http://www.dailyrepublic.com/news/solanocounty/berryessa-water-to-help-bail-out-napa-cities/
This is intersting. Solano County has to get water from Lake Berressa and shares it with Napa County. But Solano County and Sacramento County shares the Sacramento Delta has to negotiate with Southern California and San Joaquin Valley to export and ration water to deal with droughts and endangered species concerns.