Stormwater Symposium

Poster

397504 - Thermal Mitigation by Select Stormwater Control Measures in Trout Sensitive Waters of Western North Carolina

Wednesday, June 6
2:00 PM - 3:30 PM
Location: Greenway AB
Co-Authors: Jeffrey Johnson, Raleigh, North Carolina – North Carolina State University; William Hunt, Raleigh, North Carolina – North Carolina State University

Land use changes and urbanization negatively impact aquatic environments. Urbanized watersheds produce downstream flooding, while exporting pollutants, including sediment, oils and grease, heavy metals, nutrients, and pathogens. Thermal enrichment is a lesser studied stormwater pollutant but still has significant impacts on cold water streams. Runoff heated by impervious surfaces produce in-stream thermal spikes greater than the 21oC threshold for Brook Trout. Stormwater Control Measures (SCMs) mitigate many of the hydrologic and water quality impacts of increased imperviousness; however, their performance at thermal mitigation is less understood. A study in Hendersonville, North Carolina, was conducted to assess the performance of a rainwater harvesting system, a level spreader vegetative filter strip, and a bioretention cell for temperature and thermal load reduction. All systems received thermally enriched runoff from roof top and paved areas. These data will be contrasted to those of previous studies conducted in Western North Carolina to devise design and selection guidance for SCMs in trout sensitive waters.

Simon Benjamin. Gregg, EI, LEED Green Associate

Graduate researcher
North Carolina State University

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397504 - Thermal Mitigation by Select Stormwater Control Measures in Trout Sensitive Waters of Western North Carolina



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