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;n
;n
:Manning's coefficient (unitless) (Note: for clarity porosity is being expressed as 'void ratio' and sharing the notation '
:Manning's coefficient (unitless) (Note: for clarity porosity is being expressed as 'void ratio' and sharing the notation V<sub>R</sub>
;q
;q
;R
;R
:Ratio of catchment (A<sub>c</sub</p>) to the practice footprint area (A<sub>p</sub>). In [[green roofs]] (and often permeable paving systems) this will be 1:1. In [[bioretention]] it may be 15 or 20 to 1.
:Ratio of catchment (A<sub>c</sub>) to the practice footprint area (A<sub>p</sub>). ''syn.'' I/P ratio. For[[green roofs]] (and often permeable paving systems) this will be 1:1. In [[bioretention]] it may be 15 or 20 to 1.
;R<sub>a</sub>
;R<sub>a</sub>