(b) The department shall adopt rules governing the use of land within the boundaries of the conservation district that are consistent with the conservation of necessary forest growth, the conservation and development of land and natural resources adequate for present and future needs, and the conservation and preservation of open space areas for public use and enjoyment; provided that no waste or disposal facility shall be located in a conservation district except in emergency circumstances where it may be necessary to mitigate significant risks to public safety and health; provided further that emergency circumstances shall not exceed three years. No use except a nonconforming use as defined in section 183C-5, shall be made within the conservation district unless the use is in accordance with a zoning rule. For the purposes of this subsection:
"Emergency" means any actual or imminent natural or human-caused occurrence that results or likely will result in substantial injury or harm to the population or substantial damage to or loss of property.
"Waste or disposal facility" means any transfer station or landfill as defined in section 340A-1, open dump as defined in section 342H-1, solid waste reduction facility or waste reduction facility as defined in section 342G-1, disposal facility, or any other facility for the disposal of solid waste that is required by law to obtain a permit from the department of health. "Waste or disposal facility" excludes individual, state certified, non-industrial redemption centers.