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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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TagsHEC-RAS,

This year’s Texas Floodplain Management Association (TFMA) Fall Conference was held in Rockwall, Texas from September 19-21, 2012.

Freese and Nichols’ staff presented the following topics for the Fall 2012 conference, which are now available for download (click the title to view the presentation):

Using Calibrated Hydrology, Unsteady Hydraulics, and Stream Geomorphology to Better Define Flooding and Erosion Risks Along Marys Creek

  • Hector Olmos, PE, CFM – Freese
  • ...

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TagsTexas Floodplain Management Association, City of Fort Worth, City of Bryan, City of Benbrook,

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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TagsHEC-RAS,