Let’s expose a little bit of the magic on the AutoCAD Civil 3d 2010’s ability to import and export directly to the Hydraflow Storm Sewer STM file. Kevin Clark’s post on Civil3d.com prompted this post. I want to provide a little bit more of the background that is actually at work as it is simple and contains currently contains some of the wishes he asked for.
As with most Civil 3d commands, the Prospector Settings tab will be our destination. When you dig into the Pipe Network –> Command settings, you will see three commands.
The EditInStormSewers, ExportStormSewerData, and ImportStormSewerData commands are the treasure chest for interface and translation of Civil 3d structures to and from Hydraflow Structures.
I will save you the images, but each command has a Storm Sewer Migration Default Settings area as you see below. The key to Custom Civil 3d Parts being matched on either import / export is that you need to specify the Part List here first, then go one line above to the Part Matching Defaults to specify what matches what.
So, for the example below, I created a new Part List with my Custom Part, applied the Part Light Used for Migration, and then edited the matching part for Import.
At this point, you can specify your Custom Part for Import Only. The Export Part List doesn’t update based on the Part Catalog.
Have a great day!

great post. I will definitely have to try this. I was playing around with SSE 2010 last week and I had this problem.
Great follow up. Thanks.
I think there is an issue with trying to squeeze the almost unlimited possible structure types into the few hydraflow types. I think the functionality need to be expanded on the hydraflow side. Would be very nice if they just both used the same pipe catalog.