HEC-RAS Data

55 Articles

Detailed description of HEC-RAS input data and output results, along with tips to consider in constructing a HEC-RAS model.

2D Conveyance Obstructions

Conveyance obstructions can be assigned to the 2D mesh to account for regions that are permanently blocked from conveying flow....

2D Ineffective Flow Areas

Ineffective flow areas can be assigned to the 2D mesh to account for regions where the water is not actively...

Assign River Reaches command

The Assign River Reaches command enables the user to quickly assign a polyline as a river reach. Follow these steps...

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...

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....

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...

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 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 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 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...

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 River Reach Alignment command

The Input | Cross Sections | Import River Reach Alignment command allows the software to import surveyed river reach alignment from a wide...

Interpolate River Geometry command

The Interpolate River Geometry command allows the user to interpolate the 3D river geometry from the defined HEC-RAS cross sections...

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...

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...

Setting Model Units (US/Metric)

GeoHECRAS fully supports both Metric (SI) and US units. Default Project Units The software will auto detect the country that the...