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Understanding the Use of Ineffective Flow Areas in HEC-RAS

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Instructor Information: Matthew Zeve, P.E. CFM, M.ASCE

Course Length: 1 Hour

Purpose and Background

The U.S. Army Corps of Engineers Hydrologic Engineering Center’s HEC-RAS software program is a widely used tool for various openchannel hydraulics analysis and design tasks. Oftentimes, the hydraulic design and analysis tasks involves the consideration of structures such as bridges, weirs, and culverts in a channel. When this is the case, the use of the ineffective areas often comes into consideration.

Although modeling bridges, culverts, and other structures is a common task in a hydraulic study, many engineers are uncertain when it comes to the application of ineffective flow areas in HEC-RAS models. Additionally, ineffective flow areas take on extra significance for un-steady flow simulations in HEC-RAS, so the proper implementation of ineffective flow areas is important to understand.

This webinar will provide participants who have a strong background using HEC-RAS with a better understanding of the role of ineffective flow areas. The purpose, various applications, proper use, and review of how to set ineffective flow areas will be discussed. The presentation will include several screen captures from HEC-RAS models to illustrate the points made during the discussion.

Learning Outcomes

This webinar will provide engineers and others that use HEC-RAS with a better understanding of the purpose and application of ineffective flow areas within a HEC-RAS model.

Seminar Benefits

- Understand the purpose of ineffective flow areas 
- Discuss proper implementation of ineffective flow areas 
- Learn how ineffective flow areas can affect model results 
- See examples of proper and improper use of ineffective flow areas 

Intended Audience

Civil engineers seeking to gain a better understanding of the use of ineffective flow areas in HEC-RAS modeling will benefit from this webinar. Participants should have a good working knowledge of the HEC-RAS software program before taking this course.

Seminar Outline

- Definition of ineffective flow areas 
- Application of ineffective flow areas 
- Ineffective flow area effects on model results 
- Examples of proper and improper use of ineffective flow areas