Tex. Parks & Wild. Code § 21.020

The commission may provide by resolution for the issuance of refunding bonds. The department may sell these bonds and use the proceeds to retire the outstanding bonds issued under this chapter, including interest accrued on outstanding bonds, or the department may exchange refunding bonds for outstanding bonds, including accrued interest. The issuance of the refunding bonds, their maturity, the rights of the bondholders, and the duties of the department with respect to refunding bonds are governed by the provisions of this chapter relating to the original bonds, to the extent they are applicable and by refunding statutes of general application not in conflict with the provisions of this chapter.