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==Additional calculations==
==Additional calculations==
 
===Drainage time (3D)==
[[file:Hydraulic radius.png|thumb|Two practice areas of 9 m<sup>2</sup>.<br>
[[file:Hydraulic radius.png|thumb|Two practice 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>
<poem>
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 area of the practice (''A<sub>p</sub>'') by the perimeter (''P'').
Divide the area of the practice (''A<sub>p</sub>'') by the perimeter (''P'').

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