Webinar instructions will be emailed before the date of the webinar.

Please log into the webinar 15 – 30 minutes before start time.

Log into Webinar
8:00 – 8:30 am CDT
Morning Session
8:30 am – 12:00 pm CDT
12:00 – 1:00 pm CDT
Afternoon Session
1:00 – 5:00 pm CDT

Presented by
Gregory H. Nail, PhD, PE

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
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 results

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 will be provided for each webinar attended and will be sent via email in PDF form about five business days after the conclusion of the series.

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


Professional Engineers
7.0 PDHs

Floodplain Managers

Continuing Education Credit Information

This webinar offers 7.0 PDHs to professional engineers licensed in all states.

HalfMoon Education is an approved continuing education sponsor for engineers in
Florida (Provider No. 0004647), Indiana (License No. CE21700059), Maryland, New Jersey
(Approval No. 24GP00000700), North Carolina (S-0130), and North Dakota. HalfMoon
Education is deemed an approved continuing education sponsor for New York engineers
via its registration with the American Institute of Architects Continuing Education
System (Regulations of the Commissioner §68.14(i)(2)). Other states do not preapprove
continuing education providers or courses.

The Association of State Floodplain Managers has approved this course for 7.0 CECs.

Completion certificates will be awarded to participants who complete this event, respond
to prompts, and earn a passing score (80%) on the quiz that follows the presentation
(multiple attempts allowed).


Dr. Gregory H. Nail

Associate Professor, University of Tennessee at Martin
Dr. 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.

Streamable MP4/PDF Price: $299.00

Currently, our self-study products DO NOT qualify for AIA, ASLA, LACES or CLARB credit.

Streamable self-study formats are available approximately 1 week after the date of the live event.

The streamable self-study package includes an MP4 format video recording of a live webinar and a PDF of the manual that was distributed for the webinar. You will receive a PDF of the course manual. The manual contains written materials prepared by the seminar speaker(s).

Completion of an online follow-up quiz is required for those seeking continuing education credit. The acceptance of self-administered continuing education activities vary widely between states and professions. Before undertaking any self-study effort, you should review the rules of your licensing/certifying entity.

HalfMoon Education guarantees its products. The self-study products are recorded from a live seminar and there are circumstances where an audio recording is not available. HalfMoon will contact you and issue a full refund if the product you ordered is not available. If you are not happy with a product you receive, you can return the product for a full refund. However, refunds will not be issued if completion certificates are requested.

Learn More