Changes

==External Performance Resources==

==External Performance Resources==

*[[https://www3.epa.gov/region1/npdes/stormwater/research/epa-final-report-filter-study.pdf USEPA, 2013 - Evaluation and Optimization of Bioretention Design for Nitrogen and Phosphorus Removal]]

*[https://www3.epa.gov/region1/npdes/stormwater/research/epa-final-report-filter-study.pdf USEPA, 2013 - Evaluation and Optimization of Bioretention Design for Nitrogen and Phosphorus Removal]

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**USEPA conducted both field and laboratory testing on the perfomance of bioretention with augmented designs and filter media ocmposition with aluminum hydroxide/oxide cotentt, found normally within water treatment residuals. Tehse additivs added at 10-15% of the total filter media mix ad median removal efficiencies of 90-99% of orthophosphate and a second study found a bioretentio ndesign with WTR micture in the filter medioa and a [[IWSZ|Bioretention: Internal water storage]] optimized to remove phosphorus and nitrogen had a removal efficienbcy of 20% and effluent concentrations below 20ug/L (well below the MECP/CCME guideline i nOntario).

==References==

==References==