I get a red user notification that says, "Inlet guttter mannings n should be greater than 0". How can I fix this problem?
Global edit all your catch basins that are set to an inlet location of "In Sag" to be "On Grade".
Set the "Mannings N (Inlet)' value to something greater than 0.00
Global edit all your catch basins back to "In Sag"
Run your model