(a) With the consent of the bondholders, a district may refund outstanding bonds by issuing new coupon bonds in their place.
(b) Interest is shown by coupons attached to the bonds, and the commissioners court of jurisdiction shall determine whether the board will pay the interest on the bonds annually or semiannually.

(c) The board may pay the refunding bonds serially or in any other manner they choose, but, except as provided in Subsection (d) of this section, they shall pay the bonds not later than 40 years from the date the bonds are issued.
(d) A district that taxes on the benefit basis and that is located in a county with a population of over 1.3 million may refund outstanding bonds or matured interest coupons on bonds issued by the district with new coupon bonds payable not more than 75 years from their date.
(e) The district shall issue the bonds in denominations of $100 or a multiple of $100 and, before the bonds are delivered, shall levy a tax sufficient to pay the principal of and interest on the refunding bonds. The refunding of bonds does not affect any taxes already due.
(f) The board shall issue refunding bonds in the manner provided for other district bonds.
(g) The board shall deduct any money on hand in the sinking fund account to ascertain the amount of refunding bonds to be issued and shall apply the money to the payment of the outstanding bonds.
(h) The board may not issue refunding bonds until they are approved by the attorney general and registered by the comptroller, and the comptroller shall not register the refunding bonds until the old bonds being replaced are presented to him for cancellation. After the comptroller registers the new bonds, he shall cancel the old bonds and interest coupons and deliver the new bonds to the proper bondholders. The old bonds may be presented for cancellation in installments, and the comptroller may register and deliver a like amount of the new bonds.