The floodplain restoration case study argues that restoration can...

• A. Be irrelevant to flood risk.
• B. Restore ecosystem services and reduce flood risk when designed with local knowledge.
• C. Increase flood risk.
• D. Replace engineered infrastructure entirely.

Answer: (C)

The key idea here is that floodplain restoration can act as a natural buffer that both restores ecosystem services and helps reduce flood risk, but only when the design leverages local knowledge. Floodplains are became functioning parts of the river system when they’re allowed to reconnect with the river—water can spread out over a wider area, move more slowly, and be stored in the landscape rather than rushing straight downstream. This attenuation lowers peak flood stages downstream and provides space for floodwaters to expand safely.

Incorporating local knowledge is crucial. Communities know where water tends to pool, which areas are most sensitive to flooding, and how land use, soils, and vegetation affect hydrology. Using that information helps planners choose which areas to restore, how to shape the terrain, and what plant communities to reestablish. The result is not just a prettier landscape, but multiple benefits: higher biodiversity, improved water quality, sediment capture, groundwater recharge, and, importantly, a reduction in flood damage due to the restored storage and slow release of floodwaters.

The other options don’t fit because restoration isn’t inherently irrelevant to flood risk, nor does it automatically increase risk. And while restoration enhances natural processes, it does not typically replace engineered infrastructure entirely; in practice, it works alongside levees, channels, and barriers to reduce risk and improve resilience.

So, the best takeaway is that floodplain restoration can restore ecosystem services and reduce flood risk when designed with local knowledge.