Data from the Colorado River in Grand Canyon, Arizona and a laboratory experiment both demonstrate that when turbidity exceeds instrument-pegged conditions, increasing suspended-sediment concentration (and thus increasing turbidity) may cause 20 optical probes to record decreasing “false” turbidity values that appear to be within the valid measurement range of the probe. Therefore, under high turbidity conditions, other surrogate measurements of turbidity (e.g. acoustic-attenuation measurements or suspended-sediment samples) are necessary to correct these low false turbidity measurements and accurately measure turbidity.

https://www.hydrol-earth-syst-sci-discuss.net/hess-2017-528/hess-2017-528.pdf

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