For the payment of all or part of the costs of a park improvement project or park services, the board may issue bonds in one or more series payable from and secured by ad valorem taxes, revenues, grants, gifts, contracts, leases, or any combination of those funds. Bonds may be liens on all or part of the revenue derived from park improvements or services authorized under this chapter.
Tex. Spec. Dist. Loc. Laws § 3873.202