Md. Code, Local Government § 26–804

(a) (1) The board of managers may impose a special assessment on the

public and private benefited land for maintenance of a drainage project constructed

under this title.

(2) If the board of managers requests, the county commissioners or

county council may appoint a board of viewers to evaluate changes in land use made

after the original determination for a drainage project.

(3) The board of managers may use the evaluation report as a basis

to impose a special assessment for maintenance of a drainage project.

(b) The special assessments under this section shall be imposed and

disbursed in the same manner as provided for other special assessments under this

subtitle, except that the board of managers may, at any time, determine which land

is classified as woodland, cropland, commercial, industrial, or residential.