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ASCE LID Conference September 26, 2011

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 Conference September 26, 2011

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  1. ASCE LID ConferenceSeptember 26, 2011 Seattle’s Green Stormwater Infrastructure for CSO Reduction Program

  2. Seattle’s Drainage and Wastewater System

  3. History Sets Context for CSO Control

  4. 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 4

  5. CSO Control Approaches

  6. 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.

  7. CSO Reduction -Leading with Green: What • Private Parcels: RainWise • Alleys: retrofitted with permeable pavement • Roadways: Retrofit with roadside rain gardens

  8. GSI for CSO Reduction - Leading with Green: Where

  9. 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

  10. How Much GSI planned to be implemented by SPU in next 5 years?

  11. 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 11

  12. 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

  13. Questions? Tracy Tackett GSI Program Manager Seattle.gov/util/greeninfrastructure City of Seattle Seattle Public Utilities Ray Hoffman, Director

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