hecrasmodel.blogspot.com
The RAS Solution: Lifting Terrain in HEC-RAS 5.0
http://hecrasmodel.blogspot.com/2015/06/lifting-terrain-in-hec-ras-50.html
Thursday, June 25, 2015. Lifting Terrain in HEC-RAS 5.0. Written by Gerrit Kiers VIZITERV Consult Kft., Hungary. Using Cross Section Data to add a levee. For the definition of the levee I created a new geometry file and in this geometry I drew a river reach (Muncie levee) just on top of the break lines. Constructing the cross section data for the new levee is rather straightforward. In this example I created the levee on a fixed elevation of 950 ft. There is no need to extend the side-slopes so t...With ...
hecrasmodel.blogspot.com
The RAS Solution: Including Channel Bathymetry into your Terrain.
http://hecrasmodel.blogspot.com/2014/12/including-channel-bathymetry-into-your.html
Monday, December 8, 2014. Including Channel Bathymetry into your Terrain. Written by Christopher Goodell, P.E., D.WRE WEST Consultants. Let’s say you have a digital terrain model of the area you want to model with 2D HEC-RAS. ONLY. To adequately model 2D in RAS,. You need a terrain of your entire modeled area-including the stream channels. HEC has come up with an easy way to weave in a channel terrain with your LiDAR terrain, IF you already have cross sections of the channel. 3 Once you’ve added th...
hecrasmodel.blogspot.com
The RAS Solution: Using User-Defined Curves for Gates
http://hecrasmodel.blogspot.com/2015/07/using-user-defined-curves-for-gates.html
Friday, July 31, 2015. Using User-Defined Curves for Gates. Written by Christopher Goodell, P.E., D.WRE WEST Consultants. After entering the User Defined Gate Performance Curves window for the first time, you’ll notice that you must click on the “New” button. To start a new set of curves. Click New, then enter a name for the curves set. Press the Plot… button just to make sure that the curves look correct. Now you’re ready to compute. August 4, 2015 at 8:05 AM. Very useful. Thanks Chris. In the first col...
hecrasmodel.blogspot.com
The RAS Solution: Book
http://hecrasmodel.blogspot.com/p/book.html
Breaking the HEC-RAS Code. By Christopher Goodell, P.E., D.WRE. One of the most powerful, yet relatively unknown. Features available in HEC-RAS is. Has a wealth of procedures. A programmer to manipulate HEC-RAS externally by setting input data, retrieving input or output data, and performing common functions such as opening and closing HEC-RAS, changing plans, running HEC-RAS, and plotting output. Seemingly endless. Not only can. Retrieval and post-processing of. Output be automated,. Improve your course...
hecrasmodel.blogspot.com
The RAS Solution: My Unsteady HEC-RAS Model is Unstable…Why?
http://hecrasmodel.blogspot.com/2015/05/my-unsteady-hec-ras-model-is-unstablewhy.html
Tuesday, May 19, 2015. My Unsteady HEC-RAS Model is Unstable…Why? Written by Christopher Goodell, P.E., D.WRE WEST Consultants. 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. If I could sum up my approach to troubleshooting unsteady HEC-RAS models in one sentence, it would be. Parti...
hecrasmodel.blogspot.com
The RAS Solution: Downstream Boundary-Normal Depth?
http://hecrasmodel.blogspot.com/2010/01/downstream-boundary-normal-depth.html
Monday, January 4, 2010. Written by Chris Goodell, P.E., D. WRE WEST Consultants. Measure the average bed slope of your stream in the profile plot. You can do this by holding the ctrl key and drawing a line to represent the average slope as shown above. The pop-up window gives you a dy/dx term, which is the slope. Use a USGS Quad map or other contour file or terrain model of the reach. Of your modeled reach. Measure the distance between the first two contour lines that cross the your stream. Move the dow...
hecrasmodel.blogspot.com
The RAS Solution: New HEC-RAS 2D Modeling User’s Manual
http://hecrasmodel.blogspot.com/2015/05/new-hec-ras-2d-modeling-users-manual.html
Wednesday, May 6, 2015. New HEC-RAS 2D Modeling User’s Manual. In advance of the final release of Version 5.0 (hoping for this summer), HEC has released its 2D Modeling User’s Manual. If you plan to run a 2D or combined 1D/2D model in HEC-RAS, please read this manual. Mr. Brunner has done a fantastic job putting together this very well-written document with easy-to-understand instructions and guidance for setting up and running a 2D or combined 1D/2D model in HEC-RAS. An excerpt from the Introduction:.
hecrasmodel.blogspot.com
The RAS Solution: The Projection File
http://hecrasmodel.blogspot.com/2015/05/the-projection-file.html
Thursday, May 14, 2015. Written by Christopher Goodell, P.E., D.WRE WEST Consultants. 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 front-end interface for HEC-RAS, replacing the iconic “Main RAS Window”. 1 Geographic Coordinate ...
hecrasmodel.blogspot.com
The RAS Solution: How to draw cross sections.
http://hecrasmodel.blogspot.com/2012/07/how-to-draw-cross-sections.html
Tuesday, July 31, 2012. How to draw cross sections. Written by Chris Goodell, P.E., D. WRE WEST Consultants. It takes a little bit of practice to do this correctly, and most of the time some trial and error, but as long as you remain perpendicular to the flow lines and don’t intersect, you’ll have a good set of cross sections. February 13, 2013 at 1:36 AM. Do the cross sections always have to begin at the same point on a line? If this start point varies how does HEC-RAS know how the channel meanders?
hecrasmodel.blogspot.com
The RAS Solution: Problems with bridges and culverts.
http://hecrasmodel.blogspot.com/2009/08/problems-with-bridges-and-culverts.html
Monday, August 3, 2009. Problems with bridges and culverts. Written by Chris Goodell, P.E., D. WRE WEST Consultants. Thanks Eric for the topic). It's very common for HEC-RAS models to show inconsistencies around crossings (bridges and culverts). Usually, 1 of 3 things is going on here: 1. Bad geometry-either incorrectly entered, or poorly defined. 2. Numerical errors. 3. The results are actually correct and can be explained. Take the following example, in the figure below. August 4, 2009 at 10:08 AM.
