Changes

:<math>t=\frac{nA_{p}}{f'P}ln\left [ \frac{\left (d_{T}+ \frac{A_{p}}{P} \right )}{\left(\frac{A_{p}}{P}\right)}\right]</math>

:<math>t=\frac{nA_{p}}{f'P}ln\left [ \frac{\left (d_{T}+ \frac{A_{p}}{P} \right )}{\left(\frac{A_{p}}{P}\right)}\right]</math>

{{Plainlist|1=Where:

{{Plainlist|1=Where:

*''n'' is the porosity of the media,  

*''n'' is the porosity of the fill materials within the practice, depth weighted mean

*''A_p'' is the area of the practice (m²),

*''A_p'' is the area of the practice (m²),

*''f''' is the design infiltration rate (mm/hr),  

*''f''' is the design infiltration rate (mm/hr),