What causes colour and turbidity in a watershed?

Date:2023-01-19
Colour and turbidity in a watershed can be caused by several factors. The most common are soil erosion, urban runoff, land clearing, agricultural and forestry activities, and atmospheric deposition. Soil erosion releases suspended matter or particulates in the water, causing it to become cloudy and turbid. The particulates can also add colour to the water from their coloration. Urban runoff from sources such as automotive and industrial emissions contains a wide variety of substances including oils, sediment and toxins which can contribute to the turbidity and coloration of the water. Land clearing and other activities such as plowing, deforestation and logging can also introduce large amounts of sediment into the water, which when combined with the runoff can significantly increase the turbidity and colour of the water. Finally, atmospheric deposition such as dust and particles from snow or rain also contribute to the coloration and turbidity of the water.
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