Section 30. All moneys actually in the treasury to the credit of the fund from which they are to be drawn, and all moneys applicable to the payment of the obligation or appropriation involved that are anticipated to come into the treasury before the maturity of such contract, agreement, or obligation, from taxes, assessments, license fees, water rents, or from any other source, as well as moneys to be derived from lawfully authorized bonds sold and in the process of delivery, for the purposes of such certificate shall be deemed in the treasury to the credit of the appropriate fund and shall be subject to such certification.