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

Import a HEC-RAS Alternative

To import a HEC-RAS model alternative: 

  1. From the File menu, point to Import, click HEC-RAS, the Select HEC- RAS project to import from browser (Figure 1) opens.
    Figure 1 Select HEC-RAS project to import from Browser
  2. From the Select HEC-RAS project to import from browser, navigate to and select an HEC-RAS project file (.prj) you wish to import, click the Open button. The import begins and an Import Progress dialog opens displaying the import progress. The Import Progress dialog closes when the import is complete and the Message window will show "RAS Import Complete".
  3. Save your watershed.

Edit a HEC-RAS Alternative

To edit a HEC-RAS alternative: 

  1. From the Watershed Pane in the Setup Module, select the HEC-RAS alternative you want to edit.
  2. Right-click the selected HEC-RAS alternative and the HEC-RAS Shortcut Menu (Figure 2) appears.
    Figure 2 HEC-RAS Shortcut Menu
  3. From the HEC-RAS Shortcut Menu select the HEC-RAS component you wish to modify. Edit the HEC-RAS alternative as desired. For further information on how to modify HEC-RAS alternatives, see the HEC-RAS User's Manual.

Copy a HEC-RAS Alternative

To copy a HEC-RAS alternative: 

  1. From the Watershed Pane in the Setup Module, select the HEC-RAS alternative you want to copy.
  2. Right-click the selected HEC-RAS alternative and the HEC-RAS Shortcut Menu (Figure 2) expands.
  3. Click Plan Data, and the HEC-RAS Plan editor opens.
  4. From the File menu, select Save Plan As, and the Save Plan Data As dialog (Figure 3) opens.
    Figure 3 Save Plan Data As
  5. From the Save Plan Data As dialog, specify a new plan name in the Title field. 
  6. Click OK, and the Plan Identifier dialog (Figure 4) opens.
    Figure 4 Plan Identifier Dialog
  7. Enter an identifier in the Plan Identifier dialog. Click OK to complete the copy process.

Delete a HEC-RAS Alternative

To delete a HEC-RAS alternative: 

  1. From the Watershed Pane in the Setup Module, select the HEC-RAS alternative you want to delete.
  2. Right-click the selected HEC-RAS alternative and the HEC-RAS Shortcut Menu (Figure 2) expands.
  3. Click Plan Data, and the HEC-RAS Plan editor opens.
  4. From the File menu, select Delete Plan, and the Delete Plan File dialog (Figure 5) opens.
    Figure 5 Delete Plan File Dialog
  5. From the Delete Plan File dialog, select the plan you want to delete, and click OK.
  6. A Delete Plan File confirmation dialog opens. Click OK to complete the deletion process.