During California’s recent five-year drought, it was common to hear people asking why the state doesn’t build more dams. On Tuesday, flush with cash from voters, the administration of Gov. Jerry Brown is expected to finally do just that, committing nearly $1 billion to build two huge dam projects in the Bay Area, and another $1.5 billion for six more big water projects from the Sacramento Valley to Bakersfield. The California Water Commission, whose eight members are appointed by the governor, will likely vote to fund $2.5 billion overall for the eight projects — four new dams and four groundwater storage proposals.