In this title the following words have the meanings indicated. “Board of managers” means the board of managers of a drainage association. “Board of viewers” means the board of drainage viewers established under this title. “Designated officer” means: the clerk of the county commissioners for a code county or commission county if there is a clerk for the county; or an employee or official of the county who is designated by the county commissioner or county council to perform the responsibilities of the designated officer under this title. “Drainage association” means a public drainage association established under this title. “Landowner” means a person who owns, or has contracted to purchase, land that is to be affected by a drainage project being considered by a drainage association or proposed drainage association.