An HEC-RAS alternative consists of model geometry, boundary conditions, and a plan file linking the two. If the HEC-RAS project contains more than one plan (steady flow and unsteady flow conditions, for example), you can build HEC-RAS model alternatives around each of the plans.

Importing an HEC-RAS Alternative

To import an HEC-RAS model alternative: 

  1. From the Watershed Panel in the Setup module, right-click on the HEC-RAS icon and select Import. The Select RAS project to import from dialog will open.
    Select RAS Project To Import From Dialog
  2. Navigate to and select an HEC-RAS project file (.prj extension) you wish to import and click Open. The import begins and an Import Progress dialog opens displaying the progress. The Import Progress dialog closes when the import is complete and the Message window will show RAS Import Complete.
  3. Save your watershed.

Editing an HEC-RAS Alternative

To edit an HEC-RAS alternative: 

  1. From the Watershed Pane in the Setup module, right-click on the HEC-RAS alternative you want to edit and select the model component you wish to modify.
    HEC-RAS Shortcut Menu
  2. Edit the HEC-RAS alternative as desired. For further information on how to modify HEC-RAS alternatives, see the HEC-RAS User's Manual.

Copying an HEC-RAS Alternative

To copy an HEC-RAS alternative: 

  1. From the Watershed Pane in the Setup module, right-click on the HEC-RAS alternative you want to copy and choose Plan Data from the shortcut menu. The HEC-RAS Plan editor will open.
  2. From the File menu, select Save Plan As. The Save Plan Data As dialog will open.
    Save Plan Data As Dialog
  3. From the Save Plan Data As dialog, specify a new plan name in the Title field. 
  4. Click OK, and the Plan Identifier dialog will open.
    Plan Identifier Dialog
  5. Enter an identifier in the Plan Identifier dialog. Click OK to complete the copy process.

Deleting an HEC-RAS Alternative

To delete an HEC-RAS alternative: 

  1. From the Watershed Pane in the Setup Module, right-click on the HEC-RAS alternative you want to delete and choose Plan Data from the shortcut menu. The HEC-RAS Plan editor will open.
  2. From the File menu, select Delete Plan, and the Delete Plan File dialog will open.
    Delete Plan File Dialog
  3. From the Delete Plan File dialog, select the plan you want to delete, and click OK.
  4. A Delete Plan File confirmation dialog will open. Click OK to complete the deletion process.