Which of the following best defines "floodplain wetlands"?

The definition of "floodplain wetlands" focuses on their unique ecological role in river systems. Floodplain wetlands are specifically characterized by their ability to flood intermittently during high water events, such as during spring thaws or heavy rainfall. This seasonal flooding is crucial because it enhances biodiversity by providing essential habitats for various plant and animal species, while also acting as natural storage areas for excess water. This helps to mitigate flooding downstream and improve water quality.

The natural processes that occur in floodplain wetlands make them vital components of a healthy ecosystem. They filter pollutants, provide nursery grounds for fish, and offer a dynamic environment for numerous wildlife species. Thus, the defining feature of floodplain wetlands is their cyclical flooding, which is integral to their function and significance in watershed management.