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2010 07-16 orcca minicharrette - copy

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This is a smaller, low res version of the PowerPoint presentation created for the ORCCA mini-ecocharrette meeting on Jul 15, 2010.

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2010 07-16 orcca minicharrette - copy

  1. 1. ORCCA Mini-charrette meeting Jul 16, 2010 Courtesy of Scott Edwards Architecture
  2. 2. The Water Balance Model: typical for Cascadia Water Quantity Before 16.5” interflow (infiltration) 26” evapo- transpiration 0.2” runoff 65” rainfall yearly avg 22” groundwater (infiltration)
  3. 3. The Water Balance Model Water Quantity After 0” baseflow (infiltration) reduced evapo- transpiration 63” runoff 65” rainfall yearly avg 2” evapo- transpiration Reduced infiltration
  4. 4. Impervious Surfaces A Watershed Perspective
  5. 5. The Water Balance Model Water Quality Before Some sediment
  6. 6. The Water Balance Model Water Quality After Sediment (air particulates), dissolved pollutants (nitrogen, zinc), heavy metals, Feces, Temperature, other debris Sediment/turbidity, Hydrocarbons, Heavy metals, temp, feces, other chemicals Sediment/turbidity fertilizers, pesticides herbicides, feces, heavy metals
  7. 7. Air
  8. 8. Soil Image from Soil Quality Information Sheet , U.S. Department of Agriculture
  9. 9. B est M anagement P ractice s (aka BMPs) Two Types N
  10. 10. ORCCA’s Priority List – reorganized FILTRATION <ul><li>Bioretention/rain gardens </li></ul><ul><li>Vegetated swales </li></ul><ul><li>Vegetated filter strips </li></ul><ul><li>Wetland preservation </li></ul>
  11. 11. Structural BMPs Infiltration and Water Quality <ul><li>Water quality benefits of infiltration techniques from the “National Pollutant Removal Performance Database for Stormwater Treatment Practices” Center for Watershed Protection, June 2000 </li></ul>Pollutant Infiltration SW Wet-land Wet Pond Filtering WQ Swale Dry Pond Total Phosphorus 70 49 51 59 34 19 Soluble Phosphorus 85 35 66 3 38 -6 Total Nitrogen 51 30 33 38 84 25 Nitrate 82 67 43 -14 31 4 Copper N/A 40 57 49 51 26 Zinc 99 44 66 88 71 26 Total Suspended Solids 95 76 80 86 81 47
  12. 12. ORCCA’s Priority List – reorganized RUNOFF REDUCTION <ul><li>Infiltration </li></ul><ul><li>Trenches </li></ul><ul><li>Rain gardens & other vegetated treatment systems </li></ul><ul><li>Porous pavement </li></ul><ul><li>Disconnected downspouts </li></ul><ul><li>Evaporation </li></ul><ul><li>Eco-roof </li></ul><ul><li>Reuse </li></ul><ul><li>Cisterns for parking lot, street, sidewalk, and roof storage </li></ul><ul><li>Additional suggestions: </li></ul><ul><li>Limit disturbance </li></ul><ul><li>Save trees </li></ul>
  13. 13. Infiltration trenches are a UIC not recommended for our timeline
  14. 14. Rain Gardens
  15. 15. Other vegetated systems: Planters
  16. 16. Other vegetated systems: Vegetated Filter Strips
  17. 17. Pervious pavements: Use with CAUTION here POROUS ASPHALT IN 1- 2” LIFT UNCOMPACTED SUBGRADE NON-WOVEN PROPYLENE GEOTEXTILE 12” 1-1/2” to 1” WASHED CRUSHED AGGREGATE 3”
  18. 18. Downspout Disconnection
  19. 19. Eco-roofs
  20. 20. Cisterns for parking lot, street, sidewalk, and roof storage
  21. 21. ORCCA’s Priority List – additional BMPs RUNOFF REDUCTION <ul><li>Trellises and other vertical vegetation </li></ul><ul><li>Limit disturbance </li></ul><ul><ul><li>In Planning </li></ul></ul><ul><ul><li>Save a tree in design </li></ul></ul><ul><ul><li>In construction </li></ul></ul><ul><li>Minimize impervious surfaces </li></ul>
  22. 22. Trellises & other vertical vegetation
  23. 23. Trellises & other vertical vegetation
  24. 24. Limit Disturbance in Planning
  25. 25. Limit Disturbance in Design Save a Tree
  26. 26. Limit Disturbance Construction Practices
  27. 27. Limit Disturbance Construction Practices: Don’t cement treat the soil
  28. 28. Minimize impervious surfaces
  29. 29. ORCCA’s Priority List – reorganized STORAGE (aka Peak Flow Attenuation) <ul><li>Caution: Storage for peak flow attenuation is not necessarily LID but will help us argue against the detention pipe. </li></ul><ul><li>Depressional storage in landscape islands and in tree, shrub, or turf depressions = runoff reduction through infiltration and treatment </li></ul><ul><li>Storage in wetland </li></ul><ul><li>Compost amendment and other soil restoration practices </li></ul>
  30. 30. Storage in wetland at Oleson Woods Apts
  31. 31. ORCCA’s Priority List: additional BMPs STORAGE (aka Peak Flow Attenuation) <ul><li>Compost amendment and other soil restoration practices </li></ul>
  32. 32. Compost Amendment & other soil restoration practices Photos on left are from Soils for Salmon website
  33. 33. ORCCA’s Priority List – reorganized CONVEYANCE <ul><li>Eliminate curbs & gutters </li></ul><ul><li>Swales </li></ul><ul><li>Roughening surfaces </li></ul><ul><li>Long overland flow paths over landscaped areas </li></ul><ul><li>Installing smaller culverts, pipes, & inlets </li></ul><ul><li>Creating terraces and check dams </li></ul>
  34. 34. Eliminate curb & gutter
  35. 35. Eliminate curb & gutter
  36. 36. Swales & daylighting
  37. 37. Swale & Daylighting Details
  38. 38. Swale & Daylighting Details
  39. 39. Check dams
  40. 40. ORCCA’s Priority List: additional BMPs CONVEYANCE <ul><li>Don’t impede subsurface flows. </li></ul><ul><li>Use treatment trains to extend the life of the vegetated facilities. </li></ul>
  41. 41. Transportation BMPs Traffic calming woonerf Photo from Techniques for Urban Sustainability website
  42. 42. Additional BMPs: Source Control
  43. 43. Additional BMPs Source Control in Construction
  44. 44. Additional BMPs Source Control in Construction Photo excerpted from “BMPs for Stormwater Discharges Associated with Construction Activities”, DEQ, Feb 2006
  45. 45. Additional BMPs Source Control in Construction Photos and study and text excerpted from “BMPs for Stormwater Discharges Associated with Construction Activities”, DEQ, Feb 2006
  46. 46. Additional BMPs Source Control Post Construction
  47. 47. Biodiversity
  48. 48. Siting Consideration N
  49. 49. Additional BMPs discussed but no photos <ul><li>More landscape practices </li></ul><ul><li>Water use </li></ul><ul><li>Source control </li></ul><ul><li>Materials </li></ul><ul><li>Operations & Maintenance </li></ul><ul><li>Social Goals </li></ul><ul><li>Passive Solar Design </li></ul><ul><li>Construction Management </li></ul>
  50. 50. ORCCA Mini-charrette meeting Jul 16, 2010 Sustainability for all the places between the buildings.

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