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;A<sub>c</sub>
:Area of the catchment, whole contributing drainage area (usually in m<sup>2</sup>)
;A<sub>p</sub>
:Area of the practice e.g. footprint area of a bioretention cell (usually in m<sup>2</sup>)
;d
;d
;m
;m
:run of side slopes in channel cross sections (length, but usually expressed as a ratio in relation to rise. e.g. where side side slopes = 1:3.5, m = 3.5)
:run of side slopes in channel cross sections (length, but usually expressed as a ratio in relation to rise. e.g. where side side slopes = 1:3.5, m = 3.5)
;n
:Manning's coefficient (unitless) (Note: for clarity porosity is being expressed as 'void ratio' and sharing the notation '
;q
;q
;RVC<sub>T</sub>
;RVC<sub>T</sub>
:Runoff volume control target (as outlined in MOECC recommendations, mm)
:Runoff volume control target (as outlined by MOECC, units are mm)
;S
;S
;SCF
;SCF
:Safety correction factor (dimensionless)
:Safety correction factor (dimensionless)
;V<sub>R</sub>
:Void ratio, as usually applied to aggregates and yard materials. In this guide, is also applied to native soils in lieu of porosity (similarly dimensionless)
;y
;y
:Depth of water (length, usually m or sometimes mm)
:Depth of water (length, usually m or sometimes mm)