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ASCE LID Conference September 26, 2011

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ASCE LID Conference September 26, 2011 Seattle’s Green Stormwater Infrastructure for CSO Reduction Program. Seattle’s Drainage and Wastewater System. History Sets Context for CSO Control . SPU CSO System. 90 Permitted CSO outfalls 37 CSO outfalls do not meet CSO requirements

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ASCE LID ConferenceSeptember 26, 2011

Seattle’s Green Stormwater Infrastructure for CSO Reduction Program

spu cso system
SPU CSO System

90 Permitted CSO outfalls

37 CSO outfalls do not meet CSO requirements

35 CSO Storage Facilities (8.1 Million Gallons)

Approximately 100 million gallons CSO discharge annually

Approximately 200 CSO discharge events annually

Integration with King County

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why including gsi in the urban drainage strategy
Why Including GSI in the Urban Drainage strategy?
  • Citizen interest:
    • Alternative for right-of-way improvements for informal areas
    • reducing environmental impacts on Seattle’s receiving water bodies
  • Providing ratepayers cost-effective solutions that maximize social and environmental benefits
  • Helps toward other City goals: Water conservation, 2030 Challenge (carbon emissions), Seattle Releaf (tree canopy)
  • NOT top down politically driven; staff up.
cso reduction leading with green what
CSO Reduction -Leading with Green: What
  • Private Parcels: RainWise
  • Alleys: retrofitted with permeable pavement
  • Roadways: Retrofit with roadside rain gardens
leading with green
Leading with Green

Legend

Basins with Potential to Fully Control CSOs – Maximum Potential

Basins with Potential to Fully Control CSOs – Most Practical

Basins with Moderate Potential to Reduce Control Volumes

Basins with Low Potential to Reduce Control Volumes

current biggest challenges
Current Biggest Challenges

Program recovery from poor project experience

Clear political support

Clear policy - especially around level of risk tolerated

Public Involvement strategy

Staff hiring freezes

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our duty
Our duty

At a time of economic constraint

  • We must promote multi-functionality and value
  • Try to reduce and manage uncertainty
  • Strive not to try to build our way out of our problems but to use a portfolio of approaches
  • Seek the right balance between social good and enterprise opportunities
  • Engage, engage and engage with those affected, the beneficiaries and the effectors
  • Manage everyone’s expectations

Slice Courtesy of R. Ashely

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Questions?

Tracy Tackett

GSI Program Manager

Seattle.gov/util/greeninfrastructure

City of Seattle

Seattle Public Utilities

Ray Hoffman, Director

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