About Analyzing and Sizing a Gravity Pipe Network
You can use the Analyze Pipe Network wizard to resize pipes and reset inverts and to compute the energy and hydraulic grade lines according to HEC-22 2009 standards.
About the Hydraulics and Hydrology Features AutoCAD Civil 3D includes additional software applications that allow you to perform a variety of storm water management tasks, including storm sewer design, watershed analysis, detention pond modeling, and culvert, channel, and inlet analysis.