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Monthly Water Tracker


As of April 1, 2018

We began calendar year 2018 with groundwater storage well within Stage 1 (Normal) of the District’s Water Shortage Contingency Plan. This year’s precipitation is below 60% of average to-date at the San Jose Index Station and below average for the Santa Cruz Mountains, South County, and the Diablo Range. The snow water equivalent for the Northern Sierra is less than 45% of normal for this date.

Despite below normal local rainfall and below normal statewide snow pack, end of year groundwater storage for 2018 is projected to be well within Stage 1 (Normal) due to carryover supplies from a wet 2017.

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Water Tracker April 2018.pdf 402.99 KB


  • Rainfall in Santa Clara County
  • Month of March, City of San Jose: 2.56 inches
  • Rainfall year total: 7.36 inches, 58% of average to date (Rainfall year is July 1 to June 30)
  • April 2 Northern Sierra snowpack: 43% of normal for this date    

Local Reservoirs

Current local reservoir storage

  • Total April 1 storage: 67,627 acre-feet

    • 61% of 20-year average for that date
    • 40% of total capacity
    • 60% of restricted capacity (169,009 acre-feet total storage capacity limited by seismic restrictions to 113,667 acre-feet)
  • Approximately 6,500 acre-feet imported water was delivered into local reservoirs during March 2018
  • Total estimated releases to streams (local and imported water) during March was 5,800 acre-feet


Groundwater Storage:  Total storage at the end of 2018 is predicted to fall within Stage 1 (Normal) of the district's Water Shortage Contingency Plan

Table of groundwater sub-basin levels for the month

Imported Water

  • As of March 29, 2018, the Statewide Average snowpack water content is 57% of the historic average for this date
  • 2018 State Water Project (SWP) and Central Valley Project (CVP) allocations:
    • The initial 2018 SWP allocation of 20%, providing 20,000 AF to the District
    • The initial 2018 South-of-Delta CVP allocations:
      • The M&I allocation is currently 70% and the Agricultural allocation is 20%, which provides 97,620 AF to the District
  • Reservoir storage information, as of March 29, 2018:
    • Shasta Reservoir at 84% of capacity (105% of average for this date)
    • Oroville Reservoir at 58% of capacity (77% of average for this date)
    • San Luis Reservoir at 86% of capacity (95% of average for this date)
  • District’s Semitropic groundwater bank reserves are 256,725 acre-feet as of February 28, 2018
  • Estimated SFPUC deliveries to Santa Clara County:
    • Projected month of February = 2,793 acre-feet
    • 2018 Total to Date = 5,950 acre-feet
    • Five-year annual average is 48,700 acre-feet

Treated Water

  • Below average demands of 5,349 acre-feet delivered in March
  • This total is 86% of the five-year average for the month of March
  • Year-to-date deliveries = 16,796 acre-feet or 96% of the five-year average

Conserved Water

  • Saved 72,000 acre-feet in FY17 from long-term program (baseline year is 1992)
  • Long-term program goal is to save nearly 75,000 acre-feet in FY18
  • 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 9% reduction in water use through the first two months of 2018, compared to 2013
  • Monthly Water Use Report

Recycled Water

  • Estimated March 2018 production = 600 acre-feet
  • Estimated Year-to-Date through March = 1,900 acre-feet or 60% of the five-year average
  • Silicon Valley Advanced Water Purification Center produced an estimated 1.3 billion gallons (4,000 acre-feet) of purified water in 2017. Since the beginning of 2018, about 700 acre-feet of purified water has been blended with existing tertiary recycled water for South Bay Water Recycling Program’s customers