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*''d'' = Depth of infiltration practice in m.}}
 
*''d'' = Depth of infiltration practice in m.}}
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==Step 2==
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==Step 2, geometry and perimeter==
 
[[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)]]
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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'').
 
</poem>
 
</poem>
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==Step 3==
 
==Step 3==
 
[[File:Sizing bio2.png|thumb|The duration of surface ponding is usually determined by the emptying of the facility below.]]  
 
[[File:Sizing bio2.png|thumb|The duration of surface ponding is usually determined by the emptying of the facility below.]]  
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