In WaterGEMS for MicroStation when I use the Save Symbology option and then export the drawing to a .dwg/.dgn/.dxf file the flow arrows are not saved. Why is that?
The save symbology function only works to update the MicroStation symbology such as color, line weight, and size. The flow arrows are decorations, which are not saved using this symbology function. The reason for that is because the OpenFlows product draws the decorations at draw time, therefore, unless the user is running an OpenFlows product, they can't see it.
Starting with the CONNECT Edition Update 2 release of WaterGEMS, WaterCAD, and HAMMER, it is possible to export flow arrows into shapefiles, allowing you to add this to presentations in various platforms. This link has more information on this: Exporting flow arrows as shapefiles for display in other platforms.
Exporting flow arrows as shapefiles for display in other platforms