Contact Us

Email us
Phone: +1.678.367.0981
Fax: +1.240.547.1795

Mailing Address

International Society of Arboriculture
PO Box 191
Annapolis Junction, MD 20701
United States

Physical Address

International Society of Arboriculture
270 Peachtree St NW, Suite 1900
Atlanta, GA 30303
United States


Event Details

Advanced Tree Risk Assessment

Date: September 19, 2019
Location: University of Washington - Center for Urban Horticulture, Seattle, Washington, UNITED STATES
Organizer: Pacific Northwest Chapter of ISA
Sponsor: Pacific Northwest Chapter of ISA
Description: Tree risk assessment is an area of urban forest management that has evolved rapidly in the past decade. We have moved from simple hazard tree assessment concepts into a more sophisticated understanding of risk in general. With the introduction of the ISA’s Best Management Practices document for Tree Risk Assessment, and the Tree Risk Assessment Qualification (TRAQ), several new approaches and guidelines have been introduced. Within the field of tree risk assessment there are many techniques and concepts to master; from basic principles through to sophisticated diagnostic techniques.

This course will focus on Level Three advanced tree risk assessment, but will also link this to Levels One and Two to show when Level Three may be required, and how to relate it to other work.

This course will be delivered by Dr. Julian Dunster, the designer of the original Certified Tree Risk Assessor credential (TRACE) and author of the new ISA Tree Risk Assessment manual for the TRAQ course. The course will be of interest to anyone practicing tree risk assessment, and especially arborists already holding the Tree Risk Assessment Qualification.
Levels of Assessment

Review how each level feeds into the next one to provide increasing levels of detail.
The Implications of Advanced Assessment: An Overview

why do you need it?
asking the right questions
knowing what to look for
knowing what you are looking at
professional and legal implications

Knowing What to Look For

baselines: the biological and mechanically ‘perfect’ tree
variations around ‘perfection’ and what they might mean
Knowing what you are looking at
Body Language: how to read and interpret it
Theorising ideas about what any one variation might mean
How to test your theory and see if you are right

Testing Techniques

Invasive versus non-invasive issues
core sampling
Micro resistance drilling
sonic tomography
Interpreting the results, and relating these back to the risk assessment

Documenting and Defending the Results

The importance of clearly documenting the thought processes that lead you to undertake a Level Three assessment. Showing where, why and how you tested, and what you concluded based on the results.
Class Session Discussion of Real World Examples

Participants are encouraged to submit beforehand a brief outline of a case study about investigations or anomalies they have encountered (details will be provided with the registration information). Up to six of these will be selected for presentation and discussion in class. We will examine the basic issues and then decide what we would have done, and how we might have interpreted the issues to arrive at a conclusion. Submission are to be made directly to Dr. Julian Dunster, with the following subject title 'Case Study Submission - Advanced Tree Risk Assessment - September 19', and to the following email address:

Location: UW Center for Urban Horticulture, 3501 NE 41st Street, Seattle, WA

9:00 to 10:00 Introduction
10:00 to 10:15 Break
10:15 to 11:15 Biomechanics Part 1
11:15 to 12:15 Biomechanics Part 2
12:15 to 12:45 Lunch
12:45 to 1:45 Testing Protocols
1:45 to 2:00 Break
2:00 to 3:00 Typical Tests
3:00 to 4:00 From Theory to Practice


Dr. Julian Dunster has unique academic and professional qualifications. He is a Registered Consulting Arborist, a Registered Professional Forester, and a Registered Professional Planner, and in addition to two degrees in forestry, he holds a Doctorate in Regional Planning and Resource Development. Julian has over thirty years of hands on experience from assignments all over the world, and his innovative work has been recognized with many awards. Julian uses these qualifications and expertise to provide you with practical, science based information, combined with a pragmatic unders
Contact Name: Margo Thorp
Contact Phone: 8003354391
Contact Email:

Seats Available: 25
CEUs available: Yes

Start Date: 9:00 AM, September 19, 2019
End Date: 4:00 PM, September 19, 2019

Address: University of Washington - Center for Urban Horticulture
3501 NE 41st Street
108 Events