Lid Stormwater Approach: Overcoming Barriers to Implementation

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Presented October 4, 2011 at a brownbag discussion on the upcoming Phase 1 and Phase 2 Municipal Stormwater Permit changes to incorporate LID.

Presented October 4, 2011 at a brownbag discussion on the upcoming Phase 1 and Phase 2 Municipal Stormwater Permit changes to incorporate LID.

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  • Compaction was a major concern over the entire lot. Contractor was instructed to keep 1-ft minimum of soil above final grading until ready to install detention and pavement in order to preserve infiltrative capacity of underlying soils.

Transcript

  • 1. LOW IMPACT DEVELOPMENT STORMWATER APPROACH
    Overcoming Barriers to Implementation
  • 2. Brickyard Park and Ride
    May 2009
    June 2010
    Project is a 200 stall expansion of an existing King County Metro Park and Ride lot located in unincorporated King County.
  • 3. Stormwater Management Approach
    Pervious asphalt pavement with distributed detention storage in shallow arch-pipe system. Biofiltration swale for WQ treatment.
    n
  • 4. Topography and Groundwater
  • 5. Brickyard: Drainage Section
    Arch pipe detention system section
  • 6. 60% Design Cost Comparison
    Cost Savings = $88,000 or 3.8% of Construction Cost
    Cost Assumptions:
    Subtract 8 CBs and 630 LF of 12-inch pipe
    Decrease detention storage by about ½ or 16,000 cubic feet
    Decrease earthwork cut and haul (due to less detention storage)
    Add washed crushed base course material
  • 7. Construction
  • 8. Paving Day – August 28, 2009
  • 9. Completed Paving
  • 10. When Something Goes Wrong
  • 11. Repairs
  • 12. Common Barriers to Use of LID
    Unfamiliarity
    Design team, permitting agency, owner, contractor, etc.
    Do you have public support for your ROW project?
    Site limitations (soils, slopes, high groundwater, etc.)
    Cost (perceived and/or real)
    Local code limitations
    Risk/Liability (both to owner and design team)
  • 13. Risk Mitigation
    Take Advantage of Continuing Professional Education
    LID Certification Classes are offered locally
    Webinars – Contract Language/Risk Management
    Attend Professional Conferences – ASCE International Conference on LID
    Start Small to Build Confidence and Experience
    Seek Highly Collaborative Project Teams
    LID methods require an understanding of natural systems that include the surrounding ecology, soil, and plant communities. This requires close collaboration of people across disciplines (architect, civil, geotech, landscape architect, environmental scientist, etc.)
    Partner with suppliers and builders early in design to increase success
  • 14. Amie Broadsword, PE, LEED AP
    amieb@paceengrs.com
    425-827-2014
    A Special Thank You to Today’s Sponsors!