Three months ago, Santa Clara County’s largest water agency voted to kill a $3.2 billion plan to build a huge new reservoir in the southern part of the county near Pacheco Pass.

The Pacheco Reservoir would have been the largest new reservoir built in the Bay Area since 1998 when Los Vaqueros Reservoir was constructed in eastern Contra Costa County.

But soaring cost overruns, a lack of interest among other water agencies to help pay construction costs and share the water, and a decision by the federal Bureau of Reclamation not to allow water from federal projects to be stored in the reservoir, marked the end.

Now the Santa Clara Valley Water District is back with new plans to boost water storage. This week, the district, a government agency in San Jose that provides water to 2 million So

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