Why low impact development pccpac
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Why low impact development pccpac



Presentation to the Pacific City Woods CPAC on 4/16/2011. Please contact author for permission to use all or part of this presentation.

Presentation to the Pacific City Woods CPAC on 4/16/2011. Please contact author for permission to use all or part of this presentation.



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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.
  • Gardeners: what’s wrong with this beautiful image?
  • 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
  • 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.

Why low impact development pccpac Why low impact development pccpac Presentation Transcript

  • What’s so Bad about Stormwater&What Does Low Impact Development Do About It?
    Robert Emanuel, Ph.D.
    Oregon State UniversityOregon Sea Grant Extension
  • “We forget that the water cycle and the life cycle are one.” --Jacques Cousteau
  • Where is your community in the watershed?
  • Puget Sound Action Team, WSU Pierce County Extension
  • Puget Sound Action Team, WSU Pierce County Extension
  • Video by Laura James, Seattle, WA
  • Photo: Motoya Nakamura/The Oregonian
  • Impacts of Conventional Approaches
    • Water quantity: too much too fast
    • Water quality: the stormwater superhighway for non-point pollutants
    • Costs: O & M, combined sewer overflows, etc.
  • More Runoff
    Arriving Faster
    Flooding and Urban Development
    Flow Rate, cfs
    Time, hours
  • Water Quantity Impacts: Flooding & Erosion
  • Stormwater Pollutants
    • Suspended solids/sediments
    • Nutrients (nitrogen, phosphorus)
    • Metals (copper*, lead, zinc, cadmium, mercury)
    • Oil & grease*
    • Cleaning chemicals
    • Detergents or soaps
    • Bacteria
    • Pesticides*
    • Increased temperature
    *Recent studies show link between these pollutants and salmonid olfactory disorientation and pre-spawning mortality.
  • The Impervious Surface Budget
    Parking Lots
    65% transportation
    35% structures
    Derived from the City of Olympia, WA ISRS Final Report
  • Low Impact Development plans, ordinances, and best management practices
    To better protect our watersheds
    To reduce infrastructure costs
    To make our communities more attractive
  • Slide: Chesapeake NEMO
  • Slide: Chesapeake NEMO
  • Slide: Chesapeake NEMO
  • Slide: Chesapeake NEMO
  • Slide: Chesapeake NEMO
  • Slide: Chesapeake NEMO
  • Slide: Chesapeake NEMO
  • Pringle Creek Development in Salem
  • Kensington Estates
    Total acres: 23.92
    Lots: 103 (4,143 ft2ave.)
    Open space: 15 acres (63%)
    Effective impervious area: ~ 0 %
  • Kensington Estates Cost Comparison
  • Slide: Chesapeake NEMO
  • Site Practices
    Slide: Chesapeake NEMO
  • © Good Nature Publishing
  • A rain garden is a “sunken garden bed” that collects & treats stormwater runoff from rooftops, driveways, sidewalks, parking lots & streets.
    Graphic: EMSWCD
  • How a Rain Garden Works
    Graphic: EMSWCD
  • New Seasons-Interstate, Portland OR
  • Portland Community College, Portland OR
  • Bay City, OR
  • Port Orford, OR
    Photo: Frank Burris, OSU
  • Glencoe Elementary School, Portland, OR
  • Photo by Tom Liptan, City of Portland Environmental Services
  • Photo Koch Landscape Architecture, City of Portland Environmental Services
  • http://www.asla.org/awards/2007/07winners/517_nna.html
  • NE 36th and Emerson, Portland
    Courtesy of Blossom Earth Works
  • Humboldt Gardens, N Vancouver Ave, N Portland
  • Moving water across a sidewalk
    Photo courtesy of Portland Environmental Services
  • Sandy Blvd, Portland OR
  • Other Practices
  • Gravel Wetland
  • Green Street Planters
    SW 12th @ Montgomery (PSU)
  • Rogue Valley Sewer Services
    Pringle Creek, Salem, OR
  • Shorebank Pacific, Ilwaco, WA
  • Alternatives to Pavement
    overflow parking
    conventional parking
  • SeQuentialBiofuels, Eugene, OR
  • Photo Robert Emanuel
  • Photo Derek Godwin
  • Planter Boxes and Street Trees
    Photo Robert Emanuel, OSU
  • What do these strategies cost?
    What strategies yield greatest benefits?
    What strategies help build resilience?
  • Not all pollution is the same:
    Site Planning/Land Use
    Controlling Sources
    Site-level Practices
  • How to Make All of This Happen
    Pass stormwater management regulation
    Re-examine local land use controls
    Permit and promote open-space developments
    Use landscape features instead of infrastructure
    Create demonstration projects
  • Robert Emanuel, Ph.D.OSU Extension Service FacultyWater Resources & Community Development 2204 Fourth StreetTillamook, OR 97141(503) 842-5708 X 210robert.emanuel@oregonstate.edublogs.oregonstate.edu/h2onc/