How to Make an Internal Outfall into an External Outfall when you have more than one link connected to an Outfall in SWMM5 or 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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