SewerCAD vs SewerGEMS??

Please have a look at this wiki technote about SewerGEMS vs. SewerGEMS Sanitary as it should answer most of your questions:

The part you want to read is the third entry on this general FAQ wiki page.

You might also want to read about the new unified schema update that was done with the storm sewer products for their most recent versions because this will expand upon the information in the previous link.

communities.bentley.com/.../6907.what-s-new-with-sewergems-v8i-selectseries-3.aspx

Yes, there were two separate versions, but not quite like you thought. SewerCAD was one product and SewerGEMS Sanitary was another, but they were essentially both SewerCAD because both used the same solver. The only real difference was that SewerGEMS Sanitary came packaged with SewerGEMS and had the ability to integrate with ArcGIS. This is all discussed in the wiki technote that I linked to above.

I hope that helps out.

Regards,

Mark

With SewerGEMS SS3 release Bentley accomplished a convergence of SewerGEMS Sanitary modeling fully into SewerGEMS. As a result SewerGEMS embodies effectively a superset of the capabilities delivered in StormCAD, CivilStorm, SewerCAD, and SewerGEMS. All consolidate into a common data store. All differentiate by the computational engines that are selectively packaged into each product in service to a range of commercial use-cases across stormwater, sanitary, and combined systems.

With this release SewerGEMS Sanitary was deprecated. It was cleanly folded into the SewerGEMS application.

In general, I like to think of the SewerCAD application as a bread-and-butter package that delivers conventional design and capacity analysis. Municipal-scale master planning is certainly part of it. But it serves very well in site/civil arena as well.  Sanitary and storm loadings are part of it. Routing is hydrologic with conventional back-water dominant hydraulics. Gravity analysis is complete with well-accepted state-of-the-practice hydraulic grade analysis with form losses. Diversions or splits are handled in explicit ways. I&I, similarly, is modeled using an array of fundamental and appropriate simplifying models.

SewerGEMS layers into the mix engines for dynamic wave simulation. So, if you have challenging cross-connections, loops or dynamic surcharging and ponding, this gives you the capabliities of EPA SWMM along with Bentley's own implicit solver. Your continuous simulations would be done using SewerGEMS.

So, SewerGEMS differentiates in the market as being a singular tool that will carry the engineer though all stages of design and analysis from conventional capacity and automated design of pipe networks into complex hydraulics of combined-sewer systems. SewerGEMS will handle both storm and sanitary models. It is top of the line. Importantly, if you have any old StormCAD, SewerCAD, CivilStorm files they can all be loaded into SewerGEMS SS3 and brought cleanly ahead.

As a supplement to Mark and Jack's posts, I've pulled together information from a few different sources regarding SewerCAD (and the GVF Convex solver) vs. SewerGEMS (and the implicit/explicit dynamic solvers) vs. SewerGEMS Sanitary:

SewerCAD vs. SewerGEMS vs. SewerGEMS Sanitary

I hope you find this to be a helpful reference.