When metals are immersed in flowing water, they are bound to move in the direction of flow of the water. Nonetheless, there are other factors, for example, metal mobility, fate and bioavailability, which determine partitioning between water and suspended solids. Metals are subjected to these factors too. Additionally, the metal form, in aqueous state, and its compounds, also determines how metals will behave in flowing water. These facts lay a background to detail how metals seep into sediments.