Section R. 280.1 - DefinitionsRule 1.
(1) "Apportionment" means that portion or share of the total cost of a drainage improvement, expressed as a percentage, to be borne by the assessed party by reason of benefits to a state highway or county road.(2) "Assessment" means the apportionment expressed as a monetary amount.(3) "County road" means a roadway, including the right-of-way, under the jurisdiction of a county road commission. It includes property contiguous to a roadway owned in fee or easement by the county which is used for highway purposes. It does not include facilities such as garage sites and office buildings that are not contiguous to the highway right-of-way.(4) "Department" means the Michigan department of highways and transportation.(5) "Drainage district" means the total area of land contributing storm water runoff to the drain or portion of the drain under consideration.(6) "Rainfall intensity" means the rate of rainfall in inches per hour.(7) "Runoff" means that part of the rainfall which drains off the land rather than being absorbed.(8) "Runoff coefficient" means the ratio of the rate of runoff to the rate of rainfall at an average storm intensity if all the drainage area is contributing.(9) "State highway" means a roadway, including the right-of-way, under the jurisdiction of the department which is part of a designated system of highways. It includes property contiguous to the highway owned in fee or in easement by the department which is used for highway purposes. It does not include facilities such as garage sites and office buildings that are not contiguous to the highway right-of-way.Mich. Admin. Code R. 280.1