Parking Forest to ASCE

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    12-May-2015
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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.

Transcript of Parking Forest to ASCE

  • 1.The Parking Forest: Linear Tree Wells Using Structural Soil503.334.8634 www.greengirlpdx.com greengirl@greengirlpdx.com a certified women business enterprise Sustainability for all the places between the buildings

2. Clean Water Services Healthy Streams PlanMain Street Tigard 3. Effective Impervious Area within the Tualatin Basin UGB8%Source: Clean Water Services Healthy Streams Plan 4. 50% evaporation100% XX average annual rainfallWhy do we need more trees in the urban fabric? Water Balance BEFORE Development25% groundwater (deep infiltration)0.5% runoff 5. reduced evaporation2% evaporation98% runoffNo infiltrationReduced infiltration100% average annual rainfallWater Balance AFTER Development Example: EVERYWHERE 6. Water Balance Runoff Compared0.5% runoff98% runoff 7. Hydromodification from a Watershed PerspectivePlease! 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. Whats wrong with the trees weve got? 9. Whats wrong with the trees weve got?!Photo Source: gratefulmommy.com 10. What about all those lovely tree-lined streets in Portland? 11. Trees Need Soil to GrowGraph Source: USDA Forest Service Center for Urban Forest Research Slide courtesy of Todd Prager ,Todd Prager & Associates 12. Trees Need Soil to Grow5 ft Crown 40 cu ft Soil20 ft Crown 450 cu ft Soil40 ft Crown 2000+ cu ft SoilPhotos and observations courtesy of Todd Prager, Todd Prager & Associates 13. The Parking Forest An Assembly of Common Materials 14. The Parking Forest A Close Up Crushed aggregateTreeRe-paved area Pavement outside of Parking ForestWheel stopUndisturbed native clayey soilAmended native clayey soilStructural Structural Soil Soil (dry) 15. Two SitesRedevelopmentRetrofitWatershed base map courtesy of Tualatin River Watershed Council 16. THPRD Sunset Swim Center Redevelopment with Pervious Concrete 17. THPRD Sunset Swim Center in Plan Redevelopment with Pervious Concrete 18. Structural Soil Our Secret WeaponSource: Cornell University CU Structural Soil - http://www.hort.cornell.edu 19. How do we know it works? Olympia Results 8 Years LaterControl Trees Planted in Compacted Native SoilTrees Planted in Structural Soil 20. Assembly Procedure 21. Assembly Procedure 22. Assembly Procedure 23. Assembly Procedure 24. Assembly Procedure 25. Assembly Procedure 26. Assembly Procedure 27. Assembly Procedure 28. Why these materials? Structural soil Amended Native Soil Trees Wheel stops Crush rock (in landscape area) 29. Why these materials? Structural Soil Structural soil versus structural supports 30. A Second Way of Providing Tree Roots with Adequate Soil Volume Under Pavement. Photo courtesy of Jim Labbe 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. A Second Way of Providing Tree Roots with Adequate Soil Volume Under Pavement Jim Labbe in Nijmegen Netherlands. Photo courtesy of Jim Labbe 33. A Third Way of Providing Tree Roots with Adequate Soil Volume Under PavementPhoto probably ripped off the Silva Cell website by Brian Wegener 34. Why these materials? Proprietary mix versus mixed by contractor 35. Mixing Structural SoilPhoto Source: www.greelysand.com/cu-soil.html 36. Olympia Soil Recipe4 cubic yards Crushed Rock -1 + 1 cubic yard Loam/organic topsoil + 1 pound Soil Binder Stabilizer + 46 gallons water__________ Makes 4.6 cubic yards Structural Soil 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 structuralsoil at $65 per cubic yard plus delivery. The source was over an hours 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 Projecthttp://olympiawa.gov/~/media/Files/CPD/Urban%20Forestry/Forms/StructuralSoil.as hx Source: City of Olympia -Structural Soil Demonstration Project 38. Why these materials? Amended native soil Amended native soil versus faster draining 3-way mix 39. Why these materials? Trees Trees versus only shrubs &/or groundcover: Interception & evaporation Evapotranspiration Heat island effect 40. Why these materials? Wheel stops Wheel stops versus curbs 41. Why these materials? Crushed rock x 10 crushed rock versus rounded rock or pavers 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. PCC Sylvania Lot 10 Drainage Area Parking Lot1919 sfSidewalk754 sf