Tree Appraisal Workshop - 2010
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1. Tree Appraisal Workshop
- Verna Mumby
Mumby’s Arboriculture Consulting -Brief history of tree appraisal
- Tools for appraisal and factors in plant appraisal
- Trunk Formula / Cost of Cure / Cost of Repair & other formulae
- Report documentation -Case studies www.treelady.ca
2. •History of Tree Appraisal
- 1800’s to 2000
Europeans began assessing and assigning a monetary value to their trees in the 1800’s.
University of Michigan assigned a value of $5 plus compound interest @ 5% over a 25 year period.
The formula was improved with assistance of the National Shade
Tree Conference and of the National Arborist Association.
Land values removed from the formula. The Location rating was added. The Basic Value was established @ $5/inch2 or $0.78cm2.
- 1800 1905 1957 1905-1938
- 1947
Dr. Stone from U of Massachusetts and Dr. Felt from Barlett Tree
Research Laboratories developed the first valuation format. www.treelady.ca2
3. •History of Tree Appraisal
- 1800’s to 2000
A Guide to the Professional Evaluation of Landscape Trees, Specimen
Shrubs and Evergreens 4th edition was written by the ISA, AAN, ASCA,
NAA and National Shade Tree Conference.
Council of Tree & Landscape Appraisers (CTLA) was developed & included ISA, AAN, ASCA, NAA, NSTC, ALCA
Field report Guide for Trunk Formula developed.
Cost of Cure Field Report Form developed.
CTLA added 2 more associations to their council. Association of
Consulting Foresters &American Society of Landscape Architects.
9th edition published in 2000.
- 1975 1979 1997-2000
- 1979-1992
- 1995
The CTLA wrote 3 more editions. The 8th edition renamed the publication to Guide for Plant Appraisal and included a workbook.
Basic value was now at $27/inch2 or $4.19/cm2. www.treelady.ca3
4. www.treelady.ca4
5. Replacement
- Method
- Trunk Formula
- Compounded
- Replacement Cost method
- Cost of Cure
- Cost of Repair
- Crop Value
- Timber Value
- Market Value
- Cost Approach
- Income Approach
- Market Approach www.treelady.ca5
6. 5 factors to assess on the tree
5 factors to assess on the tree.
Roots / Trunk / Scaffold branches Smaller branches & twigs / Foliage or buds
Scoring System
5: no problem 4: no apparent problem 3: minor problems
2: major problems 1: extreme problems •Conducting an appraisal in the field www.treelady.ca6
7. www.treelady.ca
Site rating : Quality, Design, Appearance & Intensity
Contribution rating: Function, Aesthetics and Benefits
Placement rating : is how effective the tree provides the functions & the aesthetic attributes
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8. •Conducting an appraisal in the field
Tools
- DBH tape
- Clinometer
- Binoculars
- Notebook
- Camera
Identify the tree species. Take a photo. Take a sample.
Measure the diameter @ 1.4 meters from ground level using a diameter tape.
Assess the health of the tree.
Assess the Site / Contribution / Placement factors to determine the Location rating. www.treelady.ca
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9. • Species Rating
- DBH converted to TA and ATA
- Classroom Work www.treelady.ca 9
10. REPLACEMENT PLANT COST
- Wholesale price for the largest transplantable tree of the same species
- 3 prices
- 3 local nurseries
- Transporting the tree
- Planting the tree
- Monitoring the tree and maintaining it
- Guarantee
- Profit margin
- INSTALLATION COSTS
- More classroom work… www.treelady.ca 10
11. Replacement
- Method
- Trunk Formula
- Compounded
- Replacement Cost method
- Cost of Cure
- Cost of Repair
- Crop Value
- Timber Value
- Market Value
- Cost Approach
- Income Approach
- Market Approach www.treelady.ca11
12. (308.33 + 650.00) x (80% x70% x75%) + 250.00 = $652.49
(308.33 + 650.00) x (80% x70% x75%) + 250.00 = $652.49
Rounded up to $660.00 Plant Cost (wholesale):
$308.33 Installation Cost: $650.00 Species Rating: 80%
Condition: 70% Location: 75% Removal Cost: $250.00 www.treelady.ca
Use this method when the tree can be replaced with the same size , in the same location and the same species. Example Green Ash .
- Replacement Method
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13. www.treelady.ca
Determine the replacement and maintenance costs plus the compounded interest for an estimated number of years until the tree reaches parity.
- Compounded
- Replacement Cost method
- Cost of Repair
Determine the cost to repair a tree. These costs could include cabling , bracing, pruning, fertilizing, watering , aeration, wound treatment and plant health care.
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14. www.treelady.ca
- Trunk Formula
Utilize this method when appraising a tree that is too large to replace.
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The treatment necessary to return the property to a reasonable level of its original condition where there has been damage to or loss of trees.
- Remove debris, stumps and clean the site.
- Replace the trees and restore the property to its pre-casualty condition.
- Calculate post -restoration maintenance.
- Cost of Cure
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17. Important points to remember.
- Collect your data correctly.
- Apply the method of appraisal suitable for the situation.
- Be reasonable. www.treelady.ca17
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Report formats and case studies.