2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2018 | 10:15 AM - 10:30 AM | NUTRIENT DYNAMICS IN SEMIARID CONSTRUCTED STORMWATER WETLANDS | 310 A
NUTRIENT DYNAMICS IN SEMIARID CONSTRUCTED STORMWATER WETLANDS
Constructed stormwater wetlands (CSWs) are built across diverse climates to address concerns with contaminants in urban stormwater, such as macronutrient loads. Despite this, research on the effectiveness of CSWs in macronutrient reduction has been limited to temperate climates. Our study addresses how differences in wetland vegetation and soils affect nutrient dynamics within two CSWs with varying water residence time and vegetation abundance, in a semiarid, snowmelt-driven system in Pocatello, ID. Storm-event water samples were analyzed to calculate fluxes of nitrogen, phosphorous, and organic carbon through each system. Analysis suggests that the size of the event may impact nutrient uptake, with larger storm events remobilizing sediments and leading to downstream nutrient transport. Soil and vegetation rewetting experiments were completed to identify the contributions of each to CSW nutrient dynamics. Evidence suggests that, in semiarid climates, both soils and senesced vegetation can become macronutrient sources during the initial rewetting period— when stormwater concentrations are already higher during the first flush. By understanding the function of stormwater infrastructure across diverse climatic conditions, we can recommend improvements to current projects and make better-informed decisions when building infrastructure in the future.
- Nutrients
- Restoration
- Water Quality
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Presenters/Authors
Carolyn Macek
(), Idaho State University, macecaro@isu.edu;
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Rebecca Hale
(), Idaho State University, halereb3@isu.edu;
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Colden Baxter
(), Idaho State University, baxtcold@isu.edu;
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Morey Burnham
(), Idaho State University, burnmore@isu.edu;
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