Nitrogen removal rates are linked to increased depth of IWS, so that a minimum of 45 cm of IWS is recommended where the depth of the native soils and bioretention cell permit<ref>Lynn TJ, Yeh DH, Ergas SJ. Performance of Denitrifying Stormwater Biofilters Under Intermittent Conditions. Environ Eng Sci. 2015;32(9):150710132840004. doi:10.1089/ees.2015.0135.</ref>. | Nitrogen removal rates are linked to increased depth of IWS, so that a minimum of 45 cm of IWS is recommended where the depth of the native soils and bioretention cell permit<ref>Lynn TJ, Yeh DH, Ergas SJ. Performance of Denitrifying Stormwater Biofilters Under Intermittent Conditions. Environ Eng Sci. 2015;32(9):150710132840004. doi:10.1089/ees.2015.0135.</ref>. |