2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/06/2017 | 10:15 AM - 10:30 AM | Regenerative Stormwater Conveyance (RSC) as a restoration approach to nutrient management may depend upon carbon quantity, quality, and source | 306A

Regenerative Stormwater Conveyance (RSC) as a restoration approach to nutrient management may depend upon carbon quantity, quality, and source

Regenerative Stormwater Conveyance (RSC) is a restoration approach based on engineering stream channels to incorporate shallow pools, riffles, and grade controls to increase storm water retention and control erosion, and adding a carbon layer to the stream bed (e.g. wood chips) to enhance microbial processes like denitrification. This study examines RSCs effects on nutrients (P and N) and trace metals at two RSC sites 5 and 7 years post-construction, using combined field and lab measurements. Field measurements showed that RSCs usually had lower DO and pH relative to nearby untreated stream reaches, but did not have consistently different P, N, dissolved organic carbon or trace metals (Fe and Mn). No consistent longitudinal change in any water quality parameter was observed across sites. In lab simulation experiments, we observed consistent removal of N and P when sediment was amended with wood chips and leaf litter suggesting that organic matter additions to stream substrates are important drivers of nutrient transformation in RSCs. Nutrient management effectiveness in RSCs depends upon quantity and quality of organic matter added to the stream bed but also as supplied from the adjacent riparian zone.

C16 Restoration Ecology
C08 Urban Ecology
C10 Biogeochemistry

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Presenters/Authors

Shuiwang Duan (), United States Environmental Protection Agency, sduan@umd.edu;