A confluence - where a river joins another river. Mouth - Where a river meets the sea or an ocean. Attrition - This is when the bed load itself is eroded when sediment particles knock against the bed or each other and break, becoming more rounded and smaller. Solution or corrosion - This is when acidic water erodes rock. Flooding Floods can bring both advantages and disadvantages to an area.
Floods can deposite rich, fertile alluvium on agricultural areas.
Also, flood water can replenish irrigation channels. On the other hand floods can destroy food supplies, homes and transport infrastructures. Rain water reaches rivers faster. Flooding becomes more likely. Rain water reaches rivers faster and can cause flooding.