Hi
One of the biggest hurdles why many Australian engineering companies stay with using 12d over civil 3D as their preferred civil engineering modelling package is the limited hydraulic analysis and functionality of civil 3D. Storm and Sanitary analysis is not applicable to Australian hydraulic analysis and practice.
12d has unsteady flow drainage modules and 2D drainage modules that complies with Australian Standards and Australian guidelines. I know there is a new 2D hydraulic engine/model package that can be used in Infraworks and I think this could be promising for use in Australia (further down the track).
As the very first step for civil 3D to improve its drainage functionality is to have a Drains (by watercom) import/export functionality. This was the first step that 12d used when developing its drainage analysis functionality for use in Australia. Drains is one of the most popular and accepted hydraulic package in Australia. This should be a very quick and easy task autodesk to add into the next update for civil 3D.
Let me know if you want me to expand or explain any of the above in more detail.
Thanks
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