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[[file:Hydraulic radius.png|thumb|Two footprint areas of 9 m<sup>2</sup>.<br>
[[file:Hydraulic radius.png|thumb|Two footprint areas of 9 m<sup>2</sup>.<br>
P = 12 m (left), P = 20 m (right)]]
P = 12 m (left), P = 20 m (right)]]
<poem>
Fit the bioretention facility into the site plan. It is necessary to have an idea of the perimeter of the facility.
Fit the bioretention facility into the site plan. It is necessary to have an idea of the perimeter of the facility.
Narrow, linear cells drain faster than round or blocky footprint geometries.
Narrow, linear cells drain faster than round or blocky footprint geometries.
Divide the footprint area (''A<sub>p</sub>'') by the perimeter (''P'').
</poem>
==Step 3==
==Step 3==