*''K<sub>m</sub>'' is the hydraulic conductivity of the filter media (mm/hr),
*''K<sub>m</sub>'' is the hydraulic conductivity of the filter media (mm/hr),
*''A<sub>p</sub>'' is the area of the practice (m<sup>2</sup>),
*''A<sub>p</sub>'' is the area of the practice (m<sup>2</sup>),
−
*''Σ h'' is the total depth of bioretention components over the perforated pipe (m) (e.g. ponding/[[mulch]]/[[filter media]]/[[choker layer]]), and
+
*''Σ h'' is the total head of water within bioretention components over the perforated pipe (m) (i.e. ponding + [[mulch]] + [[filter media]] + [[choker layer]]), and
*''d<sub>m</sub>'' is the depth of the filter media (m).
*''d<sub>m</sub>'' is the depth of the filter media (m).