The $17 billion “California WaterFix” project reached a tipping point Tuesday after a Silicon Valley water district voted against Gov. Jerry Brown’s approach in favor of a less expensive, scaled-back version. The San Jose-based Santa Clara Valley Water District agreed to “conditionally support” California WaterFix – a plan to divert water from the Sacramento-San Joaquin River Delta through a pair of 40-foot-wide, 35-mile-long tunnels – but said the state will have to consider cheaper alternatives before the district can commit hundreds of millions to the water project.