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This tutorial is designed to expose you to basic functions in HEC-GeoRAS for pre- and/or post-processing of GIS data and HEC-RAS results for flood inundation mapping using ArcGIS. It is expected that you are familiar with HEC-RAS and ArcGIS. If you want to get into details of HEC-GeoRAS that are not covered in this tutorial please refer to the HEC-GeoRAS users manual. The only essential data required for HEC-GeoRAS is the terrain data (TIN or DEM). Additional datasets that may be useful are aerial photograph (s) and land use information. The dataset supplied with this tutorial includes a small portion of the fictional Baxter River available with HEC-GeoRAS users manual. Start ArcMap by clicking Start Programs ArcGIS ArcMap. Save the ArcMap document (by clicking File Save As..) as baxter_georas.mxd in your working folder. Since Hec-GeoRAS uses functions associated with ArcGIS Spatial Analyst and 3D Analyst extensions, make sure these extensions are available, and are enabled. You can check this by clicking on Tool Extensions.., and checking the boxes (if they are unchecked) next to 3D Analyst and Spatial Analyst as shown below: The HEC-GeoRAS toolbar has four menus (RAS Geometry, RAS Mapping, ApUtilities, Help) and seven tools/buttons (Assign RiverCode/ReachCode, Assign FromStation/ToStation, Assign LineType, Construct XS Cutlines, Plot Cross Section, and Assign Levee Elevation) as shown in circles and boxes, respectively in the figure below. Using GIS for hydrologic/hydraulic modeling usually involves three steps: 1) pre-processing of data, 2) model execution, and 3) post-processing/visualization of results. It is common to use a single map document to handle a single project, but this ends up with too many feature classes/layers in a single map. It is then cumbersome to find out which feature classes were used during pre-processing, and which feature classes contain results for visualization. To avoid this confusion. Creating RAS Layers The geometry file for HEC-RAS contains information on cross-sections, hydraulic structures, river banks and other physical attributes of river channels. The pre-processing using HEC-GeoRAS involves creating these attributes in GIS, and then exporting them to the HEC-RAS geometry file.
Tags : model execution, feature classes, 3d analyst, arcmap document, aerial photograph, seven tools, hydraulic modeling, spatial analyst, hec georas, mxd, terrain data, gis data, post processing, levee, small portion
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