In order to properly represent the floodplain area and develop an accurate geometry for the river analysis, the DTM must have representative data in the main channel and the overbank areas. The RAS Terrain support is for raster data of many formats, but once processed, the data will be stored in the GeoTiff format. HEC-RAS supports the use of a digital terrain model (DTM) for representing the bare earth ground surface. HEC-RAS supports the use of terrain data in a raster format - once terrain data has been imported to HEC-RAS it is referred to as a RAS Terrain. A good terrain model represents the ground surface well in locations that affect the movement of water through the floodplain. The first step in creating a good hydraulic model is having good terrain data.
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