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The U.S. Army Corps of Engineers recently released HEC-RAS 5.0.1, which fixes a few computational bugs that were identified in HEC-RAS 5.0. Download the new version at the link below.

http://www.hec.usace.army.mil/software/hec-ras/downloads.aspx

 

 

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Unsteady HEC-RAS can be a useful tool for modeling complex river systems; however, it can also be more difficult to troubleshoot than steady state models. The model sometimes crashes suddenly and displays a red bar across the computation window stating that the model is “unstable.” Below are some tips to avoid the dreaded “red bar” and for developing a stable running unsteady HEC-RAS model.

  1. Model stability can be sensitive to the computation interval. Lowering the computation interval of your plan file may reduce your error and make the model more stable.
  2. If a drop
  3. ...

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In riverine systems, bridges typically represent an obstruction to channel and floodplain flow. The obstruction to flow can be a source of substantial energy loss. In order to appropriately model the energy loss due to a bridge in HEC-RAS, there are some things you should know.

Bridge modeling in HEC-RAS has several components:

  • Bounding cross sections
  • Ineffective flow areas
  • Bridge opening

This post provides the information necessary to model a simple bridge using HEC-RAS.

Bounding Cross Sections

Bounding...

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For more information, contact Hector Olmos.

  1. Model stability can be sensitive to the computation interval. Lowering the computation interval of your plan file may reduce your error and make the model more stable.
  2. If a drop structure is present in the model, the best way to represent it is as an inline structure.
  3. Lateral and inline structure stability factors can improve model stability. In order to improve model stability, try increasing your stability factor from 1.0. The stability increases as you approach 3.0, but
  4. ...

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