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Presenter: Bill Simpson

Seminar Date:

Seminar Location: Online

Register Now * Coordinator Registration Not Available.


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

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8:30 - 9:00 am CST

Morning Session
9:00 am - 12:15 pm CST

12:15 - 12:45 pm CST

Afternoon Session
12:45 - 5:00 pm CST

Retaining Walls: What They Do and How They Do It

Identifying and quantifying forces acting on retaining walls
Weight of the wall
Pressure from retained soil
Pressure on foundation of wall
Characteristics of soil
Loads on retained soil
Impacts of water
Equations and examples

Geosynthetics and Retaining Walls, Embankments and Slopes

Calculations and software
Types of retaining walls
Learn to visually identify geosynthetics as to type, method of manufacture, relative strength, relative permeability, and relative cost

Global/Slope Stability Analysis

Examining deep seated failures
Methods of slope stability analysis
Global stability and site layout
Stabilization techniques
Drainage Reinforcement/mechanical stabilization
Fundamental soil characteristics and global instability
Engineering mechanics underlying global instability
Field observations to distinguish types of instability
Construction practices to improve or restore stability
Site layout practices to improve stability/prevent instability

Retaining Wall Failures and Fixes

How to prevent a potential problem or failure through site layout
How to prevent a potential problem or failure through proper design techniques
Roles and responsibilities to ensure structure success
How to recognize a potential problem or failure in the field
Typical causes of problems or failures with geotechnical structures
Case studies/examples of failures and repairs

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 www.gotowebinar.com

Credit Information:

Who Should Attend

  • Architects
  • Engineers
  • Contractors
  • Landscape Architects
  • Floodplain Managers

Professional Engineers
7.0 PDHs

7.0 HSW CE Hours

Landscape Architects
7.0 HSW CE Hours


Floodplain Managers

Continuing Education Credit Information This webinar offers 7.0 PDHs to professional engineers and 7.0 HSW continuing education hours to architects licensed. It offers 7.0 HSW continuing education to landscape architects.

The American Institute of Architects Continuing Education System has approved this event for 7.0 LU|HSW (Sponsor J885). Visit www.halfmoonseminars.org for complete AIA/CES course information under this seminar listing. Only full attendance is reportable to AIA/CES.

HalfMoon Education has applied for course approval from the American Institute of Architects Continuing Education System (Sponsor No. J885) and the Landscape Architect Continuing Education System. HalfMoon Education has applied for course approval from the Association of State Floodplain Managers, which is pending.

The applications are under review. Visit www.halfmoonseminars.org for current credit statuses under this webinar listing.

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).


Bill Simpson

PE, Engineered Earth Solutions, LLC

Mr. Simpson is a geotechnical structure design specialist at Engineered Earth Solutions, LLC. He has designed and reviewed shop drawings for construction and repair of earth structures in the public and private sectors in over 30 states, and he consistently works on more than 1,200 projects and 10 million square feet each year. He performs site visits for new project reconnaissance, construction verification, and construction assistance. Mr. Simpson manages, supervises, instructs, and mentors a team of staff engineers to ensure strict deadlines are met for construction schedules while maintaining design and analysis accuracy. He works with owners, site designers, and contractors to provide designs which are not only structurally sufficient but also financially responsible. Mr. Simpson earned his B.S.C.E. and M.S.C.E. degrees from Georgia Institute of Technology.

Tuition Costs:

Standard Tuition: $299.00
Online Tuition (pre-registration): $299.00
Group Prices
3 or more people each: $199.00

Each registration includes one copy of a manual prepared by the seminar speakers.

AIA Info:

AIA Provider Statement:

HalfMoon Education Inc. is a registered provider of AIA-approved continuing education under Provider Number J885. All registered AIA/CES Providers must comply with the AIA Standards for Continuing Education Programs. Any questions or concerns about this provider of learning program may be sent to AIA/CES (cesupport@aia.org or (800) AIA 3837, Option 3).

This learning program is registered with AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product.

AIA continuing education credit has been reviewed and approved by AIA/CES. Learners must complete the entire learning program to receive continuing education credit. AIA continuing education Learning Units earned upon completion of this course will be reported to AIA/CES for AIA members. Certificates of Completion for both AIA members and non-AIA members are available upon request.

Course Title: Retaining Wall Design and Global Stability Analysis

Delivery Method: Live Online

Course Description:This course examines retaining wall function and principles, geosynthetics and retaining walls, embankments and slope, global/slope stability, and retaining wall failures and repairs.

Learning Objectives:

Learning Objective 1:
Learners will be able to explain how retaining walls work, and they will be able to identify and quantify the forces that act on retaining walls.

Learning Objective 2:
Learners will be able to differentiate types of retaining walls, and they will be able to identify types of geosynthetic materials and how they are used to enhance slope stability.

Learning Objective 3:
Learners will be able to identify types of deep seated slope failures, methods of slope stability analysis, slope stabilization techniques, and construction practices that improve or restore stability.

Learning Objective 4:
Learners will be able to describe how to prevent retaining wall problems or failures through proper site layout and wall design techniques, and they will be able to recognize potential retaining wall problems, causes, and repair strategies.


LUs: 7                                                                                           LU Type: LU|HSWs.

Prerequisites: Familiarity renewable energy systems

Advance Preparation: None

Program Level: Intermediate

Course Expiration Date: 09/28/2023

Complaint Resolution Policy:

Complaints regarding this course can be emailed to doug@halfmoonseminars.org or by calling (715) 835-5900. A HalfMoon Education representative will respond within 72 hours to resolve the complaint, which will include, but not limited to, access to another CE activity at no or reduced cost or a full or partial refund. Each instance will be resolved on a case-by-case situation.