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→Determine the effective infiltration coefficient
*''A<sub>p</sub>'' = Area of the infiltration practice in m<sup>2</sup>
*''A<sub>p</sub>'' = Area of the infiltration practice in m<sup>2</sup>
*''A<sub>c</sub>'' = Catchment area in m<sup>2</sup>}}
*''A<sub>c</sub>'' = Catchment area in m<sup>2</sup>}}
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Apply an appropriate safety correction factor to the measured infiltration rate:
:<math>q'=\frac{q}{SCF}</math>
:<math>q'=\frac{q}{SCF}</math>
{{Plainlist|1=Where:
*''q''' = Infiltration coefficient in mm/hr (accounting for SCF)
*''SCF'' = Safety correction factor}}
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*''i'' = Intensity of design storm in mm/hr
*''i'' = Intensity of design storm in mm/hr
*''q''' = Infiltration coefficient in mm/hr (accounting for SCF)
*''q''' = Infiltration coefficient in mm/hr (accounting for SCF)
*''SF'' = Safety factor
*''SCF'' = Safety correction factor
*''V<sub>R</sub>'' = Void ratio (porosity), as measured (or default to 0.35 for all aggregates)*
*''V<sub>R</sub>'' = Void ratio (porosity), as measured (or default to 0.35 for all aggregates)*
*''R'' = Ratio of catchment area (''A<sub>c</sub>'') to BMP footprint area (A<sub>p</sub>) syn. I/P ratio.
*''R'' = Ratio of catchment area (''A<sub>c</sub>'') to BMP footprint area (A<sub>p</sub>) syn. I/P ratio.