased from 10% to 15% in January. An initial 2015 Central Valley Project allocation is expected in February. Groundwater levels in the Santa Clara Plain and Llagas Subbasin are over 30 feet lower than average. Water use reduction measures will be continued until at least June 2015 even if the remaining winter months have normal precipitation. Rain or Shine – Keep Saving Water!




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Rainfall in Santa Clara County:

  • Month of January = 0.0 inches
  • Total to date = 9.92 inches or 126% of average to date (rainfall year is July 1 to June 30); February 2 Northern Sierra snowpack water content is about 21% of average for that date



Local Reservoirs

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  • Total February 1 storage = 67,186 acre-feet
    (Click here for current local reservoir storage)
    • 70% of 20-year average for that date
    • 40% of total capacity
    • 55% of restricted capacity storage
      (169,009 acre-feet total storage capacity limited by seismic restrictions to 122,924 acre-feet)
  • No imported water delivered into local reservoirs during January 2015

Imported water 

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  • 2015 State Water Project (SWP) and Central Valley Project (CVP) allocations:
    • 2015 SWP allocation:  15% = 15,000 acre-feet (SWP allocation increased from 10% to 15% in January).  See links to SWP Notice to Contractors and Press Release 
    • Initial 2015 CVP allocations expected to be announced in mid-February
  • Reservoir storage (map) (table), as of February 1, 2015:
    • Shasta Reservoir at 44% of capacity (65% of average for this date)
    • Oroville Reservoir at 41% of capacity (62% of average for this date)
    • San Luis Reservoir at 54% of capacity (69% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • District Semitropic groundwater bank reserves:  262,665 acre-feet at start of 2014 (75% of capacity).  An estimated 35,000 acre-feet was withdrawn from Semitropic in 2014; although District did not have to implement California Aqueduct Reverse Flow Project in 2014, if drought continues District may need to implement and/or expand reverse flow project to retrieve its previously-stored water supplies from Semitropic 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, seven imported water management agreements were executed as of February 1; staff continuing to pursue several potential agreements
  • Hetch Hetchy deliveriesEstimated Hetch Hetchy deliveries to Santa Clara County (click to enlarge graph at right):
    • Month of January  = 2,700 acre-feet
    • 2014 Total = 46,200 acre-feet, or 89% of the five-year average
    • 2014 reduction = 17% cumulative through December 2014, included in above County total of 13%



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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 January managed recharge estimate is 480 acre-feet, which is 12% of the five-year average

- The January groundwater pumping estimate is 5,300 acre-feet, which is 111% of the five-year average

- The groundwater level in Santa Clara Plain (San Jose) is about 26 feet lower than January last year and about 41 feet lower than the five-year average

Coyote Valley
- The January managed recharge estimate is 550 acre-feet, which is 64% of the five-year average

- The January groundwater pumping estimate is 630 acre-feet, which is 86% of the five-year average 

- The groundwater level in Coyote Valley is about two feet lower than January last year and two feet lower than the five-year average
Llagas Subbasin
- The January managed recharge estimate is 430 acre-feet, which is 22% of the five-year average 

- The January groundwater pumping estimate is 1,500 acre-feet, which is 75% of the five-year average 

- The groundwater level in Llagas Subbasin (San Martin) is about 13 feet lower than January last year and 32 feet lower than the five-year average


Treated water 

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  • Treated Water DeliveredBelow average demands of 5,611 acre-feet delivered in January
  • This total is 77% of the five-year average for January



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
  • Based on the District's Water Shortage Contingency Plan, the Board has extended the call for a 20% reduction through June 30, 2015
  • Currently achieving a 13% reduction compared to 2013 (through December 2014)


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  • Recycled WaterEstimated January 2015 production  =  1,304 acre-feet
  • Estimated 2015 = 1,304 acre-feet or 146% of the five-year average
  • Silicon Valley Advanced Water Purification Center produced 1,640 million gallons (5,032 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