Ga. Const. art. IX, § 5, para. 2

Any county, municipality, or political subdivision of this state may incur debt on behalf of any special district created pursuant to Paragraph VI of Section II of this article. Such debt may be incurred on behalf of such special district where the county, municipality, or other political subdivision shall have, at or before the time of incurring such debt, provided for the assessment and collection of an annual tax within the special district sufficient in amount to pay the principal of and interest on such debt within 30 years from the incurrence thereof; and no such county, municipality, or other political subdivision shall incur any debt on behalf of such special district without the assent of a majority of the qualified voters of such special district voting in an election held for that purpose as provided by law. No such county, municipality, or other political subdivision shall incur any debt on behalf of such special district in an amount which, when taken together with all other debt outstanding incurred by such county, municipality, or political subdivision and on behalf of any such special district, exceeds 10 percent of the assessed value of all taxable property within such county, municipality, or political subdivision. The proceeds of the tax collected as provided herein shall be placed in a sinking fund to be held on behalf of such special district and used exclusively to pay off the principal of and interest on such debt thereafter maturing. Such moneys shall be held and kept separate and apart from all other revenues collected and may be invested and reinvested as provided by law.