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→Drainage time to empty facility
[[file:Hydraulic radius.png|thumb|Three footprint areas of 9 m<sup>2</sup>.<br>
[[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]]
From left to right x = 12 m, x = 20 m]]
The target [[drainage time]] for the internal storage of an infiltration facility is typically between 48 and 72 hours. <br>
The target [[drainage time]] for the internal storage of an infiltration facility is typically between 48 and 72 hours or based on the average inter-event period for the location. See [[Drainage time]] for more information about how inter-event periods vary across Ontario and to help select what is suitable for the site <br>
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Try the Darcy Drainage calculator tool for estimating drainage time assuming either one or three-dimensional drainage from the practice <br>
{{Clickable button|[[Media:Darcy drainage.xlsx|Download drainage time calculator(.xlsx)]]}}
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>