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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....
HEC-RAS Data
58 Articles2D Ineffective Flow Areas
Ineffective flow areas can be assigned to the 2D mesh to account for regions where the water is not actively...
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...
Assigning Survey Data to HEC‑RAS Cross Sections
LiDAR has become an established method for collecting very dense and accurate elevation data across landscapes, shallow-water areas, and project sites....
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...
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...
Creating HEC‑RAS Cross Sections from Elevation Grids
Elevation grids, sometimes called DEMs (digital elevation models), are commonly used to represent ground terrain surfaces. Elevation grids use a...
Culvert Design Considerations
The structural choice of a culvert and corresponding inlet is based on environmental considerations, risk to property, cost of construction...
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...
Defining HEC‑RAS Culverts for Fish Passage
This article discusses defining HEC‑RAS culverts for fish passage, by defining multiple roughness regions and partially-buried culverts. Multiple Roughness Regions...
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 Draw River Reaches command enables the user to draw a river reach on the Map View. From the Input...
Editing of River and Reach Names
GeoHECRAS allows the user to rename a river and/or reach by double clicking on the reach name on the Map...
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...
FEMA Flood Data command
The software can display the FEMA digital Flood Insurance Rate Map (FIRM) directly on the Map View. It is required...
FEMA NFHL Download command
GeoHECRAS allows the user to download FEMA National Flood Hazard Layer (NFHL) as shapefile data by using the FEMA Flood...
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...
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 Bridge High Flow Computations
HEC‑RAS has the ability to compute high flows (flows that come into contact with the highest point of the bridge...
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 Geometry Requirements
This article discusses the requirements for HEC‑RAS cross section placement, spacing, layout, geometry, and other data. Boundary geometry for the...
HEC‑RAS Culvert Cross Section Locations
The culvert computational routines in HEC‑RAS require the same four cross sections as the bridge computational routines. These cross sections include:...
HEC‑RAS Culvert Hydraulics Concepts
This article introduces the basic concepts of culvert hydraulics, which are used in the HEC‑RAS culvert computational routines. A culvert is a...
HEC‑RAS Culvert Types/Shapes & Dimensions
This article describes the various culvert types/shapes, sizes, and dimensions that HEC‑RAS supports. Culvert Types HEC‑RAS has the ability to...
HEC‑RAS Element Display Properties
You can change the display properties of the following HEC-RAS elements shown on the Map View: River Reaches Cross Sections...
How to Define Levees in HEC-RAS?
HEC‑RAS allows the user to define levees to constrain the flow to the main channel by defining a left and/or right...
How to Export a HEC-RAS Model?
GeoHECRAS is a data wrapper to the HEC‑RAS software. It is quite easy to export the HEC‑RAS model that the...
How to Export a HEC‑RAS Model to AutoCAD or MicroStation?
It is quite easy to export a HEC‑RAS model to an AutoCAD or MicroStation drawing file, allowing the HEC‑RAS model...
How to Import a HEC-RAS Model?
GeoHECRAS is a data wrapper to the HEC‑RAS software. It is quite easy to import any existing HEC‑RAS model. Follow these...
Import Cross Section Geometry command
The Import Cross Section Geometry command is used to import surveyed cross section geometry from a wide variety of file...
Import River Reach Geometry command
The Import River Reach Geometry command allows the software to import surveyed river reach geometry from a wide variety of...
Interpolate Cross Sections command
The Interpolate Cross Sections command can be used to automatically add interpolated cross sections to a river reach. The interpolated cross...
Interpolate Geometry command
The Interpolate Geometry command allows the user to interpolate the 3D river geometry from the defined HEC-RAS cross sections and the...
Modified Puls Routing
For unsteady flow models, the HEC‑RAS Modified Puls Routing option can be used to define portions of a river reach that...
Pump Station Data command
Pump stations are used to pump water from one location to another. In GeoHECRAS, the Pump Station Data command allows...
Restoring a Map View Coordinate Reference System
After importing data that does not have an assigned coordinate reference system (CRS), the data will be displayed in its...
Reverse River Reach command
The river flow direction is defined by digitizing the river reach in a downstream direction. The software will display a...
Rivers and Streams command
The Rivers & Streams command displays the National Hydrograph Dataset (NHD) from the USGS web map service, showing river and...
