Over the past several decades, the riverbeds in Picardy, especially in the Somme River, have been gradually rising due to the accumulation of sediments like sand, gravel, silt, and organic matter. This natural process, known as sedimentation, has thickened the riverbed, reducing the river’s ability to carry water efficiently. In the past, regular dredging—where material is removed from the riverbed—was used to maintain flow capacity. However, this practice has largely been abandoned in France due to concerns about increasing flood risks downstream and harm to aquatic ecosystems. The shift in policy from active riverbed maintenance to a more natural approach, known as river renaturation, has left the responsibility of managing sedimentation to riparian property owners—those who own land along the riverbanks. Unfortunately, these individuals rarely perform the necessary maintenance, leading to an unchecked rise in the riverbed. This has made the river more prone to flooding, especially during winter when heavy rains increase water levels and reduce the river's ability to handle the increased flow. As the riverbed rises, it leaves less room for water to spread out, making it harder for the river to manage seasonal changes in water levels. This has led to more frequent and severe winter flooding in the valleys of Picardy. Additionally, the shifting riverbed can cause the river to move from one bank to another, affecting the Somme Bay, a protected wetland area recognized for its rich birdlife and designated as a Ramsar site. In response to the growing problem, local communities and river management groups are now looking for balanced solutions. These include carefully planned maintenance efforts and restoring natural flood zones that allow rivers to expand safely during high water periods. However, the issue often remains unnoticed by the public until a flood occurs, reminding them of the underlying challenges in managing river systems sustainably.