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| ===Available Space=== | | ===Available Space=== |
| + | *The principles of bioretention can be applied in any scenario where planting or vegetation would normally be found. |
| *In the conceptual design stage it is recommended to reserve approximately 10 to 20% of the contributing drainage area for the bioretention facility footprint. | | *In the conceptual design stage it is recommended to reserve approximately 10 to 20% of the contributing drainage area for the bioretention facility footprint. |
| *For optimal performance bioretention facilities should receive runoff from impervious drainage areas between 5 to 20 times their own permeable footprint surface area. | | *For optimal performance bioretention facilities should receive runoff from impervious drainage areas between 5 to 20 times their own permeable footprint surface area. |
| *Bioretention cells work best when distributed, so that no one facility receives runoff from more than 0.8 Ha, although there is a trade off to be considered regarding distributed collection and treatment versus ease of maintenance. | | *Bioretention cells work best when distributed, so that no one facility receives runoff from more than 0.8 Ha, although there is a trade off to be considered regarding distributed collection and treatment versus ease of maintenance. |
− | *Bioretention can be almost any shape, from having very curvilinear, soft edges with variable depth, to angular, hard-sided and uniform depth. | + | *Bioretention can be almost any shape, from having very curvilinear, soft edges with variable depth, to angular, hard-edged and uniform depth. |
| *For ease of construction and to ensure that the vegetation has adequate space, cells should be no narrower than 0.6 m at any point. | | *For ease of construction and to ensure that the vegetation has adequate space, cells should be no narrower than 0.6 m at any point. |
| *The maximum width of a facility is determined by the reach of the construction machinery, which must not be tracked into the cell. | | *The maximum width of a facility is determined by the reach of the construction machinery, which must not be tracked into the cell. |
− | *The principles of bioretention can be applied in any scenario where planting or vegetation would normally be found.
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| ===Site Topography=== | | ===Site Topography=== |