The Port District has the continuing power to borrow money for the purpose of acquiring, constructing, reconstructing, extending or improving terminals, terminal facilities, port facilities and transportation facilities thereto, and for acquiring any property and equipment useful for the construction, reconstruction, extension, improvement or operation of its terminals, terminal facilities and port and transportation facilities, and for acquiring necessary cash working funds. To evidence the obligations of the District to repay any money borrowed the Port District, pursuant to ordinance adopted by the Board from time to time may issue and dispose of its interest bearing revenue bonds or certificates and may also from time to time issue and dispose of its interest bearing revenue bonds or certificates to refund any bonds or certificates at maturity or pursuant to redemption provisions or at any time before maturity with the consent of the holders thereof.