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  4. Compute Steady – Current Scenario Command
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  3. HEC-RAS Computations
  4. Compute Steady – Current Scenario Command

Compute Steady – Current Scenario Command

When all geometric data and flow data are entered in the model, the user can perform the hydraulic calculations. In GeoHECRAS, the Compute Steady – Current Scenario command allows the user to perform an analysis of the current scenario (plan) for steady flow models.

Follow the steps below to use the Compute Steady – Current Scenario command for steady flow analysis:

  1. From the Analysis ribbon menu, click the Compute Steady dropdown combo box and select the Current Scenario command.
    Compute Steady Current Scenario Analysis ribbon menu command
  2. The Compute Steady – Current Scenario dialog box will be displayed.
    Compute Steady – Current Scenario dialog box

The following sections describe the Compute Steady – Current Scenario command and how to interact with the above dialog box.

Scenario Data

This section allows the user to define the scenario data to be used in the steady flow simulation.

The following parameters are provided in the Scenario Data section:

  • Scenario (plan)
    This dropdown combo box allows the user to select the scenario for which the analysis will be performed. The dropdown combo box lists all the steady flow scenarios that are already defined in the project. By default, the current scenario is selected.
  • Geometry
    This read-only field contains the corresponding geometry for the selected scenario.
  • Steady flow
    This read-only field contains the corresponding steady flow for the selected scenario.

Computational Options

This section allows the user to define the flow regime to be computed by the HEC-RAS steady flow analysis engine.

The Flow regime dropdown combo box lists the following options:
Flow regime dropdown combo box

  • Subcritical flow: This option requires only downstream boundary conditions. By default, this option is selected.
  • Supercritical flow: This option requires only the upstream boundary conditions.
  • Mixed flow: This option requires both upstream and downstream boundary conditions.

Profile Analysis Selection

This section allows the user to select the profile to be computed.
Profile Analysis Selection section

This section has a table that lists all profiles defined in the project. The user can select the desired profile by checking the checkboxes available in the Perform Analysis column corresponding to each profile name available in the Profile Name column to display the output result. By default, all profiles are selected.

The user can click the [Select All] button to select all profiles listed in the table to analyze.

The user can click the [Clear All] button to cancel all the profiles selected in the table and redo the entire process.

Computing Steady Flow Analysis

When all the options have been properly defined, click the [Compute] button. This will cause HEC‑RAS to perform the analysis for the current scenario. Note that the Compute Steady – Current Scenario dialog box will be closed on clicking the [Compute] button.

If a problem is detected in the model data or analysis, the software will display a dialog box detailing the issue and will stop the process. Otherwise, the HEC-RAS Finished Computations dialog box will be displayed once the computations are finished.
HEC-RAS Finished Computations dialog box

Click the [Close] button to close the dialog box.

About the Author Chris Maeder

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