Addition of infiltration flows to foul drainage models in subcatchment items

When designing foul pipe networks, client guidance often directs users to incorporate an allowance for infiltration into pipes from the surrounding ground water. This is applied in addition to foul flows currently defined using the Main Drainage/ Industrial/ Discharged Unit categories. Could functionality be added to InfoDrainage which allows infiltration flows to be applied in foul subcatchments. For example a percentage infiltration of l/s/ha variable which is linked to the Catchment Area would allow this to be calculated automatically.