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Turbidity
Cloudiness in the water column, caused by the presence of suspended and dissolved matter such as clay, silt, organic matter, or plankton.
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National field manual for the collection of water-quality data
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Field manual (also available in PDF and paper formats) with instructions on techniques to collect and process water samples and to perform measurements of temperature, oxygen content, conductance, pH, turbidity, and fecal contaminants.
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