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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

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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