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;N :Number of days in the month
;N :Number of days in the month
;P :Perimeter of infiltration practice or swale x-section (m)
;x :Perimeter of infiltration practice or swale x-section (m)
;q :Infiltration rate in (length per time, usually mm/hr)
;f':Design infiltration rate (length per time, usually mm/hr) after application of safety correction factor (SCF)
;Q<sub>p</sub> :Peak flow in units of volume per time (e.g. m<sup>3</sup>/s)
;Q<sub>p</sub> :Peak flow in units of volume per time (e.g. m<sup>3</sup>/s)
;R<sub>b</sub> :Rise of compensation gradient for an enhanced swale (length, usually m)
;R<sub>b</sub> :Rise of compensation gradient for an enhanced swale (length, usually m)
;RVC<sub>T</sub> :Runoff volume control target (as outlined by MOECC, units are mm)
;RVC<sub>T</sub> :Runoff volume control target (as outlined by MECP, units are mm)
;S<sub>0</sub> :Longitudinal slope (m/m, i.e. dimensionless)
;S<sub>0</sub> :Longitudinal slope (m/m, i.e. dimensionless)
;V :Volume (usually in m<sup>3</sup>)
;V :Volume (usually in m<sup>3</sup>)
;V<sub>R</sub> :Void ratio, as usually applied to aggregates and yard materials. In this guide, it is also applied to native soils in lieu of porosity (unit for both are vol/vol, i.e. dimensionless)
;n :Porosity, applies to aggregate and other void-forming materials, filter media and native soils (unit is vol/vol, so dimensionless)
;y :Depth of water (L, usually m or sometimes mm)
;y :Depth of water (L, usually m or sometimes mm)