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| ==Slope gradient== | | ==Expressing slope== |
| Slope gradients are expressed as Y:X where Y is a single unit of rise and X is the corresponding run. It can be calculated by dividing the rise by the run: | | {{float right|[[File:Theta.jpg|border|500 px]]}} |
| | ===Slope gradient=== |
| | Slope gradients are are common form of expression for steeply sloped areas like the sides of [[swales]]. Expressed as Y:X where Y is a single unit of rise and X is the corresponding run. It can be calculated by dividing the rise by the run: |
| e.g.:<math>\frac{rise}{run}=\frac{4\ m}{12\ m}=\frac{1}{3};we\ say\ the\ slope\ =1:3\ or\ 1\ in\ 3</math> | | e.g.:<math>\frac{rise}{run}=\frac{4\ m}{12\ m}=\frac{1}{3};we\ say\ the\ slope\ =1:3\ or\ 1\ in\ 3</math> |
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| ==Slope percentage== | | ===Slope percentage=== |
| Slope percentage is calculated similarly by dividing rise by run, but then multiplying by 100 to get a percentage: | | Slope percentage is calculated similarly by dividing rise by run, but then multiplying by 100 to get a percentage: |
| e.g.:<math>slope=\left (\frac{rise}{run}\right )\times 100=\left(\frac{4\ m}{12\ m}\right)\times 100= 33\%</math> | | e.g.:<math>slope=\left (\frac{rise}{run}\right )\times 100=\left(\frac{4\ m}{12\ m}\right)\times 100= 33\%</math> |
| | '''But''' for many calculations the ''rise/run'' isn't multiplied by 100, and instead is left as a decimal. e.g. 0.33 in the example above. |
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| ==Slope in degrees== | | ===Slope in degrees=== |
| Expressing a slope in degrees requires using the ''inverse tangent'' trigonometric function. | | Expressing a slope in degrees requires using the ''tangent'' trigonometric function. |
| e.g.:<math>\tan \theta =\left ( \frac{4\ m}{12\ m} \right ); \theta =\tan^{-1}\left ( 0.33 \right )=18.3^{\circ}</math> | | e.g.:<math>\tan \theta =\left ( \frac{4\ m}{12\ m} \right ); \theta =\tan^{-1}\left ( 0.33 \right )=18.3^{\circ}</math> |
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| <ref>Ontario. O. Reg. 191/11: INTEGRATED ACCESSIBILITY STANDARDS, 2011. https://www.ontario.ca/laws/regulation/r11191.</ref> | | '''[[Slope_table| Quick reference table]]''' |
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| | ==Normal range of slopes== |
| | The Accessibility for Ontarians with Disabilities Act<ref>Ontario. O. Reg. 191/11: INTEGRATED ACCESSIBILITY STANDARDS, 2011. https://www.ontario.ca/laws/regulation/r11191.</ref> provides a bare minimum to which public spaces must be designed. e.g. cross slope not to exceed 2 %. |
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| | Consider designing landscapes to universal design principals instead<ref>Universal Design.com. 2018. “The Leading Source for News and Information on Universal Design - The Leading Source for News and Information on Universal Design.” 2018. http://www.universaldesign.com/.</ref><ref>Institute for Human Centered Design. 2018. “Principles.” 2018. https://www.humancentereddesign.org/inclusive-design/principles.</ref>. |
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| {|class= "wikitable" "style=text-align: center;" | | {|class= "wikitable" "style=text-align: center;" |
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| |Planted banks||up to 100||up to 50 | | |Planted banks||up to 100||up to 50 |
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| | ==Freeboard== |
| | {{:Freeboard}} |
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| | ==Additional Resources== |
| | *[[File:Huang 2012.pdf]] |
| | *[[File:Matusik 2004.pdf]] |
| | *[[File:Tiner 2014.pdf]] |
| | *http://www.slopemeter.com/images/Slope_Conversion_Tables.xls - external resource |
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| | [[Category: Calculations]] |