Which formats were used for maps published with a Flood Insurance Study (FIS) before 1986?

The correct choice reflects the historical context and evolution of flood mapping under the National Flood Insurance Program (NFIP). Before 1986, the maps used for Flood Insurance Studies (FIS) were referred to as the "Old format" Flood Insurance Rate Maps (FIRMs) and Flood Boundary and Floodway Maps (FBFMs).

These old format maps were foundational in communicating flood risk and floodplain boundaries to the public, affecting insurance requirements for properties within designated flood zones. They served as critical tools for planning, development, and mitigation efforts prior to the implementation of the new formats that were adopted later.

Over time, mapping technology and methodologies advanced, leading to the introduction of the new format maps, which became more detailed and incorporated enhanced data visualization. However, the distinction between the old and new formats is significant in that it marks a transition in how flood risk was represented and communicated, making the identification of the older formats relevant for understanding historical floodplain management practices.