What is the purpose of floodplain reconstruction along overincised streams?

Floodplain reconstruction along overincised streams primarily aims to restore natural flow patterns. When streams become overincised—meaning they have eroded deeper than their natural state—it disrupts the hydrology and ecology of the area. This excessive erosion can lead to increased sedimentation downstream, altered flow regimes, and degraded habitats for aquatic and terrestrial life.

By reconstructing floodplains, the hydrologic dynamics of the stream system can be reestablished, allowing water to spread out and slow down during high flow events. This not only mitigates erosion but also helps to rejuvenate the surrounding ecosystem. The restored flow patterns can reconnect the stream with its floodplain, allowing for improved water retention, natural sediment deposition, and enhanced ecological functions. So, the reconstruction is fundamentally about bringing the stream back to a more naturally functioning state, which includes restoring those essential flow patterns.