From the Document: "The U.S. Department of Agriculture (USDA) offers several programs to help farmers recover financially from natural disasters, including drought and floods. All the programs have permanent authorization, and one requires a federal disaster designation (the emergency loan program). Most programs receive mandatory funding amounts that are 'such sums as necessary' and are not subject to annual discretionary appropriations."
CRS Report for Congress, RS21212
Congressional Research Service: https://crsreports.congress.gov/