Indiana Code Title 36. Local Government § 36-9-11.1-17

Sec. 17. (a) All gifts, donations, bequests, devises, and proceeds derived from the sale of bonds, from the disposition of property, or any payments received or paid to the department for off-street parking purposes shall be delivered to the fiscal officer of the consolidated city.  The fiscal officer shall deposit them to the credit of the department, for the account for the parking facility entitled to them, or to its general fund, if not so allocated.  All money remaining in each separate parking facility fund and in the general fund at the end of each calendar year continues to belong to those respective funds for use as provided in this chapter.  All deposits of the department shall be kept in duly designated depositories for funds of the city.

(b) Separate books of account shall be kept for each parking facility so long as there remain outstanding any bonds issued on account of the acquisition or improvement of the facility.  All net revenues derived from any parking facility that are pledged to the payment of the interest on and principal of certain bonds shall be deposited in a separate special account appropriately set up and designated.  The money in these accounts shall be used solely for the payment of the interest on and principal of the respective bonds as they fall due, and for no other purposes, until the account contains an amount sufficient to pay the interest on and principal of all bonds payable during the then current calendar year and the interest on and principal of the bonds that will become due during the next succeeding calendar year.  Any amount in excess of the amount required for that purpose may be used in the purchase of bonds of that issue, if they can be purchased at less than the then current redemption price, or if not, then for the redemption of outstanding bonds of that issue in accordance with their provisions, all as directed by the board.