2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2019 | 11:00 AM - 11:15 AM | DEVELOPING METHODS FOR ASSESSING WATER QUALITY IN STREAMS WHEN THERE’S NO WATER | 151 G
DEVELOPING METHODS FOR ASSESSING WATER QUALITY IN STREAMS WHEN THERE’S NO WATER
Non-perennial streams lack year-round flow, represent much of the U.S. stream length, and collectively affect downstream waters. Under the Clean Water Act, states, territories, and tribes must have water quality standards for their jurisdictional waters. Evaporative crystallization and biotic assimilation on benthic surfaces are retention mechanisms that may signal recent water quality for non-perennial streams that are often dry when water quality would otherwise be monitored. We conducted a stream mesocosm experiment to determine if, upon rewetting, dry substrates (unglazed tiles and gravel) will release nitrogen and phosphorus that reflect 2-month experimental dosing concentrations (nominal N/P ppb range: 240/40 to 3300/400). Substrates were dried for 69d before rewetting with deionized water. Water was collected from all 6 treatments at 2 and 48h after rewetting and after 72h for the lowest and highest concentrations. Rewetted-nutrient concentrations were generally linear with dose 2h after rewetting and remained so after 48h among the 3 lower doses for tiles and at least the 4 highest doses for gravel. Dose-response modeling is presented to characterize the resolution of the method. Our results indicate rewetting substrates from non-perennial streams has potential as a rapid monitoring method.
- Water Quality
- Nutrients
- Monitoring
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Presenters/Authors
Ken Fritz
(), US Environmental Protection Agency, Office of Research and Development, fritz.ken@epa.gov;
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Christopher Nietch
(), U.S. Environmental Protection Agency, nietch.christopher@epa.gov;
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Roger Burke
(), U. S. Environmental Protection Agency, burke.roger@epa.gov;
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