Changes

This may be desirable where the practice is located on particularly freely draining soils and/or where the design storm is of longer duration.  

This may be desirable where the practice is located on particularly freely draining soils and/or where the design storm is of longer duration.  

To calculate the required practice area (''A_p'') or footprint where the depth is constrained:

To calculate the required practice area (''A_p'') or footprint where the depth is constrained:

:<math>A_{p}=\frac{A_{c}iD}{V_{R}d+q'D}</math>

:<math>A_{p}=\frac{A_{c}iD}{V_{R}d+f'D}</math>

{{Plainlist|1=Where:

{{Plainlist|1=Where:

*''D'' = Duration of design storm in hrs

*''D'' = Duration of design storm in hrs

*''i'' = Intensity of design storm in mm/hr

*''i'' = Intensity of design storm in mm/hr

*''q''' = Design infiltration rate in mm/hr

*''f''' = Design infiltration rate in mm/hr

*''V_R'' = Void ratio (porosity), as measured (or default to 0.35 for all aggregates)   

*''V_R'' = Void ratio (porosity), as measured (or default to 0.35 for all aggregates)   

*''A_p'' = Area of the infiltration practice in m²

*''A_p'' = Area of the infiltration practice in m²