Attendance instructions will be emailed before the date of the program.

In-person Attendees: Please arrive to the seminar 30 minutes early to sign in.
Online Attendees: Please log into the webinar 15 – 30 minutes before start time.

Wednesday, April 5, 2023 | 8:30 am – 4:50 pm CDT (including a 30-min. break)


Introductions and One Dimensional Steady Flow HEC-RAS Review 

  • Introduction and Overview  
  • Basic Definitions and Assumptions 
  • Conservation of Energy and Energy Losses  
  • Computational Enhancements 


Unsteady One-Dimensional Open Channel Hydraulics Background and Theory  

  • Basic Assumptions 
  • Conservation of Mass  
  • Conservation of Momentum 
  • Computational Algorithm  
  • Boundary and Initial Conditions 


Two-Dimensional Open Channel Hydraulics Background and Theory 

  • Basic Assumptions  
  • Conservation of Mass 
  • Conservation of Momentum  
  • Boundary and Initial Conditions 
  • Computational Mesh and Algorithm  
  • HEC-RAS and Historical Perspectives 


Demonstration 1 – Building an Unsteady 1D HEC-RAS Model without GIS 

  • HEC-RAS User Interface  
  • Generating the Geometry 
  • Generating the Boundary and Initial Conditions 
  • Initial Conditions  
  • Unsteady Flow Computational Simulation 
  • Viewing of Results 


Demonstration 2 – GIS Basics 

  • Introduction and Overview  
  • Geographic versus Projected Coordinate Systems 
  • Raster versus Vector Files  
  • ArcMap versus ArcCatalog 
  • ArcMap Interface Basics  
  • Digital Elevation Model 
  • Other Files  


Demonstration 3 – Building an Unsteady 1D HEC-RAS Model with GIS 

  • RASMapper Interface and the Projection File 
  • Digital Elevation Models and Geometry Creation 
  • Generating the Boundary and Initial Conditions 
  • Unsteady Flow Computational Simulation  
  • Display and Interpretation of Results 


Demonstration 4 – Building a Basic 2D HEC-RAS Model 

  • RASMapper Interface and 2D Geometry 
  • 2D Mesh Generation  
  • 2D Boundary and Initial Conditions 
  • Other Miscellaneous Computational Parameters 
  • 2D Computational Simulation  
  • Display and Interpretation of Results 


Demonstration 5 – 2D HEC-RAS Model with Connections 

  • RASMapper Interface and Mesh Generation 
  • Spatially Varied Manning’s n  
  • Connections 
  • 2D Computational Simulation  
  • Viewing and Interpreting Results 


Demonstration 6 – 1D/2D HEC-RAS Model and Other Considerations 

  • RASMapper Interface and Combined 1D/2D Mesh Generation 
  • Manning’s n and Connections 
  • External 2D Flow Area Boundary Conditions 
  • Other Miscellaneous Computational Parameters 
  • 1D/2D Computational Simulation 
  • Viewing and Interpreting Result


Webinar Instructions
Each webinar session earns continuing education credit and can be registered for individually. All attendees must log-on through their own email – attendees may not watch together if they wish to earn continuing education credit. HalfMoon Education Inc. must be able to prove attendance if either the attendee or HalfMoon Education Inc. is audited.

Certificates of completion can be downloaded in PDF form upon passing a short quiz. A link to the quiz will be sent to each qualifying attendee immediately after the webinar. The certificate can be downloaded from the Results page of the quiz upon scoring 80% or higher.

Webinars are presented via GoToWebinar, an easy-to-use application that can be run on most systems and tablets. Instructions and login information will be provided in an email sent close to the date of the webinar. It is highly recommended that you download, install and test the application before the webinar begins by clicking on the link in the email.

GoToWebinar App requirements:
Windows 7 – 10 or Mac OSX Mavericks (10.9) – macOS Catalina (10.15)

Web Browser:
The two most recent version of the following browsers:
Google Chrome, Mozilla Firefox, Apple Safari, Microsoft Edge
Internet Explorer v11 (or later) with Flash enabled

Internet connection: Minimum of 1Mbps       Hardware: 2GB RAM or more

For more information, visit the Support section at


7.0 PDHs 

Practicing Institute of Engineering 
7.0 PDHs 

Landscape Architects 
7.0 HSW CE Hours 

7.0 HSW PDHs 

Floodplain Managers 

Geologists (Non-credit learning opportunity)
7.0 PDHs (in some states) 


Continuing Education Credit Information
This seminar and webcast are open to the public and are designed to qualify for 7.0 PDHs for professional engineers and 7.0 HSW continuing education hours for landscape architects in Missouri, and most other states that allow this learning method. Please refer to specific state rules to determine eligibility. 

The Missouri Board does not pre-approve engineering courses or activities; it is up to the licensee to determine what activities are appropriate. 

The Landscape Architecture Continuing Education System has approved this course for 7.0 HSW PDHs. Only full participation is reportable to the LA CES. 

This course has been approved by the Association of State Floodplain Managers for 7.0 CECs for floodplain managers. 

The webcast format of this course has been approved by the Practicing Institute of Engineering for 7.0 PDHs in the fields of engineering, landscape architecture and geology. This approval is appropriate for professionals licensed in New York. 

This course offers 7.0 PDHs to professional geologists in some states. HalfMoon Education has not applied for state geologist continuing education approval in states requiring such. 

Attendance will be monitored, and attendance certificates will be available after the webinar for those who attend the entire course and score a minimum 80% on the quiz that follows the course (multiple attempts allowed; only required for online attendees). 


On-Demand Credits
The preceding credit information only applies to the live presentation. This course in an on-demand format may not be eligible for the same credits as the live presentation; please consult your licensing board(s) to ensure that a structured, asynchronous learning format is appropriate. The following pre-approvals may be available for the on-demand format upon request: 

7.0 HSW PDHs (LA CES) 

7.0 CECs (ASFPM) 


Gregory H. Nail

Dr. Gregory H. Nail is an associate professor in the Engineering Department at the University of Tennessee at Martin where he teaches a variety of courses including fluid mechanics, hydraulics and hydrology, and hydraulic and hydrologic modeling. He holds a professional engineer’s license based on having passed both the Civil and Mechanical discipline-specific exams. Prior to coming to UT-Martin in 2002 he worked as a research hydraulic engineer for the United States Army Corp of Engineers for 11 years. He is a former member of the Executive Committee of the Tennessee American Water Resources Association, and he has lectured on various HEC-RAS modeling topics at the Annual Tennessee Water Resources Symposium and at other venues. Dr. Nail earned his B.M.E. degree from Auburn University and his M.S. and Ph.D. degrees from Texas A&M University.

Seminar Price: $319.00