Because the reduced motion of the water results in a lower capacity for the water to hold particles in the water table (still water clarifies itself) due to gravity.
You may well then ask how?, or 'motion with respect to what? They are very good question, for which science does not yet have very good answers.
It seems likely that relative motion between water molecules allows heavier particles to better resist gravitational attraction by somehow increasing 'relative' buoyancy. i.e. the water may somehow be more dense when turbulent. (That is as much speculation as postulation).
One More River - 2010 SUSPENDED was released on: USA: 2010
suspended
A river's suspended load and bed load may accumulate at the river's mouth and form a delta. It is a land form created by the deposition of sediments.
so they could farm and settle there.
A River Between - 2013 SUSPENDED was released on: USA: 24 June 2013 (Los Angeles, California)
they settle in river valleys to grow crops and build cities
The Yangtze river is known as the Yellow river due to the high volumes of sediment that are suspended in it.
The Yangtze river is known as the Yellow river due to the high volumes of sediment that are suspended in it.
suspended sediment
why did the lenape settle in the new jersey area
the river
because you have water