Whenever the public necessity, convenience and general welfare require, the Kenosha County Board of Supervisors may, by ordinance, amend any part of the Ordinance. Such amendments may include reclassification or rezoning of property, changes in district boundaries, or changes in the text of this Ordinance. Such amendments shall be enacted in accordance with the provisions of the Wisconsin Statutes and this Ordinance. The determination of when the public interest re-quires a change in the zoning ordinance shall remain within the discretion of the Kenosha County Board of Supervisors. Amendments may also be made upon a showing of a mistake or error on the part of the Kenosha County Department of Planning and Development. [Code § 12.38-2.]