Ind. Code § 36-10-3-26

Sec. 26. All proceeds from the sale of bonds issued under section 24 of this chapter shall be kept in a separate fund. The fund shall be used to pay for land and other property acquired and for the construction of a work under the resolution, including all costs and expenses incurred in connection with the project. The fund may not be used for any other purpose. The fund shall be deposited as provided in this chapter. A surplus remaining from the proceeds of the bonds after all costs and expenses are paid shall be paid into and becomes a part of the park district bond fund.