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Water Tracker

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

 

As of November 1, 2016

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Santa Clara County residents and businesses reduced water use by 21% in September 2016 compared to September 2013. This brings the cumulative 2016 water savings through September to 27% compared to the same period of 2013. Realizing parts of the state were better off than others in terms of water supply, the State Water Resources Control Board adopted an updated Emergency Regulation in May that allowed water retailers throughout the state to determine their individual conservation standards based on local conditions.

At its June 14 meeting, the District’s Board of Directors (Board) lowered its water use reduction target to 20% for the period extending through January 2017, but emphasized that residents should continue their efforts to conserve in this ongoing drought. The Board also called for local water providers to continue to institute mandatory measures, as needed, to reach the 20% target, and called for restrictions on watering schedules to a maximum of three times a week, up from the two day a week schedule most areas of the county have had in place since the spring of 2015.

In preparation for planned major facility outages in early 2017, 10,000 AF of imported supplies is currently being conveyed to Anderson Reservoir and recharge rates are being curtailed. Due to the reduced recharge, water levels in some of our percolation ponds may drop noticeably. Even with this reduction, groundwater recharge operations are expected to meet or exceed the 2016 recharge plan, which entails more recharge than in normal years.

 


 


Weather

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Rainfall in San Jose:

  • Month of October = 1.46 inches
  • Rainfall year total = 1.46 inches or 113% of average to date (Rainfall year is July 1 to June 30)
  • The average daily high temperature for October was 74.5 degrees Fahrenheit.  Temperatures were above normal for the month      
 
 


Local Reservoirs

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  • Total November 1 storage = 69,130 acre-feet
    (Click here for current local reservoir storage)
    • 88% of 20-year average for that date
    • 41% of total capacity
    • 56% of restricted capacity
      (169,009 acre-feet total storage capacity limited by seismic restrictions to 122,924 acre-feet)
  • Approximately 4,028 acre-feet of imported water delivered into local reservoirs during October 2016
  • Total releases to streams (local and imported water) during October was 7,704 acre-feet
 
 


Groundwater

 

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Groundwater Storage:  End of 2016 storage is predicted to fall near the boundary of Stage 2 (Alert) and Stage 1 (Normal) of the Water Shortage Contingency Plan:

Groundwater Table


Santa Clara Plain
Santa Clara Plain

Coyote Valley
Coyote Valley

Llagas Subbasin
Llagas Subbasin


(click to enlarge)


   

Imported water

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  • 2016 State Water Project (SWP) and Central Valley Project (CVP) allocations:
    • 2016 SWP allocation: 60% = 60,000 acre-feet
    • 2016 CVP allocations South-of-Delta:  Municipal and Industrial water service contractors:  55% of historic use = 71,500 acre-feet, Agriculture water service contractors:  5% = 1,655 acre feet
  • Reservoir storage (map) (table), as of October 31, 2016: 
    • Shasta Reservoir at 60% of capacity (102% of average for this date)
    • Oroville Reservoir at 44% of capacity (73% of

      Delta Flows

      /uploadedImages/Services/CleanReliableWater/WaterSupplyPlanning/WaterTracker_documents_and_images/1-Final_Docs_and_Images/Delta-Pie-Chart.jpg
      (click to enlarge) 

      average for this date)
    • San Luis Reservoir at 28% of capacity (54% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • District Semitropic groundwater bank reserves: An estimated 190,339 acre-feet as of October 31, 2016
  • Estimated SFPUC deliveries (graph) to Santa Clara County
    • Month of October = 3,829 acre-feet
    • 2016 Total = 36,705 acre-feet
    • Five-year average is 48,700 acre-feet
 
 

Treated water 

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  • Treated Water DeliveredAbove average demands of 10,560 acre-feet delivered in October
  • This total is 103% of the five-year average for October
  • Year-to-date = 84,560 acre-feet or 85% 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 69,000 acre-feet in FY16 from long-term program (baseline year is 1992)
  • Long-term program goal is to save nearly 72,000 acre-feet in FY17
  • The Board has called for a 20% reduction and a limit of three days per week for irrigation of ornamental landscape with potable water
  • Achieved a 27% reduction in water use through the first nine months of 2016, compared to 2013
 
 


Recycled
water

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  • Recycled WaterEstimated October 2016 production  =  1,900 acre-feet
  • Estimated year-to-date through October = 17,338 acre-feet or 104% of the five-year average
  • Silicon Valley Advanced Water Purification Center produced an estimated 4 billion gallons (12,400 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