2,681
edits
Changes
Jump to navigation
Jump to search
Line 104:
Line 104: + − + − *The principles of bioretention can be applied in any scenario where planting or vegetation would normally be found.
→Available Space
===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.
===Site Topography===
===Site Topography===