Tex. Water Code § 51.808

The order issuing the bonds shall provide that any of the bonds with all unmatured interest and all appurtenant coupons may be surrendered at any time in payment of all unpaid installments of the taxes. The amount of taxes found to be due by the method provided in Section 51.809 of this code may be discharged by the surrender of the proper amount of dissolution bonds, together with all unpaid appurtenant interest coupons at the face value of the bonds and coupons.