print Font Size: small font medium font large font

Water Tracker

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

 

As of May 1, 2017

blue arrow big

January and February storms generated extraordinarily large flows in local creeks, and District reservoirs are currently at 106% of average for this date.

On January 31, 2017, the Board of Directors (Board) approved a resolution calling for 20 percent reduction and continued certain water waste prohibitions, but removed the recommendation that retailers implement mandatory measures. The Board also called for continued restrictions on watering schedules to a maximum of three times a week.

On April 7, 2017, the Governor issued an Executive Order (EO) ending the drought state of emergency for a majority of the state. In response to the EO, the State Board recently rescinded their mandatory conservation and stress test requirements, however they are continuing with the water use prohibitions and monthly reporting for urban water retailers.

Groundwater recharge in 2016 was far greater than in normal years. Preliminary water supply analysis shows that 2017 District recharge, together with natural recharge, will sustain or further improve groundwater storage in 2017.

 


 


Weather

yellow trans arrow

Rainfall in San Jose:

  • Month of April = 1.62 inches
  • Rainfall year to date = 17.17 inches (Rainfall year is July 1 to June 30)
  • Normal rainfall for the full year = 14.33 inches
  • May 2 Northern Sierra snowpack was 198% of normal for this date      
 
 


Local Reservoirs

yellow trans arrow

  • Total May 1 storage = 122,279 acre-feet
    (Click here for current local reservoir storage)
    • 106% of 20-year average for that date
    • 72% of total capacity
    • 99% of restricted capacity
      (169,009 acre-feet total storage capacity limited by seismic restrictions to 122,924 acre-feet)
  • No imported water was delivered into local reservoirs during April 2017
  • Total estimated releases to streams (local and imported water) during April was 41,020 acre-feet
 
 


Groundwater

 

blue trans arrow

Groundwater Storage:  Total storage at the end of 2017 is predicted to fall within 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

yellow trans arrow 
  • As of May 1, 2017, the Statewide Average snowpack water content is 196% of the historic average for this date
  • 2017 State Water Project (SWP) and Central Valley Project (CVP) allocations:
    • 2017 SWP allocation: 85% announced on April 14, 2017, provides 85,000 acre-feet.  See link to Press Release
    • 2017 South-of-Delta CVP allocations announced on April 11, 2017.  See link to Press Release
      • M&I water service allocation:  100%, District's M&I allocation is 119,400 AF
      • Agricultural water service allocation:  100%, or 33,100 AF
  • Reservoir storage (map) (table), as of May 1, 2017: 
    • Shasta Reservoir at 94% of capacity (109% of average for this date)
    • Oroville Reservoir at 74% of capacity (91% 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 98% of capacity (110% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • District's Semitropic groundwater bank reserves: An estimated 199,839 acre-feet as of May 2, 2017
  • Estimated SFPUC deliveries (graph) to Santa Clara County
    • Month of April = 3,135 acre-feet
    • 2017 Total to Date = 11,733 acre-feet
    • Five-year annual average is 48,700 acre-feet
 
 

Treated water 

blue trans arrow

  • Treated Water DeliveredBelow average demands of 6,854 acre-feet delivered in April
  • This total is 89% of the five-year average for April
  • Year-to-date estimated = 23,630 acre-feet or 86% of the five-year average

 

 
 

 
Conserved water

 

green arrow
  • /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 24% reduction in water use through the first three months of  2017, compared to 2013
 
 


Recycled
water

green arrow

  • Recycled WaterEstimated April 2017 production  =  1,100 acre-feet
  • Estimated year-to-date through April = 3,377 acre-feet or 73% of the five-year average
  • Silicon Valley Advanced Water Purification Center produced an estimated 1.3 billion gallons (3,900 acre-feet) of purified water in 2016.  Since the beginning of 2017, about 600 acre-feet of purified water has been blended with existing tertiary recycled water for South Bay Water Recycling Program's customers