Analyze a Gravity Network
John Sayre of Autodesk quickly demos the 2017 and new 2018 Gravity Analysis Wizard.
Where to get to the wizard in the v1 Enhancement Toolbox is covered.
The Civil 3D Gravity Analysis Wizard
John demos the 2017+ Gravity Analysis Wizard and Pipe System Sizing Tool.
The tool supports the FHA (HEC 22 2009) Standards.
This tool is also included in Civil 3D 2018 release.
From the from John Sayre YouTube channel
Note that John employs Known Q inlet values in the video (a regular input value) and not cachement to inlet methodology which is also supported.
This link to the Civil 3D 2018 on-line help includes a decent overview of the Gravity Analysis Wizard
This link to the Civil 3D 2017 v1 Enhancement on-line help includes the same overview of the Gravity Analysis Wizard
Pay very careful attention to your Parts List, cachment construction, and the Wizard Settings before pushing the button.