(a) On compliance with the provisions of this subchapter the district may issue bonds to pay for the improvements and facilities and to acquire the property authorized in this subchapter.(b) The district also may issue bonds to purchase wharves, docks, warehouses, bunkering facilities, belt railroads, land to be used for port purposes and development, or other facilities constructed or owned by the municipality.(c) An election shall be held to approve the issuance of the bonds, and the bonds shall be issued in the manner provided by this chapter for issuing other bonds.(d) The outstanding bonds and the additional bonds may not amount to more than 10 percent of the assessed value of real property in the district as shown by the last annual assessment made for the county and state. Acts 1971, 62nd Leg., p. 110, ch. 58, Sec. 1, eff. 8/30/1971.