Run the executable file ( .exe ). The installer will automatically detect your ArcGIS installation and install necessary components.

: Exporting RAS results back into ArcGIS to generate depth grids, velocity grids, and floodplain boundary polygons. Installation & Setup for ArcGIS 10.8

HEC-GeoRAS is a GIS-based tool that allows users to preprocess and postprocess data for hydraulic modeling using the Hydrologic Engineering Centers River Analysis System (HEC-RAS). It's developed by the US Army Corps of Engineers.

Extracting elevation data perpendicular to flow. Land Use Attributes: Assigning Manning’s values for hydraulic roughness.