How to Make an Internal Outfall into an External Outfall when you have more than one link connected to an Outfall in InfoSWMM


Subject:  How to Make an Internal Outfall into an External Outfall when you have more than one link connected to an Outfall


    Step 1:  Identify the Problem "ERROR 141: Outfall J-561 has more than 1 inlet link or an outlet link." Means you have an outfall node in the middle of your model.


Step 2:  Make a new outfall.


Step 3:  Make the new Outfall  have the same invert as the old outfall 


Step 4:  Convert the older outfall  to a Junction using the Pick Axe and the Convert Type tool


Step 5:  Make a new Link connecting the old and the new Outfall

Step 6:  Convert the new Link to an  Outlet Type using the Convert Type Tool.


Step 7:  Set up the parameters for the new Outlet Link


Step 8:  For those outfalls that DO have more than one link you need to make a new Outfall.




You should be able to run the model now

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