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. […]

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HEC-RAS Subgrid Bathymetry Theory and Application

Mark Forest is one of the most knowledgeable H&H modelers I know.  He’s also a very experienced RAS modeler.  Here he discusses the benefits of the relatively unique subgrid bathymetric approach to terrain surface discretization that HEC-RAS uses, specifically on the topic of computational mesh cell size.  Read this.  Then read it again.  This is […]

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Learn how to Automate HEC-RAS – The Monte Carlo Method

First off, I hope all of the HEC-RAS users out there are staying safe and healthy during this COVID19 pandemic.   I hope that in the midst of all of this, you would find some positives.  Maybe a re-calibration of your life priorities, re-connection (virtually of course) with friends and family, or even learning a new […]

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HEC-RAS Pub & Grub Recap

HEC-RAS Pub & Grub 2020 recap. A review of the 2020 HEC-RAS Pub & Grub Event that took place at the Craft Brew Alliance's pH Experiment pub in Portland Oregon Feb 20, 2020.

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Online Class – Using HEC-RAS to Modeling Bridges, Culverts, and Floodplains

Hey RAS Users- This is a basic level steady flow HEC-RAS class.  That’s right, we start from the very beginning with HEC-RAS-steady flow theory, building 1D geometry, steady flow boundary conditions, and even introductions to RAS Mapper and 2D modeling.  I’ll be hosting weekly live sessions for this class to review the course material and […]

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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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