Proposed changes to a plan that is supposed to guide the Delta through the 21st century have advocates on red alert, as they worry that the new language locks in Gov. Jerry Brown’s $15 billion twin tunnels. The revised plan does not explicitly endorse the California Water Fix, as the tunnels proposal is formally known. It does, however, promote building one or more new intakes to pump water from the Delta, with a new underground conveyance system that would be operated in tandem with existing Delta channels. The twin tunnels proposal satisfies all of those criteria.