Mich. Comp. Laws § 101.3: Board of public works; drainage construction plan.

Sec. 3.

Whenever it may become necessary, in the opinion of the council, to provide sewerage and drainage for the city or for any part thereof, it shall be their duty to instruct and direct the board of public works to devise, or cause a plan of such sewerage or drainage to be devised, for the whole city, or for such part thereof as they shall determine.