"Multiple Outputs" Error
When calling the command 
C3DCALC, the network will be listed by C3DRENESG and it should pass
in consistency test.
If any structure has more than one output, as shown below:
Will show this error:
For convenience, will be made "zoom" in the network location where this error occurs.
Correct direction
pipe, remembering that the flow should ALWAYS go upstream to downstream.
Thus, in Toolspace "Start Structure" will always be
the amount of structure.