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Thank you to everyone who attended the 11th Annual Salt Lake County Watershed Symposium! This free two-day conference encourages a comprehensive review of the current state of our watershed while creating learning opportunities for a diverse array of stakeholders. Sessions covered a broad range of topics on water quality and watershed issues with local, regional, and national relevance. Hosted by Salt Lake County Watershed Planning & Restoration.

Powerpoints and audio recordings are available.  Click on a session and scroll down to the attached files.
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Wednesday, November 15 • 10:40am - 11:10am
Urban Stormwater Impacts on the Jordan River: Who Could Have Guessed?

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Urban Stormwater Impacts on the Jordan River: Who Could Have Guessed?

Stormwater impacts have been shown to be significant and should be mitigated to increase DO and improve overall water quality in the Lower Jordan River.

Full Abstract:
In 2012 the Utah Department of Environmental Quality completed a total maximum daily load study on the Jordan River that concluded dissolved oxygen levels throughout the Lower Jordan are often below those necessary for the established beneficial use due to various sources of course particulate organic matter. A study by Richardson in 2014 evaluated the leaching of dissolved organic carbon (DOC) from coarse particulate matter entering storm drains during runoff events. His study found that the DOC generated from terrestrial grass and leaf debris in stormwater was readily biodegradable with a high long-term biochemical oxygen demand (BOD). To determine the extent that stormwater is responsible for the low DO in the Lower Jordan River, continuous data collected by an iUTAH aquatic monitoring station at the storm drain outlet at 1300 South were paired with lab results to quantify pollutant loads during both dry periods and storm events. Parameters available for continuous monitoring included fluorescent dissolved organic matter (fDOM) and specific conductivity, both of which dramatically spike during storm events. An Isco autosampler was installed at the site and programmed to begin sampling when certain thresholds of these parameters were met. These grab samples were brought back to the lab are analyzed for BOD, DOC, metals, phosphorous and nitrogen - all parameters that cannot be continuously measured with the installed probes. The goal was to then connect these values, particularly BOD and DOC, to the continuous parameters, particularly fDOM, available at the aquatic monitoring site, to determine correlations between continuous monitoring and lab generated data. These correlations were then used to estimate the fluctuations of BOD and DOC using continuous fDOM measurements in both the stormwater discharge and in the Lower Jordan River measured upstream from 1300 South. This presentation will highlight the fDOM/DOC/BOD relationships established for the 1300 South stormwater discharge and upstream in the Jordan River, will present the significant impact of the stormwater discharge to the Jordan during rainfall events, and will explore various green infrastructure approaches that could be implemented in the watershed to mitigate this impact over time.

avatar for R Ryan Dupont

R Ryan Dupont

Professor, Utah Water Research Laboratory, Utah State University
Dr. Dupont is a Professor of Civil and Environmental Engineering at Utah State University and has more than 35 years of experience teaching and conducting applied and basic research in environmental engineering at the Utah Water Research Laboratory at Utah State University. He received... Read More →

Wednesday November 15, 2017 10:40am - 11:10am MST
Lower Level: Ballroom B