• InfoWorks ICM

Performing a river section conveyance check

Check the conveyance for a river section and add panel markers to improve the calculated values.
 


Tutorial resources

These downloadable resources will be used to complete this tutorial:

Pop_Rivr_Rch_Sect_Data.icmt

Step-by-step guide

The conveyance calculated for river sections is important for the accuracy and stability of a model. If there are abrupt changes in roughness or slope, then a panel marker may not need to be set at each change. This is a manual process if they are not included in the original import. The panel markers assist in the calculation of the conveyance curve that is used during simulations.

To complete this exercise, copy the network out of the transportable database .icmt file for this tutorial or carry on from the previous exercise.

  1. From the Database, double-click the 1D River Model to open it on the GeoPlan.

In the Model Group window, the 1D River Model is highlighted and called out.

  1. From the Modelling Grid Windows toolbar, select New lines window.

In the Modelling Grid Windows toolbar, the New lines window button is selected.

  1. In the Cross section line window, in the table margin of cross section ID 16, right-click and choose Select and find in geoplan.

In the New lines window, the cross section 16 shortcut menu, with the Select and find in geoplan option selected and called out.

  1. From the More GeoPlan Tools toolbar, click Conveyance Graph Pick.
  2. On the GeoPlan, click the selected cross section to open the graph.

A conveyance graph of the selected cross section showing a drop as the elevation increases, instead of a smooth curve.

It should be a smooth curve from the bottom-left to the top right. The conveyance of this curve currently drops back down as the elevation increases, which can cause simulation instability. To correct this, add panel markers to aid the calculations:

  1. Close the graph window.
  2. Select Tools > Options.
  3. In the Options window, switch to the General tab.
  4. Enable Allow editing of river reach data.

In the Options dialog box, General tab, Allow editing of river reach data is selected and highlighted.

This allows the river section data to be altered directly. Otherwise, the cross section line data would need to be updated first, and then the river reach section data would need to be built again to update it.

  1. Click OK.
  2. In the GeoPlan Tools toolbar, click the Select tool.
  3. On the GeoPlan, double-click the 16DS river reach to open the Properties window.
  4. In the River sections row, click the More () button to open the sections data.

In the GeoPlan, the selected river reach highlighted in red, and in the Properties window, in the River sections field, the More (…) button selected and called out.

  1. In the River sections data window, under Sections, select 16.
  2. Under Survey Points, for rows 7 and 34, enable New panel.

This adds panel markers at the top of the banks where there is an abrupt change in slope, especially on the left hand side. The panel markers are indicated in the graph by vertical blue lines.

In the River sections data window, row 34 is selected with New panel enabled, and OK is selected.

  1. Click OK.
  2. Click Conveyance Graph Pick.

In the toolbar, the Conveyance Graph Pick is selected and called out.

  1. Click the 16DS cross section to open the graph.

The graph line is now smoother and monotonic.

A conveyance graph of the selected cross section now showing a smooth curve from the bottom left to the top right.

  1. Close the graph.
  2. Click Commit changes to database.
  3. Add a comment of “River section data imported and checked”.
  4. Click OK.
  5. In the validation popup, select No. This model contains errors, as it is not fully connected.