Changes

*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.  

*In the conceptual design stage it is recommended to set aside approximately 10 - 20 % of the contributing drainage area for bioretention facility placement.  

*In the conceptual design stage it is recommended to set aside approximately 10 - 20 % of the contributing drainage area for bioretention facility placement.  

*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 against 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-sided 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.