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This webinar is part of a 3-part series on HEC-RAS.

The suggested order of courses:

• 1.Using RAS-Mapper HEC-RAS V5.0 (AWI121515)
• 2.Using HEC-RAS 5.0 for Two Dimensional Hydraulic Analyses (AWI011516)
• 3.Using HEC-RAS 5.0 for a Coupled 1D/2D Analysis (AWI021216)

Instructor:  Lonnie Anderson, P.E., CFM

Course Length: 1 Hour

Purpose and Background

HEC-RAS V5.0 has the ability to model runoff in a 2D environment coupled with traditional 1D modeling. There is also the ability to apply precipitation to the 2D surface, as well as external hydrographs and other boundary conditions to the 2D surface. This ability allows the modeler to fully capture the nature of the runoff event flow patterns and depths.

Visualization of the hydraulic results is extremely useful in estimating flooding extents, determining key causes of flooding and developing mitigation strategies. The 2D component allows the modeler to fully account for overbank storage volume plus the diversion and return of the overbank flow to the channel. Visual depictions of the floodwave assist with presentation to the public, clients and for reports and submittals.

This webinar focuses on a more in-depth look at the use of HEC-RAS 5.0 1D/2D coupling ability. The webinar discusses briefly the use of RAS Mapper in the development of the 2D model, preparing and importing composite surfaces to include proposed conditions in the modeling, with an emphasis on the coupling of the 1D and 2D portions of the model in RAS 5.0. Participants who wish to attend this webinar must be well-versed in using previous software versions of unsteady HEC-RAS and GIS software.

Primary Discussion Topics

• Terrain importing and editing
• Setting and editing 2D grid size
• Defining boundary conditions
• Coupling 1D and 2D components
• Mapping output options

Benefits and Learning Outcomes

Upon completion of this course, you will be able to:

• Describe how to set up and integrate 1D and 2D models in HEC-RAS, including terrain processing and boundary conditions.
• List the key steps for troubleshooting common errors and stability issues encountered in coupled 1D/2D modeling.
• Explain the impact of mesh resolution, breaklines, and boundary conditions on flood modeling accuracy.
• Discuss the benefits and limitations of using internal connectors and lateral structures to link 1D and 2D flow areas.
• Identify workarounds for HEC-RAS software limitations and common bugs, ensuring accurate and stable model performance.

Assessment of Learning Outcomes

Students' achievement of the learning outcomes will be assessed via a short post-test assessment (true-false, multiple choice, and/or fill in the blank questions).

Who Should Attend?

Civil engineers seeking to gain knowledge on the new 1D/2D features available in HEC-RAS 5.0.

How to Earn your CEUs/PDHs

To receive your certificate of completion, you will need to complete a short on-line post-test and receive a passing score of 70% or higher within 1 year of purchasing the course.

How do I convert CEUs to PDHs?

1.0 CEU = 10 PDHs [Example: 0.1 CEU = 1 PDH]