Currently WaterGEMS, SewerGEMS and HAMMER are able to integrate with the ArcMap platform (in addition to the Standalone, AutoCAD and MicroStation platforms).
With the availability of ArcGIS Pro and the impending retirement of ArcMap, users that prefer to integrate with ArcGIS need to migrate to ArcGIS Pro.
Starting with version 10.03.02.75 of WaterGEMS (released on November 12th, 2020), and version 10.03.03.44 of SewerGEMS (release on February 22nd, 2021), integration with ArcGIS Pro is supported and you can read more about it here:
Overview of WaterGEMS for ArcGIS Pro
ArcMap integration will still be supported along with ArcGIS Pro, as some users will want to adopt ArcGIS Pro right away, while others may take time to transition away from ArcMap. The new ArcGIS Pro integration update will be available to SELECT subscribers at no additional cost. Subscribe to our Blog to receive alerts on new version releases.
Note also that WaterGEMS, SewerGEMS and HAMMER (and the other OpenFlows products) include a powerful Standalone platform which most modelers prefer and does not require any other software such as ArcGIS (and thus can save the cost of having to install and use ArcGIS on every modeler's computer). The ModelBuilder tool can be used to import (and synchronize) model data from an ArcGIS Pro data source. For example, see: Using an ArcGIS Utility Network to build a model.
Additionally, if you need to present hydraulic model information in ArcGIS Pro before the ArcGIS Pro direct integration is available, the ModelBuilder tool can "sync out" data back to the data source, and the OpenFlows products can also export to standard formats such as Esri Shapefile.
In addition to the overview article, two videos are available below, for a quick introduction, and a more in-depth training video, respectively.
Note that although the videos are for WaterGEMS, the same workflow and concepts apply to SewerGEMS (10.03.03.44+)