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Scientific Investigations Report 2007–5178

Scientific Investigations Report 2007–5178

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Multiple high-turbidity events with values greater than 250 Formazin Nephelometric Units occurred in streams of the North Santiam River basin during water years 1999–2004. By using a combination of field reconnaissance, aerial photography, and geographic information systems, eight of these high-turbidity events were investigated and linked to at least one likely source area and became known as “major turbidity events.” Sediment source type and location, the amount of material transported, and the results of any follow-up investigation of the source area were recorded for each event.

Significant findings from this study include:

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