Whenever such additional levy for dredging, canal construction, or land leveling or filling purposes shall have been authorized by the electors of the district at an election, held subsequent to the time of making the levy for the district for general purposes, in any year, such levy shall be certified by the port commission in the manner provided by law for certifying levies for general purposes of the district, and shall be forthwith spread and extended upon the tax rolls for the current year, and the taxes so levied and extended shall be collected in the manner provided by law for the collection of general taxes.

Collection of taxes, generally: Chapter 84.56 RCW.