About Analyzing and Sizing a Gravity Pipe Network
You can use the Analyze Gravity Network command to resize pipes and reset inverts and to compute the energy and hydraulic grade lines according to HEC-22 standards.
About the Hydraulics and Hydrology Features Autodesk 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.