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Water Tracker
A monthly assessment of trends in water supply
and use for Santa Clara County, California
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As of May 1, 2013
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As a dry winter has turned into a dry spring, the prospects for increased local and imported supplies have diminished. Locally, the rainfall at the San Jose gauge has been the lowest January through April total since record keeping began in 1874. Very dry conditions have also continued in the Sierras, resulting in snowpack levels that are much lower than average. However, the district has stored water reserves in local reservoirs, the local groundwater basin, and in the Semitropic Groundwater Bank in Kern County to draw upon during dry years and emergencies. The district has also invested in a diverse water supply portfolio including long term conservation programs, recycled water, and water transfer options. This diverse portfolio, as well as withdrawals from reserves, will help meet water supply reliability objectives this year.
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Rainfall in San Jose:
Month of April = 0.2 inches Combined January, February, March and April 2013 was the driest January through April on record (going back to 1874) Total-to-date = 8.74 inches or 63% of average to date (Rainfall year is July 1 to June 30)
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Total May 1 storage = 82,221 acre-feet
(Click here for current local reservoir storage)
- 65% of 20-year average May 1 storage
- 49% of total capacity
- 67% of restricted capacity storage
(169,009 acre-feet total storage capacity limited by seismic restrictions to 122,924 acre-feet)
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- 2013 State Water Project and Central Valley Project allocations = 132,620 acre-feet
- State Water Project allocation: 35% = 35,000 acre-feet (no change in SWP aallocation in April )
- Central Valley Project allocations: 70% for Municipal and Industrial uses, 20% for Irrigation = total of 97,620 acre-feet (no change in CVP allocation in March)
- Reservoir storage information (map) (table) as of May 1, 2013:
- Shasta Reservoir at 95% of average for this date
- Oroville Reservoir at 103% of average for this date
- San Luis Reservoir at 60% of average for this date
- Daily reservoir storage summary (map) (table), current
- 307,665 acre-feet banked in Semitropic (88% full)
 Exchanges and transfers executed in FY 13- Estimated Hetch Hetchy deliveries to Santa Clara County (click to enlarge graph at right):
- Month of April = 2,900 acre-feet
- Total-to-date = 12,300 acre-feet, or 97% of the five-year average
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Groundwater storage: Groundwater Storage: Total storage at the end of 2013 is projected to be 326,000 acre-feet, within the normal range.
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Santa Clara Plain
- The April managed recharge estimate is 5,000 acre-feet. The year-to-date managed recharge estimate is 17,000 acre-feet or 104% of the five-year average
- The April groundwater pumping estimate is 5,100 acre-feet. The year-to-date groundwater pumping estimate is 18,000 or 87% of the five-year average
- The groundwater level in Santa Clara Plain (San Jose) is lower than last year and 5 feet higher than the five year average |
Coyote Valley
- The April managed recharge estimate is 1,100 acre-feet. The year-to-date managed recharge estimate is 4,200 acre-feet, or 108% of the five-year average
- The April groundwater pumping estimate is 900 acre-feet. The year-to-date groundwater pumping estimate is 3,100 acre-feet, or 98% of the five-year average
- The groundwater level in Coyote Valley is lower than last year and 6 feet lower than the five-year average |
Llagas Subbasin
- The April managed recharge estimate is 1,700 acre-feet. The year-to-date managed recharge estimate is 6,500 acre-feet, or 89% of the five-year average
- The April groundwater pumping estimate is 2,400 acre-feet. The year-to-date groundwater pumping estimate is 8,000 acre-feet, or 99% of the five-year average
- The groundwater level in Llagas Subbasin (San Martin) is lower than last year and 6 feet lower than the five-year average |
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 Above average demands of 11,100 acre-feet delivered in April, which is 126% of the five-year average
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Estimated 2012 total County water use of 347,000 acre-feet increased by 5% from 2011, however it’s still nearly 10% lower than pre-recession years. - Goal is to save 57,000 acre-feet in FY13 from long-term program (baseline year is 1992)
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 Estimated April 2013 production = 1,500 acre-feet (recycled water is billed on a semi-annual basis)
- Estimated total-to-date in 2013 = 5,294 acre-feet or 166% of the five-year average (2008-2012) total-to-date
- Silicon Valley Advanced Water Purification Center is in construction and expected completion by August 2013
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