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Rain gardens could save salmon from toxic tire chemicals

Date:
June 21, 2023
Source:
University of British Columbia
Summary:
Specially designed gardens could reduce the amount of a toxic chemical associated with tires entering our waterways by more than 90 per cent, new research shows.
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Specially designed gardens could reduce the amount of a toxic chemical associated with tires entering our waterways by more than 90 per cent, new research shows.

Tired toxins

The chemical 6PPD-quinone can form when car tires interact with the atmosphere. It enters rivers and streams when rain runs off roads into waterways. It is toxic to coho salmon, rainbow trout and some other fish.

"Rain gardens," or bioretention cells, are gardens engineered to reduce flooding and soak up contaminants when road runoff is directed onto them.

Rain gardens in Rain City

With the City of Vancouver, UBC researchers Drs. Timothy Rodgers (he/him) and Rachel Scholes (she/her) tested a Vancouver rain garden at 8th and Pine, pumping 14,000 litres of water spiked with 6PPD-quinone onto the garden for four hours and testing the water draining from beneath the garden at frequent intervals. They found only about two to five per cent of the chemical made it through, with about 75 per cent captured by the soil and plants.

Extrapolating their results using a computer model, the team predicted the garden would prevent more than 90 per cent of the chemical from directly entering salmon-bearing streams in an average year.

Save Our Salmon

Vancouver's Rain City Strategy will build more "green infrastructure" including rain gardens, and municipalities could use the research to plan where and how to place these, the researchers say. This could include targeting areas with large highways that runoff into salmon-bearing streams and such systems could help meet multiple municipal environmental goals simultaneously. "Anywhere where you know there's salmon, you should be trying to direct that runoff as much as possible into systems like this," says Dr. Rodgers.


Story Source:

Materials provided by University of British Columbia. Note: Content may be edited for style and length.


Journal Reference:

  1. Timothy F. M. Rodgers, Yanru Wang, Cassandra Humes, Matthew Jeronimo, Cassandra Johannessen, Sylvie Spraakman, Amanda Giang, Rachel C. Scholes. Bioretention Cells Provide a 10-Fold Reduction in 6PPD-Quinone Mass Loadings to Receiving Waters: Evidence from a Field Experiment and Modeling. Environmental Science & Technology Letters, 2023; DOI: 10.1021/acs.estlett.3c00203

Cite This Page:

University of British Columbia. "Rain gardens could save salmon from toxic tire chemicals." ScienceDaily. ScienceDaily, 21 June 2023. <www.sciencedaily.com/releases/2023/06/230621164742.htm>.
University of British Columbia. (2023, June 21). Rain gardens could save salmon from toxic tire chemicals. ScienceDaily. Retrieved March 4, 2024 from www.sciencedaily.com/releases/2023/06/230621164742.htm
University of British Columbia. "Rain gardens could save salmon from toxic tire chemicals." ScienceDaily. www.sciencedaily.com/releases/2023/06/230621164742.htm (accessed March 4, 2024).

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