2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/05/2017 | 12:15 PM - 12:30 PM | SEDIMENT AND PHOSPHORUS LOADING TO AN URBAN RIVER IN SOUTHEAST IDAHO BEFORE AND AFTER STORMWATER PERMIT IMPLEMENTATION | 302A
SEDIMENT AND PHOSPHORUS LOADING TO AN URBAN RIVER IN SOUTHEAST IDAHO BEFORE AND AFTER STORMWATER PERMIT IMPLEMENTATION
In 2008, the City of Pocatello in southeast Idaho, USA installed a detention basin to intercept a stormwater outfall that discharged directly to the Portneuf River. The Idaho Department of Environmental Quality continuously monitors turbidity with sondes at two locations in the river, upstream and downstream of the Pocatello Urbanized Area (PUA). We estimated sediment and phosphorus loads on a daily basis from 2003 to 2015 using turbidity and flow data. Sediment and phosphorus contributions from the PUA were calculated as the difference between the downstream and the upstream loads. Overall, the river at the downstream site exported 53,524 kg/day of sediment and 80 kg/day of phosphorus. The PUA accounted for 5% of the sediment and phosphorus load at the downstream site. PUA contributions of sediment and phosphorus were greatest winter-spring. In high flow years, the PUA contributed larger loads of sediment and phosphorus to the river. Following installation of the detention basin and increased stormwater management efforts, we were unable to detect changes in sediment loading from the PUA given our measurement scale and large inter annual variability.
- S04 Natural and Constructed Wetlands – improving water quality and watershed health
- S23 Rehabilitating urban streams: perspectives from science and management
- S02 Urban streams, aquatic ecology, and stormwater engineering: How do we encourage integration, opportunities and collaboration in an era of green infrastructure innovation?
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Presenters/Authors
Hannah Harris
(), Idaho Department of Environmental Quality, hannah.harris@deq.idaho.gov;
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Greg Mladenka
(), Idaho Department of Environmental Quality, greg.mladenka@deq.idaho.gov;
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Lynn Van Every
(), Idaho Department of Environmental Quality, lynn.vanevery@deq.idaho.gov;
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