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Laboratory experiment data—turbidity response to increasing silt and clay concentration

Data for Technical Note: False low turbidity readings during high suspended-sediment concentrations


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Voichick, N., 2018, Laboratory experiment data—turbidity response to increasing silt and clay concentration: U.S. Geological Survey data release,


These data were compiled during a laboratory experiment showing the turbidity response to increasing silt and clay concentration. The sediment used for the laboratory experiment was collected in the Grand Canyon study area, from the bank of the Little Colorado River, approximately 1 kilometer upstream from its confluence with the Colorado River. The sediment was passed through a 63 µm sieve to isolate the silt-and-clay-size fraction. The silt and clay was completely dried in an oven (at 105 degrees Celsius for 12 hours), weighed, mechanically disaggregated, and added in stages to a measured volume of water to calculate concentration. The sediment was kept in suspension with an electric stirrer and turbidity was recorded after readings [...]


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USGS_2018_NVoichick_Laboratory_Experiment_Data.xml 102.39 KB


The purpose of collecting these data was to determine whether the turbidity response to very high suspended-sediment concentrations seen in the study area could be duplicated in the laboratory. It was expected and demonstrated in the laboratory that at very high suspended-sediment concentrations, as suspended-sediment concentration increased, turbidity values changed from a “pegged” or a constant value above the working range of the turbidity probe to lower values within the working range of the turbidity probe.


The author of these data request that data users contact them regarding intended use and to assist with understanding limitations and interpretation. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.

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DOI doi:10.5066/F72N516S

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