The governor’s $68 billion California Delta twin water tunnels project cannot be economically justified, says a new report from the University of the Pacific. The tunnels scheme, promoted by Gov. Edmund Brown Jr. as one of his legacies to the people of California, would be the most costly water proposal in California history, the report says. But the new independent research, released Wednesday, shows that the tunnels’ costs are four times larger than its benefits, “and thus the project is not is not economically justified.”