Changes

Try the Darcy Drainage calculator tool for estimating drainage time assuming either one or three-dimensional drainage from the practice <br>

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)]]}}<br>

{{Clickable button|[[Media:Darcy drainage.xlsx|Download drainage time calculator(.xlsx)]]}}<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>

'''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]].'''<br>

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

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

<math>t=\frac{nAp}{f'x}ln\left [ \frac{\left (d+ \frac{Ap}{x} \right )}{\left(\frac{Ap}{x}\right)}\right]</math>

<math>t=\frac{nAp}{f'x}ln\left [ \frac{\left (d+ \frac{Ap}{x} \right )}{\left(\frac{Ap}{x}\right)}\right]</math>