The terrain is used to identify the ground surface elevation across an area of interest. 

Terrain FDA icon Please note that only 1 terrain file may be imported. Import terrain as a HEC-RAS terrain. A RAS Terrain is a .hdf file paired with one or more .tif files. Select the .hdf file when importing your terrain and ensure the accompanying files are included in the same subdirectory. A terrain file is required if you're relying on hydraulic data in HDFs or if you do not have elevation data in your structure inventory (e.g., only foundation heights but no ground elevations). 

  1. Import terrain if using terrain to identify ground elevation at structures or if using hydraulics from HEC-RAS in HDF file. From the Study Tree, right-click on Terrain and select the Import Terrain command.
    Import Terrain shortcut command opened by right-clicking the Terrain study element 

  2. A name and path to the terrain file are required for import, as in the image below. Click the browser ellipse button to navigate to the appropriate file (e.g., HEC-RAS Terrain, HDF file) and click Open. Click OK to import the terrain file.
    Import Terrain tab, example completed dialog.