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→Space
===Space===
===Space===
*For optimal performance bioretention facilities should receive runoff from impervious drainage areas between 5 to 20 times their own surface area.
*For optimal performance bioretention facilities should receive runoff from impervious drainage areas between 5 to 20 times their own permeable 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 against ease of maintenance.