Turbidity is the amount of solid particles that are suspended in water that cause light rays shining through the water to scatter. Turbidity makes the water cloudy, or even opaque, in extreme cases.
USGS.gov

Turbidity is the amount of solid particles that are suspended in water that cause light rays shining through the water to scatter. Turbidity makes the water cloudy, or even opaque, in extreme cases.
USGS.gov