Runoff
On flood planes the water erodes away the banks of the river. The Eroded dirt and sediment fall into the river.
Most sediment washes or falls into a river as a result of mass movement and runoff. Other sediment erodes from the bottom or sides of the river. Wind can also drop sediment into the water. Hope I helped! -DorkyGeek77
sediment,bank and bed
Heavy sediment can form sandbars wherever the current is less than the main flow. River floods can remove the sandbar due to the stronger flow.
An anabranch is a diverging branch of a river, creek, or stream which re-enters the main stream.
The main reservoirs for the phosphorus cycle are rocks, soil, and sediment. Phosphorus is released from these reservoirs through weathering processes and enters the cycle through runoff into water bodies where it is utilized by organisms before returning to the soil or sediment.
The main parts of a river system include the source (where the river begins), the course (the path the river takes), the mouth (where the river empties into a larger body of water), tributaries (smaller rivers or streams that flow into the main river), and the watershed (the area of land that drains into the river).
Deposition
River erosion is caused by the flow of water carrying sediment that erodes the riverbanks and bed. Tributaries erode the land they flow through as well, contributing sediment to the main river. Valleys are carved by river erosion over time, shaping the landscape.
I am puzzled by your question in the use of the word you. The main river of Bangladesh is the Brahmaputra, which becomes the Jamuna River as soon as it enters Bangladesh. It then becomes the Padma River when the Ganges joins it some 72kms west of Dhaka. It then becomes the Padma-Meghna river when they join at Chandpur.
Rivers, streams or such like that flow into another larger river