The Metropolitan Water District of Southern California and two other water districts that agreed to fund the California Waterfix tunnel project announced today the formation of a public agency that will be charged with its design and construction. The MWD, which serves as a major supplier of water to the Los Angeles region, along with the Santa Clara Valley Water District and the Zone 7 Water Agency in the Bay Area, formed the Delta Conveyance Design and Construction Joint Powers Authority, or DCA, which will hold its first meeting on Thursday.