How can I convert my GIS data to a water or storm-sewer model inside ArcMap and ArcGIS Pro?
1) Follow the steps here for creating a new model for either WaterGEMS or SewerGEMS for ArcGIS Pro or WaterGEMS or SewerGEMS for ArcMap.
2) Use the steps for creating a new model using the ModelBuilder tool to import the GIS data. ArcGIS geometric network or ArcGIS Geodatabase features can be used, as well as other source file types typically available in the standalone platform.
WaterGEMS for ArcGIS Pro and WaterGEMS for ArcMap FAQ
SewerGEMS for ArcGIS Pro and SewerGEMS for ArcMap FAQ