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;x :Perimeter of infiltration practice or swale x-section (m);f':Design infiltration rate (length per time, usually mm/hr) after application of safety correction factor (SCF)
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;A<sub>p</sub> :Area of the practice e.g. footprint area of a bioretention cell (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 :Depth e.g. of an infiltration practice (units of length, usually mm or m)
;D :Duration of the design storm event (in units of time, usually hrs)
;f :Infiltration rate (usually mm/hr)
;d<sub>T</sub> :Total depth of an infiltration practice (unit of length, usually cm or m)
;f :Infiltration rate, measured (usually mm/hr)
;f':Design infiltration rate (length per time, usually mm/hr) after application of safety correction factor (SCF)
;h :height (units of length)
;h :height (units of length)
;i :Intensity of the design storm event (in units of depth/time, usually mm/hr)
;i :Thornthwaite monthly heat index (-)
;i :Thornthwaite monthly heat index (-)
;m :run of side slopes in channel cross sections (length, but usually expressed as a ratio in relation to rise. e.g. side slopes = 1:3, so m = 3)
;m :run of side slopes in channel cross sections (length, but usually expressed as a ratio in relation to rise. e.g. side slopes = 1:3, so m = 3)
;n :Porosity, applies to aggregate and other void-forming materials, filter media and native soils (unit is vol/vol, so dimensionless)
;n :Manning's coefficient (unitless) Note: the symbol n is also used for porosity so it is important to be sure which term is implied.
;n :Manning's coefficient (unitless) Note: the symbol n is also used for porosity so it is important to be sure which term is implied.
;N :Number of days in the month
;N :Number of days in the month
;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)
;V :Volume (usually in m<sup>3</sup>)
;V :Volume (usually in m<sup>3</sup>)
;n :Porosity, applies to aggregate and other void-forming materials, filter media and native soils (unit is vol/vol, so dimensionless)
;x :Perimeter of infiltration practice or swale x-section (m)
;y :Depth of water (L, usually m or sometimes mm)
;y :Depth of water (L, usually m or sometimes mm)