Mich. Comp. Laws § 280.200
In lieu of assessing the cost of the maintenance and repair of any drain to parcels of land in the drainage district within any city, village, township, charter township or county, the commissioner or drainage board may contract relative to such cost with any city, village, township, charter township or county in which the drain, or any part thereof, is located, or whose residents use the drain for drainage or for the transportation of sewage. In the contract any city, village, township, charter township or county may agree (1) to pay annually to the commissioner or the drainage board certain sums for the cost of maintenance and repair of any drain and for the creation of a reserve fund therefor, or (2) to provide such sums periodically as needed, or (3) to reimburse the commissioner or drainage board for all sums expended for maintenance and repair, or (4) for any combination of the foregoing. The contract shall be approved and its execution authorized by a resolution adopted by the legislative body of the city, village, township, charter township or county and shall be executed by the commissioner or drainage board on behalf of the drainage district. The city, village, township, charter township or county may fulfill its obligation to pay in accordance with the terms of the contract out of its general funds, service charges to its residents, or any other legally available funds. The contract shall specify the manner in which the obligation to pay shall be fulfilled.
MCL 280.200