Users can select either ARBM Infiltration equations or an initial/continuing loss rate approach to estimating subcatchment excess rainfall by clicking either the First Subcatchment or Second Subcatchment buttons on the Catchment Data window. 

Selecting either Initial/Continuing or ARBM loss methods will bring up a selection window where users can choose an applicable Loss Reference. The type of Loss Reference used by the system will depend on the loss type selected in the Catchment Data window for the  for the total subcatchment.