An Open Space Preservation District is established in the zoning code to provide areas in which the principal use of the land is devoted to open space and/or the preservation and protection of park and recreation lands, wilderness areas, beach and shoreline areas, scenic routes, wild and scenic rivers, historical and archaeological sites, watersheds and water supply areas, and wildlife and their habitats. Property classified under this district must meet the criteria set forth in the open space plan of the City of Knoxville and such property will be assessed under “The Greenbelt Law”.