Abstract Title

Session S-09B: Bioretention for Improving Water Quality

Proposed Abstract Title

The biological effectiveness of bioretention: Preventing toxicity to aquatic animals exposed to highway runoff

Keywords

Stormwater

Location

Room 608-609

Start Date

2-5-2014 10:30 AM

End Date

2-5-2014 12:00 PM

Description

Stormwater runoff contains a complex mixture of contaminants that can affect the resiliency of aquatic ecosystems. In the Pacific Northwest, urban stormwater runoff impacts both the development and adult survival of coho salmon (Oncorhynchus kisutch). Green stormwater infrastructure (GSI) approaches such as soil bioretention can greatly improve the quality of runoff from urban surfaces, however very little research has been conducted to assess whether these improvements are sufficient to prevent toxic harm to animals in receiving waters. We used a variety of animal models to determine the baseline toxicity of highway runoff to aquatic animals and to test the biological effectiveness of one treatment type. Highway runoff was collected during 6 storms between October 2011 and September 2012. Some events were acutely lethal to aquatic invertebrates (Ceriodaphnia dubia) and developing fish (Danio rerio). Sublethal effects included reproductive impairment in C. dubia and cardiovascular toxicity in D. rerio. Runoff from the final storm event was treated with soil bioretention (with and without plants). Untreated runoff was acutely lethal to juvenile O. kisutch, C. dubia, and Baetis spp (wild mayflies) and caused cardiovascular toxicity in D. rerio. Treatment prevented acute lethal and sublethal effects in all four species.

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May 2nd, 10:30 AM May 2nd, 12:00 PM

The biological effectiveness of bioretention: Preventing toxicity to aquatic animals exposed to highway runoff

Room 608-609

Stormwater runoff contains a complex mixture of contaminants that can affect the resiliency of aquatic ecosystems. In the Pacific Northwest, urban stormwater runoff impacts both the development and adult survival of coho salmon (Oncorhynchus kisutch). Green stormwater infrastructure (GSI) approaches such as soil bioretention can greatly improve the quality of runoff from urban surfaces, however very little research has been conducted to assess whether these improvements are sufficient to prevent toxic harm to animals in receiving waters. We used a variety of animal models to determine the baseline toxicity of highway runoff to aquatic animals and to test the biological effectiveness of one treatment type. Highway runoff was collected during 6 storms between October 2011 and September 2012. Some events were acutely lethal to aquatic invertebrates (Ceriodaphnia dubia) and developing fish (Danio rerio). Sublethal effects included reproductive impairment in C. dubia and cardiovascular toxicity in D. rerio. Runoff from the final storm event was treated with soil bioretention (with and without plants). Untreated runoff was acutely lethal to juvenile O. kisutch, C. dubia, and Baetis spp (wild mayflies) and caused cardiovascular toxicity in D. rerio. Treatment prevented acute lethal and sublethal effects in all four species.