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Notation

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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>
;Q<sub>p</sub>
:Peak flow in units of volume per time (e.g. m<sup>3</sup>/s)
 
;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.
;R<sub>a</sub>

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