Whenever a nonconforming use of land, premises, building or structure, or any part or portion thereof, has been discontinued for a period of one year, the nonusage shall create a rebuttable presumption that the nonconforming use has been abandoned and, in the absence of proof, by a preponderance of the evidence, rebutting the presumption of abandonment, the nonconforming use shall not thereafter be reestablished, and all future uses shall be in conformity with the provisions of this chapter.