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*''i'' = Intensity of design storm in mm/hr
 
*''i'' = Intensity of design storm in mm/hr
 
*''f''' = [[design infiltration rate]] in mm/hr
 
*''f''' = [[design infiltration rate]] in mm/hr
*''n'' = Mean porosity of the fill within the practice
+
*''n'' = Weighted mean porosity of the fill materials within the practice
 
*''d<sub>T</sub>'' = Total depth of the infiltration practice in m.}}
 
*''d<sub>T</sub>'' = Total depth of the infiltration practice in m.}}
  

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