The most immediate change users encountered in Civil 3D 2015 was the radical redesign of the User Interface (UI). Moving away from the "Ribbon" aesthetic that had persisted for nearly a decade, Autodesk introduced a "Modern" dark theme.
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Civil 3D 2013 introduced pressure pipes, but they were unstable. By 2015 (Release 15), the pressure network engine had matured. Users gained the ability to create fittings and appurtenances via a Part Builder that actually behaved predictably, allowing for realistic water main design without third-party plugins. The most immediate change users encountered in Civil