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Line 48: − To calculate the required depth, where the area of the facility is constrained: − <math>d=\frac{D\left[Ri-q'\right]}{V_{R}}</math> − To calculate the require facility area or footprint where the depth is constrained: − <math>A_{p}=\frac{IiD}{V_{R}d+\left ( \frac{q}{SCF} \right )D}</math>
→Determine the effective infiltration coefficient
*''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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{| class="wikitable style="border: none; background: none;"
|To calculate the required depth, where the area of the facility is constrained:
<math>d=\frac{D\left[Ri-q'\right]}{V_{R}}</math>
|To calculate the require facility area or footprint where the depth is constrained:
<math>A_{p}=\frac{IiD}{V_{R}d+\left ( \frac{q}{SCF} \right )D}</math>
|}
{{Plainlist|1=Where:
*''D'' = Duration of design storm in hrs
*''i'' = Intensity of design storm in mm/hr
*''q''' = Infiltration coefficient in mm/hr (accounting for SCF)
*''SCF'' = Safety correction factor
*''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.
*''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>
*''d'' = Depth of infiltration practice in m.}}
They may be easily applied for any shape and size of infiltration facility, in which the reservoir storage is mostly in an aggregate.
They may be easily applied for any shape and size of infiltration facility, in which the reservoir storage is mostly in an aggregate.
{{Plainlist|1=Where:
{{Plainlist|1=Where: