From the San Francisco Chronicle:

Federal and state officials threw their support Wednesday behind the construction of two underground tunnels as the best option for restoring California's freshwater delta and meeting the needs of farmers and Southern California cities.

The diversion of water from the Sacramento-San Joaquin River Delta to croplands and urban areas has furthered the decline of the largest estuary in the West. Officials are trying to find a solution to reduce the ecological stress on the delta without harming the state's agricultural economy.

The tunnels would take about 10 years to construct.

The federal and state initiative drew immediate protests from environmental groups.

Delta twin-tunnels plan backed by U.S., Calif.