1D/2D Offline Connection Issues

Written by Chris Goodell | Kleinschmidt Associates Copyright © The RAS Solution.  All rights reserved.  I’ve mentioned this before, but I am thoroughly impressed with the robustness of the finite volume solution scheme used in 2D areas in HEC-RAS.  As long as your Courant Numbers are in a good spot, you rarely get errors and instabilities in […]

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Georeferencing hard copy or pdf maps

Using RAS Mapper as a GIS tool Part 3: Georeferencing hard copy or pdf maps Have you ever received your background data in hard copy or pdf format and wanted to view it in its georeferenced location? For this final topic in our three-part series on using RAS Mapper as a GIS tool, we’ll cover […]

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Shifting web imagery with world files for HEC-RAS

Using RAS Mapper as a GIS tool Part 2: Shifting Web Imagery with World Files Have you ever tried pulling web imagery into RAS Mapper only to find that it doesn’t line up with your existing shape files, terrain surfaces, or other geospatial data?  In this second of a three-part series on using RAS Mapper […]

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Removing bridge decks from terrain surfaces

Using RAS Mapper as a GIS Tool Part 1: Removing Bridge Decks from Terrain Surfaces This is the first in a three-part series on using RAS Mapper as a GIS tool. In this post we’ll cover the removal of bridge decks from terrain data. This topic comes up fairly frequently, since LiDAR data may be […]

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HEC-RAS Primer for New Users

Are you a new HEC-RAS user?  Or maybe you’ve used HEC-RAS before, but it’s been a while.  Maybe you have no idea where to start.  Steady or Unsteady?  1D or 2D?  Subcritical or Supercritical? OK, for all you Newbies out there, I’m going to walk you through some steps to take to get you up […]

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Getting Profile Output in a 2D Area

Back in September 2015, I wrote an article on how to extractflow data from a transect in a 2D area.   This was a round-about way of getting flow flux data out of RAS Mapper.  Back then the beta version of HEC-RAS 5.0 was somewhat limited in the ways data could be extracted from a 2D […]

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Post-Processing: Creating Inundation Maps with very Large Terrain

We often have to deal with very large models covering hundreds of river miles.  The terrain data associated with these models can be equally massive, which can cause memory/processor issues when trying to delineate inundation maps. This post is not concerned with pre-processing our model geometry. Instead, we have a completed model with results we […]

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The Projection File

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 […]

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2D Troubleshooting – Fragmented Inundation

(Initial post 19 Feb., 2015.  Updated 20 Feb., 2015).  I continue to be more and more impressed with how user-friendly and robust the new 2D feature is in HEC-RAS.  However, there are some issues to be aware of, particularly in how results are mapped.  I want to take the next two blog posts to highlight […]

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Including Channel Bathymetry into your Terrain.

Let’s say you have a digital terrain model of the area you want to model with 2D HEC-RAS.  ONLY 2D RAS.  In other words, you want to lay out a grid, but do not want to have do to any 1D computations-all 2D.  The problem is the area you want to model includes one or […]

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