When updating a model using GIS snapshots some of the pipes, junctions and hydrants in the model are inexplicably moved incorrectly. After some debugging the reason for the error seems to be that the modelbuilder incorrectly handles a polyline when it has been reversed in the GIS between the time the model was originally created and the time when it is updated. I've uploaded all the relevant GIS shapefiles, model files, snapshots and model builder connections via secure upload (file name: Evides_Modelbuilder_GIS_Update_Reversed_Pipe_Error.7z). The workflow that can be used to reproduce the topology error: Build model using original GIS shapefiles, split pipes with hydrants & junctions, update model using update GIS shapefiles. This creates the topology containing the errors. After some debugging I found 1 polyline that was reversed in the update GIS shapefiles, after reversing (flipping) the polyline in the shapefile using ArcGIS and then updating the model using the reversed polyline shapefile the topology errors were gone. However, doing this manually for all the pipes in our GIS (which is quite large) would be infeasible. Modelbuilder using GIS snapshots should be able to handle this just like any other change/update in the GIS. Original GIS Updated GIS Original Model Updated model with topology errors
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