Butte County plans to file a lawsuit over the plan to bury a pair of tunnels under the Sacramento-San Joaquin Delta to move Sacramento River water south. County supervisors voted unanimously Tuesday to file the suit against the Department of Water Resources over the so-called “California WaterFix,” the largest part of which is the “twin tunnels” proposal. The California WaterFix is technically a Habitat Conservation Plan and Natural Community Conservation Plan, with the stated goal of protecting more than 50 species of fish, wildlife and plants over 50 years.