| Line 15: | Line 15: | 
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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> | 
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|  | ;q |  | ;q | 
| Line 24: | Line 24: | 
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|  | ;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.    | 
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|  | ;R<sub>a</sub>   |  | ;R<sub>a</sub>   |