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Abstract
The performance of an urban stormwater bioretention basin in South Downtown Atlanta, Georgia was examined in its first year of implementation. Bioretention is a stormwater best management practice (BMP) intended to manage stormwater runoff as close to the source as possible and is designed to behave similarly to natural and undeveloped areas. A total of 17 storms events across a bioretention basin draining a section of an interstate entrance ramp were evaluated in 2020 and 2021 for total suspended solids (TSS), ortho-phosphorus (Ortho-P), total nitrogen (TN), and total Kjeldahl nitrogen (TKN). Additionally, this study investigated the hydraulic behavior of the basin on matters pertaining to short-circuiting using a scale model. Results will be useful to make BMP designers and stakeholders aware of factors that are most critical to the performance of bioretention systems in response to interactive effects of urbanization.