HEC-RAS Model Troubleshooting Archives - Knowledge Base on CivilGEO

2D Flow Area Connection Issues

A flow area connection can be used to model a hydraulic structure between two adjacent storage areas, a storage area...

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...

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...

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 Mesh Generation Errors & Corrections

Creating a HEC-RAS 2D mesh that correctly represents the flow area being modelled can take some time to add the...

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 Analysis Base Engine Troubleshooting

This article describes how to fix the HEC‑RAS base engine if you cannot get the HEC‑RAS analysis to run. When GeoHECRAS performs...

HEC‑RAS Bridge Low Flow Computations

The HEC‑RAS bridge computations allow the modeler to analyze a bridge using several different methods without changing the bridge geometry. The...

HEC‑RAS Culvert Expansion & Contraction Coefficients

User‑defined coefficients are required to compute head losses due to the contraction and expansion of flows upstream and downstream of...

HEC‑RAS Horizontal and Adverse Culvert Slopes

The HEC‑RAS culvert routines allow for horizontal and adverse culvert slopes. The primary difference is that normal depth is not...

HEC‑RAS Import Base Engine Troubleshooting

This article describes how to fix the HEC‑RAS base engine if you cannot get a HEC‑RAS model imported. When GeoHECRAS imports a...

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...

Modeling HEC‑RAS Multiple Bridge Openings as Divided Flow

Multiple Opening Bridge Computational Limitations The HEC‑RAS multiple opening computational method is a one‑dimensional flow approach to a complex hydraulic problem....

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...

Selecting HEC-RAS Analysis Engine Version

GeoHECRAS allows the user to select which HEC-RAS version should be used for the analysis computations. The user can select...

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...

Undo and Redo Commands

The Undo and Redo commands are complimentary and can be quite helpful when working on an engineering project. The important...

Unsteady Flow HEC‑RAS Model Troubleshooting

The following sections describe various issues that should be considered when troubleshooting an unsteady flow HEC‑RAS model. Time Step Issues Model...