Mich. Comp. Laws § 280.157
The board of review shall proceed at the time, date, and place specified in the notice to hear the proofs and allegations of the parties in respect to an appeal, shall proceed to view the lands benefited by the drain and shall review the apportionments made by the commissioner on the drain. If in their judgment there is a manifest error or inequality in the apportionments they shall order and make the changes in the apportionment as they may consider just and equitable. If the board of review upon personal examination finds that a land liable to be assessed for the construction of the drain is not included in the drainage district made by the commissioner, they shall add the land to the drainage district of the drain and shall adjourn the review to another time or place as they consider proper, but not in all more than 20 days from and after the time of review first advertised. The notice of the adjournment shall contain a description of lands added to the drainage district. The notice shall be given at least 10 days before the adjourned day of review. Should the owners of land liable to an assessment be nonresidents of the county, personal notice shall be served on the owners, or a notice shall be published in a weekly newspaper published in the county, of at least 2 insertions, giving the description of the land added to the assessment district and giving the time, date, and place where the board shall meet. The action and decision of the board shall be final. The action and decision shall be reduced to writing and signed by a majority of the board making the decision, and shall be delivered to the commissioner together with other papers relating to the decision.
MCL 280.157