Add Rain Gages
To add rain gages using the drag-and-drop system:
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Add a point feature layer in ArcGIS Pro map to represent the model rain gages. 
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Select the layer in TOC. Drag it into the GeoSWMM Object Panel and release the mouse button over the Rain Gages. The object property mapping window will appear. 
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Assign the property fields accurately and click Ok. 
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Now click on Save to update the model and store the information into the geodatabase. 
To add rain gages using the conventional ArcGIS Pro editing technique:
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Select the Rain Gages layer in the SWMM geodatabase in the ArcGIS Pro map TOC. 
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Now go to Edit Section and enable editing. 
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Now create or edit the features in the selected layer using the options provided in the ArcGIS Pro Edit Section. 
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Assign the required attributes for the created or edited features. 
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After feature editing is complete, save and stop editing the layer. 
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Now click on the Reload button in the GeoSWMM tab to update the model.