There is hereby created the Tombigbee Valley Authority composed of Clay, Itawamba, Lee, Lowndes, Monroe, Noxubee, Prentiss, Pontotoc, Alcorn, and Tishomingo Counties in the State of Mississippi, to be governed by a board consisting of one member from each such county and three members from the state at large, all to be appointed by the governor to serve for a term of four years or until their successors are appointed and qualified. The governor shall designate in his appointment the chairman and vice-chairman thereof. They shall serve without pay except for their actual traveling expenses and other necessary expenses incurred in the performance of their official duties, to be reimbursed as in the case of state employees under the provisions of general law. Upon appointment, said members shall meet and organize at Columbus, Mississippi, set a regular time and place for the meetings of the authority, secure offices and all necessary equipment, and obtain such engineering, professional, clerical, and other assistance as may be necessary in order to accomplish the purposes of this article. An executive director may be appointed by the board if this is deemed advisable, and salaries of all personnel may be paid out of funds provided under the terms of this article in an amount agreeable to the authority.