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Less water might be plenty for California, experts say, and conservation is only the start

Across California this summer, residents have been racking up water conservation numbers that defy expectations — a 27% reduction in June, followed by 31.3% in July.

Perhaps more impressive than the percentage figures, however, is the actual volume of water saved over two months: 414,800 acre-feet.

That's a lot of water — more than twice the amount projected to be available annually from two proposed storage facilities that would cost a combined $3.5 billion to build: the Temperance Flat Dam on the San Joaquin River and an expansion of Shasta Dam.

The conservation performance raises a host of possibilities, and profound questions, for water policy analysts and managers as they contemplate California's hydrological future in an era of climate change and increased competition for an essential natural resource.