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Image taken from a UAS showing the non-toxic red dye used in the Missouri River dye-trace assessment

By Geosciences and Environmental Change Science Center May 2021 (approx.)
Image taken from a UAS showing the non-toxic red dye used in the Missouri River dye-trace assessment
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Image taken from a UAS showing the non-toxic red dye used in the Missouri River dye-trace assessment 

The NUSO, Columbia Environmental Research Center, U.S. Army Corps of Engineers, and Missouri University of Science and Technology researchers conducted a Missouri River dye-trace assessment in May 2021 to support natural hazards research of high river flow events and associated effects on endangered species. 

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Public Domain.