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Notation

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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>)
;d D :Depth e.g. Duration of an infiltration practice the design storm event (in units of lengthtime, usually mm or mhrs)
;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)
 
;i :Intensity of the design storm event (in units of depth/time, usually mm/hr)
;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)
 
;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 :Number of days in the month
 
;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)
;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>)
;n x :Porosity, applies to aggregate and other voidPerimeter of infiltration practice or swale x-forming materials, filter media and native soils section (unit is vol/vol, so dimensionlessm)
;y :Depth of water (L, usually m or sometimes mm)

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