Date post: | 12-Jan-2016 |
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Introduction to STRATUM Model and Application
What makes STRATUM different?
Street trees, not entire urban forest Costs, not only benefits Management tool, not only for advocacy Tree inventory-based, not GIS Answers the question: do the accrued
benefits of street trees outweigh the cost of their management?
StructureStructure
FunctionFunction
ValueValue
Management Management NeedsNeeds
The Foundation: Reference City Research
Regional Tree Guide studies to develop growth models of representative street trees and their dimensions as a basis for Benefit-Cost Analysis.
Reference City Research
Collected local street tree data
Analyzed growth rates and dimensions
Estimated magnitude of annual benefits
Priced benefits Priced tree care costs Calculated net annual
benefits, benefit-cost ratios
Tree Size, Growth, and Functionality
Sweetgum
0
2
4
6
8
10
12
14
16
18
20
0 5 10 15 20 25 30 35 40 45 50
Years
Bo
le &
To
tal
He
igh
t (m
)
Santa Monica
Modesto
Claremont
70%40% 26%
Sweetgum in three climate zones at age 40
Inland Empire Coastal S. CA Central Valley
Research Process— Benefits
Heating & Cooling Energy - Regional market prices ($0.095/ kWh, $0.97/therm)
Carbon trading credits - CO2 ($15/ton)
Air Pollutants - Transaction costs, damage value and control cost of emissions ($1-15,000/ton)
Stormwater Runoff - Retention/detention costs ($0.005/gal)
Residential Property Increase - Average resale price (median sales price = $254,000)
Research Process—Costs
Planting Pruning Removal and disposal Pest and disease control Irrigation Infrastructure Leaf litter cleanup Liability Administration
The STRATUM Application
Define Costs
Define City
Define Benefit Prices
StructureStructure
FunctionFunction
ValueValue
Management Management NeedsNeeds