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| ;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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− | ;d :Depth e.g. of an infiltration practice (units of length, usually mm or m) | + | ;D :Duration of the design storm event (in units of time, usually hrs) |
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− | ;f :Infiltration rate (usually mm/hr) | + | ;d<sub>T</sub> :Total depth of an infiltration practice (unit of length, usually cm or m) |
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| + | ;f :Infiltration rate, measured (usually mm/hr) |
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| + | ;f':Design infiltration rate (length per time, usually mm/hr) after application of safety correction factor (SCF) |
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| ;h :height (units of length) | | ;h :height (units of length) |
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| + | ;i :Intensity of the design storm event (in units of depth/time, usually mm/hr) |
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| ;i :Thornthwaite monthly heat index (-) | | ;i :Thornthwaite monthly heat index (-) |
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| ;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) | | ;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) |
| + | |
| + | ;n :Porosity, applies to aggregate and other void-forming materials, filter media and native soils (unit is vol/vol, so dimensionless) |
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| ;n :Manning's coefficient (unitless) Note: the symbol n is also used for porosity so it is important to be sure which term is implied. | | ;n :Manning's coefficient (unitless) Note: the symbol n is also used for porosity so it is important to be sure which term is implied. |
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| ;N :Number of days in the month | | ;N :Number of days in the month |
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− | ;x :Perimeter of infiltration practice or swale x-section (m)
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− |
| |
− | ;f':Design infiltration rate (length per time, usually mm/hr) after application of safety correction factor (SCF)
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| ;Q<sub>p</sub> :Peak flow in units of volume per time (e.g. m<sup>3</sup>/s) | | ;Q<sub>p</sub> :Peak flow in units of volume per time (e.g. m<sup>3</sup>/s) |
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| ;V :Volume (usually in m<sup>3</sup>) | | ;V :Volume (usually in m<sup>3</sup>) |
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− | ;n :Porosity, applies to aggregate and other void-forming materials, filter media and native soils (unit is vol/vol, so dimensionless) | + | ;x :Perimeter of infiltration practice or swale x-section (m) |
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| ;y :Depth of water (L, usually m or sometimes mm) | | ;y :Depth of water (L, usually m or sometimes mm) |