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Why Low Impact Development?
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Why Low Impact Development?

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Why implement a Low Impact Development strategy? Because infiltrating and managing stormwater in a way that reproduces native hydrology matters. This talk was presented at a special "Forging the …

Why implement a Low Impact Development strategy? Because infiltrating and managing stormwater in a way that reproduces native hydrology matters. This talk was presented at a special "Forging the Link" workshop for PNW stormwater managers, Vancouver, WA, 3/9/11. Please contact the author before using.

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  • Laura James is a long-time scuba diver who lives in Seattle. James and a couple of buddies took video cameras down to where one West Seattle storm drain empties into Elliot Bay. Taken January 18th, after much of the Pineapple Express dumped a lot of water onto Seattle metro area.
  • In summary, we get three big issues with stormwater and conventional approaches to its management: too much too fast, poor quality water and increasing costs to maintain the system.
  • Emerging evidence that salmon olfactory is damaged. 63 pesticides were found at the source drinking water intake on the Clackamas River, near Portland, Oregon. Glyphosate and its derivative was one of the most frequent pollutants detected. Once invasives are established in an environment, our responsibility is to remove them where possible, but also we should be focusing efforts on preventing them in the first place.
  • Photo: Frank Burris, OSU Extension ServicePort Orford, OR Visitor’s Center Rain Garden
  • Glencoe Elementary School, Portland, OR Photo: Derek Godwin, OSU Extension Service
  • Ask permission of Tom Liptan and BES
  • This is a planter
  • This is a planter
  • Infiltration planter?
  • for an estimated budget of $81M. The green solutions included adding more than 500 green streets with vegetated curb extensions or stormwater planters…
  • Metro Building in Portland—Green roof covering 9,000 sq. ft. of surface and contrasted with rock-ballast roof that covers other 2/3 of total.
  • Transcript

    • 1. Introduction: Why Low Impact Development?
      Robert Emanuel, Ph.D.
      Oregon State UniversityOregon Sea Grant Extension
    • 2. Where is your community in the watershed?
    • 3. Puget Sound Action Team, WSU Pierce County Extension
    • 4. Puget Sound Action Team, WSU Pierce County Extension
    • 5.
    • 6.
    • 7.
    • 8.
    • 9. Video by Laura James, Seattle, WA
    • 10.
    • 11. Photo: MotoyaNakamura/The Oregonian
    • 12. Impacts of Conventional Approaches
      • Water quantity: too much too fast
      • 13. Water quality: the stormwater superhighway for non-point pollutants
      • 14. Costs: O & M, combined sewer overflows, etc.
    • Water Quantity Impacts: Flooding & Erosion
    • 15.
    • 16. Stormwater Pollutants
      • Suspended solids/sediments
      • 17. Nutrients (nitrogen, phosphorus)
      • 18. Metals (copper*, lead, zinc, cadmium, mercury)
      • 19. Oil & grease*
      • 20. Cleaning chemicals
      • 21. Detergents or soaps
      • 22. Bacteria
      • 23. Pesticides*
      • 24. Increased temperature
      *Recent studies show link between these pollutants and salmonid olfactory disorientation and pre-spawning mortality.
    • 25.
    • 26.
    • 27. Low Impact Development plans, ordinances, and best management practices
      To better protect our watersheds
      To reduce infrastructure costs
      To make our communities more attractive
    • 28. Slide: Chesapeake NEMO
    • 29. Slide: Chesapeake NEMO
    • 30. Slide: Chesapeake NEMO
    • 31.
    • 32.
    • 33. Slide: Chesapeake NEMO
    • 34. Slide: Chesapeake NEMO
    • 35. Slide: Chesapeake NEMO
    • 36. Slide: Chesapeake NEMO
    • 37. Pringle Creek Development in Salem
    • 38. Kensington Estates
      Total acres: 23.92
      Lots: 103 (4,143 ft2ave.)
      Open space: 15 acres (63%)
      Effective impervious area: ~ 0 %
    • 39. Kensington Estates Cost Comparison
    • 40. Slide: Chesapeake NEMO
    • 41. Slide: Chesapeake NEMO
    • 42. New Seasons-Interstate, Portland OR
    • 43. Portland Community College, Portland OR
    • 44. Bay City, OR
    • 45. Port Orford, OR
      Photo: Frank Burris, OSU
    • 46. Glencoe Elementary School, Portland, OR
    • 47. Photo by Tom Liptan, City of Portland Environmental Services
    • 48. Photo Koch Landscape Architecture, City of Portland Environmental Services
    • 49. Photo Koch Landscape Architecture, City of Portland Environmental Services
    • 50. http://www.asla.org/awards/2007/07winners/517_nna.html
    • 51. Gravel Wetland
    • 52.
    • 53.
    • 54. Green Street Planters
      SW 12th @ Montgomery (PSU)
    • 55.
    • 56.
    • 57. Rogue Valley Sewer Services
      Pringle Creek, Salem, OR
    • 58. Shorebank Pacific, Ilwaco, WA
    • 59. SeQuentialBiofuels, Eugene, OR
    • 60. Photo Robert Emanuel
    • 61. Photo Derek Godwin
    • 62.
    • 63. Not all pollution is the same:
      Effectiveness
      Site Planning/Land Use
      Source Controls
      Structural BMP’s
    • 64.
    • 65.
    • 66. What do these strategies cost?
      What strategies yield greatest benefits?
      What strategies help build resilience?