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[Scroll down for a video.]*The steps below describe the process for opening a WaterGEMs model that has not already been opened in WaterGEMS for ArcMap and associated with an .MXD file. This might occur when you have created or received a model in WaterGEMS Standalone, WaterGEMS for AutoCAD, or WaterGEMs for Microstation and are opening it for the first time in WaterGEMS for ArcMap.
1) Open WaterGEMS for ArcMap
2 ) Click the WaterGEMS V8i menu, choose "Project" > "Add Existing Project". *If you don't see this toolbar please navigate to this page"
3) Select your WaterGEMS model
4) Click the blue folder icon in the 'Attach Geodatabase' window to create a new geodatabase
This is necessary because WaterGEMS interacts with ArcMap through this separate personal geodatabase (.mdb file). Note: If you get a message that says "WaterGEMs project cannot be a geodatabase" this means that the name you tried to give your geodatabase has the .wtg extension in it. Simply remove the extension and your new geodatabase will be created or add "_GDB" at the end.
[Optional] Ensure that you assign the correct coordinate system/spatial reference, before clicking OK in the 'Attach Geodatabase' window.
When you click the "Ok" button, the Table of Contents will be populated with the layers for WaterGEMS element types and your model should appear shortly after. You may need to use the zoom extents button or zoom to an element using the search button at the top of the WaterGEMS properties window.
Note: your WaterGEMS model must be saved in V8 XM or V8i format already (.wtg file). If you are trying to open a WaterCAD V7 and below model, you must first open it in the Standalone platform of WaterGEMS V8i and save it in V8i format.