GeoSTORM GeoHECRAS GeoHECHMS Customer Stories Knowledge Base Product Tutorials Engineering Resources

Customer Reviews Customer Stories Customer Videos Case Studies Wall of Love Products Knowledge Base Product Tutorials

Training Classes Training Webinars Product Tutorials Products Knowledge Base About Us

Get Support Knowledge Base Feature Requests Engineering Resources Products Customer Stories About Us

About Us Privacy Center News Blog Products Customer Stories Knowledge Base

← All GeoHECRAS

Getting Started & Project Workflow

GeoHECRAS Overview & Comparisons

How does GeoHECRAS compare to Competitors?
How is GeoHECRAS different than HEC‑GeoRAS?
How is GeoHECRAS different than Civil 3D River and Flood Analysis?
How is GeoHECRAS different than HEC‑RAS?

Common Workflows

Common HEC‑RAS Workflows

Project Setup & Georeferencing

Georeferencing a HEC‑RAS Model to a River Alignment
Georeferencing a HEC‑RAS Model to a Map Location

Importing / Exporting Models

Exporting Your Project to HEC-RAS
Import HEC-RAS Shapefile Geometry Command
Importing a HEC-2 Model in HEC-RAS
HEC‑RAS Import Base Engine Troubleshooting
External Editing of HEC‑RAS Models
Importing a HEC-RAS Model

Scenarios & Plans

Global Copy Command (GeoHECRAS)
Multiple Plan Analysis (HEC-RAS)
Scenario Summary (HEC-RAS)
Delete Scenarios (HEC-RAS)
Duplicate Current Scenario (HEC-RAS)
Understanding HEC-RAS Scenarios
Running HEC‑RAS Batch Analyses

Display & Element Properties

HEC‑RAS Element Display Properties

River System Geometry

River Reaches

Georeferencing River Reaches
Automated Draw River Reaches Command
Editing of River and Reach Names
Import River Reach Geometry Command
Reverse River Reach Command
Assign River Reaches Command
Draw River Reaches Command

River Junctions

Draw and Assign River Junctions Command
River Junction Data Command

Flow Lengths

Edit Flow Lengths Command
Assign Flow Lengths Command

River Stations

Edit River Stations, Node Names & Descriptions Command

Channel Modification & Stream Restoration

River Channel Modification Command
Stream Restoration & Channel Stabilization Modeling using HEC-RAS

Cross Sections

Creation & Drawing

Draw Cross Sections Command Shortcut (Ctrl+D Keypress)
Assigning Survey Data to Cross Sections
Automated Draw Cross Sections Command (HEC-RAS)
Draw Cross Sections Command
Assign Multiple Cross Sections Command
Assign Cross Sections Command
Creating Cross Sections from Terrain Elevation Data

Editing & Interpolation

Reverse Cross Section Geometry Command
Geometry Comparison
Geometry Point Reduction
Interpolate Cross Sections Command
Export Cross Sections to CAD Command
Interpolate Geometry Command
Extract Cross Section Geometry Command
Import Cross Section Geometry Command

Properties & Geometry Requirements

HEC-RAS Cross Sections
Georeferencing HEC-RAS Cross Sections
Hydraulic Parameters – Cross Sections Command
Cross Section Lids
HEC‑RAS Cross Section Geometry Requirements

Banks & Bank Stations

Bank Station Placement
Assign Channel Banks Command

Manning's Roughness & Land Cover

Assign Manning's Data (HEC-RAS)
Create and Assign Land Cover Data as Manning’s Roughness
Flow Roughness Change Factors Command

Contraction & Expansion

HEC‑RAS Contraction & Expansion Losses
Editing of Contraction and Expansion Coefficients

Ineffective Flow & Conveyance Obstructions

HEC-RAS Minor Loss Coefficients
HEC-RAS Ineffective Flow Areas
HEC‑RAS Conveyance Obstructions

Bridges

Bridge Overview & Setup

HEC-RAS Bridge Modeling
HEC-RAS Bridge Rail Modeling Guidelines
Bridge Design Location Considerations

Bridge Geometry & Parameters

Defining Bridge Modeling Approach for HEC-RAS Bridge Modeling
Defining Internal Geometry for HEC-RAS Bridge Modeling
Defining Build Bridge Opening for HEC-RAS Bridge Modeling
Defining WSPRO Parameters for HEC-RAS Bridge Modeling
Defining Bridge Parameters for HEC-RAS Bridge Modeling
Defining Deck Roadway Geometry for HEC-RAS Bridge Modeling

Bridge Hydraulic Computations

HEC‑RAS Bridge Low Flow Computations
HEC‑RAS Bridge High Flow Computations

Multiple Openings & Divided Flow

Defining Multiple Openings for HEC-RAS Bridge Modeling
Modeling HEC‑RAS Multiple Bridge Openings as Divided Flow

Skewed Bridges

Modeling Skewed Bridges

Bridge Scour & Floating Debris

Bridge Scour Modeling
HEC-RAS Bridge Modeling of Floating Debris

Bridge Output & Parameters

Defining Profile Results for HEC-RAS Bridge Modeling
Hydraulic Parameters - Bridges & Culverts Command
Export Table from Bridge Opening Comparison

Culverts

Culvert Definition & Types

Culvert Chart and Scale Number
HEC‑RAS Culvert Types/Shapes & Dimensions
Culvert Modeling
Defining Culverts for HEC-RAS Bridge Modeling
Defining HEC‑RAS Culverts for Fish Passage

Culvert Design Considerations

Culvert Design Considerations
HEC‑RAS Horizontal and Adverse Culvert Slopes
HEC‑RAS Culvert Cross Section Locations

Culvert Hydraulics & Computations

Setting Maximum Headwater Parameter
HEC-RAS Culvert and Roadway Overflow Computations
HEC‑RAS Culvert Supercritical & Mixed Flow Computations
HEC‑RAS Culvert Expansion & Contraction Coefficients
HEC-RAS Culvert Normal Depth Computations
HEC‑RAS Culvert Hydraulics Concepts
HEC‑RAS Culvert FHWA Full Flow Computations
HEC‑RAS Culvert Direct Step Computations

Roadway Crossings

Roadway Geometry

Graphically Editing Roadway Geometry
Import Roadway Geometry Command
Extract Roadway Geometry Command
Draw and Assign Roadway Crossings Command

Roadway Management & Georeferencing

Delete Roadway Crossings Command
Georeferencing Roadway Crossings

Hydraulic Structures

Inline Structures (Weirs/Spillways)

Georeferencing Inline Structures
Extract Weir Crest Geometry Command
Stepped Spillway Discharge Coefficient
Inline Structure Data Command
Draw and Assign Inline Structures Command
Inline Structure Gated Spillway Hydraulic Computations

Lateral Structures

Connecting River to Off-Channel Storage Area Using Lateral Structure
Troubleshooting of Lateral Structures Modeling
Lateral Structure Data Command
Draw and Assign Lateral Structures Command

Storage Areas

Storage Area Data Command (HEC-RAS)
Automated Draw Storage Areas Command
Georeferencing Storage Areas
Extracting Storage Area Volume Curve
Defining HEC-RAS Storage Areas

SA/2D Connections

Reverse SA/2D Connection Geometry Command
SA/2D Connection Data Command
Hydraulic Parameters - Storage Area Connections Command
Draw and Assign SA/2D Connections Command
2D Flow Area Connection Issues

Levees

Levee Breach Modeling
Defining Levees in HEC-RAS

Pump Stations

Pump Station Modeling
Pump Station Data Command

Gates

Elevation Controlled Gates

Flow Training Structures & Pilot Channels

Pilot Channels Command
2D Flow Training Structures Command

2D Modeling

2D Domain & Flow Area

Defining 2D Model Domain
2D Flow Area Data Command
2D HEC-RAS Modeling Recommendations
Draw and Assign 2D Flow Areas Command
HEC-RAS 2D Flow Area Modeling

Mesh Generation & Zones

Draw and Assign 2D Flow Area Breaklines
Delete 2D Mesh Zones
Draw and Assign 2D Mesh Zones Command
HEC-RAS 2D Mesh Generation Errors & Corrections

2D Roughness & Land Cover

Edit 2D Roughness Regions Command
Draw and Assign 2D Roughness Regions Command
Edit 2D Land Cover Data Command

2D Obstructions & Ineffective Areas

2D Ineffective Flow Areas
2D Conveyance Obstructions

2D Boundary & Initial Conditions

Draw and Assign SA/2D Initial Condition Points Command
Initial Flow and Stage Conditions
Initial Conditions Flow Optimizations
Draw and Assign SA/2D Boundary Condition Lines Command

1D-2D Coupling

Connecting 2D Flow Areas to 1D Hydraulic Elements

2D Analysis Tools

2D Floodplain Encroachments Command
2D Profile Lines

2D Bridge Modeling

HEC-RAS 2D Bridge Modeling

2D Computational Theory

HEC-RAS 2D Grid & Subgrid Computations
HEC-RAS 2D Computational Equations Comparison

2D Troubleshooting

Troubleshooting 2D Fragmented Inundation
HEC-RAS 2D Analysis Error – Weir Stationing Not Increasing

Flow Data & Boundary Conditions

Steady Flow Data

Steady Flow Data Command
Steady Flow Calibration Command
Import Steady Flow Data Command

Unsteady Flow Data

Unsteady Flow Data Command

Boundary Conditions

Boundary Conditions

Flow Optimizations

Flow Optimizations Command

Lateral Flow Modeling

Modeling Lateral Flows

Rainfall, Infiltration & Hydrology

Rainfall Data

Rain Gage Data Command (GeoHECRAS)
Lookup Rainfall Command (GeoHECRAS)
Rainfall Distribution

Soils & Infiltration

Infiltration Grid Properties
Compute Infiltration Command
Create Soils Layer Command

Specialty Flow

Non-Newtonian Flow Options

External Hydrology Integration

Meteorology Map Command
Evapotranspiration Gage Data Command

Computational Options & Engine Analysis

Steady Flow Computations

Compute Steady - Current Scenario Command
Steady Flow Computational Options Command

Unsteady Flow Computations

Compute Unsteady - Current Scenario Command
Restart Options
Advanced Time Step Control
Unsteady Flow Computational Options

2D Flow Options

2D Flow Options

Computational Theory

Computational Differences Between HEC‑RAS and HEC‑2
Flow Distribution Calculations with HEC-RAS
Modified Puls Routing

Dam Break Analysis

Dam Break Analysis
Viewing Breach Time Series Plots
Entering Dam Break Data

Performance & Parallelization

Parallelization and CPU Affinity in GeoHECRAS
Selecting HEC-RAS Analysis Engine Version

Floodplain Mapping & Encroachments

Steady Flow Encroachments

Assign Floodway Stations Command
Floodplain Encroachments Command

Unsteady Flow Encroachments

Unsteady Flow Floodplain Encroachments Command

Flood Map Generation

Flood Map Command
Flood Map Contours
HEC-RAS Flood Result Raster Grids

Floodway Map Settings

Floodway Map Settings Command

Velocity Mapping

Horizontal Velocity Mapping Command

Sediment & Specialty Analysis

Sediment Transport

Fixed Sediment Elevations Command

Shear Stress Diagnostics

Troubleshooting Shear Stress Results

Output, Reporting & Visualization

Cross Section Plots

HEC‑RAS Cross Section Plot Options

Profile Plots

HEC‑RAS Profile Plot Options
HEC‑RAS Output Water Surface Profile Plots

Hydrographs & Time Series

Time Series Nodes
Viewing Stage and Flow Hydrographs

Tabular & Detailed Output

Detailed Output

Troubleshooting & Best Practices

General Modeling Problems

Fixing HEC-RAS Modeling Problems

Engine/Import Errors

HEC-RAS Engine Loading Error
HEC-RAS File Name and Directory Path Issues
HEC‑RAS Analysis Base Engine Troubleshooting

Unsteady Flow Issues

Unsteady Flow HEC‑RAS Model Troubleshooting

Best Practices

HEC‑RAS Modeling Best Practices

Platform & GIS Tools

Map View & Navigation

Coordinate Reference Systems

Spatial Reference
Google Mercator Coordinate Reference System
Custom Coordinate Reference Systems
Local Coordinate Reference Systems
Supported Coordinate Reference Systems

Base Maps & Aerial Imagery

Layer Management

Raster Image Layer Properties
Adding an Elevation Layer
Point Layer Properties
Add Layers Command
TIN Surface Properties
Creating a New Layer
Drawing Layer Properties
Elevation Grid Properties
External Map Layers Command
Layer Transformation
Reload Layer command
Layer Display Order

Drawing & Editing Tools

Copy & Paste Element Properties
Create Holes Command
Editing Element IDs & Descriptions
Trim Polylines Command
Merge Polylines Command
Extend Polylines Command
Deleting Project Elements
Rotating and Resizing Polyline and Polygon Elements
Polyline and Polygon Vertices Editing
Reshape Polyline Command
Explode Multipart Command
Build Polygons Command
Intersect Polygons Command
Detach Polygons Command
Detach Polylines Command
Split Polylines Command
Fill Holes Command
Selection Sets
Merge Polygons Command
Buffer Polylines Command
Buffer Polygons Command
Distribute Vertices Command
Offset Polyline Command
Split Polygons Command
Smooth Elements Command
Simplify Elements Command
Intersect Polylines Command
Stamp Multiple Command
Format Painter Command
Stamp Geometry Command
Digitizing Elements
Copying and Pasting Model Elements

GIS Data Import/Export

Exporting Your Project to AutoCAD or MicroStation
Automated GIS Mapping Functions
Exporting Your Project to Google Earth
GIS Shapefile Common Restrictions
GIS Element Properties
Export To Shapefile Command
Conflate Point Data Command
Supported External Data Formats
Attribute Table Command
Exporting Your Project to Shapefiles
Viewing and Editing GIS Attribute Data using Data Explorer

Terrain & Elevation Data

Elevation Profile Command
Terrain Elevation Geometry Sources
Download DEM Data Command
Add Survey Points Command
Grid Calculator Command
Adjust Elevations Command
Generate Contours Command
Merge DEMs Command
Working with LIDAR
ESRI TIN to Elevation Contour Shapefile
Convert Elevations Command
Importing MicroStation Terrain Surfaces
How to Convert ESRI TIN to Elevation Raster?
Importing an ESRI TIN elevation dataset
Generate Terrain Command
Surface Terrain 3D Vertical Exaggeration
AutoCAD Drawing as Terrain Elevation Data

External Data Sources

Soil Survey Data Download Command
Hydroshed Data Download Command
Hydrography Data Download Command
Hydroshed Data Command
Stream Gages Command
Hydrography Data Command
Wetlands Data Command
Watershed Flow Paths Command
Delineate Watershed Command
Compute Flow Paths Command
Contributing Streams Command
Automated Flow Paths Command
Draw and Assign Subbasins Command
USGS StreamStats Command
FEMA NFHL Download Command
FEMA Flood Data Command

Annotation & Symbology

CAD Properties
Annotation Mapping
Attribute Mapping
Photo Catalog

Project Management

Options Backstage Page - General Preferences
Options Backstage Page
Project Archiving
Running CivilGEO Software on Virtual Machines
Clear Cache Command
Record Video Command
Publish PDF Command
Publish Graphics Command

AI Assistant

Ask Simon - CivilGEO's AI Assistant

Keyboard Shortcuts

Keyboard and Mouse Shortcuts Listing
Customizing Keyboard Shortcuts

Land Use Tools

Land Use Data
Land Cover Command
Urban Impervious Command
Automated Land Use Command
Land Use Properties
Draw Land Use Command
Classify Land Use Command
Merge Land Use Command

Home › GeoHECRAS › Flow Data & Boundary Conditions

Flow Data & Boundary Conditions

Steady Flow Data

3 articles

Steady Flow Data Command
Steady Flow Calibration Command
Import Steady Flow Data Command

Unsteady Flow Data

1 article

Unsteady Flow Data Command

Boundary Conditions

1 article

Boundary Conditions

Flow Optimizations

1 article

Flow Optimizations Command

Lateral Flow Modeling

1 article

Modeling Lateral Flows

Products

Free Trial
GeoSTORM
GeoHECRAS
GeoHECHMS

Customers

Customer Portal Login
Customer Reviews
Customer Stories
Customer Videos
Case Studies
Wall of Love

Training

Training Classes
Training Webinars
Product Tutorials
Engineering Resources

Company

About Us
Contact
Privacy Center
Terms of Use
Brand Assets

Support

Knowledge Base
Contact Support
Feature Requests
General Feedback

Contact Us

info@civilgeo.com
+1 608-729-5100

CivilGEO United States

708 Heartland TrailSuite 3000Madison, WI 53717-2174Tel: 608-729-5100 or 800-488-4110

Copyright © 2026 CivilGEO, Inc. All rights reserved. The CivilGEO logo, “GeoSTORM”, “GeoHECHMS”, “GeoHECRAS”, and “Ready To Engineer” are registered trademarks of CivilGEO, Inc. All other brands, company names, product names or trademarks belong to their respective holders.