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

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

Friday, February 19, 2021
8:30 am – 4:30 pm CST (incl. a 60-min. break)

Presented By

Dr. William J. Rahmeyer

Understanding Open Channel Flow
Basic concepts of open channel flows
Uniform and normal flow
Steady and unsteady flow
Reynold’s number
Laminar and turbulent flow
Gradually varied flow definition
Hydraulic radius
Continuity principle
Energy Principle
Examples of open channel flow

Design Fundamentals of Open Channel Flow
Application example of the energy equation
Channel shapes and properties
Manning’s Equation for normal depth
Compound channels
Specific energy diagram
Critical and normal depth
Calculating Froude number
Flow regimes of super and subcritical flow
Conservation of linear momentum

Flow Resistance in Open Channels
Flow shear
Rigid and alluvial (natural) boundaries
When Manning’s n is not constant
Cowan’s equation for additive resistance
Bed Forms
Vegetated surfaces
Iterative solution of normal depths using Manning’s equation
HEC-RAS Sediment and its effect on resistance

Principles of Open Channel Flow Design
Classification of water surface profiles
Upstream and downstream control
Synthesis of composite profiles
Rapidly varied flow
Hydraulic jumps
Calculating flow depths in open channels (review)
Floods and storm runoff
Fluvial geomorphology and channel response

Stable Channel Design
Example of solving an open channel problem with diverging flows
Sedimentation, erosion, and deposition
Channel bank and bed protection
Hydraulic structures used in open channel flow
Culverts, flumes, weirs, and gates
Principles of open channel design
Example of designing a trapezoidal channel

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:
6.5 PDHs

Floodplain Managers:

Continuing Education Credit Information

This webinar offers 6.5 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

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

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. William J. Rahmeyer

Dr. William J. Rahmeyer is a professor of Civil and Environmental Engineering at Utah State University and the director of the Hydro Composite Modeling Laboratory. For almost eight years he served as the department head of Civil and Environmental Engineering at Utah State University. Mr. Rahmeyer also has a joint appointment as the senior professor of the Hydraulics and Fluid Mechanics program of the Utah Water Research Laboratory at Utah State University. In the past, he has served as the division head of Water Engineering, as the interim division head of both the Structures Division and the Transportation Division, and as the undergraduate curriculum division head. Mr. Rahmeyer is a fellow in the American Society of Civil Engineers. His professional engineering license is in the State of Colorado. He serves on committees for the American Society of Engineering Educators (ASEE), the American Society of Civil Engineers (ASCE), the International Association of Hydraulic Research (IAHR), the Association of State Dam Safety Officers (ASDSO), the Instrument Society of America (ISA), the American Water Works Association (AWWA), the International Erosion Control Association (IECA), and the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE).
Mr. Rahmeyer regularly attends and presents at the annual conferences of ASDSO, ASEE, ASCE, IAHR, ASCE National Department Heads, and the Transportation Research Board (TRB). In the past, he has been a member of the United States Committee on Large Dams (USCOLD) and the International Committee on Large Dams (ICOLD). Before joining Utah State University in 1986, he was a research professor at Colorado State University. Dr. Rahmeyer has conducted research, published, and taught courses in hydraulics, fluid mechanics, open channel flow, hydraulic structures, and sediment transport for almost 40 years.

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.

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