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HEC-RAS 2D Agenda (TWRA)
HEC-RAS 2D Modeling with HEC-RAS
18-26 May 2026
Instructors
Stanford Gibson, PhD (Stanford Gibson Bio)
Calvin Creech, PhD, PE (Calvin Creech Bio)
Downloads
Requisite Software and Data
- Install HEC-RAS 7.0 and RAS2025 on computers
Day 1
| Time | Topic | Objective | Material | Instructor | |
|---|---|---|---|---|---|
| 1400-1430 | L0 | Introductions Course Overview | Welcome and discussion of class expectations | ||
| 1430-1530 | L1.1 | Example HEC-RAS Modeling and Demo | This will be a very accessible overview of the types of projects and analyses you can do with HEC-RAS including flood-risk, dam failure, mud and debris, hurricane, bridge, and restoration analyses. We will also explore flood damage and modeling from recent island flood events in Hawaii. | Stanford | |
| 1530-1600 | L1.2 | Creating an HEC-RAS Terrain | Developing a terrain model and creating dataset for 2D modeling | Calvin | |
1600- 1700 | W1.3 | Creating an HEC-RAS Terrain Workshop | Students will create a Terrain in HEC-RAS | Calvin |
Day 2
| Time | Topic | Objective | Material | Instructor | |
|---|---|---|---|---|---|
| 0800-0830 | L2.1 | Introduction to HEC-RAS Subgrid Bathymetry | Discussion on the use of sub-grid bathymetry for finite volume computations in HEC-RAS. The benefits of variable cell size on computational performance will be discussed. | Stanford | |
| 0830-0915 | L2.2 | Mesh Generation and Refinement and Introduction to Editing in RAS Mapper | This presentation will discuss the basic concepts of creating a 2D Mesh in HEC-RAS and then how to improve and refine a 2D Mesh with Breaklines and Refinement Regions. It will include strategies for aligning your channel cells with flow. | Stanford | |
| 0915-0930 | Break | ||||
| 0930-1030 | W2.3 | Mesh Generation and Refinement Workshop | This workshop will provide hands-on experience in using HEC-RAS Mapper to create a 2D flow area mesh and refine it to capture high ground using breaklines and refinement regions | Stanford | |
| 1030-1045 | Review Quiz Game | ||||
| 1045-1130 | L2.4 | Boundary and Initial Conditions | The different types of boundary conditions and establishing initial conditions will be discussed. | Calvin | |
| 1130-1245 | Lunch | ||||
| 1245-1400 | W2.5 | Creating a Simple 2D Model Workshop | Students will create their first 2D model. | Calvin | |
| 1400-1430 | L2.6 | Developing Manning's n Values from Land Cover Data | This lecture will describe how to create a Land Cover data set; associate Manning’s n values to Land Cover; and override Manning’s n values with 2D Manning’s n value regions | Stanford | |
| 1430-1500 | L2.7 | Visualization of HEC-RAS Results in HEC-RAS Mapper | An introduction to RAS Mapper is provided, specifically for visualizing HEC-RAS results. | Calvin | |
| 1500-1515 | Break | ||||
| 1515-1545 | L2.8 | Essential Computation Options | Discussion of essential parameters and computational options for running a 2D model including equation choice, cell size considerations, and time step considerations. | Calvin | |
| 1545-1700 | W2.9 | Landcover and n-Values | Add land cover and refine your channel mesh. | Calvin |
Day 3
| Time | Topic | Objective | Material | Instructor | |
|---|---|---|---|---|---|
| 0800-0845 | L3.1 | Terrain Modifications Demonstration | Using existing 1D cross sections for terrain modification and introduction to cloning a terrain and adding simple terrain modifications. | Calvin | |
| 0845-0930 | L3.2 | Modeling Levees with SA/2D Connections | Discussion of how to use SA/2D Connections in a 2D Flow Area | Stanford | |
| 0930-0945 | Break | ||||
| 0945-1130 | W3.3 | Breaching and Building Levees: Terrain Mod Working Session | In this workshop, students will utilize 2D Connections (internal hydraulic structures) inside of a 2D Flow Area to improve the river hydraulics model by overriding terrain elevations. | Stanford and Calvin | |
| 1130-1200 | L3.4 | Troubleshooting Tools and Strategies | Discussion on common model stability issues, troubleshooting strategies, and more. | Calvin | |
| 1200-1330 | Lunch | ||||
1330-1415 | 3.5 | HEC-RAS 2025 Overview and Demo | Stanford | ||
| 1415-1430 | Review Quiz Game | ||||
1430-1530 | 3.6 | Mesh Development and Export to 7.0 | Stanford | ||
| 1530-1545 | Break | Break | |||
| 1545-1700 | 3.7 | Workshop - Building a Simple Wu Model in RAS2025 | We will start over on our Wu model with the new RAS2025 software and find out how much easier it is to build a mesh in RAS 2025 (especially for a modular geometry like the Wu). We will also learn to export a RAS 2025 mesh to HEC-RAS 7.0 so that we can use it to build our meshes in day 4. | Stanford and Calvin |
Day 4
| Time | Topic | Objective | Material | Instructor | |
|---|---|---|---|---|---|
| 0800-1700 | Working Session with the Wu River | We will build the Wu model together and teams can add the NBS alternatives to the models. Please bring models or data to work build HEC-RAS 7.0 or 2025 meshes or models with. |
Day 5
| Time | Topic | Objective | Material | Instructor | |
|---|---|---|---|---|---|
| 0800-0900 | L5.1 | Bridge Modeling | This lecture will cover how to approach bridge modeling using the new 2D Bridge approach and to perform very detailed multi-dimensional hydraulic analyses. Students will learn how to set up a model to get detailed water surfaces and velocities. | Stanford | |
| 0900-1030 | W5.2 | Bridge Modeling Workshop | Students will utilize the simplified (1D) bridge modeling approach in HEC-RAS 2D to model a bridge. | Stanford and Calvin | |
| 1030-1200 | W5.3 | Add Bridges to Wu | |||
| Afternoon |
| Group Presentations and Closing Ceremonies |
Day 6 and 7
Advanced Working Session
Please send HEC models, terrains, and hydrologic data with some description of the model domain and objective.
Current Best models: Wu(HEC).p02.zip