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User Notification, "The culverts outlet coefficients are to be defined by the Stop Node, but that node is not a Headwall"
If you have a catch basin at the downstream end of your conduit and a headwall at the upstream end that will be an improper configuration. As a workaround set the properties for the Culvert that is upstream of the catch basin to use a Culvert Endwall of type 0 degree wingwall flares with a Kr value of 0.00.The wingwall will provide little to no hydraulic friction loss and will be a valid configuration.
Headwalls