State officials Wednesday said they will press ahead with a smaller version of a long-planned water delivery project, initially building one, instead of two, massive tunnels in the heart of California’s vast waterworks. The decision to downsize California WaterFix boils down to money. The urban and agricultural water districts that are supposed to pay for the multibillion dollar project have only committed to enough funding for one water tunnel that would extend 35 miles under the Sacramento-San Joaquin Delta.