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GPS‑tracked bottles show rapid river transport; some devices unrecoverable, organizers say
California Water Quality Monitoring Council · October 24, 2025
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Summary
Wynn, a subcommittee co‑lead, described a field project deploying GPS‑equipped bottles to study how trash travels down rivers to ocean outlets.
Wynn, a subcommittee co‑lead, described a field project deploying GPS‑equipped bottles to study how trash travels down rivers to ocean outlets. "We put about 20 bottles in the San Gabriel River," Wynn said, and after the first rain event “almost all of them flushed directly to the river mouth.”
The project used real‑time GPS pings to map bottle…
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