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→To calculate the required depth, where the area of the facility is constrained (3D drainage)
{{Clickable button|[[Media:Darcy_drainage.xlsx|Download the Darcy drainage time calculator]]}}<br>
{{Clickable button|[[Media:Darcy_drainage.xlsx|Download the Darcy drainage time calculator]]}}<br>
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[[file:Hydraulic radius.png|thumb|Three footprint areas of 9 m<sup>2</sup>.<br>
From left to right x = 12 m, x = 20 m]]<br>
For some geometries (e.g. particularly deep facilities or linear facilities), it preferable to account for lateral infiltration.
For some geometries (e.g. particularly deep facilities or linear facilities), it preferable to account for lateral infiltration.
The 3D equation make use of the hydraulic radius (''A<sub>p''/''x''), where ''x'' is the perimeter (m) of the facility. <br>
The 3D equation make use of the hydraulic radius (''A<sub>p''/''x''), where ''x'' is the perimeter (m) of the facility. <br>