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*''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'' = Infiltration rate of underlying soil in mm/hr
*''q''' = Infiltration rate of underlying soil in mm/hr
*''SF'' = Safety factor
*''SF'' = Safety 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)*