As used in this chapter, unless the context requires a different meaning: “Farmer” means any person who derives at least 75 percent of his gross income from a farming operation in the Commonwealth as reported on his federal income tax forms the previous year, or a farmer who receives or is eligible to receive a federal loan and who owns or leases land that would be eligible for special tax assessments pursuant to Article 4 (§ 58.1-3229 et seq.) of Chapter 32 of Title 58.1. It shall not be necessary for any locality to adopt an ordinance pursuant to § 58.1-3231 in order to effectuate the provisions of this section relating to special tax assessments. “Major disaster” means any hurricane, flood, or drought that would warrant a disaster declaration request by the Governor pursuant to the provisions of Section 301 of Public Law 93-288, 42 U.S.C. § 5141.