The researchers studied sediment movement in a small agricultural area in California. They found that changes in the landscape and water flow caused the area to switch from depositing sediment to eroding it. This was due to changes in the river's shape and water levels. They also discovered that the river was carrying a lot of fine sediment, which was eroding the riverbanks. In wet years, the river carried a lot more sediment than in dry years. This study shows how small rivers can contribute sediment to larger rivers and bays, which is important for managing water quality and restoring natural habitats.