Cal. Wat. Code § 12585
In the event that the Congress after September 22, 1951, authorizes and approves projects, wherein financial assistance is required of local agencies of this State by the Federal Government, similar to the provisions of Public Law, Numbered 534, Seventy-eighth Congress, Second Session, and such projects are recommended for state assistance by the department and approved by the Legislature, including all projects adopted and authorized by the State for which no appropriations or allocations have been made, it is the intention of the Legislature that it will be the policy of the State to pay the costs of local cooperation required by the acts of Congress, except that such costs shall be limited to the costs of all lands, easements and rights of way necessary for the construction of such projects.
Ca. Water Code § 12585