The 2D HEC-RAS class is a GO! Who wants some HEC-RAS 2D Modelling training? This will be a fantastic opportunity to learn how to set up and run 2D and 1D/2D HEC-RAS models. Mr. Krey Price and I will be hosting this course in Melbourne, Australia on April 5, 6, and 7th. Please go here for […]
In case you haven’t seen it, there has been a very popular LinkedIn discussion on the Hydraulic/Hydrologic Modeler’s Forum debating the advantages, disadvantages, and merits of HEC-RAS 5.0, TUFLOW, and DHI’s MIKE21. There was a lot of great information (and some misinformation) and insight provided in that thread. It is well worth the read. Some […]
Here’s a video of pressure and weir flow yesterday at a bridge near my house. This was brought on by some very intense rainfall over a short period of time. What do you think the weir coefficient would be? ‘Tis the season in many parts of the world for heavy rains and high water. This […]
Well it’s been one year since I published “Breaking the HEC-RAS Code”. It was a lot of work, but I am very pleased to see how many people are making use of the book controlling and automating HEC-RAS with their own codes. For those of you who haven’t discovered it yet, this book introduces […]
The following article written by Mr. David Markwood of AECOM provides an excellent summary of the latest beta (candidate) version of HEC-RAS 5.0. Well worth the read! https://www.linkedin.com/pulse/hec-ras-50-beta-update-david-r-markwood-pe
*Update: Version 5.0.2 now does flow transects in RAS Mapper with profile lines. No longer necessary to use a 2D Area Connection to do this. A very common output request in 2D modeling is for flow over (through) a transect line. HEC-RAS 5.0 does not have a specific tool for extracting flow data along a […]
Suppose you have two separate HEC-RAS rivers and wish to combine them. There is no “combine two rivers” option in HEC-RAS, but it can be done using the Move Points/Objects option. Take the very simple reach presented below: I wish to combine the Upper Tualatin with the Clackamas reach of the Willamette River. In the […]
HEC-RAS allows for four different gate types that will compute the stage-discharge relationship of that gate for you based on the physical size/shape of the gate and a few empirical coefficients: Sluice Gates, Radial Gates, Overflow Gates (closed top) and Overflow Gates (open air). However, sometimes the built-in gate types don’t quite fit the gate […]
If you are a Windows 8 user and you are having trouble getting HEC-RAS Version 5.0 beta to work, Window’s Program Compatibility Troubleshooter may solve the problem. Problems usually arise when pressing the compute button. One common message that pops up is “Error starting process. Steady file not found.” The Program Compatibility Troubleshooter will fix […]
This question (or some variation of it) comes up quite a bit on The RAS Solution: “I have an unsteady flow model. When I run it, it goes completely unstable. What is causing this?” Many times a screen shot of the computation window with the dreaded “red bar” is attached. While the person asking the […]
RAS Mapper is a window in HEC-RAS that allows you to preprocess 2D areas, map results, and manage background images. In future versions of HEC-RAS, RAS Mapper will become more and more prevalent in our HEC-RAS modeling experience. As I understand it, eventually RAS Mapper and the geometry editor window may merge to form the […]
In advance of the final release of Version 5.0 (hoping for this summer), HEC has released its 2D Modeling User’s Manual, written by Gary Brunner, the HEC-RAS Team Leader. This manual contains updates to all of the information that was put out in the previous guidance document, “Combined 1D and 2D Modeling using HEC-RAS” as […]