Siltation is most often caused by soil erosion or sediment spill. It is sometimes referred to by the ambiguous term "sediment pollution", which can also refer to a chemical contamination of sediments accumulated on the bottom, or to pollutants bound to sediment particles.

How does siltation occur?

Siltation occurs as a result of human activities that leads to fine soil leaching into nearby rivers. This results in an unnaturally large accumulation of silt that stays in that particular area of that river. ... Waterways and irrigation canals could also become affected in their functions by silt accumulations.

What causes silt in rivers?

Silt is created when rock is eroded, or worn away, by water and ice. ... Floods deposit silt along river banks and on flood plains. Deltas develop where rivers deposit silt as they empty into another body of water. About 60 percent of the Mississippi River Delta is made up of silt.