In Hydraulics mode, the program simulates the storage and transport of water through a drainage or sanitary sewer network. In this tutorial, you will learn how to utilize the various tools to layout the nodes and links in a simple collection network. Where possible, the tools are used to extract data from GIS files. The dialogs are used to add data to other objects.

This tutorial begins with the runoff collection model developed in Tutorial 2 - Surface Water Hydrology. You are advised to review Tutorial 1 - Introduction to the Graphical User Interface for an overview of the windows, menus, tools, and basic concepts for building and navigating a stormwater collection network with the graphical interface.


Introduce the steps required to:

  • Layout links and nodes in Hydraulics mode
  • Derive ground elevations and inverts from a DTM
  • Calculate pipe lengths from the model coordinate system
  • Enter the required data for links and nodes in dialogs
  • Enter the basic configurations settings for solving in Hydraulics
  • Obtain results from the output file and use the Review Results tool
Time1 hour
Data files

Yarra30.xp (From previous hydrology tutorial Yarra23m.xp)


  1. Make the Hydraulic network active:
    1. Launch the program. Open the file Yarra23m.xp and from the File menu, and Save As Yarra30.xp
    2. Toggle the visible box for the DTM layer to improve visibility. Clear the visible boxes for the Catchments and CAD Files.
    3. Set the mode to Hydraulics (Hdr) by clicking the icon 
    4. On the drawing tool, click the Select All Links and Select All Nodes icons and the Add object to Node (+) icon. Now all the nodes and links will be added to the Hdr mode.
    5. Right-click any link and select Reverse Direction to swap upstream and downstream nodes for all selected links.

  2. Rename objects:
    1. Select a link. Right-click and select Properties from the menu. 
    2. Edit the Link Name in the dialog to the label indicated in the figure below. Repeat for all links.  
    3. Add a new link Pipe 05 using the Link tool. Make sure that the directions of pipes are as per the following figure. To change the direction of the link, right-click and select the option Reverse Direction from the menu. For a group edit, you could use the Select All Links tool.
  3. Generate ground elevations:
    1. From the Tools menu, select Generate Ground Elevations From TIN
    2. In the dialog, uncheck all of the nodes below elevation 1280 and then click OK.

  4. Modify invert elevations:

    1. Select all links and nodes above elevation 1280. 

    2. In node Junction, right-click and select Select Upstream Objects from the menu. 

    3. Hold the <Ctrl> key down and repeat at node 5/1.  

    4. From the Tools menu, select Modify Elevations.

    5. In the dialog, select Drop Inverts From Node Spill Crest and enter 2.6 m. Select Set Node Inverts and Set Link Inverts and then click OK. The application will report the number of objects with modified inverts.

  5. Calculate conduit lengths:
    1. In the Tools menu, select Calculate Conduit > Lengths
    2. Click the All radio button and then click Calculate. Click OK.

  6. Enter node data in dialogs:
    1. Double-click node 3/1 to launch the Node Data dialog. 
    2. Enter 1279 for the Spill Crest and 1276 for the invert.

    3. In the Node Data dialog for node 3/375, enter 1278 for the Spill Crest and 1275 for the Invert Elevation
    4. Click the Outfall button. 

    5. Select Type of Outlet Control as Type 1, Free Outfall and Use minimum of Yc-Yn.

    6. Click OK three times.

  7. Enter link data in dialogs:

    1. Double-click link Pipe 01

    2. Click Conduit Profile.  Alternatively, select the link and press F3 to open the Conduit Profile dialog.  The upstream and downstream inverts and the length should have been entered in previous steps. Enter 0.5 m as the pipe diameter. 

    3. In the Solve for section, select Slope and click the Solve button. Note: this step is not required but serves as a check. 

    4. Edit the data for each link according to the table below.

  8. Add user inflow to nodes:

    1. Double-click node 3/1 to open the Node Data dialog.

    2. Click the User Inflow button in the Time Series Inflow section.

    3. Click the Insert button five times to add five blank data rows.

    4. Input the hydrograph data as shown in the figure below. This data represents the inflow from areas outside of the Yarra model.

    5. Add the same user inflow hydrograph to node 5/1.

  9. Add configuration settings:

    1. On the Configuration menu, select Job Control > Hydraulics

    2. Select Solve Runoff & Hydraulics Mode Simultaneously. This option eliminates the need for interface files. Set the Start and Stop times equal to the values used in the Runoff mode. Click OK

    3. Save your model as Yarra31.xp.

  10. On the Configuration menu, select Mode Properties. In the Solve Mode section, select both RUNOFF and HYDRAULICS.

  11. Make the Rnf mode active and make sure that all the links are inactive in the Rnf layer using the Select All Links tool and click the minus (-) tool. Also make sure that the newly added nodes (apart from the previous runoff nodes 5/2, 5/3, 5/4, 6/1, and 3/2) are inactive in the Rnf mode.

  12. Solve the model.  In the Analyze menu, select Solve.The application will display the calculation dialog and return to the network view.

  13. Obtain graphical results. Right-click Pipe09 and select Review Results from the menu.

  14. Obtain results from Output file: In the Results menu, select Browse File and open Yarra31.out.

    The output file can also be accessed on Analyze > Show Output Logs > Show 1D Log.


Review the output file (Yarra31.out) to answer the following questions:

  1. What is the total outflow at node 3/375? (Hint: Table E19.) ­­­­­                      _________

  2. What is the maximum flow in link Pipe09? (Hint: Table E15a).                   _________