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John Rutledge, Patrick Miles, and Garrett Johnston, all professional engineers with Freese and Nichols, conducted a three-day HEC-RAS 2D workshop in Oklahoma City, hosted by the Oklahoma Water Resources Board (OWRB) Dam Safety program. Discussion and activities focused on applications and benefits of HEC-RAS 2D modeling; RAS Mapper and terrain preparation; running 1D and 2D models including dam, levee, and breach modeling; viewing results with RAS Mapper; troubleshooting and model review. The workshop included a number of hands-on modeling...

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John Rutledge, Patrick Miles, and Garrett Johnston, all professional engineers with Freese and Nichols, conducted a three-day HEC-RAS 2D workshop in Oklahoma City, hosted by the Oklahoma Water Resources Board (OWRB) Dam Safety program. Discussion and activities focused on applications and benefits of HEC-RAS 2D modeling; RAS Mapper and terrain preparation; running 1D and 2D models including dam, levee, and breach modeling; viewing results with RAS Mapper; troubleshooting and model review. The workshop included a number of hands-on modeling...

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TagsOklahoma Water Resources Board, HEC-RAS,

The USACE has released a new version of HEC-RAS that supersedes versions 5.0.1 and 5.0.2 (which was withdrawn due to major bugs). The new version fixes several bugs and includes new and improved features like culvert inlet/ outlet control, using 2D flow equations at lateral structures, flow and volume time series output for profile lines in RAS Mapper, and profile line point and tick marks. For more info on the new version and to download the model, check out the links below.

Release Notes:...

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This article is the first in our blog series on HEC-RAS modeling. Be sure to check back for subsequent series articles.

Background

The Federal Emergency Management Agency (FEMA) regulates development within the 100-year floodplain by administrating the National Flood Insurance Program (NFIP). Communities that participate in the NFIP must prevent excessive development within the floodplain that could cause increases in potential flood damage. FEMA also does not allow development to occur within the floodway, which has a maximum allowable surcharge of...

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TagsHEC-RAS, Floodway, floodplain, 100-year flood, FEMA,

UPDATE: The USACE posted the following update on their website, regarding HEC-RAS Version 5.0.2 - “We've temporarily taken down HEC-RAS 5.0.2 to investigate a critical bug with simplified physical breaching computations. We will be releasing a 5.0.3 soon to fix this issue. We apologize for any inconvenience that this might cause. If you need to download HEC-RAS in the meantime please use the 5.0.1 download links available in the archived versions section below.”

Original Post: The USACE has released a new version of HEC-RAS that...

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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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