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| ;I :Thornthwaite annual heat index (-) | | ;I :Thornthwaite annual heat index (-) |
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| ;L | | ;L :Length, e.g. of a reach, channel or swale (usually in m) |
| :Length, e.g. of a reach, channel or swale (usually in m) | |
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| ;m | | ;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) |
| :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) | |
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| ;n | | ;n :Manning's coefficient (unitless) Note: for clarity porosity is being expressed as 'void ratio' and sharing the notation V<sub>R</sub> |
| :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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| ;P | | ;N :Number of days in the month |
| :Perimeter of infiltration practice or swale x-section (m) | |
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| ;q | | ;P :Perimeter of infiltration practice or swale x-section (m) |
| :Infiltration rate in (length per time, usually mm/hr) | |
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| ;q' | | ;q :Infiltration rate in (length per time, usually mm/hr) |
| :Infiltration coefficient in (length per time, usually mm/hr) after application of safety correction factor (SCF) | |
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| ;Q<sub>p</sub> | | ;q':Infiltration coefficient in (length per time, usually mm/hr) after application of safety correction factor (SCF) |
| :Peak flow in units of volume per time (e.g. m<sup>3</sup>/s) | |
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| ;R | | ;Q<sub>p</sub> :Peak flow in units of volume per time (e.g. m<sup>3</sup>/s) |
| :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 :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. |
| :Existing rise of swale gradient (length, usually m)
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| ;R<sub>b</sub> | | ;R<sub>a</sub> :Existing rise of swale gradient (length, usually m) |
| :Rise of compensation gradient for an enhanced swale (length, usually m) | |
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| ;RVC<sub>T</sub> | | ;R<sub>b</sub> :Rise of compensation gradient for an enhanced swale (length, usually m) |
| :Runoff volume control target (as outlined by MOECC, units are mm) | |
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| ;S<sub>0</sub> | | ;RVC<sub>T</sub> :Runoff volume control target (as outlined by MOECC, units are mm) |
| :Longitudinal slope (m/m, i.e. dimensionless) | |
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| ;S<sub>x</sub> | | ;S<sub>0</sub> :Longitudinal slope (m/m, i.e. dimensionless) |
| :Cross slope (m/m, i.e. dimensionless) | |
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| ;SCF | | ;S<sub>x</sub> :Cross slope (m/m, i.e. dimensionless) |
| :Safety correction factor (dimensionless) | |
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| ;t | | ;SCF :Safety correction factor (dimensionless) |
| :time (usually in hrs) | |
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| ;T | | ;t :time (usually in hrs) |
| :Temperature (°C) | |
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| ;V | | ;T :Temperature (°C) |
| :Volume (usually in m<sup>3</sup>) | |
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| ;V<sub>R</sub> | | ;V :Volume (usually in m<sup>3</sup>) |
| :Void ratio, as usually applied to aggregates and yard materials. In this guide, it is also applied to native soils in lieu of porosity (unit for both are vol/vol, i.e. dimensionless)
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| ;y | | ;V<sub>R</sub> :Void ratio, as usually applied to aggregates and yard materials. In this guide, it is also applied to native soils in lieu of porosity (unit for both are vol/vol, i.e. dimensionless) |
| :Depth of water (length, usually m or sometimes mm) | | |
| | ;y :Depth of water (L, usually m or sometimes mm) |