Ind. Code § 36-9-11.1-15
(j) Notwithstanding any other law, the authorizing resolution or ordinance may provide for a pledge of all or a certain designated part of the gross or net revenues derived from:
(5) any federal and state grants and distributions not dedicated or restricted by law to other purposes, to the payment of principal of and interest on revenue bonds issued or to be issued under this chapter and the accumulation and maintenance of the reserve for them, to the extent and in the manner provided in the resolution or ordinance authorizing the issuance of the bonds.
If such a pledge is made, it is irrevocable so long as any of the bonds on account of which the pledge is made are outstanding, and the pledge takes precedence over any budget provision or appropriation payable out of unobligated revenues so pledged where the provision or appropriation is made after the authorization of the pledge by the legislative body.
(p) If the proceeds of the bonds of any issue, by error of estimates or otherwise, are less than the cost, additional bonds may in like manner be issued to provide the amount of the deficit. Unless otherwise provided in the resolution authorizing the issuance of the bonds, the additional bonds shall be considered to be of the same issue and shall be entitled to payment from the same fund without preference or priority of the bonds first issued. If the proceeds of the bonds of any issue exceed the cost of the parking facility or facilities on account of which they have been issued, the surplus shall be deposited in the fund or account from which the bonds are payable.
As added by Acts 1982, P.L.77, SEC.13.