Green Stormwater Infrastructure: The Basics
Transcript of Green Stormwater Infrastructure: The Basics
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Green Stormwater Infrastructure:
The Basics
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Overview
Seattle Stormwater Challenges
Green Infrastructure Tools
Evolution of Green Infrastructure in Seattle
Looking Ahead
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Stormwater Challenges
Flooding/ Inadequate
Conveyance
Urban Creeks -
Erosion and Habitat
Water Quality-
Stormwater and
Sewer Overflow
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Tries to make …function more
this… like this.
Green Stormwater Infrastructure
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Green Stormwater Infrastructure
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Bioretention (Rain Garden)
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Permeable Pavement
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Rainwater Harvesting / Cisterns
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Trees
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Vegetated Roofs
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Proven method for managing stormwater
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Growing the Program: Building GSI Experience and Knowledge
Project Project Drainage
Area
SEA Street #1 2 acres
Carkeek Cascade 28 acres
Broadview Natural Drainage System 32 acres
Pinehurst Natural Drainage System 49 acres
High Point 129 acres
Thornton Creek Water Quality Project 660 acres
Ballard Roadside Rain Gardens 3 acres
Swale on Yale 435 acres
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The Beginning of GSI in Seattle:
SEA Street
2001 Pre-project
• Achieved
99% reduction
in runoff
• Treated local
runoff only
• Added formal
drainage
system and
sidewalk
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Broadview and Pinehurst
Natural Drainage Systems
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Porous Pavement
High Point
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Ballard Roadside Rain Gardens Pilot
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Ballard
Roadside Rain Gardens
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Lessons Learned
• Conduct thorough technical work up front
• Understand the Community Context
• Timely, Clear and Transparent Community
Engagement
• Be prepared to adjust to site conditions during
construction
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Capitol Hill Water Quality Project/ Swale on Yale
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Seattle’s Stormwater Code Requires GSI
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Incentives for Voluntary Use: RainWise
www.rainwise.seattle.gov
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Why GSI in the Urban Drainage Strategy?
Many benefits beyond better water
quality
• New small-business opportunities;
• Flexible responses to adapt to climate
change;
• Groundwater recharge;
• Improved neighborhood streetscapes
• Opportunity for residents and
businesses to help through actions
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GSI Strategies Going Forward
• Meet regulatory
requirements
• Require during
redevelopment and new
development
• Partner in City projects
and programs to meet
multiple goals
• Incentives for voluntary
use
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Questions?
City of Seattle
Seattle Public Utilities Ray Hoffman, Director
Tracy Tackett
GSI Program Manager
www.seattle.gov/util/greeninfrastructure