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Water Tracker

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

 

As of September 1, 2014

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Due to continuing drought and limited water supplies, the district has reduced its groundwater recharge program in 2014. At the same time, groundwater pumping has increased in some areas to meet Santa Clara County water needs, resulting in groundwater levels dropping up to 37 feet compared to the five-year average for this month. Cumulative 2014 water savings through July are estimated at 11% compared to 2013 usage, which is less than the 20% water use reduction target set by the Board in February. On July 29, a new State emergency regulation went into effect to support increased conservation by all Californians. The new regulation targets outdoor water use, with bans on washing down driveways and sidewalks, excess runoff from landscape irrigation, use of a hose for vehicle washing without a shut-off nozzle, and use of potable water for fountains without a recirculation system. Santa Clara County’s water retailers have activated or are working to activate these mandatory water use restrictions and to provide appropriate notice to their customers. 

 

 
 


Weather

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Rainfall in Santa Clara County:

  • Month of August = 0.0 inches
  • The average daily high temperature for August was 8 degrees Fahrenheit.  Temperatures were slightly below normal for the month

      

       
 


Local Reservoirs

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  • Total September 1 storage = 65,898 acre-feet*
    (Click here for current local reservoir storage)
    • 67% of 20-year average for this date
    • 39% of total capacity
    • 54% of restricted capacity storage
      (169,009 acre-feet total storage capacity limited by seismic restrictions to 122,924 acre-feet)
  • Lowest storage levels are in Chesbro, Uvas, Guadalupe, and Stevens Creek reservoirs at 2%, 6%, 7%, and 9% of their total capacities, respectively

      *Total includes over 49% imported water (none stored in the month of August)

       
 


Imported water 

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  • 2014 State Water Project (SWP) and Central Valley Project (CVP) allocations:
    • SWP allocation:  5% = 5,000 acre-feet (20% of allocation [1,000 acre-feet] may be delivered in summer, 80% after September 1) 
    • CVP allocations:  50% for Municipal and Industrial uses and Zero% for Irrigation for a total of 65,000 acre-feet  
  • 2013 SWP and CVP carryover supplies to 2014:  31,227 acre-feet
  • Reservoir storage (map) (table), as of September 1, 2014:
    • Shasta Reservoir at 29% of capacity (47% of average for this date)
    • Oroville Reservoir at 31% of capacity (47% of average for this date)
    • San Luis Reservoir at 19% of capacity (44% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • Semitropic groundwater bank reserves:  262,665 acre-feet at start of year.  Withdrawal of banked reserves may be limited by SWP operational constraints, with the available quantity to be determined; California Aqueduct Reverse Flow Project initiated to expand exchange potential with the CVP
  •  Hetch Hetchy No imported water management agreements executed in July
  • Estimated Hetch Hetchy deliveries to Santa Clara County (click to enlarge graph at right):
    • Month of August  = 5,000 acre-feet
    • 2014 Total = 31,200 acre-feet, or 94% of the five-year average
    • 2014 reduction = 10% announced by SFPUC
       
 


Groundwater

 

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Groundwater storage:  Total storage at the end of 2014 is projected to fall within Stage 3 (Severe) of the Water Shortage Contingency Plan.  If the 20% water use reduction target set by the Board on February 25 is achieved, 2014 end of year storage is projected to be within range of Stage 2 (Alert).


Santa Clara Plain

Coyote Valley

Llagas Subbasin

Santa Clara Plain
- The August managed recharge estimate is 400 acre-feet. The year-to-date managed recharge estimate is 9,600 acre-feet or 25% of the five-year average

- The August groundwater pumping estimate is 11,500 acre-feet. The year-to-date groundwater pumping estimate is 79,700 or 139% of the five-year average

- The groundwater level in Santa Clara Plain (San Jose) is about 27 feet lower than last year and about 37 feet lower than the five-year average

Coyote Valley
- The August managed recharge estimate is 550 acre-feet. The year-to-date managed recharge estimate is 4,900 acre-feet, or 56% of the five-year average

- The August groundwater pumping estimate is 1,000 acre-feet. The year-to-date groundwater pumping estimate is 5,600 acre-feet, or 81% of the five-year average 

- The groundwater level in Coyote Valley is about eight feet lower than last year and 11 feet lower than the five-year average
Llagas Subbasin
- The August managed recharge estimate is 570 acre-feet. The year-to-date managed recharge estimate is 5,700 acre-feet, or 34% of the five-year average 

- The August groundwater pumping estimate is 4,100 acre-feet. The year-to-date groundwater pumping estimate is 26,500 acre-feet, or 96% of the five-year average 

- The groundwater level in Llagas Subbasin (San Martin) is about 21 feet lower than last year and 31 feet lower than the five-year average

       
 

Treated water 

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  •   Treated Water Delivered  Below average demands of 9,690 acre-feet delivered in August
  • This total is 70% of the five-year average for August
  • Estimated year-to-date = 64,300 acre-feet, which is 79% 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
  • Based on the District's Water Shortage Contingency Plan, the Board set a 2014 water use reduction target of 20%, in addition to long-term program savings
  • Currently achieving a 11% reduction compared to 2013 (through July 2014)
       
 


Recycled
water

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  •   Recycled WaterEstimated August 2014 production  =  2,805 acre-feet (billed semi-annually)
  • Estimated year-to-date = 15,513 acre-feet or 138% of the five-year average
  • Silicon Valley Advanced Water Purification Center was completed and began delivery of high quality treated recycled water for blending with existing nonpotable water on March 25, 2014