Changes

<math>t=\frac{nd}{K}</math>

<math>t=\frac{nd}{K}</math>

==Three dimensional infiltration==

==To calculate required depth (3D)==

[[file:Hydraulic radius.png|thumb|Three footprint areas of 9 m².<br>

[[file:Hydraulic radius.png|thumb|Three footprint areas of 9 m².<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]]

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 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:

:<math>d=a[e^{\left ( -bD \right )} -1]</math>

:<math>d=a[e^{\left ( -bD \right )} -1]</math>

<math>b=\frac{xq}{nP}</math>

<math>b=\frac{xq}{nP}</math>

The rearrangement to calculate the required footprint area of the facility for a given depth is not available at this time. Elegant submissions are invited.  

(The rearrangement to calculate the required footprint area of the facility for a given depth is not available at this time. Elegant submissions are invited.)

<h3>Drawdown time</h3>

==Drawdown time==

The design of infiltration facilities should be checked for [[drawdown time]]. The target drawdown time for the internal storage of an infiltration facility is between 48-72 hours. <br>

The design of infiltration facilities should be checked for [[drawdown time]]. The target drawdown time for the internal storage of an infiltration facility is between 48-72 hours. <br>

To calculate the time (''t'') to fully drain the facility:  

To calculate the time (''t'') to fully drain the facility: