Total suspended solids and turbidity are distinct measurements that provide similar assessment of the water quality. TSS is a measure of the mass of solids found in a volume of water that can be filtered by a 1.5 um glass fiber filter. Turbidity is a measure of the optical diffraction imparted by solids the water. Both can be used to assess the impact of solids on a water body.[vii]
The largest amounts of solids are generated from construction activities, agriculture, unpaved surfaces, and waste management. However, solids develop from less evident sources such as highways, parking lots, and air emissions.[viii] Wind and rain act as the predominant mechanism transporting solids into waterways.