I know SSA 2014 open channel (trapezoidal, triangle, rectangular). We can draw gravity pipe network from civil 3D. And, we can export design and analysis. After completion of design, it can bring back to civil 3D.
Same way I am expect from your side help, if we can try to reach next level design pressure pipe network calculation and open channel calculation.
Once design completion it can update able to Civil 3D .