HEC-RAS Guides and Tutorials Current: Guides PDF Download PDF Download page Guides. Current page Include child pages All pages Guides Guides are intended to be short overviews of how to do something. Downloading Terrain Data Creating an Combined 1D/2D Model Export Channel Data for Terrain Re-projecting Model Geometry Creating a Terrain Dataset to Model a Flume Experiment Modeling Steep Reaches GDAL Projection File Warning Skip SRS Translation For Terrain Imports Aligning Cell Faces in Channels with Refinement Regions Modeling Weirs in 2D Areas Terms of Use Any use or reproduction of this material must be attributed to the US Army Corps of Engineers Hydrologic Engineering Center. ×