Which term describes the flood that has a one percent chance of occurrence in any year?

The term that describes the flood with a one percent chance of occurring in any given year is known as the "Base flood." This term is used in floodplain management and is a crucial concept for understanding flood risks. The base flood is also commonly referred to as the "100-year flood," but the terminology can vary depending on context.

The base flood serves as a benchmark for flood insurance and land use planning under the National Flood Insurance Program (NFIP). It is used to determine flood elevations, assess flood hazards, and establish floodplain areas. It is important for communities to assess the likelihood of base floods when developing flood mitigation strategies and implementing regulations that can protect lives and property from flooding events.

In summary, referring to the flood that has a one percent annual chance of occurring as the base flood emphasizes its significance in the realm of floodplain management and reinforces its role in planning and risk assessment.