Cal. Water Code § 12627

It is the intention of the Legislature that the department shall investigate all phases of any proposed water project, including flood control, water conservation, domestic and irrigation use, and power development, but not excluding other uses, so that a county, city, state agency, or public district affected, and the Legislature, may have the benefit of investigations and recommendations of the department upon such projects in order to assure the fullest development of the water resources of the State.