From the LA Times. The economic analysis says that the $25 billion tunnel project will actually come out ahead by $5 billion in a cost/benefit analysis.
And there's this:
"The report also concluded the tunnel project would generate $83.5 billion in statewide business activity over its 50-year life by averting further water delivery cuts and creating construction and maintenance jobs."
Opponents of the tunnel project are more than a little skeptical.