Note: Steps in converting a Arc GIS 10 Model to a Arc GIS 9.3 Model in InfoSWMM or InfoSewer Step 1. Make an empty Arc GIS 9.3 model in InfoSWMM using the Arc GIS Default when initializing the model, Step 2. Save the empty model and then copy and paste the files from the Arc GIS 10 ISDB folder to the Arc GIS 9.3 folder, but not the MAP sub directory, Step 3. Open the Arc GIS 9.3 mxd file and then use the Tool Update Map from DB after Initialization, Step 4. Zoom to the model extents and then set data frame to the model view so it can be used more efficiently in the future before saving the model.