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:<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 filter media,  
 
*''A<sub>p</sub>'' is the area of the practice (m<sup>2</sup>),
 
*''A<sub>p</sub>'' is the area of the practice (m<sup>2</sup>),
 
*''f''' is the design infiltration rate (mm/hr),  
 
*''f''' is the design infiltration rate (mm/hr),  

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