Greater Green-Duwamish Watershed Water Quality€¦ · Total PCBs in Duwamish River Water at...
Transcript of Greater Green-Duwamish Watershed Water Quality€¦ · Total PCBs in Duwamish River Water at...
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Greater Green-Duwamish Watershed Water Quality
Jim Simmonds
King County Water and Land Resources Division
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This talk
• A little background• Flow flashiness• Temperature• Bacteria• Copper• PCBs• Stream benthos• Coho pre-spawn mortality• Climate change• Summary
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Parcels Built Before
Stormwater Controls Required
About three-fourths of urban lands lack stormwater storage and treatment facilities
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WRIA 9 Population(outside of Seattle)
• 509,000 in 2010
• 637,000 in 2035
• Growth focused in cities
• Mostly urban redevelopment
• Nearly ½ of project area to have new or re-development by 2040 or ~ 1%/year
• More expected beyond 2040 – almost entire area redeveloped by 2100
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Future Development
2007 Satellite-Derived Land Use (UW 2007)
2040 Simulated Land Use (Alberti2009)
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Urban Stream Syndrome
Stressor Symptoms
Hydrology ↑ Peak flows, erosive flows,flashiness
↓ Lag time between peak flows
Physical Habitat
↑ Channel hardening andstraightening, scouring, blockages
↓ channel complexity, native ripariancover
Pollutants ↑ Temperature, bacteria, toxics,nutrients
Biota ↓ Abundance and diversity
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• Inadequate stormwater flow control and
treatment
• Culverts, bridges, other physical changes
• Reduced riparian habitat
Causes of Urban Stream Syndrome
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Stormwater Paradigm
Time Period Paradigm Description
Prior to 1992 Drainage Efficiency
Convey water downhill as efficientlyas possible
1992 – 2013 Reduce NewImpacts
Reduce harm from new construction with flow control and treatment
Future Reduce New and ExistingImpacts
Capture, infiltrate, detain, and treat stormwater everywhere to protect and rehabilitate receiving waters
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King County and USGS
Stream Flow Gages
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Urban Streams are “Flashier”
than Forested Streams
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1/1
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71
1/1
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77
1/2
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95
1/3
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01
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13
De
gre
es
Ce
lsiu
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Newaukum Creek Summer TemperatureJuly/Aug/Sept 1972-2015
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10
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1/1/1978 1/2/1984 1/2/1990 1/3/1996 1/3/2002 1/4/2008 1/4/2014
Feca
l Co
lifo
rm (
cfu
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0m
l)Soos Creek Bacteria 1979-Present
Peak Standard
Geomean Standard
Geomean
90th Percentile
Statistically Significant Declining Trend!
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Copper in King County Streams, with Longfellow Creek Highlight
Longfellow
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Total PCBs in Duwamish River Water at Tukwila 2013-2015 from USGS
0
50
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Baseline Storm Dam Release
Pic
ogr
ams
pe
r Li
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N=5 N=9 N=5
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WRIA 9 Stream
BIBI Scores
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Increased Coho Prespawn Mortality
• Urban stream issue
• Well documented
• Ongoing volunteer monitoring in Miller/Walker
• Due to stormwater runoff
Photo by D. Bobanick, 10/24/2011
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According to Cliff Mass, by the end of the century we are expected to see:
• 11-18% increase in amount of winter rain
• 290% increase in frequency of very large atmospheric rivers
• 15-39% increase in amount of rain during very large atmospheric rivers
King County Stormwater, King County Wastewater, and Ecology are funding a study at UW to assess changes in rainfall patterns and impacts on stormwater designs
9/3/2015
Climate Change: Bigger and More Frequent Large
Storms
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Summary
• Historic development degraded urban streams
• Flow alteration highly variable
• Bacteria levels generally declining
• Temperatures generally warming up
• Copper and PCBs linked to stormwater
• Reduced benthos diversity and abundance
• Coho prespawn mortality in some streams
• Climate change might make things worse
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Questions?