building stormwater/wastewater utilities resilient to ... · alt 2 – best under worst case...
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Building Stormwater/Wastewater Utilities Resilient to Climate Change
Alice Brawley-Chesworth, PE
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You Know Your Assets
Don’t wait for science to be definitive “Bottom Up”
approach Don’t forget
natural infrastructure
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Sea Level Rise Coastal Communities Inland; Willamette tidally influenced
downstream of Willamette Falls
Assets in / near floodplains pipes, pump stations, outfalls, natural infrastructure
Groundwater Levels?Constructibility, UICs
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Extreme weather & Increased winter precipitation
Erosion and turbidity Landslides Electrical outages/price fluctuations More flow to stormwater facilities UICs, greenstreets, swales, pipes, natural
infrastructure (including newly restored areas)
Vegetation/habitat/wildlife shifts
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Higher summer temperatures
Water quality Algae & bacterial growth, changes in chemistry
Water temperatures Treatment process changes, fish survival, odor
Soil temperatures Soil corrosivity, groundwater quality
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Higher Temperatures & Decreased rainfall in summer
Fire danger Water supply disruption Lower summer streamflows Change assumptions for NPDES permits?
Vegetation/habitat/wildlife shifts Increased invasive species & waterborne
diseases Natural areas, greenstreets, stream restoration
areas
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Surprise!
You’re (probably) already adapting Stream restoration Green infrastructure Odor control Resource efficiency Invasives removal
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Adaptation Category 1:Institutionalize Adaptation
Build internal expertise Periodic updates: What’s everyone else doing? Latest research? Lessons learned? New regulations?
Identify adaptation actions with benefits across sectors Identify research gaps
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Adaptation Category 2:Asset Planning
Climate is one of many risks Planning Study – include climate risks Preliminary Design – use up to date science
and data Materials Selection Vegetation Building materials
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Adaptation Category 2:Asset Planning
Cost/Benefit analysis example: Alt 1 – best under existing conditions Alt 2 – best under worst case climate conditions Alt 3 – good under a broad range of future
climate conditions
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Adaptation Category 2:Asset Planning
Cost/Benefit analysis example: Alt 1 – best under existing conditions Alt 2 – best under worst case climate conditions Alt 3 – good under a broad range of future
climate conditions **** Most resilient
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Adaptation Category 3:Emergency Planning
Floods Landslides Wildfires Power outages Water supply disruptions Vector-borne disease
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Adaptation Category 4:“No Regrets Actions”
Prioritize for your needs Resource Efficiency (Mitigation too!) Accelerate Existing Programs (add fuel to the
fire) Re-examine Existing Programs (small changes
have big impact?) New Programs (have benefits besides climate
adaptation?)
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Adaptation Category 5:Indicators and Monitoring
Data Gaps Temperature vs. odor complaints? Sediment in pipes vs. storm intensity? Watershed health indicators?
Continue Monitoring Design storm
CSO, SSO, stream restoration, floodplain restoration River levels Species survival
Performance of Adaptation Actions
