Section R. 323.1311 - DefinitionsRule 311. As used in this part:
(a) "A 100-year flood" means a flood with a magnitude which has a 1% chance of occurring or being exceeded in any given year.(b) "Department" means the Michigan department of environmental quality.(c) "Encroachment" means any structure, filling, grading, or deposition of materials in, upon, across, or projecting into, a floodplain, channel, or floodway.(d) "Flood" means a temporary increase in the stage of a river or stream resulting in the inundation of lands not normally covered by water.(e) "Floodplain" means that area of land adjoining a river or stream that will be inundated by a 100-year flood.(f) "Floodway" means the channel of a river or stream and the portions of the floodplain adjoining the channel that are reasonably required to carry and discharge a 100-year flood.(g) "Harmful interference" means causing an increased stage or change in direction of flow of a river or stream that causes, or is likely to cause, any of the following: (iii) A threat of personal injury.(iv) Pollution, impairment, or destruction of water or other natural resources.Mich. Admin. Code R. 323.1311