For bonds authorized to be issued that are secured by and payable wholly or partly from net revenues, the board may mortgage and encumber:
(1) any part or all of the district's property and facilities acquired or to be acquired;
(2) a franchise of or revenues from the operation of the district's property and facilities acquired or to be acquired; and
(3) anything pertaining to the district's property and facilities acquired or to be acquired or the operation of the district's property or facilities.