This article explains how to define the invert elevation for multiple conduits coming into one manhole, since the manhole only has one invert field. The manhole element has several invert elevation fields available besides "Elevation (Invert)". These are, "Elevation (Invert in 1)" , "Elevation (Invert in 2)", "Elevation (Invert in 3)", etc...These fields take the invert elevations of all incoming conduits to a manhole. The maximum limit of incoming conduits to a manhole is 5. These fields are available in the manhole properties;
The 'Elevation (Invert in 1)" , "Elevation (Invert in 2)", "Elevation (Invert in 3)", etc... fields only apply to the GVF-Convex (SewerCAD) solver and the GVF-Rational (StormCAD) solver. They will not display information for the Implicit (SewerGEMS, CivilStorm) solver or the SWMM solver.
The inverts of conduits are set in the properties of your conduits
Double click on the first upstream conduit to open the properties of it.
Look for the property called "Set invert to Stop?" and set it to 'False'. Confirm that the stop node is correctly set to the downstream node in question.
Once done have the option to enter the value for the 'Invert(Stop)' field.
Repeat steps 1-3 for the other incoming conduits.
*If the "Set invert to Stop?" is set to 'True' the 'Elevation (Invert in 1)" , "Elevation (Invert in 2)", "Elevation (Invert in 3)", etc... field will still populate the values from the other conduits, but you will not be able to set the values. Therefore, the values are automatically populated from the elevation invert fields of the upstream/downstream manhole.
For example, in the screen shot below the invert level of the manhole in the blue box would populate the 'Elevation (Invert in 1)" field automatically, instead of letting the modeler enter a value.
Setting Boolean (True/False) fields using ModelBuilder