The catchment and channel systems in SWMM can be imported to VO. The subcatchments are converted to either NasHyd or StandHyd based on the imperviousness and the open channel is converted to RouteChannel. It is not recommended to import models with detailed sewer networks.

The SWMM5 import function is available for single-event simulation. To import from a SWMM5 input file (.inp), select *File -> Import -> Import SWMM to open the Import SWMM to Otthymo window. Browse the SWMM input file by clicking the button below the exit button on the top right corner. Click OK to start the import. The imported model will be added as a new scenario to the current project.