Now, C3DRENESG is available ate Autodesk Exchange Apps!!
See it here: http://apps.exchange.autodesk.com/CIV3D/en/Detail/Index?id=appstore.exchange.autodesk.com:c3drenesg_...
C3DRENESG is a program for design urban drainage and sewage systems that runs inside Autodesk® AutoCAD® Civil 3D.
It uses the feature PipeNetworks making the launch of networks and profiles very convenient and fast.
As it runs within Civil 3D, you do not need to export the project or even network to external programs, scale and then import the results into drawing or manually modify the design.