When exporting a model to EPA SWMM the catchments no longer appear and the catchment inflow is moved to the downstream node. Why is this?
The catchment element will only be retained when exporting the model to the EPA SWMM (.inp) format if the catchment in the original model (.stsw) was set to use the runoff method "EPA-SWMM Runoff".
When exporting a model to the EPA SWMM (.inp) format catchment inflow data will be moved to the downstream node (ie. Outflow Element) if the catchment's runoff method is set to anything other than "EPA-SWMM Runoff".
Help Topic "Exporting to SWMM 5"