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PT / Português2D Conveyance Obstructions
Conveyance obstructions can be assigned to the 2D mesh to account for regions that are permanently blocked from conveying flow....
Working with a HEC-RAS Project
75 Articles2D Flow Area Connection Issues
A flow area connection can be used to model a hydraulic structure between two adjacent storage areas, a storage area...
2D Ineffective Flow Areas
Ineffective flow areas can be assigned to the 2D mesh to account for regions where the water is not actively...
Adding a Base Map Layer
A base map layer provides high-quality background aerial and other imagery from different online map providers to add context to...
Adding an AutoCAD Drawing
This video details how to add and georeference an AutoCAD drawing file for a HEC‑RAS model. There are two ways of...
Adjust Elevations command
The Adjust Elevations command is used to set or adjust elevations for a portion of an existing elevation grid. The user...
Assign Cross Sections command
The Assign Cross Sections command is used to select an existing polyline on the Map View, assign it as a...
Assign Multiple Cross Sections command
The Assign Multiple Cross Sections command enables the user to select a group of existing polylines on the Map View...
Assign River Reaches command
The Assign River Reaches command enables the user to quickly assign a polyline as a river reach. Follow these steps...
Attribute Table command
GeoHECRAS allows the user to easily review and edit GIS attribute data using the Attribute Table command. The Attribute Table...
AutoCAD Drawing as Terrain Elevation Data
AutoCAD drawing files can be used as a terrain elevation data source in the following formats: Contour lines Elevation points...
Automated Draw Cross Sections command
The Input | Cross Sections | Automated Draw Cross Sections command causes the software to automatically create cross sections along a river...
Bridge Design Location Considerations
A poor bridge location makes it susceptible to damage and a host of other problems. Therefore, the location for a...
Common HEC‑RAS Workflows
GeoHECRAS can perform the following HEC‑RAS workflows: Floodplain Analysis and Mapping Floodplain Encroachment Studies Roadway Crossing (Bridge & Culvert) Design...
Construct 3D Buildings from OSM Data
GeoHECRAS software uses OpenStreetMap (OSM) data to construct 3D buildings on the Map View. The Show 3D Buildings command will...
Copying and Pasting Model Elements
The software allows you to copy and paste model elements within a project and even between projects when two or...
Copying HEC‑RAS Entities from one Project to Another
The software allows you to copy and paste model elements between projects. For example, select a cross section from one...
Creating Cross Sections from Terrain Elevation Data
GeoHECRAS provides numerous methods for creating cross sections from terrain elevation data. The following commands are provided for creating cross...
Crop Base Map command
The Crop Base Map command crops the base map (i.e., Google Map, Bing Map, etc.) to the elevation terrain data...
Defining HEC-RAS Storage Areas
Upstream and downstream boundaries of a river reach can be connected to a reservoir, lake, or other types of large...
Digitizing Elements
Digitizing (or drawing) elements on the Map View can be performed using the various HEC‑RAS specific commands (e.g., Draw River...
Draw Cross Sections command
Cross sections are located at intervals along a stream for characterizing flow carrying capability of the stream and the adjacent...
Draw Cross Sections Command Shortcut (Ctrl+D Keypress)
The Draw Cross Sections Command shortcut (Ctrl+D Keypress) allows the user to draw the cross sections directly on the Map...
Draw River Reaches command
The Input | River Reaches | Draw River Reaches command enables the user to quickly draw a river reach on the Map View....
Editing of River Names and Reach Names
The user can rename a river and/or reach by double clicking on the reach name on the Map View. There...
Export HEC‑RAS to Shapefiles command
It is quite easy to export a HEC‑RAS model to GIS shapefiles, allowing the HEC‑RAS model data to be shared...
Exporting a HEC‑RAS Model to Google Earth
It is quite easy to export a HEC‑RAS model to Google Earth, allowing the HEC‑RAS model data to be viewed...
External editing of HEC‑RAS models
Often users will export a HEC‑RAS model from GeoHECRAS for project submission. During the process, changes might be made to...
Extract Cross Section Geometry command
The Extract Cross Section Geometry command can extract the cross section geometry from an underlying elevation grid where there is...
Flow Roughness Change Factors command
The Flow Roughness Change Factors command allows the user to adjust roughness coefficients with changes in flow. It enables the user...
Generate Contours command
The Generate Contours command creates equally spaced contour lines from loaded elevation grid data. The user can specify major and...
Generate Terrain command
Digital terrain surfaces can be used for the following tasks: Extracting cross section geometry Computing 2D flow areas Determining bank...
Georeferencing a HEC‑RAS Model to a Map Location
When importing a HEC‑RAS model, the imported model will be assigned to a local coordinate reference system. If the project...
Georeferencing a HEC‑RAS Model to a River Alignment
This video tutorial shows you how to georeference a non-georeferenced HEC‑RAS model to a river alignment in real-world coordinates using...
HEC-RAS 2D Analysis Error – Weir Stationing Not Increasing
When performing a 2D HEC-RAS analysis that contains storage areas and 2D connections, the HEC-RAS program might report the following...
HEC-RAS 2D Bridge Modeling
When working with bridges with complex geometry, modeling the hydraulics in 2D provides a clearer understanding and a more accurate...
HEC-RAS Bridge Modeling
HEC-RAS can be used to model roadway crossings, which can consist of single or multiple bridge openings and culverts. This...
HEC-RAS Bridge Modeling of Floating Debris
Floating debris, such as tree limbs, logs, roots, brush, and other material, can get caught on the upstream side of...
HEC-RAS Flood Result Raster Grids
While GeoHECRAS constructs a flood map representing the area of inundation, it can simultaneously generate an elevation raster grid (or...
HEC-RAS Ineffective Flow Areas
Ineffective flow areas allow the user to define areas of the cross section that will contain water that are not actively being...
HEC-RAS Minor Loss Coefficients
Minor losses represent sources of energy depletion along a river reach that are not related to friction loss. For example,...
HEC‑RAS Contraction & Expansion Losses
Losses due to contraction and expansion of flow between cross sections are determined during the HEC‑RAS standard step profile calculations....
HEC‑RAS Conveyance Obstructions
Conveyance obstructions allow the user to define areas at a cross section that are permanently blocked from conveying flow. Conveyance obstructions...
HEC‑RAS Cross Section Plot Options
The HEC‑RAS cross section plots can be customized for specific requirements, as described below. Custom Labels The labels used in the...
HEC‑RAS Element Display Properties
The software allows the user to change the display properties of the following HEC‑RAS elements shown on the Map View: River...
HEC‑RAS Modeling Best Practices
The following best practices should be used when defining, analyzing, and reviewing a HEC‑RAS model: The model results should be...
HEC‑RAS Output Cross Section Plots
The software can generate cross section plots of the HEC‑RAS steady flow and unsteady flow computational results, displaying the water...
HEC‑RAS Output Water Surface Profile Plots
The software can generate profile plots (sometimes called long sections or longitudinal profiles) of the HEC‑RAS steady flow and unsteady flow...
HEC‑RAS Profile Plot Options
The HEC‑RAS profile plots can be customized for specific requirements, as described below. Cross Section Landmarks The defined cross sections...
How to Add a GIS Shapefile to a HEC-RAS Model?
This video details how to add a GIS shapefile for a HEC‑RAS model. Follow these steps to add a GIS shapefile to a...
