Hydraulic grade line in a profile is below the invert of a conduit or channel

Applies To 
Product(s): SewerGEMS, CivilStorm, StormCAD, SewerCAD
Version(s): CONNECT Edition, V8i
Area:  Output and Results
Original Author: Mark Pachlhofer, Bentley Technical Support Group


The hydraulic grade line in the profile is showing up below a conduit or channel. Why is this happen?


1)  Go to View > Queries and create a new project query by right clicking on Query- project > New > Query > Conduits. You’ll make a query based on the Slope(Calculated) property and the dialog box in the query manager should read as follows “DerivedLinkResults_Slope < 0”. This will select all conduits that have a negative slope.

2)  Go to View > Network Navigator and click on the “ > ” icon. From the menu select the name of the query you just created in step 1.

3)  On the network navigator window select the icon that looks like a pencil and this will highlight all the conduits in your drawing that have a negative slope.

4)  Right click on each conduit individually and select the “Reverse” option.

If this occurs for many pipes, see below article:

Reversing orientation of Pipes and Conduits in Bulk

You should also make sure you have the latest patch set applied to your software. You can download it using these instructions.


This has been noted in some profiles where the start and stop nodes and the slopes are correct. In such cases, advancing the profile to the next time step may show the hydraulic grade line in the profile correctly.

  • Created by
  • When: Fri, Jun 12 2015 4:20 PM
  • Last revision by Bentley Colleague
  • When: Tue, Oct 20 2020 2:42 PM
  • Revisions: 7
  • Comments: 0