Introductory HEC-RAS Course – In Person!
Registration is open for this Sept 27-29 in-person Introduction to HEC-RAS Course.
Lateral Structure on River Bends
Lateral structures can be used in HEC-RAS for transferring flow from a river/reach to another river/reach, 2D area or storage area. This allows the user to physically represent a variety of geometric features. In this example, lateral structures were used to capture flow overtopping high ground on the spine of a sharp river bend in […]
Steady Unsteady? 1D, 2D, 3D? Modeler Application Guidance
Hey RAS Users. HEC just put out this very informative document that helps and guides the modeler with the decision between building a steady versus unsteady model, as well as when to go with a 1D, 2D, or 3D model. Modeler Application Guidance for Steady vs Unsteady, and 1D vs 2D vs 3D Hydraulic Modeling. […]
Preview of the new Finite-Volume Approach for 1D Reaches
One of the most anticipated new features soon to come in the next major version of HEC-RAS (Version 5.1) is the option of running unsteady 1D reaches with a finite volume solution scheme. This will be a fantastic addition to HEC-RAS. Gary Brunner recently gave me a brief overview of the new finite volume feature […]
Using a HEC-RAS Storage Area and Lateral Structures to Replace Standard Reach Junctions
Situation: Advances in HEC-RAS now allow for improved simulation of overbanks using 2D Flow Areas. Coupled 1D/2D models where 1D cross-sections represent the bank-to-bank cross-section data and 2D flow areas represent overbank areas has greatly improved the accuracy and robustness of HEC-RAS models. This is particularly the case in flat, urban areas with significant overbank […]
1D? 2D? or 1D/2D? How Should I Build my Model?
Now that the official release of HEC-RAS 5.0 is out with 2D capabilities, I’m getting a lot of questions about whether 1D or 2D (or 1D/2D combined) is the best way to set up a specific model. The answer is very simple. Like everything else…It depends! Fortunately, there are some guidelines. 1. The general […]