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;A<sub>c</sub> :Area of the catchment, whole contributing drainage area (usually in m<sup>2</sup>).  
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;A<sub>c</sub> :Area of the catchment, whole contributing drainage area (usually in m<sup>2</sup>).
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;A<sub>i</sub> :Area of impervious cover within the catchment (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>)
 
;A<sub>p</sub> :Area of the practice e.g. footprint area of a bioretention cell (usually in m<sup>2</sup>)

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