Hec ras modelling
It may seem obvious to pick the lowest-hanging fruit on the troubleshooting tree by taking this approach, but if you try to solve things any other way and stop short of exiting the program entirely, you can spend hours troubleshooting errors that you’ll never actually be able to solve! …I’ve done that myself… and when I finally tried restarting HEC-RAS and my model ran just fine with no other changes, I felt a bit like this guy:įollowing are some capabilities I am hoping we will see in future releases to get past some of the current computational limitations: Re-run the plan.) This seems to solve 90% of the errors, which I assume is a cache issue if HEC-RAS could automatically clear the cache when plans are run, maybe some of these errors would disappear.
Hec ras modelling code#
Some errors, including certain versions of the 157 code error, simply can’t be resolved with changes to your model geometry, flow, or plan files. Sometimes after you open a different project without closing HEC-RAS first, your previous project will still be there when you open the geometry – This can be embarrassing if you open a project for a client, and their competitor’s project suddenly pops up on the screen! (WORKAROUND: Always close HEC-RAS completely before opening another project if you want to avoid this possibility!) (WORKAROUND: If you want to back up files or save a copy in which everything appears the same, you’ll need to copy and paste the entire folder, then delete what you don’t need.) If you use “save as” to make a backup copy or new version of your project, RAS Mapper generally won’t retain the projection or preserve terrain and land use associations.
![hec ras modelling hec ras modelling](https://i.ytimg.com/vi/BrLzvKASJXc/maxresdefault.jpg)
For some models, DV and DV 2 don’t display correctly at individual time steps in RAS Mapper – the max usually displays correctly, but values at individual time steps can far exceed the max, which shouldn’t be possible. (WORKAROUND: You can export depth and velocity as separate layers at any given time step and then create an output grid of the product of the two using third-party GIS applications remember, though, that the max D*V is usually NOT the product of the max D and the max V, so don’t multiply those layers!) (WORKAROUND: Fortunately this is another easy fix scroll to the “paperspace” paragraph here for the steps.)
Hec ras modelling update#
The idea behind this list is to provide workarounds or updates on fixes for course attendees wherever possible rather than serving as a complaint board so if you have figured out a way around one of the listed issues, please let me know how you’ve managed, and I’ll update this post.
![hec ras modelling hec ras modelling](https://www.sieker.de/fileadmin/sieker/Fachartikel/Hochwasser/HW-Modellierung/HEC-RAS_UEberflutungsflaeche_Panke_HQ50.png)
Sure, I’m just one user, but these are ranked by level of supplication or frustration based on input from hundreds of course attendees, so this particular list comes quite a bit of group consensus weight behind it! The RAS Solution Forum has existing threads for HEC-RAS bugs and suggestions, so there’s no need to post a comprehensive list of proposed fixes here, but I thought I’d list some of the items that come up most frequently during our HEC-RAS courses.
![hec ras modelling hec ras modelling](https://lh3.ggpht.com/-ArRQGXwm5p0/VLQiDVjZfwI/AAAAAAAAARE/j-qZb3pWcUs/image_thumb%25255B7%25255D.png)
Course attendees are consistently impressed with the user friendly functionality and how quickly they are able to create and animate a model from scratch that said, however, certain glitches and limitations are repeatedly mentioned as potential improvements for future releases.
![hec ras modelling hec ras modelling](https://ascelibrary.org/cms/asset/abe0fb20-2145-4163-8e35-c58148dd347f/figure5.gif)
We’ve had a tremendous response to the new features in HEC-RAS 5.0 in the courses we’ve held across Australia and New Zealand over the last year or two.