1. During low flow, the load that is being carried by the river is dropped onto the river bed which raises the height of the bed.
  2. During times of flood, water flows out more easily over the top of the river channel and onto the surrounding area. As this happens, it looses energy and deposits it’s load.
  3. The heavy coarse material is deposited on the river banks. The finer silt is deposited further away on the flood plain.
  4. After many floods, the river builds up a bank on either side.