Section R. 560.204 - DrainageRule 204.
(1) When a proposed plat would alter the existing drainage of a state trunk line highway, the department of state highways shall request in conjunction with the preliminary plat submittal, sufficient information to determine in what way the highway drainage would be affected and shall inform the proprietor, in writing, of the drainage requirements. Final plat approval shall be conditioned upon meeting these requirements. The drainage requirements shall be based upon the department of state highways' drainage policy and guide. These requirements will be revised as necessary with the most recent dated sheets being applicable.(2) Before approving a final plat and when construction of drainage facilities is completed and the department has received written notice thereof, the department within 20 days shall inspect the construction and either approve or disapprove it giving written reasons in case of disapproval. In lieu of such construction, the department shall accept a certified check, irrevocable bank letter of credit, or a surety bond acceptable to the department, whichever the proprietor selects.Mich. Admin. Code R. 560.204