Parking Forest to ASCE

317 views

Published on

Overview of two pilot projects of the Parking Forest, an assembly of common materials used to increase tree canopy and manage stormwater in parking lots without losing parking spaces.

Published in: Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
317
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
2
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide
  • Silva Cells are an commercially produced support structure made of plastic for under pavement. The matrix is filled with a soil mix appropriate for trees. Silva cells have an advantage over structural soils in that 92% of the volume can be filled with planting medium, compared to something on the order of 22% for structural soils.
  • Parking Forest to ASCE

    1. 1. The Parking Forest: Linear Tree Wells Using Structural Soil 503.334.8634 www.greengirlpdx.com greengirl@greengirlpdx.com a certified women business enterprise Sustainability for all the places between the buildings
    2. 2. Clean Water Services Healthy Streams Plan Main Street Tigard
    3. 3. Effective Impervious Area within the Tualatin Basin UGB 8% Source: Clean Water Services Healthy Streams Plan
    4. 4. 50% evaporation 100% XX” average annual rainfall Why do we need more trees in the urban fabric? Water Balance BEFORE Development 25% groundwater (deep infiltration) 0.5% runoff
    5. 5. reduced evaporation 2% evaporation 98% runoff No infiltration Reduced infiltration 100% average annual rainfall Water Balance AFTER Development Example: EVERYWHERE
    6. 6. Water Balance Runoff Compared 0.5% runoff 98% runoff
    7. 7. Hydromodification from a Watershed Perspective Please! Keep your runoff volume to yourself! • Additional volumes result in exceeding predeveloped rates that scour stream banks. • Additional durations of flow impact habitat further.
    8. 8. What’s wrong with the trees we’ve got?
    9. 9. What’s wrong with the trees we’ve got?! Photo Source: gratefulmommy.com
    10. 10. What about all those lovely tree-lined streets in Portland?
    11. 11. Trees Need Soil to Grow Graph Source: USDA Forest Service Center for Urban Forest Research Slide courtesy of Todd Prager ,Todd Prager & Associates
    12. 12. Trees Need Soil to Grow 5 ft Crown 40 cu ft Soil 20 ft Crown 450 cu ft Soil 40 ft Crown 2000+ cu ft Soil Photos and observations courtesy of Todd Prager, Todd Prager & Associates
    13. 13. The Parking Forest An Assembly of Common Materials
    14. 14. The Parking Forest A Close Up Crushed aggregate Tree Re-paved area Pavement outside of Parking Forest Wheel stop Undisturbed native clayey soil Amended native clayey soil Structural Structural Soil Soil (dry)
    15. 15. Two Sites Redevelopment Retrofit Watershed base map courtesy of Tualatin River Watershed Council
    16. 16. THPRD Sunset Swim Center Redevelopment with Pervious Concrete
    17. 17. THPRD Sunset Swim Center in Plan Redevelopment with Pervious Concrete
    18. 18. Structural Soil Our “Secret Weapon” Source: Cornell University – CU Structural Soil - http://www.hort.cornell.edu
    19. 19. How do we know it works? Olympia Results 8 Years Later Control Trees Planted in Compacted Native Soil Trees Planted in Structural Soil
    20. 20. Assembly Procedure
    21. 21. Assembly Procedure
    22. 22. Assembly Procedure
    23. 23. Assembly Procedure
    24. 24. Assembly Procedure
    25. 25. Assembly Procedure
    26. 26. Assembly Procedure
    27. 27. Assembly Procedure
    28. 28. Why these materials? • • • • • Structural soil Amended Native Soil Trees Wheel stops Crush rock (in landscape area)
    29. 29. Why these materials? Structural Soil • Structural soil versus structural supports
    30. 30. A Second Way of Providing Tree Roots with Adequate Soil Volume Under Pavement . Photo courtesy of Jim Labbe
    31. 31. AAnother Way of Providing Tree Roots with Second Way of Providing Tree Roots with Adequate Soil Volume Under Pavement Adequate Soil Volume Under Pavement . Photo courtesy of Jim Labbe
    32. 32. A Second Way of Providing Tree Roots with Adequate Soil Volume Under Pavement Jim Labbe in Nijmegen Netherlands. Photo courtesy of Jim Labbe
    33. 33. A Third Way of Providing Tree Roots with Adequate Soil Volume Under Pavement Photo probably ripped off the Silva Cell website by Brian Wegener
    34. 34. Why these materials? Proprietary mix versus mixed by contractor
    35. 35. Mixing Structural Soil Photo Source: www.greelysand.com/cu-soil.html
    36. 36. Olympia Soil Recipe 4 cubic yards Crushed Rock ¾”-1¼” + 1 cubic yard Loam/organic topsoil + 1 pound Soil Binder “Stabilizer” + 46 gallons water__________ Makes 4.6 cubic yards Structural Soil
    37. 37. Structural Soil Costs - Olympia “The price to supply, deliver and install the structural soil material per cubic yard ranged from $19 to $85 with an average bid of $42, the median price was $39.50. The city paid $24 per cubic yard for the structural soil material to the low bidder. This compare to a price quote we received for the supply of CU structural soil at $65 per cubic yard plus delivery. The source was over an hour’s drive away and delivery charges were $85 per hr with a truck and trailer hauling 22 cubic yard. The expected cost delivered was $72 per cubic yard.” Excerpted from “Structural Soil Demonstration Project” http://olympiawa.gov/~/media/Files/CPD/Urban%20Forestry/Forms/StructuralSoil.as hx Source: City of Olympia -Structural Soil Demonstration Project
    38. 38. Why these materials? Amended native soil Amended native soil versus faster draining “3-way” mix
    39. 39. Why these materials? Trees Trees versus only shrubs &/or groundcover: • Interception & evaporation • Evapotranspiration • Heat island effect
    40. 40. Why these materials? Wheel stops Wheel stops versus curbs
    41. 41. Why these materials? Crushed rock ¼”x 10 crushed rock versus rounded rock or pavers
    42. 42. Siting Criteria • Site is suitable for infiltration • Non-expansive soils • Soils should infiltrate at least 0.2 inches/hour*. Clay soils are OK! *Based on 2ft of structural soil, 25% void ratio, facility empty in 30 hours to be ready for the next Type IA storm
    43. 43. PCC Sylvania Lot 10 Drainage Area Parking Lot 1919 sf Sidewalk 754 sf <50% Grass HSG C 615 sf Woods, Good HSG C 2815 sf 6103 sf 6133 sf
    44. 44. PCC Sylvania Lot 10 in Plan
    45. 45. The Parking Forest Retrofit at PCC Sylvania Lot 10 Ignore the piles of dirt. They’re gone.
    46. 46. Design Differences at PCC Sylvania Lot 10 Installed an impervious liner adjacent to impervious asphalt Stakeholders chose a native conifer Left most of the parking lot unmodified/ impervious
    47. 47. Water quality and quantity monitoring
    48. 48. Design Differences at PCC Sylvania Lot 10 Straight headin parking Just trees Donated “old school” solid bottom wheel stops = not ideal
    49. 49. Erosive forces are an issue at PCC
    50. 50. Non-attentive forces are an issue at PCC
    51. 51. Thank You! Partners Who Donated In-Kind Services/Products Alder Geotechnical Services
    52. 52. Siting Criteria at PCC • Site is suitable for infiltration • Non-expansive soils • Soils should infiltrate at least 0.2 inches/hour*. Clay soils are OK! *Based on 2ft of structural soil, 25% void ratio, facility empty in 30 hours to be ready for the next Type IA storm
    53. 53. More Information www.parkingforest.org • • • • • • • • • • Partners Benefits Design Criteria Specifications Plans & Details Monitoring & Adaptive Management Photo Galleries Additional Resources Press Frequently Asked Questions

    ×