Sec. 12. (a) If the board acquires a storm water system and assumes the liability incurred by the seller to construct the storm water system, the principal and interest on the liability so assumed shall be paid from the bond and interest redemption account in the same manner as bonds of the district would be paid, and the board shall set aside sufficient revenues to comply with the requirements of the instrument creating the liability.
(b) A unit acquiring a storm water system may not assume any liability for the payment of a secured debt or charge other than the obligation to apply the revenues in the manner prescribed in the ordinance.
(c) The board may issue bonds in exchange for, or satisfaction of, the liability assumed in the acquisition of a storm water system. The bonds so issued may not be issued at less than ninety-seven percent (97%) of the par value thereof in exchange for, or satisfaction of, the liability. Notwithstanding section 13(c) of this chapter, bonds issued in exchange for, or satisfaction of, the liability need not be sold in accordance with IC 5-1-11. However, the interest rate on such bonds may not exceed the average yield on municipal revenue bonds of comparable credit rating and maturity as of the end of the week immediately preceding the issuance of the bonds.