When working in ArcGIS mode, why are the tools in the Bentley Hydraulics and Hydrology product (WaterGEMS, SewerGEMS, or HAMMER) layout toolbar grayed out?
To be able to edit a Bentley Hydraulics and Hydrology model from within ArcMap the model needs to be added. To do this open the product menu, click File, and select "Add new hydraulic model" or "Add existing hydraulic model".
Once a model has bee added, enable editing by opening the Editor menu and selecting "Start Editing".
WaterGEMS for ArcGIS FAQs