The board may charge a reasonable fee to each vessel arriving in ballast or carrying cargo of any kind. It may also charge for each copy of any certificate issued by it or its deputies for inspecting hatches, surveying cargoes and the like. The master of each vessel shall, however, be furnished free one copy of all surveys upon his vessel or cargo.
The board may, when necessary, levy annually an ad valorem tax not to exceed five mills on the dollar on the property subject to taxation situated in the district. All funds derived under this paragraph shall be used to defray the administrative, operative and maintenance expenses of the board.
The board may likewise borrow money for the said purposes from time to time and issue certificates of indebtedness secured by any fees and the tax, provided that such loan shall in no year exceed the estimated revenues for such year.