Payment for the work done under this article shall be made in the manner provided by law for the payment of claims against counties. Upon satisfactory evidence being presented to the department that the work done conforms to its requirements, the department shall pay, in the manner provided by law, its pro rata share of the cost of the work as agreed upon. Such payment shall be made out of any funds available to the department for such purposes.
Ca. Sts. and High. Code § 798