(a) The board may use the fund to provide financial assistance to an eligible political subdivision to enable the political subdivision to fund loans and grants for projects that conserve and develop the water resources of the political subdivision for the ultimate benefit of the public, and that develop and diversify its local economy, consistent with the terms and conditions set forth in a program adopted by the governing body of the political subdivision under authority granted by Section 15.980.
(b) The board may not purchase political subdivision bonds issued for the purposes described by Subsection (a) that are secured in whole or in part by a pledge of ad valorem taxes unless the political subdivision submits evidence satisfactory to the board that the issuance of the bonds has been approved by the citizens of the political subdivision voting at an election held for the purposes described in Section 15.980.