LOS ANGELES (AP) – One tunnel or two? A week after Southern California’s largest water agency abandoned a plan to pay for much of the state’s ambitious water project, the funding debate begins again. The Metropolitan Water District board will vote Tuesday on whether to approve $5 billion in funding for a single tunnel that would overhaul the state’s north-south water system – or OK nearly $11 billion to help finance the construction of two tunnels. Gov. Jerry Brown on Monday sent a letter urging the board to back the two-tunnel plan, which he’s been supporting for years. In February, his administration agreed to trim the project down from two tunnels to one, in an effort to line up enough funding and ease environmental concerns.