Water, Wastewater & Stormwater


392830 - Modeling Performance of Bioretention LID for Cold Climates in SWMM

Wednesday, June 6
4:00 PM - 5:30 PM
Location: Greenway EF
Co-Authors: Christine Pomeroy, Salt Lake City, Utah – University of Utah

With aging water infrastructure becoming a concern, sustainable solutions have become a focus. Green stormwater infrastructure such as bioretention, pervious pavement and green roofs are becoming more common solutions to this problem. Much of the research focus on these technologies focuses on warmer climates not affected by snow or ice. In this study, we employ a generalized simulation to address the deficiency by modeling the cold weather performance of bioretention cells in three cities: Salt Lake City, Boston, and Milwaukee. These cities were chosen as test cities from survey participants for the EPA CLASIC project. Models were setup using EPA SWMM to simulate performance of a bioretention cell attached to half-acre, 65% impervious lot. Each city had a model to only simulate precipitation as rain and a second model that treats precipitation as snowfall when certain parameters are met. Hydrologic simulations were run from 1/1/90 to 12/31/09. Precipitation and temperature data were obtained through NOAA from each city’s airport station. To determine variables for infiltration calculations, a soil map was generated for the downtown area of each city using the USDA Web Soil Survey. To determine snowmelt factors, long-term data from the nearest SNOTEL site to each city was used. Initial results show that bioretention cells can adequately reduce runoff during cold weather periods. Impairment occurred in the winter months due to soil freezing conditions, with each city acting differently due to soil temperature. Further evaluation will determine the suitability SWMM among runoff models for this type of analysis.

Benjamin Terry

Graduate Research Assistant
University of Utah


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392830 - Modeling Performance of Bioretention LID for Cold Climates in SWMM

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