According to FEMA, homes must be situated above which floodplain year?

The correct answer is based on the Federal Emergency Management Agency (FEMA) guidelines, which indicate that homes should be built above the 100-year floodplain. This classification refers to the floodplain's statistical probability, where there is a 1% chance of flooding occurring in any given year. Designing homes above this threshold is an important practice for mitigating the risks associated with flooding.

Building within the 100-year floodplain can lead to increased vulnerability to flood damage, insurance costs, and potential loss of property. By adhering to the 100-year standard, communities demonstrate a commitment to safety and sustainability, thus reducing risks for homeowners and infrastructure in potentially flood-prone areas.

While the other options refer to longer time frames, they are not standard benchmarks set forth by FEMA for floodplain requirements, making the 100-year standard the relevant criterion for ensuring proper flood risk management.