Upon the entry of an order creating such waterway district by the board, it shall have power to perform all the duties and exercise all of the authority conferred upon it by this chapter, and shall have the right to sue and be sued in all matters pertaining to such district as the representative thereof, in the same manner and to the same extent as in all other county affairs. But such district shall bear all the expenses of such action on the part of the board, and the county shall be at no expense or charge therefor.