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mLine 81:
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→=Drainage time (3D)
==Additional calculations==
==Additional calculations==
===Drainage time (3D)==
===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)]]