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

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

Learning Outcomes

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

• Add terrain, shapefiles and web imagery within HEC-RAS directly
• Combine 2D modeling with 1D riverine components
• Add proposed conditions terrain
• Generate depth grids and flood elevations for use in various CADD software.
• Trouble shoot common HEC-RAS errors encountered in coupled 1D/2D modeling

Webinar Benefits

• Learn how to couple 1D and 2D modeling within HEC-RAS
• Efficiently map flooding depths, velocities and flood extents
• Insight to some “work arounds” to overcome some of the early version deficiencies of the software

Assessment of Learning Outcomes

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

Intended Audience

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

Webinar Outline

• RAS mapper basics and data layers
• Terrain processing
• 2D model development
• Coupling of 1D and 2D components within the model
• Tips for working around some of the initial version limitations.
• Applying hydrology to the coupled model via direct precipitation on surface and external boundary conditions
• Common error messages encountered
• Generate CADD data for incorporation into exhibits

How to Earn your CEUs/PDHs and Receive Your Certificate of Completion

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]