The bigger question is what of the heavy metals etc are soluble in water.
Water is the ultimate solvent.
Almost everything in nature is water soluble given time. Look at stalagmites.
What doesn’t dissolve, can be eroded by what’s suspended in the flowing water.
Little difference between something dissolved or particles so small they stay in suspension with little agitatiion.
The Conowingo dam on the Susquehanna is so silted in as to almost not exist. They considered dredging, then realized it is best to not stir up what has washed in from half of Pa, and some of NY rivers for over half a century.
