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

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

Thursday, May 19, 2022
8:30 am – 3:50 pm MDT (incl. a 30-min break)


Presented by
Bill Simpson, PE

Unreinforced Slope Stability
Fundamentals of slope instability
Soil and geological mechanics related to slope instability
How geologic conditions affect slope stability
Observations of slope instability
Construction practices to improve or restore slope stability
Equations, calculations and example of an unreinforced slope

How to Design a Mechanically Stabilized Earth (MSE) Slope
Geosynthetic properties for use in slope stabilization
Material required for the exposed face of the slope to maintain long term stability
Equations, calculations, and example of using geosynthetics to reinforce a slope
Soil properties and conditions that contribute to slope stability
Deep seated stability analysis

Best Practices for Slope Stability and Case Histories
Preventing problems or failures through improved site layout
Preventing problems or failures through proper design techniques
Roles and responsibilities of the design and construction team to ensure structure success
Typical causes of problems or structure failure
Recognizing and preventing a problem during construction
How water (both surface and below ground) affects an earth structure
Appropriate measures to take during construction to ensure long term earth structure success
Case histories and examples of failed structures


 Webinar Instructions

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


Professional Engineers:
6.5 PDHs

6.5 HSW CE Hours

Landscape Architects:
6.5 HSW CE Hours

Floodplain Managers:

International Code Council:


Continuing Education Credit Information
Slope Stabilization and Landslide Prevention – Rocky Mountain Region
This webinar is open to the public and offers 6.5 PDHs to professional engineers, 6.5 HSW continuing education hours to licensed architects, and 6.5 HSW continuing education hours to landscape architects in Montana.

Engineers and architects seeking continuing education credit in other states will be able to claim the hours earned at this webinar, in most cases. Refer to specific state rules to determine eligibility.

The American Institute of Architects Continuing Education System has approved this course for 6.5 LU|HSW (Sponsor No. J885). Only full participation is reportable to the

The Landscape Architecture Continuing Education System has approved this course for 6.5 HSW PDHs. Only full participation is reportable to the LA CES.

The International Code Council has approved HalfMoon Education as a Preferred Provider of continuing education (No. 1232). Course approved for .65 CEUs in the specialty area of Sitework.

This webinar has been approved by the Association of State Floodplain Managers for 6.5 CECs for floodplain managers.

Visit this course listing at for updates on pending credits.

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


Bill Simpson, P.E.

Geotechnical Structure Design Specialist at Gradelta Engineering

Mr. Simpson founded Gradelta Engineering in 2020 with the intent to help clients better understand the combination of geotechnical and structural engineering that he has worked with for the past 20 years. He earned his B.S.C.E. and M.S.C.E. degrees from Georgia Institute of Technology. He currently provides engineering services to contractors and fellow engineers for earth structure pricing, along with the plans and calculations needed for construction. He frequently consults with clients regarding the optimal structure type and location on the construction site to minimize risk and maximize useable space. He also works in the education sector providing not just seminars such as this one, but also acting as a subject matter expert creating study guide and test prep content for the NCEES Professional Civil Engineer exam. Mr. Simpson has also worked with lawyers and insurance companies during forensic investigation and lawsuits surrounding retaining walls and slope failures. His hope is that through the instructional services that he currently provides, slopes will remain stable and retaining wall failure will be eliminated.

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 ( 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: Slope Stabilization and Landslide Prevention – Rocky Mountain Region

Delivery Method: Live Online

Course Description: This course examines the fundamentals of slope instability and the effect that soil properties, geological mechanics and site conditions have on a slope’s stability, with a focus on the Rocky Mountain region. The course uses examples of unreinforced slopes to demonstrate analysis through the use of equations and calculations and teaches learners how to identify, prevent and mitigate slope instability through improved site layout, design techniques and geosynthetics.

Learning Objectives:

Learning Objective 1:
Learners will be able to identify and discuss the fundamentals of slope instability and the effect that soil, geologic conditions, and water play in stability.

Learning Objective 2:
Learners will be able to design a mechanically stabilized earth slope through the use of equations and calculations.

Learning Objective 3:
Learners will be able to prevent slope failure through improved site layout, proper design techniques, and the identification of potential problems.

Learning Objective 4:
Learners will be able to explain how the presence of water (both surface and below ground) affects an earth structure and take appropriate measures to ensure long term earth structure success.

LUs: 6.5                                                                                              LU Type: LU|HSWs.

Prerequisites: Site design and slope analysis

Advance Preparation: None

Program Level: Intermediate

Course Expiration Date: 

Complaint Resolution Policy:

Complaints regarding this course can be emailed to 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