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Is there a way to easily input a new water or storm/sewer model into an existing MXD file, including an MXD file with an associated model?
This is an area that we will be developing more seamlessly in the future. For now, you can use the following information. If you are starting with an MXD file that hasn't previously had a water or storm/sewer model associated with it, you can import the model file using the steps found in this link: Opening a Hydraulic Model in the ArcMap (ArcGIS) platform for the first time.
If the MXD file already has a hydraulic model associated it with it, the steps will require a little work ahead of time. If there is a model already associated with it, there is not an easy way to import the model file without some issues, such as multiple layers appearing in the ArcMap Table of Contents. To work around this, it is recommended that you create a template or seed MXD file. This will be an MXD that contains important information common across multiple usages. One example is a case where you may want to create a copy of the model to do future work on.
Once the seed or template MXD is created, this can be the starting point for future modeling. Simply save the seed file with a new name, then import the hydraulic model as you normally would.
This workflow will be improved in future releases of the programs.
How do I open a model that is already associated with an ArcGIS MXD file?
WaterGEMS for ArcGIS FAQ
SewerGEMS for ArcGIS FAQ