Mich. Comp. Laws § 102.13: Removal of soil; street openings.

Sec. 13.

The council may regulate the making of all openings in, and removals of, the soil of public streets, and for the laying or repair of sewers, drains, tunnels, gas pipes, water pipes, or for any other purpose; and may prohibit and prevent all such openings, and removals of the soil, except by express permission of the council, and at such times and upon such terms and regulations as they may prescribe.