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For some geometries (e.g. where a particularly deep facility is both possible and desired), it may be preferred to also account for lateral infiltration.
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The following equations assume that infiltration occurs primarily through the base of the facility.
The following equations assume that infiltration occurs primarily through the base of the facility.
They may be applied for most shapes and sizes of infiltration facility.
They may be applied for any shape and size of infiltration facility.
To calculate the required depth, where the area of the facility is constrained:
To calculate the required depth, where the area of the facility is constrained:
[[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 = 14 m, and x = 16 m]]
From left to right x = 12 m, x = 14 m, and x = 16 m]]
For some geometries (e.g. particularly deep facilities or linear facilities), it may be preferred to also account for lateral infiltration.
The 3 dimensional equations make use of the hydraulic radius (''P''/''x''), where ''x'' is the perimeter (m) of the facility. <br>
The 3 dimensional equations make use of the hydraulic radius (''P''/''x''), where ''x'' is the perimeter (m) of the facility. <br>
Maximizing the perimeter of the facility directs designers towards longer, linear footprint shapes such as [[infiltration trenches]] and [[bioswales]].
Maximizing the perimeter of the facility directs designers towards longer, linear shapes such as [[infiltration trenches]] and [[bioswales]].
To calculate the required depth:
To calculate the required depth: