Create a New GeoSWMM Project
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Open a new ArcMap 10. x window.
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Select New from the GeoSWMM Project menu or click on the (
) button in the GeoSWMM toolbar. -
Provide a suitable directory for a valid geodatabase name and the Project Coordinate System, and then click Ok. A new GeoSWMM project geodatabase will be created with all the default feature layers.

Fig.115: Creating a new GeoSWMM project