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→Drainage Area
===Drainage Area===
===Drainage Area===
Typical contributing drainage areas are between 150 to 300 m<sup>2</sup> per tree, with a recommended maximum of 450 m<sup>2</sup> per tree.
Typical contributing drainage areas are between 150 to 300 m<sup>2</sup> per tree, with a recommended maximum of 450 m<sup>2</sup> per tree. For optimal performance recommended ratios of impervious drainage area to pervious facility footprint area (I:P area ratio) range from 5:1 on low permeability soils (HSG C and D) to 15:1 on high permeability soils (HSG A and B).
===Setback from Buildings===
===Setback from Buildings===