The law requires that assessments be based on benefit derived as determined by the Drain Commissioner. All properties within the drainage district are assessed considering factors such as size of the parcel, land use, proximity to the drain, and location of the property within the district. Drainage is considered as an interdependent system with the entire system benefiting from maintenance of the common outlet.
Due to newer data and updated technology a parcels benefit derived from a drain may also include the type of land cover within that parcel. Land cover may include a parcels agricultural use, developed area related to residential and commercial use, and natural area such as grassland, forest and wetlands.