From the Introduction: "The Disaster Relief Fund (DRF) is one of the most-tracked single accounts funded by Congress each year. Managed by the Federal Emergency Management Agency (FEMA), it is the primary source of funding for the federal government's domestic general disaster relief programs. [...] This report introduces the DRF and provides a brief history of federal disaster relief programs. It goes on to discuss the appropriations that fund the DRF, and provides a funding history from FY1964 to the present day, discussing factors that contributed to those changing appropriations levels. It concludes with discussion of how the budget request for the DRF has been developed and structured, given the unpredictability of the annual budgetary impact of disasters, and raises some potential issues for congressional consideration."
CRS Report for Congress, R45484
Congressional Research Service: https://crsreports.congress.gov/