The lower Yellow River is a river that tends to build up sediment but also has a way of balancing itself out. Most of the sediment that comes in gets carried away by the river, especially during floods. To prevent too much sediment from building up in the river, it's important to release sediment during floods. The amount of sediment carried away by the river depends on how much water is flowing and how much sediment is in the water. The river can adjust itself to keep a steady flow of sediment.