ORD DU - Curb Opening Inlets - Length Required

While I know Efficiency is the ratio of Actual Lenght to Required Lenght - is there a way to annotate or label the length required to capture 100% of the flow in ORD DU?
Vertical Coordinate System 1.5' too high

I have produced a reality mesh in Itwin capture with the proper coordinate system, when I bring into Openroads with the same horiz. vert. coordinate system it is 1.5' too high. Does anyone know what Im...