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Parking Forest Tree Needs

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The Parking Forest is an assembly of materials to incorporate trees and stormwater management into parking lots without losing parking spaces. This presentation was presented by Todd Prager of Prager …

The Parking Forest is an assembly of materials to incorporate trees and stormwater management into parking lots without losing parking spaces. This presentation was presented by Todd Prager of Prager & Associates and is posted with his permission.

Published in: Design, Technology, Business

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  • 1. How Much Soil Does a Parking Lot Tree Need? Contact: Todd Prager, AICP, ISA Certified Arborist Phone | 971.295.4835 Email | todd@toddprager.com
  • 2. Trees Need Soil to Grow Graph Source: USDA Forest Service Center for Urban Forest Research
  • 3. Soil Volume & Crown Diameter 10 ft Crown 100 cu ft Soil 21 ft Crown 500 cu ft Soil Source: Casey Trees 30 ft Crown 1,000 cu ft Soil
  • 4. Soil Volume & Crown Diameter 20 ft Crown 450 cu ft Soil 5 ft Crown 40 cu ft Soil 40 ft Crown 2000+ cu ft Soil Source: Real World, Tigard
  • 5. Soil Volume & Crown Diameter Source: Real World, Tigard
  • 6. Tree Roots Don’t Generally Grow Under Pavement http://www.flaroccaandsons.com/images/COM/lg/60,000-sf-Parking-Lot-Paving-4.gif Pavement Profile AC surface Aggregate base Subgrade Compaction requirements (90%-95% Proctor Density) are root limiting
  • 7. Tree Roots Don’t Generally Grow Under Pavement Graph Source: Up by Roots, James Urban
  • 8. When Tree Roots Grow “Out of the Box” AC surface Aggregate base Subgrade Roots growing in base layer lifting curb and asphalt
  • 9. Options for Tree Roots Under Pavement
  • 10. Options for Tree Roots Under Pavement
  • 11. Options for Tree Roots Under Pavement Structural Soil Source: Deep Root– Silva Cell - http://www.deeproot.com
  • 12. Options for Tree Roots Under Pavement Structural Soil Source: Cornell University – CU Structural Soil - http://www.hort.cornell.edu
  • 13. Options for Tree Roots Under Pavement Comparison after 10 years of growth Olympia, WA Control Trees Trees with Structural Tree Soil
  • 14. Canopy Deficient Commercial/Industrial Zones Branching Out: Urban Forest Planning
  • 15. Canopy Deficient Commercial/Industrial Zones Branching Out: Urban Forest Planning
  • 16. Canopy Deficient Commercial/Industrial Zones Branching Out: Urban Forest Planning
  • 17. Parking Lot Greening Existing Citywide Canopy (2007) – 25% Citywide Canopy Goal (2047) – 40%
  • 18. Parking Lot Greening 30% Canopy Min. Per Parking Lot & 1000 cu ft Soil Volume Min. Per Tree Branching Out: Urban Forest Planning
  • 19. Soil Volume Strategies
  • 20. Soil Volume Strategies
  • 21. Soil Volume Strategies
  • 22. Questions? Contact: Todd Prager, AICP, ISA Certified Arborist Phone | 971.295.4835 Email | todd@toddprager.com