Introduction to STRATUM Model and Application

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• Introduction to STRATUM Model and Application

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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?

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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.

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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

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Tree Size, Growth, and Functionality
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Sweetgum in three climate zones at age 40
Inland Empire Coastal S. CA
Central Valley
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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)

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Research ProcessCosts

• Planting
• Pruning
• Removal and disposal
• Pest and disease control
• Irrigation
• Infrastructure
• Leaf litter cleanup
• Liability
• Administration

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The STRATUM Application
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? Define City
Define Costs ?
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• Define Benefit
• Prices

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