chehalis basin strategy: reducing flood damage and enhancing … · 2014. 5. 9. · chehalis basin...
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Chehalis Basin Strategy: Reducing Flood Damage and Enhancing Aquatic Species
Aquatic Species Enhancement Plan Technical Committee Meeting Olympia, Washington May 7, 2014
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Preliminary Results - Effects of Flood Retention Alternatives on Aquatic Species
• Background information and biological context • Salmon
• Ecosystem Diagnosis & Treatment (EDT) model results
• Shiraz model results • Other fish • Non-fish • Next steps
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Background Information – Selected Species
• 24 key species modeled • Salmon (EDT and Shiraz) – 4 • Other fish – 11 • Non-fish – 7 • Exotics – 2 (three additional species
considered stressors)
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Background Information – Species Status
• ESA-listed species • Eulachon • Bull trout
• State species of concern • Olympic mudminnow
• Petitioned for ESA listing • Oregon spotted frog (August 2014)
5/7/2014
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Background Information – Other Fish and Non-fish Species • Historical and current population information very
limited in Basin. • Olympic mudminnow unique; center of distribution • Chum salmon the exception; geo mean of total run
size since 2003 = 25,116 fish (no clear trend) • Highest species richness of amphibians in Washington
State; also highest at risk in the state • Potential Oregon spotted frog listing • Most extensive floodplain off-channel habitats in
Washington State; occupied by seven species of stillwater-breeding amphibians
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Native Amphibian Species Richness
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Background – Salmon Trends (WDFW Data)
0
20000
40000
60000
80000
100000
120000
1970 1973 1976 1979 1982 1985 1988 1991 1994 1997 2000 2003 2006 2009 2012
Num
ber o
f Ret
urns
Year
Coho ESCCoho TRFall-run Chinook ESCFall-run Chinook TRSpring-run Chinook ESCSpring-run Chinook TRWinter-run Steelhead ESCWinter-run Steelhead TR
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Salmon – Geo Means of WDFW Spawner Index Data (2003–2012)
Species Total Run Escapement Post-harvest
Productivity (R/S)
Spring Chinook Salmon 1,933 1,766 0.9
Fall Chinook Salmon 14,165 11,264 1.0
Coho Salmon 58,567 42,039 1.1
Winter-run Steelhead 9,513 8,346 0.8
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Salmon – Habitat Potential (EDT)
Species Current Intrinsic Habitat
Impairment
Spring Chinook Salmon 4,481 24,754 82%
Fall Chinook Salmon 21,713 44,652 51%
Coho Salmon 27,137 107,769 75%
Winter-run Steelhead 3,640 7,501 51%
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Salmon – VSP Attributes from EDT
Species
Productivity (returns/ spawner)
Capacity (fish)
Equilibrium Abundance
(fish)
Diversity (proportion of successful life
histories) Spring Chinook Salmon
1.8 7,663 4,481 49.1%
Fall Chinook salmon 4.1 28,883 21,713 76.3%
Coho Salmon 4.8 33,277 27,137 71.1%
Winter-run Steelhead 8.6 4,102 3,640 72.8%
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Coho EDT Obstructions
o Partial Passage
• No Passage
o Total Passage
EDT Reaches -- Reach
-- Spawning Reach
- Mainstem Reach
Spring Chinook EDT Obstructions
o P:irtial P:iss;igc
• No Passage
• Complete Passage
EDT Reach
- - Reach
- Sp:iwning Reach
- Mainstem Reach
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Fall Chinook EDT Obstructions
o Partia l Passage
• No Passage
o Total Passage
EDT Reaches
-- Reach
-- Spawning Reach
- Mainstem Reach
Winter Steelhead EDT Obstructions
o Partial Passage
• No Passage
o Total Passage
EDT Reaches
-- Reach
-- Spawning Reach
- Mainstem Reach
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Salmon – Model Results
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Flood Reduction Alternatives – EDT Modeling Assumptions
Scenario Above Dam Dam Passage Below Dam Multi-purpose Inundated reaches
converted to limnetic and littoral habitats juvenile rearing—no spawning
66% adult and juvenile passage
Reduction in bed scour; reduction in temperature; increased flow; reduction in floodplain habitat
FRO 100 100% of inundated reaches converted to migrational habitat no spawning
92% adult and juvenile passage
Lesser reduction in bed scour; temperature unchanged; reduction in floodplain
FRO 50 50% of reaches converted to migrational habitat some spawning
92% adult and juvenile passage
Lesser reduction in bed scour; temperature unchanged; reduction in floodplain
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Basin-wide Effects of Dams (EDT)
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Coho Salmon Sub-population Effects (EDT)
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Fall Chinook Sub-population Effects (EDT)
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Spring Chinook Sub-Population Effects (EDT)
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Winter Steelhead Sub-population Effects (EDT)
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Spatial Changes in Upper Chehalis Coho Performance Under Flood Reduction Alternatives (EDT)
5/7/2014
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Shiraz Model Results (Mainstem Only)
• Evaluated Upper Chehalis Basin stocks: • Spring-run Chinook salmon • Coho salmon • Winter-run steelhead
• Purpose: Assess population responses over time • Trends • Variability • Risk
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Spring-run Chinook Salmon – Flood Retention Only (Shiraz)
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0
500
1,000
1,500
2,000
1990
2000
2010
2020
2030
2040
2050
2060
2070
2080
2090
2100
Num
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f Spa
wne
rs
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ModeledRangeModeledMedian
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Winter-run Steelhead – Flood Retention Only (Shiraz)
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0
1,000
2,000
3,000
4,000
5,000
2000
2010
2020
2030
2040
2050
2060
2070
2080
2090
2100
Num
ber o
f Spa
wne
rs
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ModeledRangeModeledMedian
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Coho Salmon – Flood Retention Only (Shiraz)
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0
500
1,000
1,500
2,000
2,500
3,000
2000
2010
2020
2030
2040
2050
2060
2070
2080
2090
2100
Num
ber o
f Spa
wne
rs
Year
ModeledRangeModeledMedian
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Shiraz Results – Population Risk
• Range in estimated spawners decreased for all three species under dam alternatives
• Spring Chinook: highest estimated spawners under dam alternatives < median number existing conditions
• Winter steelhead: minimum estimated spawners under dam alternatives < minimum estimated under existing conditions (112 fish)
• Coho: Under existing conditions and Flood Retention Only, < 20 fish returned some years
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Shiraz Model Results – Summary
• Response appears to be immediate
• Decreased variability over time
• Increased risk (i.e., lower lows)
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Other Fish and Non-Fish
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Olympic Mudminnow
Redside Shiner
Northern Pikeminnow
Longnose Dace
Largescale Sucker
Sculpin (6 species)
Northern red legged Frog
Western Toad
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Other Fish and Non-fish Methods
• Baseline conditions and flood retention only were considered to be similar during summer (low flow) months when fish are most active; therefore, comparisons were made only with the multi-purpose facility
• In-channel habitat – PHABSIM was used to establish baseline conditions of weighted usable area (WUA)
• Off-channel habitat – correlatives were used to quantify the amount of off-channel habitat under both scenarios
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Other Fish and Non-Fish In-channel Habitat – Baseline
• Flows are more limiting in the upper basin than the lower basin
• Low flows during summer months appears to be a limiting factor for many species
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In-channel Habitat Results Discussion
• Changes in flow resulted in both increases and decreases in WUA, depending on species and life stage
• Generally, rearing decreased for all species except whitefish, likely due to increased flows during summer months
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Off-channel Habitat
• Looked at 2, 10, 20, 100, and 500 year flood events
• Compared inundated area (at least 0.1 foot) of baseline to dam
• 3 figures • Baseline inundation • Absolute change in inundation with dam • Relative (%) change in inundation with dam
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0
3000
6000
9000
Inun
date
d Ar
ea (i
n ac
res)
500-year
100-year
20-year
10-year
2-year
River Segment
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-1000
-800
-600
-400
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0
200
Abso
lute
Cha
nge
(in a
cres
inun
date
d)
500-year
100-year
20-year
10-year
2-year
River Segment
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2-year Flood Event
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-100
-80
-60
-40
-20
0
Perc
ent C
hang
e 500-year
100-year
20-year
10-year
2-year
River Segment
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Off-channel Habitat Discussion
• Area of inundation generally increased closer to the mouth
• For 500, 100, and 20 year the reach with the greatest reduction in inundation was from the dam site to Elk Creek
• Inundation index generally decreases further downstream from the dam
• Dam effects are negligible for a 2 year flood
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Summary – Salmon (EDT)
• Largest impact on spring-run Chinook and winter-run steelhead (basin scale)
• Largest change in abundance on Upper Chehalis sub-populations • Spring Chinook: 100% with FRO100 scenario; 70% with FRO50
scenario • Winter steelhead: 62% with FRO100 and FRO50 • Coho: 62% with FRO100 scenario; 36% with FRO50 scenario
• Some positive effects on middle-to-lower river populations (fall-run Chinook, Winter-run steelhead and coho)
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Summary – Salmon (EDT and Shiraz)
• General pattern between dam alternatives (EDT): Impacts from FRO100 > FRO50 > Multi-purpose alternative
• Temporal trends (preliminary)(Shiraz):
• Response appears to be immediate
• Decreased population variability over time
• Stocks exposed to increased risk (i.e., lower lows)
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Summary – Other Fish and Non- Fish In-channel Habitat • Response varied with species thermal preferences
(adaptations), life stage, location (reach) • In general
• Warm adapted species impacted by releases from multi-purpose dam • Cool adapted species benefit from releases from multi-purpose dam
• Low flows during summer months appear to be a limiting factor
• Increased summer flows may have a positive effect on some species
• Much more data is needed to determine in-channel effects on Other Fish and Non-Fish species
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Summary – Other Fish and Non-Fish Off-channel Habitat
• Increase in inundation would have a positive effect and a decrease in inundation would have a negative effect on the off channel suite of species • Pacific lamprey juveniles, Olympic mudminnow, speckled dace,
largescale sucker juveniles, riffle sculpin, reticulate sculpin and largemouth bass
• Coastal tailed frog, Northern red-legged frog, Oregon spotted frog, Western pond turtle, North American Beaver
• Much more data is needed to determine off-channel effects on Other Fish and Non-Fish species
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Next Steps
• EDT adjustments: • Incorporate WDFW mainstem habitat data
• Incorporate tributary water temperature monitoring data
• Complete EDT analyses of climate change scenarios with dams
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Next Steps
• Shiraz runs • Habitat degradation over time
• EDT and Shiraz: • Model iterations and discuss assumptions
• Other fish – no additional analyses • Non-fish – no additional analyses • Address technical review comments
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Extra Slides
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Fish-passage Survival Assumptions
SPECIES AND LIFE STAGE MULTI-PURPOSE FRO
Coho Adults 73.6% 88.2%
Coho Juveniles Upstream 61.8% 93.1%
Coho Juveniles Downstream 61.8% 93.1%
Fall Chinook Adults 73.6% 88.2%
Fall Chinook Juveniles Upstream 61.8% 93.1%
Fall Chinook Juveniles Downstream 61.8% 93.1%
Spring Chinook Adults 73.6% 88.2%
Spring Chinook Juveniles Upstream 61.8% 93.1%
Spring Chinook Juveniles Downstream 61.8% 93.1%
Steelhead Adults 73.6% 88.2%
Steelhead Juveniles Upstream 61.8% 93.1%
Steelhead Juveniles Downstream 61.8% 93.1% 5/7/2014
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500-year Flood Event
SEGMENT 500-YEAR PERCENT CHANGE NO DAM DAM
Dam to Elk Creek 432 180 58 Elk Creek to SF Chehalis 1999 1442 28 SF Chehalis to Newaukum River 5032 4836 4 Newaukum River to Skookumchuck River 3114 3057 2
Skookumchuck River to Scatter Creek 5592 5393 4
Scatter Creek to Black River 4003 3938 2 Black River to Porter Creek 6432 6309 2 Porter Creek to Satsop River 7771 7662 1 Satsop River to Wynoochee River 5005 4953 1 Wynoochee to HW 101 Bridge 8206 8066 2
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100-year Flood Event
SEGMENT 100-YEAR PERCENT
CHANGE NO DAM DAM Dam to Elk Creek 340 167 51 Elk Creek to SF Chehalis 1692 905 47 SF Chehalis to Newaukum River 4796 4219 12 Newaukum River to Skookumchuck River 2997 2725 9 Skookumchuck River to Scatter Creek 5224 4930 6 Scatter Creek to Black River 3870 3783 2 Black River to Porter Creek 6183 6055 2 Porter Creek to Satsop River 7528 7364 2 Satsop River to Wynoochee River 4871 4818 1 Wynoochee to HW 101 Bridge 7844 7643 3
5/7/2014
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20-year Flood Event
SEGMENT 20-YEAR PERCENT
CHANGE NO DAM DAM Dam to Elk Creek 250 156 38 Elk Creek to SF Chehalis 1195 499 8 SF Chehalis to Newaukum River 3855 2880 2 Newaukum River to Skookumchuck River 2458 2332 4 Skookumchuck River to Scatter Creek 4499 4007 2 Scatter Creek to Black River 3636 3539 3 Black River to Porter Creek 5877 5778 2 Porter Creek to Satsop River 7112 6992 1 Satsop River to Wynoochee River 4709 4672 2 Wynoochee to HW 101 Bridge 7089 6829 1
5/7/2014
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10-year Flood Event
SEGMENT 10-YEAR PERCENT CHANGE
NO DAM DAM
Dam to Elk Creek 204 155 24
Elk Creek to SF Chehalis 892 354 60
SF Chehalis to Newaukum River 3153 2275 28
Newaukum River to Skookumchuck River 2362 2104 11
Skookumchuck River to Scatter Creek 4021 3616 10
Scatter Creek to Black River 3521 3414 3
Black River to Porter Creek 5756 5614 2
Porter Creek to Satsop River 6941 6838 1
Satsop River to Wynoochee River 4647 4623 1
Wynoochee to HW 101 Bridge 6653 6474 3 5/7/2014
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2-year Flood Event
SEGMENT 2-YEAR PERCENT
CHANGE NO DAM DAM Dam to Elk Creek 149 149 0 Elk Creek to SF Chehalis 296 297 0 SF Chehalis to Newaukum River 1571 1574 0 Newaukum River to Skookumchuck River 1407 1409 0 Skookumchuck River to Scatter Creek 2659 2660 0 Scatter Creek to Black River 2983 2984 0 Black River to Porter Creek 4762 4763 0 Porter Creek to Satsop River 6352 6352 0 Satsop River to Wynoochee River 4506 4506 0 Wynoochee to HW 101 Bridge 5536 5536 0
5/7/2014