Slope Stabilization and Landslide Prevention in the Pacific Northwest
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8:00 – 8:30 am PST
8:30 am – 12:45 pm PST
12:45 – 1:45 pm PST
1:45 – 5:00 pm PST
Curran E. Mohney, RG CEG
Slope Movement and Mechanisms
Type of slope movement and instability
• Rockfall and rockslides
• Translational and rotational failures
• Debris flows and rapidly moving landslides
Analyzing the stability of slopes
Slope stability concepts
• Reviewing geological conditions
Effects of regional geology
• Examining soils and topography
• Evaluating surface and groundwater
• Shoreline and streambank erosion
A brief discussion of soil and rock mechanics
• The influence of water
• Testing soil properties for design data
Evaluating types of slopes
• Natural slopes
• Engineered slopes
Methods of slope stability analysis
Slope Stabilization Methods
Use of vegetation (biostabilization)
Installing earth retention structures
Rock slope stabilization
Debris flow stabilization
Buttressing for streambank stabilization and environmental considerations
Refining and selecting methods
Landslide Hazard and Risk Assessment
Definitions and elements of landslide hazard risk
Risk-reduction strategies (objectives for landslide mitigation)
Lifecycle cost analysis
Case History in Landslide Mitigation
Slope stabilization using retaining walls
Slope stabilization using combination of methods
Slope stabilization using earthworks
Shear keys and buttresses
Slope stabilization using drainage
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.
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(Non-Mandatory in WA)
(Non-Mandatory in WA)
Architects (AIA credits only available for attending live Webinar)
7.0 HSW CE Hours
7.0 AIA LU|HSW
Landscape Architects (LA CES credits only available for attending live Webinar)
7.0 HSW CE Hours
7.0 LA CES HSW PDHs
International Code Council
7.0 ASFPM CECs
7.0 SAF Cat 1 CFE Credits
Continuing Education Credit Information
This webinar is open to the public and offers a 7.0 PDH non-mandatory continuing education opportunity to Washington engineers and geologists, and 7.0 HSW PDHs to Washington architects and landscape architects. Courses and providers are not subject to preapproval in Washington.
This webinar offers 7.0 PDHs to Oregon engineers, registered geologists (RG) and certified engineering geologists (CEG), and 7.0 HSW continuing education hours to Oregon architects and landscape architects. Courses and providers are not subject to preapproval in Oregon.
Engineers, geologists, architects and landscape architects in other states will be able to apply the credits earned at this webinar, in most cases. Refer to specific state rules to determine course eligibility. HalfMoon Education is not seeking approval for landscape architects in New Jersey, or geologists in North Carolina, South Carolina or Delaware.
The American Institute of Architects Continuing Education System has approved this course for 7.0 LU|HSW (Sponsor No. J885). Only full participation is reportable to the AIA CES.
The Landscape Architecture Continuing Education System has approved this course for 7.0 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 approval is pending in the specialty area of Sitework. Visit this course listing at www.halfmoonseminars.org for updates on pending credit.
This webinar has been approved by the Association of State Floodplain Managers for 7.0 CECs for floodplain managers.
The Society of American Foresters has approved this course for 7.0 Cat. 1 CFE credits.
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).
Curran E. Mohney
Mr. Mohney is the Engineering Geology Program leader for the Oregon Department of Transportation (ODOT). The Engineering Geology Program at ODOT encompasses site characterization, subsurface exploration, slopes and embankments, geologic hazards, groundwater, geotechnical instrumentation, and planning and research activities. In this role, he also oversees the Unstable Slopes (landslide/rockfall) Program for ODOT. He is a registered geologist and a certified engineering geologist in Oregon with over 25 years of experience in Oregon and the western states. Mr. Mohney has been the Engineering Geology Program leader since 2004. Prior to this, he had been a staff and project-level geologist for consulting firms and the mining industry as well as for ODOT. He is a graduate of the Geology Program at Portland State University. During his professional career, Mr. Mohney has been involved in the investigation, design, and mitigation of hundreds of landslides and rockfalls.
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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 (firstname.lastname@example.org or (800) AIA 3837, Option 3).
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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 in the Pacific Northwest
Delivery Method: Live Online
Course Description: This course examines the types and causes of slope movements and how slopes can be stabilized. It explores landslide hazards, risks, and mitigation strategies specific to conditions found in the Pacific Northwest.
Learning Objective 1:
Learners will be able to identify types and causes of slope movement and instability.
Learning Objective 2:
Learners will be able to identify and describe conditions, soil and topography that tend to maintain slope stability, and they will be able discuss stability issues for natural slopes and engineered slopes.
Learning Objective 3:
Learners will be able to describe methods to sustain slope stability, including the use of vegetation, surface protection, unloading, buttressing, drainage, reinforcement, installation of earth retention structures, and combining methods.
Learning Objective 4:
Learners will be able to analyze landslide hazards and risks and describe risk-reduction/mitigation strategies.
LUs: 7.0 LU Type: LU|HSWs.
Prerequisites: Familiarity with site development and earthwork
Advance Preparation: None
Program Level: Intermediate
Course Expiration Date: 12/13/2024
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