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|''P''||m<sup>2</sup>||Permeable area i.e. area of the facility or BMP
|''P''||m<sup>2</sup>||Permeable area i.e. area of the facility or BMP
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The following equations assume that infiltration occurs primarily through the base of the facility.
They may be applied in all cases, but for some geometries (e.g. where a particularly deep facility is possible and desired) it may be preferred to also account for lateral infiltration.
To calculate the required depth, where the area of the facility is constrained:
To calculate the required depth, where the area of the facility is constrained: